SMA4033

Overview

The SMA4033 is a single NPN Darlington transistor manufactured by Sanken Electric USA Inc. It features an integrated flywheel diode for flyback voltage absorption and is housed in a SIP-12 package. The device supports a collector-emitter voltage (VCEO) of 100 V and a continuous collector current (IC) of 2 A. Peak collector current reaches 4 A with a pulse width up to 1 ms. DC current gain (hFE) ranges from 2000 to 15000 at IC=1A and VCE=4V. Maximum power dissipation is 4 W at 25°C ambient temperature, extending to 20 W at 25°C case temperature. The junction temperature maximum is 150°C.

Feature Summary

• Integrated flywheel diode for efficient flyback voltage absorption
• High DC current gain suitable for sensitive control applications
• Robust peak current handling capability for transient loads

Applications

• Motor driver circuits requiring high gain and flyback protection
• Relay driver stages for switching inductive loads
• Power supply output regulation and control loops

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm pinout compatibility and thermal characteristics. Confirm RoHS compliance status and moisture sensitivity level prior to integration into production assemblies. Ensure adequate heatsinking is provided if operating near maximum power dissipation limits.

Selection Notes

Select this component when a high-gain NPN Darlington configuration with built-in flyback protection is required. Evaluate the thermal resistance requirements based on the expected ambient temperature and duty cycle. Compare the 2 A continuous current rating against the application's steady-state load requirements to ensure reliable operation within the safe operating area.

Part Context

This component belongs to Sanken Electric's discrete semiconductor lineup, specifically designed for power switching applications. It complements other Darlington arrays and single transistors offered by the manufacturer for industrial and automotive electronics. The SIP-12 packaging facilitates through-hole mounting on printed circuit boards.

Replacement Considerations

Consult official cross-reference data or distributor databases for verified substitute part numbers. Ensure any replacement maintains identical pinout configurations, voltage ratings, and thermal performance characteristics to guarantee functional equivalence without redesigning the host circuit.