SLA4051

Overview

The SLA4051 is an NPN Darlington transistor array manufactured by Sanken Electric USA Inc., housed in a SIP 21 with Fin package. It integrates nine NPN Darlington elements and built-in freewheeling diodes for transient suppression. Key electrical ratings include a collector-emitter voltage (VCEO) of 120 V, a DC collector current (IC(DC)) of 2 A, and a typical DC current gain (hFE) of 5000 at IC = 1 A. The typical collector-emitter saturation voltage (VCE(sat)) is 1.1 V at IC = 1 A and IB = 2 mA. Maximum allowable power dissipation is 5 W at TA=25°C without a heatsink and 25 W at TC=25°C.

Feature Summary

• Integrates nine NPN Darlington transistor elements within a single component.
• Includes built-in freewheeling diodes to suppress voltage transients from inductive loads.
• Provides high DC current gain suitable for interfacing low-level logic signals with high-current devices.

Applications

• Relay driver circuits
• Solenoid driver applications
• Lamp driver systems
• LED drive circuits

Procurement Notes

Verify the specific datasheet revision and manufacturing date code on the component marking before integration. Confirm that the SIP 21 with Fin package dimensions match the target PCB footprint and heatsinking requirements. Ensure handling procedures adhere to electrostatic discharge precautions during assembly.

Selection Notes

Select this component when driving inductive or high-current loads requiring isolation from control logic. The integrated flyback diodes simplify circuit design by eliminating external protection components. Verify thermal management capabilities, as power dissipation increases significantly under continuous operation or high ambient temperatures.

Part Context

This device belongs to Sanken's lineup of NPN Darlington transistor arrays designed for general-purpose electronic equipment. It serves as a robust interface between digital logic families and analog loads such as relays and solenoids. The SIP 21 package facilitates mounting on heatsinks for improved thermal performance in industrial and consumer applications.

Replacement Considerations

Direct pin-compatible replacements are not explicitly listed in the provided documentation. Evaluate other SIP 21 Darlington arrays from different manufacturers only if their electrical characteristics, specifically VCEO, IC(DC), and package dimensions, strictly match the SLA4051 specifications.

FAQ

What is the maximum collector-emitter voltage rating?

The maximum collector-emitter voltage (VCEO) is rated at 120 V.

How many transistor elements are included in the array?

The SLA4051 contains nine NPN Darlington transistor elements.

Are external flyback diodes required for inductive loads?

No, the device features built-in freewheeling diodes for transient suppression, making external diodes unnecessary.