Alternatives to onsemi MMBT3904
onsemi MMBT3904 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 MMBT3904onsemi |  MMBT3904LT1Gonsemi |  MMBT3904-7-FDiodes Incorporated | +4more | |
|---|---|---|---|---|
| FFF Compatibility | Identical SOT-23 footprint and standard pin configuration (1-Base, 2-Emitter, 3-Collector) as the original part.Perfectly matches the package dimensions and surface-mount package style.Meets or exceeds all electrical parameters including 40 V breakdown voltage, 200 mA collector current, and 300 MHz transition frequency. | Standard SOT-23 footprint and matching JEDEC 3-pin configuration.Interchangeable standard SOT-23 package body style and physical lead pitch.All critical specifications such as breakdown voltage, collector current, and gain match or exceed the original part. | ||
 AI Summary | MMBT3904 by onsemi: Bipolar (BJT) Transistor NPN 40 V 200 mA 300MHz 200 mW Surface Mount SOT-23. | This is the premier active replacement from onsemi. It is widely stocked and provides a slightly higher power dissipation rating, making it an excellent, long-lived choice for obsolete Good-Ark designs.
| Diodes Incorporated offers an active, industry-standard MMBT3904 variant that seamlessly drops onto existing SOT-23 footprints. This part is a highly reliable direct second-source.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Bipolar (BJT) Transistor NPN 40 V 200 mA 300MHz 200 mW Surface Mount SOT-23 | Bipolar (BJT) Transistor NPN 40 V 200 mA 300MHz 300 mW Surface Mount SOT-23-3 (TO-236) | Bipolar (BJT) Transistor NPN 40 V 200 mA 300MHz 300 mW Surface Mount SOT-23-3 | |
| Manufacturer | onsemi | onsemi | Diodes Incorporated | |
| Type | Transistors | Transistors | Transistors | |
| Datasheet | Open | Open | Open | |
| Lead Time | 16 weeks | 59 weeks | 44 weeks | |
| Country of Origin | PH | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.21.0075 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Power - Max | 350.0mW | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Package / Case | SOT-23 | - | - | |
| Transistor Type | NPN | - | - | |
| Frequency - Transition | 300.0MHz | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 MMBT100Aonsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| MMBT2907ALT1onsemi | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
 2N3904onsemi | Non-stock | Obsolete | 5Alternatives availableSee Alternatives |
 LM2904Monsemi | In stock | Obsolete | 3Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi MMBT3904 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 MMBT3904 are the MMBT3904LT1G (onsemi) and the MMBT3904-7-F (Diodes Incorporated), out of 6 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Yes. The leading alternatives to the MMBT3904 are fit-, form- and function-compatible — the same package and pinout with matching key electrical specifications — so they drop in without PCB changes. Always confirm the parameters critical to your design against the alternative's datasheet before committing.
The MMBT3904 (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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