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The BD138 is an NPN silicon epitaxial planar transistor manufactured by onsemi. It is housed in the SOT-32 plastic package and is designed for use in audio amplifiers and drivers utilizing complementary or quasi-complementary circuits. The device features DC current gain that is pre-selected to ensure consistent performance characteristics across production batches.
Verify the specific suffix '16STU' against official manufacturer documentation to confirm package type and tape-and-reel specifications. Ensure the component matches the required NPN polarity and SOT-32 footprint before integration into designs.
Select this component when a pre-matched NPN transistor is required for complementary pairs. Verify that the SOT-32 package dimensions fit the PCB layout constraints and that the thermal requirements align with the application's power dissipation limits.
This part belongs to the BD135-BD140 family of power bipolar transistors. The BD138 serves as the NPN counterpart to the BD139, while the BD136 and BD140 provide the complementary PNP options. This family is standardized for audio and driver applications requiring matched gain characteristics.
Compatible substitutes include the BD139 (NPN) and BD135 (NPN) from the same series. Verify pinout compatibility and thermal resistance values when substituting with other manufacturers' equivalents.