BCM857BS/ZLX

Overview

The BCM857BS/ZLX is a PNP/PNP matched double transistor manufactured by Nexperia USA Inc. It is housed in a TSSOP6 (SOT363-3) surface-mounted plastic package with six leads. The device features fully isolated internal transistors and provides a collector-emitter voltage (VCEO) of -45 V and a continuous collector current (IC) of -100 mA per transistor. Key electrical characteristics include a DC current gain (hFE) ranging from 200 to 450 at VCE = -5 V and IC = -2 mA, and a transition frequency (fT) between 100 MHz and 175 MHz. The total power dissipation is limited to 300 mW for the device and 200 mW per transistor at an ambient temperature of 25 °C.

Feature Summary

• Current gain matching between the two transistors
• Base-emitter voltage matching within 2 mV
• Fully isolated internal transistor structure

Applications

• Current mirror circuits
• Differential amplifier configurations

Procurement Notes

Verify the specific ordering suffix /ZLX against official Nexperia documentation to confirm packaging details such as reel size or tape-and-reel specifications. Confirm that the non-automotive qualified status aligns with your application requirements, as automotive versions require different part numbers. Ensure compliance with RoHS standards before finalizing procurement orders.

Selection Notes

Select this component when precise matching of current gain and base-emitter voltage is required for analog signal processing. The SOT363-3 package is suitable for space-constrained designs. Consider the thermal resistance values if operating near maximum power dissipation limits. Verify that the -45 V rating meets the circuit's voltage requirements.

Part Context

The BCM857BS belongs to Nexperia's family of matched double transistors designed for precision analog applications. It serves as a drop-in replacement for standard discrete double transistors, simplifying PCB layout and improving performance consistency in matched pairs. The ZLX suffix typically denotes specific manufacturing or packaging variations within the standard product line.

Replacement Considerations

Check for alternative matched pair transistors with similar VCEO and IC ratings if supply constraints exist. Ensure any substitute maintains comparable hFE matching and VBE matching specifications to preserve circuit accuracy in differential or mirror configurations.