SN75468NG4

Overview

The SN75468NG4 is a high-voltage Darlington transistor array manufactured by Texas Instruments. It integrates seven independent NPN Darlington pairs within a single 16-pin PDIP package. The device supports a maximum collector-emitter voltage of 100V and a continuous collector current of 500mA per channel. It features an internal clamp diode connected to the emitter of each output transistor, facilitating the direct driving of inductive loads such as relays and solenoids without external protection components. The component is RoHS compliant and operates within a junction temperature range up to 150°C.

Feature Summary

• Integrates seven independent NPN Darlington transistor pairs for multi-channel switching applications
• Includes internal flyback diodes connected to each output emitter to manage inductive load back-EMF
• Designed for high-voltage operation with a 100V collector-emitter breakdown rating
• Supports surface-mount or through-hole integration depending on specific package variant

Applications

• Driving stepper motors and other peripheral devices requiring multiple control channels
• Switching inductive loads such as relays, solenoids, and lamps
• General-purpose high-voltage switching circuits in industrial control systems

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and package dimensions. Ensure the selected variant matches the required thermal management strategy for the intended application environment. Cross-reference datasheet revisions to confirm electrical characteristics remain consistent with design specifications.

Selection Notes

Select this component when a high-voltage solution is required for driving multiple inductive loads from low-current logic signals. The integrated clamp diodes simplify circuit design by eliminating the need for external freewheeling diodes. Consider thermal dissipation requirements due to the saturation voltage drop across the Darlington pairs during conduction.

Part Context

The SN75468 belongs to the SN7546x series of Darlington transistor arrays produced by Texas Instruments. This family provides a cost-effective method for interfacing microcontrollers or logic gates with higher power loads. The 'G4' suffix typically indicates lead-free construction and compliance with specific environmental standards defined by the manufacturer.

Replacement Considerations

The ULN2003 is a common alternative offering similar functionality but with lower voltage ratings (typically 50V). Verify that the 100V rating of the SN75468 is necessary for the specific load voltage before substituting.