STA473A

Overview

The STA473A is an NPN Darlington transistor manufactured by Sanken Electric USA Inc. It features a collector-emitter voltage (VCEO) of 100 V and a continuous collector current (IC) rating of 2 A. The device includes a built-in avalanche diode for enhanced reliability. Key electrical characteristics at 25°C include a DC current gain (hFE) ranging from 2000 to 12000 at IC=1A, and a collector-emitter saturation voltage (VCE(sat)) of 1.5 V maximum. The junction temperature (Tj) limit is 150°C, with a storage temperature range of -40°C to +150°C.

Feature Summary

• NPN Darlington configuration designed for general-purpose applications
• Integrated avalanche diode for improved robustness
• High DC current gain suitable for low drive currents

Applications

• General purpose switching circuits
• Driver stages requiring high current gain
• Logic interface applications

Procurement Notes

Verify the specific package type and pinout configuration against the official Sanken Electric datasheet before integration. Confirm that the thermal management strategy aligns with the specified power dissipation limits under natural cooling or heatsink conditions. Ensure operating parameters remain within the absolute maximum ratings defined in the component documentation.

Selection Notes

Select this component when a high current gain Darlington pair is required in a compact form factor. Consider the built-in avalanche capability if the application involves inductive load switching. Evaluate the thermal resistance characteristics to determine if additional heatsinking is necessary for sustained operation above ambient temperatures.

Part Context

The STA473A belongs to the STA series of NPN Darlington transistors produced by Sanken Electric. This series is characterized by high current gain and integrated protection features. The component is typically housed in a multi-pin package suitable for through-hole mounting, distinguishing it from surface-mount alternatives in the manufacturer's portfolio.

Replacement Considerations

Consult the Sanken Electric equivalent part list for direct replacements. Verify compatibility regarding pinout, voltage ratings, and thermal performance before substituting with components from other manufacturers.