ULN2001A

Overview

The ULN2001A is a high-voltage, high-current Darlington array manufactured by STMicroelectronics. It contains seven open-collector Darlington pairs with common emitters within a single package. Each channel supports an output current of 500 mA and can withstand peak currents up to 600 mA. The device features an output voltage rating of 50 V and includes integrated suppression diodes for driving inductive loads. Inputs are pinned opposite outputs to simplify board layout. The component operates within a temperature range of -20 °C to 85 °C and is housed in a 16-pin DIP package with a copper leadframe.

Feature Summary

• Contains seven open collector Darlington pairs with common emitters
• Integrated suppression diodes included for inductive load driving
• Input pins placed opposite to output pins to simplify layout
• Compatible with general purpose, DTL, TTL, PMOS, and CMOS logic families

Applications

• Driving solenoids
• Relay control circuits
• DC motor driving
• LED display and filament lamp drivers
• Thermal printhead interfaces
• High-power buffer applications

Procurement Notes

Verify the specific manufacturer source when ordering, as multiple vendors produce this component. Confirm the package type matches design requirements, as the ULN2001A is typically supplied in a 16-pin DIP package with a copper leadframe. Ensure compatibility with the intended logic family inputs before finalizing procurement specifications.

Selection Notes

Select the ULN2001A for applications requiring general-purpose interface capabilities across DTL, TTL, PMOS, and CMOS logic families. Choose this variant over other ULN200x series members when standard logic level compatibility is required rather than specific voltage thresholds found in ULN2002 or ULN2004 variants. Verify thermal management needs due to the copper leadframe construction.

Part Context

The ULN2001A belongs to the ULN200x series of high-voltage Darlington arrays from STMicroelectronics. This series also includes ULN2002, ULN2003, and ULN2004, which differ primarily in input threshold voltages tailored for specific logic families. The ULN2001A serves as the general-purpose option within this lineup, offering broad compatibility for various digital control systems.

Replacement Considerations

Direct substitutes include ULN2003 for TTL/CMOS compatible designs and ULN2004 for CMOS/PMOS applications. Cross-reference pinouts and electrical ratings carefully when substituting, as input voltage thresholds vary between ULN2001A, ULN2002, ULN2003, and ULN2004 variants.