SMA4030

Overview

The SMA4030 is a general-purpose 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 3 A. The device provides a high DC current gain (hFE) ranging from 2000 to 15,000 at IC=1.5A and VCE=4V. Key electrical characteristics include a saturation voltage (VCE(sat)) of 1.1 V to 1.5 V and a transition frequency (fT) of 40 MHz. It operates within a junction temperature range up to 150°C and utilizes a SIP-21 package with integrated base resistors.

Feature Summary

• High current amplification capability suitable for low input drive applications
• Integrated base resistor network simplifies circuit design
• Robust thermal performance with a maximum junction temperature of 150°C

Applications

• General purpose switching circuits
• Driver stages for relays and solenoids
• Logic interface circuits requiring high gain

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct pin configuration and resistance values. Confirm package type compatibility during sourcing. Check for RoHS compliance status if required by project specifications. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability.

Selection Notes

Select this component when high current gain is required with minimal base drive current. The integrated resistors reduce external component count compared to discrete Darlington pairs. Verify that the 100 V collector-emitter voltage meets the system's peak operating requirements. Consider the 3 A continuous current limit for load sizing.

Part Context

The SMA4030 belongs to Sanken's SMA series of NPN Darlington transistors. This series is characterized by built-in base resistors designed to simplify biasing in switching applications. The device is part of a broader family including variants with different resistance values and packaging options, tailored for general-purpose use in consumer and industrial electronics.

Replacement Considerations

Direct replacements must match the SIP-21 package, 100 V VCEO, 3 A IC rating, and similar hFE ranges. Verify equivalent internal resistor values if present. Consult manufacturer cross-reference lists for confirmed substitutes with identical electrical and mechanical specifications.