ULN2003APWG4

Overview

The ULN2003APWG4 is a high-voltage, high-current Darlington transistor array manufactured by Texas Instruments. It integrates seven independent Darlington pairs, each consisting of a driver transistor and a common emitter configuration with built-in clamp diodes for inductive load suppression. The device operates with NPN polarity and features TTL/CMOS compatible inputs. It is housed in a 16-pin PowerPAD TSSOP surface-mount package designed for through-hole or SMD installation. Key electrical specifications include a maximum continuous collector current of 500 mA per channel, a collector-emitter voltage rating of 50 V, and a collector-emitter saturation voltage of 1.1 V. The component supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Integrates seven high-voltage Darlington transistor pairs with common emitters for simplified circuit design.
• Includes integrated clamp diodes on each output to suppress voltage spikes from inductive loads.
• Features input resistors that provide direct compatibility with TTL, CMOS, PMOS, and DTL logic families.

Applications

• Relay drivers
• Stepper motor controllers
• DC brushed motor drivers
• High-current light and display drivers

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's official documentation to confirm RoHS compliance status and lead-free manufacturing details. Ensure the PowerPAD thermal pad connection requirements are addressed in the PCB layout to maintain reliable operation within the specified temperature range.

Selection Notes

Select this component when driving multiple inductive loads such as relays or solenoids from low-power logic sources. The internal resistor network eliminates the need for external base resistors. Consider the thermal performance of the PowerPAD package if multiple channels are driven simultaneously at high currents.

Part Context

This part belongs to the ULN2003A series of high-voltage Darlington arrays. It serves as a bridge between low-power digital control circuits and high-power analog loads. The 'P' indicates the TSSOP-16 package type, while 'W' denotes the PowerPAD thermal enhancement feature, distinguishing it from standard plastic packages.

Replacement Considerations

The ULQ2003A is a verified equivalent offering similar functionality but utilizes PNP transistors instead of NPN, requiring inverted logic levels. Other ULN2003 variants may differ in package style or temperature rating; verify pinout and electrical limits before substitution.