Alternatives to onsemi BSS138
onsemi BSS138 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
Equivalent and substitute parts for onsemi BSS138
 BSS138onsemi |  BSS138onsemi |  BSS138-7-FDiodes Incorporated | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Matches the SOT-23 package and pinout exactly (Pin 1: Gate, Pin 2: Source, Pin 3: Drain) with no layout changes needed.Identical SOT-23-3 package dimensions and mounting style.Matches all key electrical parameters including 50V breakdown voltage, 220mA drain current, and 3.5 Ohm RDS(on) at 10V. | Uses the standard SOT-23-3 footprint and identical pin assignment (G-S-D).Standard SOT-23 package with identical mechanical dimensions.The continuous drain current is slightly lower at 200mA compared to the original 220mA. | ||
 AI Summary | BSS138 by onsemi: N-Channel 50 V 220mA (Tj) 430mW Surface Mount SOT-23. | The onsemi BSS138 is the most prominent industry-standard equivalent, serving as a true drop-in replacement with identical electrical characteristics, physical dimensions, and pinout assignments.
| Diodes Inc.'s BSS138-7-F is an excellent drop-in option that mirrors almost all characteristics, though it has a slightly lower continuous current rating of 200mA instead of 220mA.
| |
| Lifecycle Status | Active | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 BSS138_NLonsemi | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 BSS138TADiodes Incorporated | In stock | NRND | 5Alternatives availableSee Alternatives |
 BSS138LT1onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| BSS84Diodes Incorporated | Non-stock | Active | 6Alternatives availableSee Alternatives |
 SN74LS138NTexas Instruments | In stock | Active | 5Alternatives availableSee Alternatives |
| BSS84_NLonsemi | Discontinued | Obsolete | 8Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi BSS138 is active and in production. The parts listed here are qualified equivalents if you need a second source or better availability.
The closest qualified second sources for the onsemi BSS138 are the BSS138 (onsemi) and the BSS138-7-F (Diodes Incorporated), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Partly. Some alternatives to the BSS138 are full fit-, form- and function-compatible drop-ins, while others match on function but differ in package or a key parameter. Check the fit/form/function notes in the table and the datasheet for your application before swapping.
The BSS138 (onsemi) is a part in the Transistors category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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