STA408A

Overview

The STA408A is a PNP Darlington transistor manufactured by Sanken Electric. It features a collector-emitter voltage (VCEO) of -120 V and a continuous collector current (IC) rating of -4 A at 25°C. The device has a maximum power dissipation (PT) of 3 W under standard conditions, increasing to 20 W with an infinite heatsink at case temperature of 25°C. Junction temperature (Tj) reaches 150°C, with a storage range of -40 to +150°C. Key electrical characteristics include a DC current gain (hFE) of 2000 at VCE=-4V and IC=-2A, and saturation voltages of VCE(sat)=-1.5 V and VBE(sat)=-2.5 V.

Feature Summary

• High current gain capability suitable for general-purpose switching applications
• Robust thermal performance with high power dissipation limits when mounted on heatsinks
• Designed for reliable operation in automotive and industrial environments

Applications

• General purpose switching circuits
• Automotive electronic control units
• Industrial motor drive interfaces

Procurement Notes

Verify the component against the official Sanken Electric datasheet to confirm pinout and electrical ratings. Ensure the package matches the 10-pin STA configuration. Check for compliance with relevant automotive standards if used in vehicle systems. Confirm availability through authorized distributors to avoid counterfeit parts.

Selection Notes

Select the STA408A for applications requiring high current gain and moderate voltage handling up to 120 V. Consider thermal management requirements, as power dissipation depends heavily on heatsinking. Compare hFE and saturation voltages with alternative Darlington transistors to ensure compatibility with existing circuit designs and drive capabilities.

Part Context

The STA408A belongs to Sanken Electric's family of PNP Darlington transistors. Similar components include the STA308A, STA402A, and SLA4070. These devices share common characteristics such as high current gain and robust construction, making them suitable for various general-purpose and automotive applications requiring reliable switching performance.

Replacement Considerations

Potential substitutes include the STA308A, STA402A, and SLA4070 from Sanken Electric. Verify that replacement parts match the required voltage, current, and package specifications before integration into existing designs.