SMA4038

Overview

The SMA4038 is an NPN Darlington transistor array manufactured by Sanken Electric USA Inc. It features a built-in flywheel diode for inductive load protection. The device is housed in a compact SIP-8 package designed for through-hole mounting. This component integrates high-gain switching capabilities suitable for driving relays and solenoids.

Feature Summary

• Integrates NPN Darlington pairs with a built-in flywheel diode to suppress voltage spikes from inductive loads.
• Provides high current gain for efficient switching of moderate power devices.
• Utilizes a single inline package to minimize printed circuit board footprint.

Applications

• Driving electromagnetic relays
• Controlling DC solenoid valves
• Actuating small motors

Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm pinout compatibility and thermal characteristics. Ensure the ordering information matches the exact SIP-8 configuration required for the target application design.

Selection Notes

Select this component when a compact solution is needed for switching inductive loads without external snubber circuits. Consider the thermal dissipation requirements of the SIP-8 package relative to the ambient operating conditions.

Part Context

This part belongs to Sanken's general-purpose NPN Darlington series, which includes variants like the SLA4036 and SMA4032. These components are engineered for robust performance in consumer electronics and industrial control modules requiring reliable switching.

Replacement Considerations

SLA4036

FAQ

What is the primary function of the internal diode?

The built-in flywheel diode protects the transistor junctions from reverse voltage spikes generated by collapsing magnetic fields in connected inductive loads.

How does the SIP-8 package benefit the design?

The Single Inline Package allows for easy through-hole insertion and reduces the overall space required on the circuit board compared to discrete component arrangements.