STA402A

Overview

The STA402A is a PNP Darlington general-purpose transistor manufactured by Sanken Electric. It features an absolute maximum collector-emitter voltage (VCEO) of -50 V and a continuous collector current (IC) rating of -4 A at 25°C ambient temperature. The device supports a peak collector current (ICP) of -8 A with a pulse width up to 10 ms. Key electrical characteristics include a DC current gain (hFE) of 1000 at VCE = -4 V and IC = -3 A, and a saturation voltage (VCE(sat)) of -2.0 V under the same conditions. The junction temperature (Tj) maximum is 150°C, with a storage temperature range from -40°C to +150°C.

Feature Summary

• PNP Darlington configuration for high current gain applications
• General-purpose design suitable for switching and amplification
• Robust thermal performance with defined safe operating area

Applications

• General purpose switching circuits
• Amplifier stages requiring high input impedance
• Driver circuits for loads within 4A continuous limit

Procurement Notes

Verify the specific package type and marking code against the official Sanken Electric datasheet before ordering. Ensure that the supply voltage does not exceed the -50 V VCEO rating in your circuit design. Confirm thermal management requirements align with the provided Safe Operating Area curves for your intended duty cycle.

Selection Notes

Select this component when a PNP Darlington structure is required for high gain and moderate current handling up to 4 A. Consider the -2.0 V typical saturation voltage for power loss calculations. Evaluate the thermal resistance characteristics if operating near the maximum junction temperature of 150°C or in high ambient environments.

Part Context

The STA402A belongs to Sanken Electric's line of PNP Darlington transistors designed for general-purpose use. It is part of a family including similar devices like the STA408A and SLA4070, offering standardized pinouts and electrical profiles for interchangeable design solutions in consumer and industrial electronics.

Replacement Considerations

Direct substitutes may include other PNP Darlington transistors with matching -50 V VCEO and -4 A IC ratings. Verify pin compatibility and hFE ranges. Cross-reference with Sanken's recommended alternatives or comparable parts from other manufacturers ensuring identical package dimensions and thermal characteristics.