BCX17LT1

Overview

The onsemi BCX17LT1 is a PNP small-signal transistor housed in an SOT-23 (TO-236AB) surface-mount package. It features a maximum collector-emitter voltage of 45 Vdc and a continuous collector current rating of 500 mAdc. The device operates within a junction temperature range of -55°C to +150°C. On FR-5 boards, total power dissipation is 225 mW at 25°C ambient, while alumina substrates support up to 300 mW. DC current gain ranges from 40 to 600 depending on collector current.

Feature Summary

• PNP polarity configuration for low-voltage switching applications
• Integrated thermal management via SOT-23 footprint optimization
• High breakdown voltage tolerance for signal processing

Applications

• General-purpose signal amplification
• Low-voltage switching circuits
• Digital logic interface stages

Procurement Notes

Verify the manufacturer origin, as the component was originally manufactured by Motorola before acquisition by onsemi. Confirm the specific datasheet revision matches the required electrical tolerances. Ensure the ordering suffix LT1 corresponds to the correct tape-and-reel packaging format for automated assembly processes.

Selection Notes

Select this component when a PNP transistor with a 45V collector-emitter rating is required in a compact SOT-23 form factor. Consider the thermal resistance characteristics if operating near the maximum junction temperature limits. Evaluate the DC current gain requirements against the specified minimums for the intended load conditions.

Part Context

This device belongs to the BCX17/BCX18/BCX19/BCX20 series of small-signal transistors. These parts share identical physical dimensions and pinouts but differ in their voltage ratings. The BCX17 variant specifically provides the highest voltage capability within this particular grouping.

Replacement Considerations

Direct substitutes include BCX18LT1, BCX19LT1, and BCX20LT1, which share the same package and pinout but offer different voltage ratings.