ULN2003LVPWR

Overview

The ULN2003LVPWR is a low-voltage Darlington transistor array manufactured by Texas Instruments. It integrates seven NPN Darlington pairs with common emitters in a single package, designed for driving high-current loads from low-voltage logic inputs. The device features integrated suppression diodes to protect against inductive load back-EMF. Key electrical parameters include a maximum continuous collector current of 500 mA per channel and a maximum collector-emitter voltage of 50 V. The input pins are arranged opposite the output pins to facilitate printed circuit board layout. It operates within a temperature range of -40°C to +125°C and is housed in a 16-pin TSSOP surface-mount package.

Feature Summary

• Integrates seven independent NPN Darlington pairs with common emitters for multi-channel switching
• Includes built-in clamping diodes across each output to suppress voltage spikes from inductive loads
• Features TTL/CMOS compatible inputs allowing direct interfacing with standard logic families
• Pinout design places inputs directly opposite corresponding outputs to simplify PCB routing

Applications

• Relay driver circuits for switching inductive loads
• Stepper motor and DC brushed motor control interfaces
• High-current buffer stages for logic signal amplification
• LED display and filament lamp driving systems

Procurement Notes

Verify the specific suffix 'LVPWR' indicates the low-voltage variant and TSSOP-16 package configuration. Confirm the manufacturer source is Texas Instruments or an authorized distributor. Check for RoHS compliance status and ensure the component matches the required operating temperature range of -40°C to +125°C before procurement.

Selection Notes

Select this component when driving inductive loads such as relays or solenoids from low-voltage microcontrollers. The 500 mA per channel rating supports moderate power requirements. Ensure the application voltage does not exceed the 50 V collector-emitter limit. Consider the TSSOP-16 package constraints if thermal dissipation is critical, as parallel outputs may be required for higher total current demands.

Part Context

This part belongs to the ULN2003A family of high-voltage, high-current Darlington arrays. While the standard ULN2003A typically targets 5V logic, the LVPWR designation suggests optimization for lower voltage operation or specific packaging variants. It serves as a bridge between low-power digital logic and high-power analog loads, replacing discrete transistor arrangements in compact designs.

Replacement Considerations

Direct substitutes include the ULN2003APWR (standard voltage version) and ULN2003AN (DIP package). Cross-manufacturer equivalents like STMicroelectronics ULN2003A offer similar pinouts and electrical characteristics. Verify that any replacement maintains the 500 mA per channel current rating and integrated flyback diode functionality.