Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsRead a ceramic capacitor’s temperature code as a stability classification, not as its complete specification. For a common Class II code such as X7R, the first character gives the minimum temperature, the number gives the maximum temperature, and the final character gives the allowed capacitance change across that range. Class I parts such as C0G use a different convention: a temperature coefficient in parts per million per degree Celsius (ppm/°C). Neither code tells you the capacitor’s initial capacitance tolerance, DC-bias derating, aging, rated voltage, or suitability as a replacement. Those facts come from the complete ordering code and the manufacturer’s datasheet.
This guide shows how to decode the common markings, distinguish Class I from Class II, and verify an actual part before designing it in or substituting it.
As an Amazon Associate I earn from qualifying purchases.
What the temperature code actually describes
A ceramic capacitor’s temperature characteristic describes how its capacitance is permitted to change as temperature moves through a specified operating range. It is measured relative to a reference capacitance under defined test conditions. The code does not promise that the capacitor is exactly at its nominal value in a circuit, nor does it describe every electrical stress the part may experience.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →That distinction matters because multilayer ceramic capacitors (MLCCs) can also change with applied DC voltage, AC test level, frequency, mechanical stress, aging, package size and construction. A part marked X7R can meet its temperature classification while delivering substantially less effective capacitance when biased. Analog Devices summarizes the practical implication this way: “Engineers must check the data to know, really know, how a specific capacitor will perform under voltage.” See its discussion of temperature and voltage variation in ceramic capacitors.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
How to decode a Class II EIA code
In the common three-character Class II EIA system, the positions have fixed jobs. TDK describes the pattern as follows: the first letter determines the lowest operating temperature, the number determines the upper operating temperature, and the final letter determines the maximum capacitance change anywhere in that range. The code is a compact classification, not a complete part number.
| Code | Lowest temperature | Highest temperature | Permitted capacitance change across the range |
|---|---|---|---|
| X7R | −55 °C | +125 °C | ±15% |
| X5R | −55 °C | +85 °C | ±15% |
| Y5V | −30 °C | +85 °C | +22% / −82% |
For example, decode X7R from left to right:
- X selects the −55 °C lower-temperature category.
- 7 selects the +125 °C upper-temperature category.
- R allows a maximum change of ±15% relative to the reference capacitance over that span.
The same process yields the X5R and Y5V limits in the table. TDK also lists less familiar combinations, including X8R and Z5U. Do not infer an unfamiliar code by analogy; confirm it against the applicable standard and the exact manufacturer datasheet. The TDK Product Center temperature-characteristic FAQ is a useful reference for the code positions.
What “±15%” means
The percentage is the allowed change caused by temperature relative to a specified reference capacitance. It is not the production tolerance printed on the purchase order. A nominal 1 µF X7R part can have an initial tolerance specified separately, and its in-circuit capacitance can be lower still when DC bias is applied. The temperature classification only limits the temperature-related portion under the stated test conditions.
Why Y5V needs extra caution
The asymmetric +22%/−82% limit means the capacitance may fall dramatically at one end of the rated temperature range. Such a classification can be acceptable where large nominal capacitance is more important than tight stability, but it is a poor assumption for timing, filtering or precision analog functions unless the full operating range has been modeled and measured.
Class I notation is a different code system
Class I temperature-compensating ceramics are specified with a coefficient in ppm/°C rather than the Class II low-temperature/high-temperature/change format. A three-character EIA Class I code represents the coefficient’s significant figure, multiplier and tolerance. C0G is a common designation and is also associated with NP0 terminology.
The symbols in a Class I code must be read using the relevant EIA table or the manufacturer’s data sheet; do not apply the X7R position rules to C0G. KYOCERA AVX explains the Class I notation and the relationship between coefficient and tolerance in its technical note, Variability and Tolerance of Ceramic Capacitors.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Interpreting a ppm/°C specification
A coefficient of ±30 ppm/°C means the capacitance’s temperature slope is limited to 30 parts per million for each degree Celsius in either direction, within the rated range and test conditions. TDK uses ±30 ppm/°C in its general C0G/NP0 explanation. If that limit were applied arithmetically over a 180 °C span from −55 °C to +125 °C, the worst-case change represented by the coefficient would be about 0.54% (30 × 180 parts per million). The actual curve, reference temperature and tolerance of a specific part still come from its datasheet.
Free tools Windows power users keep installed
One-click scans. No signup required.
