MMBT3904WT1G

What is MMBT3904WT1G?

MMBT3904WT1G is an NPN bipolar junction transistor (BJT) designed by onsemi for high-speed switching and general-purpose amplification. It is particularly favored for compact surface-mount applications using the SC-70 / SOT-323 package. This transistor supports up to 200 mA collector current, operates at up to 40V collector-emitter breakdown voltage, and has a transition frequency of 300 MHz — making it ideal for small signal RF circuits, digital logic level shifting, and general amplification tasks.

MMBT3904WT1G Key Specifications

Package Information

The MMBT3904WT1G is offered in a compact SC-70 / SOT-323 package, suitable for high-density PCB layouts. Its small footprint and thermal performance make it a preferred choice in portable electronics, mobile devices, and compact embedded systems.

Cross Reference & Alternatives

• 2N3904 (through-hole version)
• MMBT3904 (SOT-23 version)
• BC847B (similar specs, different gain group)
• PMBT3904WT (Nexperia equivalent in SC-70)

Performance Insight

Vce(sat) of 300mV ensures minimal voltage loss during saturation, which is important in switching applications. The transition frequency of 300MHz makes it usable in low-power RF circuits and high-speed digital drivers. With a minimum gain of 100 at low collector current, it balances signal amplification and efficiency.

Applications

• Signal amplification
• Switching loads in embedded systems
• RF driver circuits
• Digital level shifting
• Pulse and waveform shaping

Buying Guide & Packaging Options

This part is offered in multiple packaging formats:

• Tape & Reel (TR)
• Cut Tape (CT)
• Digi-Reel®

Always verify packaging and lot codes from your distributor. For industrial use, ensure compliance with RoHS and temperature ratings.