SMMBT3904LT1G Specifications and Suppliers

ElecSuppliers Part Number GuideAug 14, 2026

SMMBT3904LT1G is an NPN bipolar junction transistor (BJT) from onsemi. It is designed for general-purpose switching and amplification applications and is supplied in a compact surface-mount package.

The device is part of the widely used 2N3904 transistor family and is intended for electronic circuits where a small-signal NPN transistor is required in a space-saving SMD package.

SMMBT3904LT1G at a Glance

SMMBT3904LT1G is an NPN transistor with a maximum collector-emitter voltage of 40 V and a maximum collector current of 200 mA. It uses a SOT-23 surface-mount package with three terminals.

The device is suitable for low-power switching and signal amplification applications where the electrical characteristics of the transistor match the circuit requirements.

Electrical Characteristics

The main specifications associated with SMMBT3904LT1G include:

Manufacturer: onsemi

Device type: NPN Bipolar Transistor

Transistor polarity: NPN

Collector-emitter voltage: 40 V

Collector current: 200 mA

DC current gain: dependent on operating conditions

Package: SOT-23

Mounting: Surface Mount

The actual current gain, saturation voltage, switching characteristics and other parameters vary according to operating conditions. Engineers should therefore check the complete electrical specifications when designing a circuit around this device.

Package and Board Mounting

SMMBT3904LT1G uses a SOT-23 surface-mount package. The compact package is suitable for PCB designs where board space is limited and automated SMT assembly is preferred.

Compared with traditional through-hole transistor packages, the SOT-23 format allows the component to be placed directly on the PCB surface and is commonly used in compact electronic assemblies.

Where Is SMMBT3904LT1G Used?

SMMBT3904LT1G can be used for general-purpose transistor switching and amplification.

Typical circuit applications include signal switching, low-current control circuits, driver stages, interface circuits and other electronic designs requiring an NPN small-signal transistor.

The transistor can also be used to control loads that cannot be driven directly by a microcontroller or other low-current logic device, provided that the voltage, current and power requirements remain within the transistor's specified limits.

SMMBT3904LT1G Supplier Information

When purchasing SMMBT3904LT1G, buyers should identify the complete manufacturer part number and confirm that the supplied device matches the required package and electrical specifications.

For production sourcing, factors such as available quantity, packaging, lead time, product traceability and supplier reliability may also be important.

ElecSuppliers provides a platform for buyers to find electronic component suppliers and review supplier information for SMMBT3904LT1G and other semiconductor components.

Buying Considerations

Before selecting SMMBT3904LT1G for a project, engineers should check the collector-emitter voltage, collector current, power dissipation, current gain and switching characteristics required by the application.

Buyers should also distinguish between the complete ordering code and related transistor variants. Similar-looking part numbers may have different package configurations, electrical ratings or ordering conditions.

For production applications, the latest manufacturer documentation should be checked before final component selection.

Find SMMBT3904LT1G Suppliers

Buyers searching for SMMBT3904LT1G suppliers can use ElecSuppliers to find companies offering this onsemi transistor and other electronic components.

Supplier availability, pricing, packaging and lead times can change according to market conditions and order quantities. Buyers should contact suppliers directly to confirm current product and purchasing information.