STA421A

Overview

The STA421A is a PNP general-purpose transistor manufactured by Sanken Electric. It features an absolute maximum collector-emitter voltage (VCEO) of -60 V and a continuous collector current (IC) rating of -3 A at 25°C ambient temperature. The device supports a peak collector current of -6 A with a pulse width up to 10 ms. Thermal performance includes a junction temperature range of -40°C to +150°C and a storage temperature range of -40°C to +150°C. Electrical characteristics specify a DC current gain (hFE) of 40 at VCE = -4 V and IC = -1 A, with a saturation voltage (VCE(sat)) of -1.0 V at IC = -2 A and IB = -0.2 A.

Feature Summary

• PNP configuration designed for general-purpose switching applications
• Capable of handling -3 A continuous collector current
• Operates within a wide thermal range from -40°C to +150°C

Applications

• General-purpose switching circuits
• Low-voltage power management systems
• Industrial control logic interfaces

Procurement Notes

Verify the specific datasheet revision and manufacturing date code upon order confirmation. Confirm that the component meets all required electrical parameters for the target application environment. Ensure proper handling procedures are followed during assembly to maintain device integrity. Check for any regional compliance certifications relevant to the destination market.

Selection Notes

Select this component for designs requiring a PNP transistor with -60 V breakdown voltage and -3 A current capacity. Evaluate the thermal resistance requirements based on the expected ambient temperature and heat dissipation conditions. Compare the hFE and VCE(sat) specifications against circuit load requirements to ensure adequate drive capability and minimal power loss during saturation.

Part Context

The STA421A belongs to Sanken Electric's lineup of discrete semiconductor devices intended for industrial and consumer electronics. As a PNP transistor, it serves as a fundamental building block for amplifier stages and switching networks. The manufacturer notes that this part is not recommended for new designs, suggesting consideration of updated alternatives for future projects.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Engineers should consult official replacement guides or contact the manufacturer directly for qualified cross-reference options.