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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →A small outline J-lead package (SOJ) is a surface-mount integrated-circuit package with leads on two opposite sides. Each lead leaves the side of the body and curls underneath it in a “J” shape, so the solder contact sits under the package edge instead of on an outward-pointing gull wing. “SOJ” names a family of outlines, not a single footprint, so always check the exact component drawing and board land pattern.
What the name means
“Small Outline J-Lead” is abbreviated SOJ. Some sources also write SOIJ or “J-leaded small outline IC.” EE Semi and MADPCB describe it as a small rectangular, plastic-molded surface-mount package. Its defining geometry is two rows of leads on opposite sides, with the lead ends folded beneath the body.
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The IEC 61188-5-4:2007 land-pattern standard, read through an ITEH catalog excerpt, puts it this way: “The small-outline J (SOJ) package has leads on two sides, similar to a DIP.” The same standard treats the contact region at the underside bend as the basis for the land-pattern span. When you read a footprint drawing, the electrical contact is at that bend, not at the outer edge of the body.
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SOJ is surface mount, not through-hole
Like a DIP, an SOJ has two opposing rows of leads. Unlike a DIP, its contacts solder to pads on the board surface. A UCSB electrical and computer engineering reference also notes that SOJ packages have been used in sockets where a ROM or flash chip had to be removable for programming. That is an application example, not a promise that any socket fits any SOJ part.
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- 💡 MULTI-BULB CONTROL: 3-terminal, 2-circuit design for controlling two separate light bulbs or sets of bulbs.
- 🏠 VERSATILE USE: Ideal for fixtures with multiple bulbs that need separate control.
- 🔌 MEDIUM/STANDARD BULB SIZE: Compatible with medium or standard size bulbs.
- 🔧 EASY REPLACEMENT: Designed to replace existing lamp socket interiors.
- 💪 DURABLE CONSTRUCTION: Constructed from high-quality materials for dependable performance.
Dimensions and identification
Published figures show the family varies:
| Attribute | Documented value | Source |
|---|---|---|
| Nominal lead pitch | 1.27 mm (0.050 in) | EE Semi; Intel 1999 Packaging Databook; IEC 61188-5-4:2007 |
| Common body widths | 7.5 mm (300 mil) and 10.2 mm (400 mil) | EE Semi (publication date not stated) |
| Example lead counts | 16 to 40 | EE Semi |
| Body-size classes | SOJ/300, SOJ/350, SOJ/400, SOJ/450 | IEC 61188-5-4:2007 excerpt |
These are package-reference values, not a substitute for a manufacturer’s drawing. To identify a device, compare the package code, body length and width, total lead count, pitch, overall lead span and the recommended land pattern. Do not infer compatibility from the word “SOJ” alone.
SOJ versus SOIC
Both are small-outline, two-sided surface-mount packages. The difference is the lead form: SOIC has gull-wing leads that project outward, while SOJ leads tuck under the body. The contact surfaces differ, so an SOIC footprint should not be assumed to fit an SOJ part.
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- Medium Base Complete Socket.
- Two circuit system controls another socket wired onto the third terminal.
- Aluminum Shell Incandescent Lampholder bright gold finish
- 1/8 IPS Tapped Bushing on bottom cap.
- Not the same as a 3-way socket, this socket is for controlling 2 light bulbs with one socket.
| Feature | SOJ | SOIC |
|---|---|---|
| Lead direction | J-shaped, folds under the body | Gull wing, projects outward |
| Contact point | Beneath the package edge, at the J bend | Outward lead feet |
| Footprint advice | Use the exact SOJ drawing and land pattern | Do not reuse for SOJ |
What SOJ packages are used for
Package references generally associate SOJ with memory devices. Such an association does not make memory parts interchangeable: a matching package outline says nothing about electrical compatibility, so confirm the part number, pin count, dimensions, pitch and electrical specifications.
How common is it today?
A package overview by Geoffrey Hunter (published 2015, updated 2024-12-13) calls SOJ uncommon among current surface-mount packages. That is a qualitative statement from a secondary source, not a market-share figure, and it does not show that no suppliers exist. No source consulted establishes present-day stock, so anyone repairing or reproducing legacy hardware should check distributor inventory for the exact part number.
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