NPN general purpose bipolar junction transistor in SOT-23 package, designed for linear amplification and high-speed switching applications.
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MMBT3904LT3G
SOT-23-3 (TO-236, 2.90 x 1.30 x 1.00 mm)
The MMBT3904LT3G is a general purpose NPN silicon bipolar junction transistor designed for use in linear and switching applications. Housed in the SOT-23 (TO-236) surface-mount package, it features a collector-emitter voltage of 40 V, collector current of 200 mA, DC current gain of 100 to 300, and a transition frequency of 300 MHz. The device is Pb-free, halogen-free/BFR-free, and RoHS compliant. Supplied on a 10,000-piece tape and reel.
The MMBT3904LT3G is a general purpose NPN silicon bipolar junction transistor from onsemi in SOT-23 package, featuring 40V VCEO, 200mA IC, 300MHz fT, hFE 100-300, and 300mW power dissipation. Pb-free, halogen-free, RoHS compliant. Designed for linear and switching applications.
The MMBT3904LT3G operates as an NPN bipolar junction transistor consisting of a thin P-type base region sandwiched between two N-type semiconductor layers (emitter and collector). When a small forward bias current is applied to the base-emitter junction, it modulates the flow of majority carriers (electrons) from emitter through the base to the collector, producing a much larger collector current. The ratio of collector current to base current defines the DC current gain (hFE), which ranges from 100 to 300 at IC=10mA. The transition frequency of 300 MHz indicates the frequency at which the common-emitter current gain drops to unity. The low collector-emitter saturation voltage (0.2V at 10mA, 0.3V at 50mA) enables efficient switching operation with minimal power loss. Fast switching characteristics (turn-on 35ns, turn-off 50ns) make it suitable for high-speed digital and pulse applications.
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | Base | Control terminal; a small input current modulates the collector-emitter conduction |
| 2 | Emitter | Current source terminal; electrons are emitted from this region into the base |
| 3 | Collector | Current sink terminal; collects electrons that pass through the base region from the emitter |
| Application | Description |
|---|---|
| Switching Circuits | Digital logic switching, relay drivers and power control with fast turn-on/turn-off times (35ns/50ns) |
| LED Drivers | Low-power LED switching and current control in indicator and display circuits |
| Signal Amplification | Small-signal audio and RF amplification leveraging high hFE (100-300) and 300MHz bandwidth |
| Logic Level Translation | Interface between different voltage domains in mixed-signal systems |
| Pulse Generators | Timing and pulse-shaping circuits using fast switching characteristics |
| Current Sources | Precision current mirror and constant current circuits using matched hFE characteristics |
| Load Drivers | Driving small relays, solenoids and buzzers up to 200mA collector current |
| Sensor Interface | Signal conditioning and amplification for temperature, light and other sensor outputs |
| Model | Manufacturer | Package | Key Difference |
|---|---|---|---|
| MMBT3904LT1G | onsemi | SOT-23-3 | Same die, 3,000-piece reel (vs. 10,000-piece for LT3G) |
| SMMBT3904LT1G | onsemi | SOT-23-3 | AEC-Q101 qualified automotive version, 3,000-piece reel |
| MMBT3904-7-F | Diodes Inc. | SOT-23-3 | Functionally equivalent, different manufacturer |
| PMBT3904,215 | Nexperia | SOT-23 (TO-236AB) | Pin-compatible, Nexperia-branded equivalent |
| BC847C | Nexperia | SOT-23-3 | Higher VCEO (45V), lower IC (100mA), higher hFE selection available |
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.
All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.
Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.
All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.
Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.
