Alternatives to onsemi MMBT3904LT1
onsemi MMBT3904LT1 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 MMBT3904LT1
| MMBT3904LT1onsemi |  MMBT3904LT1Gonsemi |  MMBT3904-7-FDiodes Incorporated | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Uses the exact same SOT-23-3 (TO-236AB) footprint with identical pin assignments.Matches physical dimensions and SMD mounting style.Identical electrical specifications across voltage, current, power dissipation, and transition frequency. | Standard SOT-23-3 package with the identical pin layout (1: Base, 2: Emitter, 3: Collector).Matches the physical case outline and mounting parameters perfectly.Meets or exceeds all critical maximum ratings and electrical performance specifications. | ||
 AI Summary | MMBT3904LT1 by onsemi: Bipolar Transistors - BJT NPN GENERAL PURPOSE. | This is the direct Pb-free, RoHS-compliant active replacement from the original manufacturer (onsemi). It serves as a true drop-in equivalent with identical physical and electrical specifications.
| An active, industry-standard alternative from Diodes Incorporated. It is fully pin-to-pin compatible and perfectly matches the original electrical and thermal baselines.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | Unknown | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| ——— ———— | ————— ——— ———— | ———— —————— | —— ————— ——— | |
| —————— —— | ——————— ———— | ————— ——— ———— | ———— —————— | |
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| ———— ——— | —— ————— ——— | ——————— ———— | ————— ——— ———— | |
| —— ————— | ———— —————— | —— ————— ——— | ——————— ———— |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 MMBT3904onsemi | In stock | Obsolete | 6Alternatives availableSee Alternatives |
| MMBT2907ALT1onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
 MMBD914LT1onsemi | Discontinued | Obsolete | 8Alternatives availableSee Alternatives |
 MBT3904DW1T1Gonsemi | In stock | Active | 5Alternatives availableSee Alternatives |
 MMBT3640onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| BAT54LT1onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi MMBT3904LT1 is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the onsemi MMBT3904LT1 are the MMBT3904LT1G (onsemi) and the MMBT3904-7-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.
Not always. The alternatives to the MMBT3904LT1 are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The MMBT3904LT1 (onsemi) is a part in the Bipolar Transistors - BJT category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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