SMMBT3904LT1G Transistor Specifications Applications and Suppliers

ElecSuppliers Part Number GuideAug 15, 2026

SMMBT3904LT1G is an NPN bipolar junction transistor designed for general purpose switching and amplification applications. It is a compact surface mount device intended for electronic circuits where a small signal transistor is required.

The part number is commonly used when selecting a transistor for a specific BOM. Using the complete SMMBT3904LT1G designation is important because the broader 3904 transistor family includes products from different manufacturers and with different package configurations.

SMMBT3904LT1G Key Characteristics

As an NPN transistor SMMBT3904LT1G can be used to control current through a circuit by applying an appropriate signal to its base.

Important characteristics to consider include collector emitter voltage collector current DC current gain and power dissipation. These parameters determine whether the transistor is suitable for the intended switching or amplification function.

The actual performance also depends on the circuit conditions and the way the transistor is driven.

SMMBT3904LT1G Applications

SMMBT3904LT1G can be used in general purpose electronic circuits where an NPN transistor is required.

Typical applications include signal amplification low power switching driver circuits interface circuits control circuits and other electronic equipment.

It can be useful in compact PCB designs where a small surface mount transistor is preferred over a larger through hole component.

SMMBT3904LT1G Package

Package configuration should be checked carefully when using SMMBT3904LT1G in a PCB design.

The package determines the physical footprint and terminal arrangement on the board. When replacing another 3904 series transistor the electrical characteristics and package should both be compared.

A transistor with a similar name is not necessarily a direct replacement if its pin configuration or package differs.

SMMBT3904LT1G and 2N3904

SMMBT3904LT1G is associated with the widely known 3904 family of NPN transistors. The 2N3904 designation is also commonly used for general purpose NPN transistor products.

However the two part numbers should not be treated as automatically interchangeable. Engineers should compare voltage ratings current ratings gain package and pin configuration before using one in place of another.

SMMBT3904LT1G Suppliers

When sourcing SMMBT3904LT1G buyers should provide the complete part number when requesting quotations.

The manufacturer package electrical specifications product status and required quantity should be confirmed before purchasing.

For production BOM sourcing it is especially important to verify that the supplier is offering the exact SMMBT3904LT1G ordering code rather than another 3904 series transistor.

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