STA475A

Overview

The STA475A is an NPN Darlington transistor manufactured by Sanken Electric USA Inc., housed in a 10-pin external dimension package. It features a collector-emitter voltage (VCEO) of 100±15 V and a continuous collector current (IC) rating of 2 A, with a peak pulse current (ICP) of 4 A for pulses ≤1 ms. The device includes a built-in avalanche diode and internal resistors R1 (4 kΩ typical) and R2 (150 Ω typical). Key electrical characteristics include a DC current gain (hFE) ranging from 2000 to 12000 at IC=1 A and VCE=4 V, a saturation voltage VCE(sat) of 1.5 V max, and a storage temperature range of –40 to +150 °C.

Feature Summary

• Integrated avalanche protection diode for enhanced robustness against voltage transients
• High DC current gain (hFE) up to 12000 under standard test conditions
• Internal biasing network comprising a 4 kΩ resistor and a 150 Ω resistor

Applications

• High-gain amplification stages requiring integrated biasing
• Switching applications within the specified safe operating area
• Circuits necessitating avalanche energy handling capability

Procurement Notes

Verify component authenticity through authorized Sanken distributors or direct manufacturer channels. Confirm that the received units match the specific 10-pin package dimensions and electrical ratings documented in the official datasheet. Ensure compliance with RoHS and REACH requirements as specified in the product documentation before integration into final assemblies.

Selection Notes

Select this component when high current gain and avalanche ruggedness are required in a single package. Evaluate the thermal resistance characteristics against the expected ambient temperature and heat sinking configuration. Consider the internal resistor values for biasing stability and ensure the 2 A continuous current rating meets the load requirements without exceeding the safe operating area limits.

Part Context

The STA475A belongs to Sanken's NPN Darlington transistor series designed for robust power switching and amplification. It integrates protective and biasing elements to simplify circuit design. This specific model is marked as Not Recommended for New Designs, indicating potential obsolescence or replacement by newer generations within the manufacturer's portfolio.

Replacement Considerations

Consult Sanken Electric for current alternative part numbers suitable for new designs, as the STA475A is explicitly marked as Not Recommended for New Designs. Verify pin compatibility and electrical parameter equivalence if substituting existing inventory.