BC856B/DG/B4R

Overview

The BC856B/DG/B4R is a PNP general-purpose transistor manufactured by Nexperia USA Inc. It operates with a maximum collector-emitter voltage of -65 V and a continuous collector current of -100 mA. The device utilizes an SOT-323 (SC-70) surface-mount package, offering a compact footprint suitable for space-constrained designs. It features a transition frequency of 100 MHz and a power dissipation capability of 200 mW at room temperature. The component is RoHS compliant and supports a junction temperature up to 150°C.

Feature Summary

• PNP bipolar junction transistor configured for general-purpose switching and amplification tasks
• Ultra-small SOT-323 surface-mount package designed for high-density board layouts
• Optimized for low-voltage and low-current applications within standard operating ranges

Applications

• General-purpose signal switching in consumer electronics
• Amplifier stages in audio and RF circuits
• Driver circuits for low-power loads in portable devices

Procurement Notes

Verify the specific suffix DG/B4R against official Nexperia documentation to confirm exact binning or tape-and-reel specifications. Ensure compatibility with existing PCB footprints for the SOT-323 package. Confirm that the requested variant meets all required electrical tolerances for the target application environment before finalizing procurement orders.

Selection Notes

Select this component when a small-form-factor PNP transistor is required for low-power switching. The BC856B series offers standardized gain bins suitable for general use. Consider the SOT-323 package constraints regarding thermal dissipation and ensure adequate copper area for heat spreading if operating near maximum ratings.

Part Context

This part belongs to the BC856 family of PNP transistors from Nexperia, which are widely used as complements to the BC846 NPN series. The family provides standardized performance across various gain grades, facilitating easy substitution in existing designs. The BC856B variant specifically targets applications requiring balanced performance characteristics without specialized high-gain requirements.

Replacement Considerations

Direct pin-to-pin replacements include other BC856B variants in the SOT-323 package from different manufacturers, provided electrical parameters such as VCEO, IC, and hFE match the design requirements. Verify package dimensions and lead material compatibility before substitution.