ULN2003AINSR

Overview

The ULN2003AINSR is a high-voltage, high-current Darlington transistor array manufactured by Texas Instruments. It integrates seven NPN Darlington pairs, each with a 2.7 kΩ base resistor, designed for direct interfacing with 5 V TTL or CMOS logic. The device features open-collector outputs capable of sinking up to 500 mA per channel and withstanding at least 50 V in the OFF state. Integral clamp diodes are included on each output to handle inductive load flyback currents. Packaged in a 16-lead SOIC (NS) surface-mount format, it operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates seven independent NPN Darlington pairs with built-in 2.7 kΩ base resistors for direct logic interface
• Provides open-collector outputs with integral clamp diodes for safe switching of inductive loads
• Supports continuous load current of 500 mA per channel with high voltage tolerance

Applications

• Driving relays and solenoids from low-level logic circuits
• Controlling stepping motors and magnetic print hammers
• Multiplexed LED and incandescent display drivers
• High-current sink interfaces for microcontroller systems

Procurement Notes

Verify the specific suffix 'AINS' against the manufacturer's official datasheet to confirm the exact temperature grade and packaging specifications. Ensure the ordering part number matches the required tape-and-reel configuration for automated assembly processes. Cross-reference the manufacturer's latest documentation to validate that the component remains active and compliant with current manufacturing standards before finalizing procurement.

Selection Notes

Select this component when a single package must drive multiple high-current loads directly from 5 V logic without external driver transistors. The integrated base resistors simplify circuit design by eliminating external components. Consider the thermal dissipation capabilities of the SOIC package if multiple channels are activated simultaneously at high duty cycles. Verify that the 50 V voltage rating meets the peak reverse voltage requirements of the connected inductive loads.

Part Context

The ULN2003A series belongs to Texas Instruments' family of high-voltage Darlington arrays, widely used for interfacing digital logic with power peripherals. The 'A' suffix typically denotes an extended commercial/industrial temperature range compared to standard variants. The 'NS' suffix indicates the 16-lead Small Outline Integrated Circuit (SOIC) package, offering a compact surface-mount alternative to the traditional PDIP form factor while maintaining electrical equivalence.

Replacement Considerations

The ULN2003AN serves as a pin-compatible through-hole replacement. For surface-mount applications, verify electrical equivalence with other ULN2003A variants from different manufacturers, ensuring matching pinout, current ratings, and voltage tolerances.