C0G and NP0 range warnings
C0G is commonly specified from −55 °C to +125 °C. TDK describes its NP0 range as extending to +150 °C, but that is a TDK-specific distinction, not a universal rule for every manufacturer’s C0G- or NP0-labeled part. Verify the rated range for the exact series and voltage rating before using the name as a temperature guarantee. TDK’s explanation of Class I versus Class II capacitors provides additional context.
Temperature characteristic is not initial tolerance
Two separate specifications are often confused:
- Temperature characteristic: how capacitance is allowed to move as temperature changes.
- Initial capacitance tolerance: how far the measured value may be from the nominal value at the reference test condition when the part is manufactured.
A code such as X7R or C0G does not tell you the initial tolerance. The complete ordering code normally identifies nominal capacitance, tolerance, voltage rating, case size, termination and other construction details. Read those fields and the datasheet test conditions rather than treating the three-character temperature code as a full part number.
Temperature code is not a DC-bias specification
Class II dielectrics can lose effective capacitance as DC voltage increases. The loss depends on the dielectric formulation, nominal value, package size, rated voltage, applied voltage and temperature. An Analog Devices example shows a nominal 4.7 µF X7R capacitor whose effective capacitance becomes much lower under the cited bias conditions. Those figures illustrate one component and circuit context; they are not a universal percentage for every 4.7 µF X7R part.
When a capacitor is used on a power rail, read the manufacturer’s capacitance-versus-voltage curve at the actual bias, temperature and frequency. If the circuit requires a minimum capacitance, choose the nominal value and voltage rating from that effective-capacitance requirement, not from the marking alone.
Recommended Free Tools
Class I and Class II: choosing between the families
| Decision factor | Class I (for example, C0G/NP0) | Class II (for example, X7R, X5R, Y5V) |
|---|---|---|
| Temperature notation | Coefficient in ppm/°C, encoded by a Class I three-character scheme | Low-temperature letter, high-temperature number and change-limit letter |
| Typical stability priority | Very stable capacitance and low temperature dependence | Higher capacitance in a compact package, with greater dependence on operating conditions |
| DC-bias sensitivity | Usually much lower, but still verify the exact part | Can be substantial; use the capacitance-versus-voltage data |
| What the code omits | Initial tolerance, voltage rating, package, aging and test conditions | Initial tolerance, voltage-bias behavior, package, aging and test conditions |
| Best starting point | Oscillators, filters, references, timing and other stability-critical nodes | Decoupling, bulk bypassing and general signal coupling when effective capacitance is verified |
These are selection tendencies, not automatic suitability rules. A Class I part can be the wrong voltage, package or capacitance for a circuit, and a Class II part can be entirely adequate when its effective value and drift fit the design limits.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
A reliable workflow for identifying an unknown capacitor
1. Find the complete identity
Start with the bill of materials, assembly drawing, reel label, purchase record or board-design database. Tiny surface-mount MLCCs often have no readable marking at all. A visual inspection may identify the case size but not the dielectric, tolerance or voltage rating. The manufacturer’s full part number is more reliable than the color or dimensions.
2. Locate the dielectric and temperature field
In the part number or datasheet, look for a field such as C0G, NP0, X7R, X5R or Y5V. Confirm that the field is a dielectric/temperature characteristic and not a package, termination or reliability suffix. If the notation is unfamiliar, use the manufacturer’s code key instead of guessing from the letters.
3. Decode the temperature limits
For a Class II code, translate the first two positions into the lower and upper temperatures and the last position into the permitted change. Record the complete range in your design notes. For a Class I code, record the ppm/°C coefficient and the rated temperature range shown on the datasheet.
4. Record nominal value and initial tolerance separately
Write down the capacitance in farads, the production tolerance and the reference test conditions. Do not substitute the temperature-change percentage for this tolerance. A circuit that needs a minimum or maximum capacitance must account for both manufacturing spread and environmental change.
5. Check effective capacitance at bias
For any Class II part connected to a DC potential, find the manufacturer’s capacitance-versus-voltage graph or table. Check the curve at the worst-case voltage, temperature and frequency. If no curve is provided for the exact part, treat the available value as uncertain rather than borrowing a graph from a different case size or voltage rating.
