ULN2003APWRG4

Overview

The ULN2003APWRG4 is a high-voltage, high-current Darlington transistor array manufactured by Texas Instruments. It integrates seven independent NPN Darlington pairs within a single package, each featuring common emitters and integrated clamp diodes for inductive load suppression. The device operates with a maximum continuous collector current of 500 mA per channel and supports a collector-emitter voltage (Vceo) of 50 V. It utilizes a 16-pin TSSOP surface-mount package suitable for through-hole or SMD installation. The operational temperature range spans from -40°C to +125°C, ensuring reliability in demanding environments.

Feature Summary

• Integrates seven high-voltage Darlington transistor pairs with common emitters for multi-channel driving capability
• Includes integrated clamp diodes across each output and emitter to suppress inductive kickback voltages
• Features TTL and CMOS compatible input logic levels for direct interfacing with standard digital controllers

Applications

• Relay driver circuits requiring high switching currents
• Stepper motor and DC brushed motor control systems
• Lighting drivers for LEDs and gas discharge lamps
• Line drivers and logic buffer applications

Procurement Notes

Verify the specific suffix 'PWRG4' confirms the TSSOP-16 package and lead-free RoHS compliance status. Ensure the ordering part number matches the required tape-and-reel quantity if automated assembly is planned. Cross-reference the manufacturer's latest datasheet revision to confirm pinout consistency and thermal characteristics before finalizing procurement specifications.

Selection Notes

Select this component when seven independent low-side switching channels are required within a compact surface-mount footprint. The integrated clamp diodes simplify design by eliminating external flyback diodes for inductive loads. Verify that the 500 mA per-channel limit meets the peak current demands of the connected relays or motors without exceeding thermal dissipation limits in the TSSOP-16 package.

Part Context

This component belongs to the ULN2003A family of high-voltage Darlington arrays developed by Texas Instruments. It serves as a robust interface between low-power logic circuits and high-power loads. The 'AN' variant denotes a PDIP package, while the 'PWRG4' designation indicates the TSSOP surface-mount version with green molding compound and lead-free construction, aligning with modern environmental standards.

Replacement Considerations

The ULN2003DR is a direct pin-compatible alternative in an SOIC-16 package. For TSSOP-16 replacements, verify equivalent electrical parameters such as Vceo and Ic ratings. Ensure any substitute maintains the same internal resistor network values to preserve input compatibility with existing TTL or CMOS drive signals.