MMBT3904LT1G.pdf
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MMBT3904LT1G is one of the most popular NPN SMD transistors, often used together with MMBT3906LT1G as a complementary pair in push-pull and driver stages.
As a NPN BJT, it amplifies base current to control collector current, allowing it to act as a linear amplifier or saturated switch. It is suited for logic-level control, analog pre-amplification and discrete driver functions.
The device supports typical small-signal collector currents and provides a stable hFE over a wide portion of its operating range. Low VCE(sat) improves efficiency when used as a switch in low-voltage systems such as 3.3 V or 5 V logic rails.
MMBT3904LT1G offers fast rise and fall times, making it suitable for clock circuits, digital level shifting, MOSFET gate drive pre-stages and pulse-width-modulated control signals where timing precision is important.
onsemi ensures tight process control, which results in predictable transistor behaviour across units. When mounted on a properly designed PCB layout, the SOT-23 package provides adequate thermal handling for typical small-signal power levels encountered in low-power designs.
The SOT-23 package minimizes board space while enabling automated SMT assembly. Short lead lengths reduce parasitic inductances and capacitances, improving performance for both analog and digital high-speed circuits.
Used in logic inverters, LED drivers, small relay drivers, audio pre-stages, sensor interfaces, oscillator and timing circuits, and many other general-purpose switching or amplification roles.
| Transistor Type | NPN Small-Signal BJT |
|---|---|
| Package | SOT-23, SMT |
| Typical Collector Current Range | Small-signal range suitable for low-power loads and signal paths |
| Polarity | NPN, commonly used for low-side switching |
| DC Current Gain (hFE) | Moderate, stable gain in typical operating region |
| Saturation Voltage | Low VCE(sat), improving conduction efficiency in switching roles |
| Switching Speed | Fast switching for digital and driver applications |
| Mounting | Surface-mount, reflow compatible |
| Manufacturer | onsemi |
Standard SOT-23 pin assignment for MMBT3904LT1G:
1 – Base
2 – Emitter
3 – Collector
The SOT-23 package is widely supported by PCB manufacturers and assembly houses. Using onsemi's recommended pad layout, solder mask and stencil design helps achieve robust solder joints and reliable high-volume manufacturing performance.
Used in logic inverters, discrete gates, level shifters and timing circuits.
Suitable for driving LEDs, small relays, MOSFET gates and other low-power loads.
Applied in audio pre-amps, sensor interfaces, waveform shaping and filtering stages.
Works as the NPN complement to MMBT3906LT1G in push-pull, driver and amplifier circuits.
Equivalent NPN small-signal transistors include generic 2N3904 variants and other SOT-23 NPN BJTs with similar Ic, Vceo and gain characteristics. When selecting drop-in replacements, verify both electrical ratings and footprint compatibility.
onsemi provides a broad portfolio of discrete semiconductors with proven reliability in automotive, industrial, computing and consumer applications. The MMBT3904LT1G is a staple device in many long-life, high-volume designs due to its stable characteristics and assured supply.
We currently provide peer-to-peer order processing. Submit an RFQ for MMBT3904LT1G, and our professional agent will contact you with competitive global pricing and guide you to complete the order once you accept the offer.
Our experienced QC team strictly verifies and tests MMBT3904LT1G. Only qualified suppliers who pass our audit can list MMBT3904LT1G on OEM STOCK GLOBAL LIMITED. We pay close attention to sourcing channels and product quality so you can purchase with confidence.
Pricing and inventory for MMBT3904LT1G fluctuate and are updated periodically (typically within 24 hours). Quotations generally remain valid for 5 days unless otherwise stated.
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We perform Pre-Shipment Inspection (PSI) on randomly selected units before shipping. If there is an issue with MMBT3904LT1G, returns/replacements are accepted when:
Steps: (1) Inform us within 90 days; (2) Obtain Return Authorization (RMA) before sending items back.
Please contact us for technical documents and support related to onsemi MMBT3904LT1G, including pin diagrams and datasheets. Our team will respond promptly.
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