6. Verify package, voltage and construction
Case size affects mechanical stress and electrical behavior. Confirm the rated voltage, dielectric, termination system, temperature range and any automotive, high-reliability or flex-crack requirements. A code family is not an exact replacement recommendation.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
7. Include aging and environmental effects
Read the datasheet’s aging, humidity, mechanical-stress and reflow guidance. Class I and Class II families can have different aging behavior, and board bending can change or damage a ceramic part even when its temperature code is appropriate. Keep the manufacturer’s qualification limits with the component record.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →How to use a datasheet without misreading the numbers
Check the heading of every graph and table. A capacitance value may be measured at a particular frequency, AC amplitude, room temperature and zero DC bias. A temperature plot may use a reference capacitance that is not the nominal value printed in the ordering code. A voltage plot may show normalized capacitance rather than capacitance in microfarads.
- Confirm whether percentages are relative to nominal, room-temperature measured capacitance or another reference.
- Check whether the temperature range is an operating limit, a test range or both.
- Read the voltage rating and derating instructions; a temperature code does not encode voltage withstand.
- Use the curve for the exact capacitance, case size, dielectric and rated voltage whenever available.
- Note whether the listed tolerance is guaranteed at delivery, after mounting, or only under a specified measurement method.
Murata’s explanation of temperature characteristics of ceramic capacitors is a useful reminder that capacitance is an electrical measurement made under stated conditions, not a permanent identity label that a meter can decode.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes and how to correct them
Assuming X7R means “7%”
The number 7 is a temperature-category code, not a seven-percent tolerance. Read all three positions together and obtain the initial tolerance from the ordering code.
Assuming X5R and X7R are interchangeable
They have different upper-temperature classifications. A design qualified only to +85 °C cannot automatically use a part selected for a +125 °C requirement, and a lower-temperature part may not satisfy the system’s environmental limit.
Using a Y5V part because its nominal capacitance matches
Nominal capacitance alone does not establish usable capacitance across temperature and bias. Check the permitted temperature change and effective-capacitance data before accepting the substitution.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Replacing C0G with any part described as “stable”
“Stable” is not a standardized substitute for the coefficient, tolerance, voltage rating and temperature range. Compare the actual ppm/°C, initial tolerance and operating limits.
Measuring a part and inferring its code
An LCR or capacitance meter reports capacitance under its own frequency, signal level and bias conditions. It does not identify whether an unmarked part is X7R, C0G or another dielectric. Use measurement to check a known part or investigate a circuit, not to invent the missing ordering information.
Trusting a visible marking on a tiny MLCC
Many small surface-mount parts are unmarked, and any printed code may identify only a manufacturer series or value. Trace the part through the assembly documentation and verify the data sheet.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThree practical selection examples
Precision timing network
Start with a Class I candidate such as C0G, then verify the ppm/°C coefficient, initial tolerance, voltage coefficient, frequency behavior and rated range. If the timing error budget is tighter than the coefficient allows, calculate the drift over the actual temperature span and select a part with the required margin.
Power-rail decoupling
A Class II part may provide the needed nominal capacitance in a small package. Determine the minimum effective capacitance at the rail’s DC voltage, ripple conditions and temperature. Select the nominal value, case size and voltage rating from that requirement, then confirm the manufacturer’s bias curve.
Equipment exposed to a wide ambient range
First compare the system’s minimum and maximum temperatures with the capacitor’s rated range. Then combine the temperature-change limit, initial tolerance, DC-bias loss and aging. If the resulting worst-case capacitance misses the circuit limit, change the dielectric, nominal value, voltage rating or package rather than relying on the temperature code alone.
A compact verification checklist
- Identify the exact manufacturer part number.
- Determine whether the dielectric is Class I or Class II.
- For Class II, decode low temperature, high temperature and maximum change.
- For Class I, record the ppm/°C coefficient and tolerance notation.
- Record nominal capacitance and initial tolerance as separate fields.
- Check rated voltage and effective capacitance under the circuit’s DC bias.
- Verify frequency, AC test level, temperature, package and mounting conditions used by the data.
- Review aging, mechanical-stress and environmental limits.
- Confirm that a proposed replacement matches the complete electrical and mechanical requirements.
Bottom line
Use X7R, X5R and Y5V as Class II temperature classifications: the letter, number and final letter describe temperature limits and permitted capacitance change. Use C0G/NP0 as a Class I coefficient designation expressed in ppm/°C. In both cases, stop decoding at the temperature characteristic and then open the exact datasheet. Initial tolerance, DC-bias derating, voltage rating, aging, package and construction determine whether the capacitor will actually work in your circuit.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
