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ULN2803A DIP-18 packageRepresentative package image. See datasheet for exact dimensions.

ULN2803A

by STMicroelectronics

Eight-channel Darlington transistor array, 500 mA per channel, 50 V, integral suppression diodes, DIP-18

ManufacturerSTMicroelectronics
CategoryInterface ICs
SeriesULN280xA
PackageDIP-18
DatasheetULN2803A PDF
Availability
ULN2803A Datasheet PDFAll specifications
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ULN2803A Overview

The ULN2803A is an eight-channel Darlington array from ST in an 18-lead plastic DIP. Each channel handles 500 mA continuous (600 mA peak) and withstands 50 V off-state, with suppression diodes for inductive loads and a 2.7 kΩ input resistor for 5 V TTL and CMOS logic.

Key Features

  • Eight Darlington transistors with common emitters
  • Output current to 500 mA, output voltage to 50 V
  • Integral suppression diodes for inductive loads
  • 2.7 kΩ input resistor for 5 V TTL and CMOS
  • Outputs can be paralleled for higher current
  • Inputs pinned opposite outputs to simplify board layout

Applications

  • Relay and solenoid drivers
  • Stepper-motor and lamp drivers
  • Logic-to-load interfacing from 5 V microcontrollers

ULN2803A Specifications

Part NumberULN2803A
ManufacturerSTMicroelectronics
CategoryInterface ICs
SeriesULN280xA
Package / CaseDIP-18
Channels8 Darlington transistors
Output current500 mA continuous (600 mA peak)
Output voltageUp to 50 V
Input2.7 kΩ series resistor, for 5 V TTL and CMOS

Specifications are taken from the manufacturer's public datasheet and are for reference. Confirm against the latest datasheet before design-in.

ULN2803A Pinout & Package

ULN2803A is supplied in a DIP-18 package. The full pin configuration, pin descriptions and mechanical drawing are published in the STMicroelectronics datasheet (open ULN2803A datasheet PDF). Always check the footprint against the latest datasheet revision before layout.

ULN2803A Alternatives & Equivalents

Part NumberManufacturerCompatibilityRFQ
ULN2801ASTMicroelectronicssame datasheet, general-purpose input
ULN2802ASTMicroelectronicssame datasheet, 10.5 kΩ input with Zener for 14–25 V PMOS
ULN2804ASTMicroelectronicssame datasheet, 10.5 kΩ input for 6–15 V CMOS

Alternatives are for reference. Verify pinout, electrical characteristics and firmware against each datasheet before substituting.

ULN2803A FAQ

Who manufactures ULN2803A?

ULN2803A is manufactured by STMicroelectronics and belongs to the ULN280xA series. It is listed under Interface ICs.

What is ULN2803A?

ULN2803A: Eight-channel Darlington transistor array, 500 mA per channel, 50 V, integral suppression diodes, DIP-18.

What package does ULN2803A come in?

ULN2803A comes in a DIP-18 package.

Where can I download the ULN2803A datasheet and pinout?

The STMicroelectronics datasheet for ULN2803A is linked in the Datasheet section of this page (https://www.st.com/resource/en/datasheet/uln2803a.pdf). The pin configuration and package drawing are in that datasheet.

What is the equivalent or alternative to ULN2803A?

Documented alternatives to ULN2803A: ULN2801A (STMicroelectronics, same datasheet, general-purpose input); ULN2802A (STMicroelectronics, same datasheet, 10.5 kΩ input with Zener for 14–25 V PMOS); ULN2804A (STMicroelectronics, same datasheet, 10.5 kΩ input for 6–15 V CMOS). Always verify pinout and electrical characteristics against each datasheet before substituting.

Do you have ULN2803A in stock?

Yes. PartVane holds stock of ULN2803A. Send the quantity you need and we will confirm the available quantity, date code and delivery in the quotation.

How do I get a price and availability for ULN2803A?

Message the owner on WhatsApp (+86 139 3944 9974), use the quote form on this page or email sales@partvane.com with the quantity and target delivery date. On WhatsApp we quote within 2 hours during business hours (Mon–Sat, 09:00–18:00 China time (UTC+8)); every RFQ is answered within 24 hours. The quotation includes unit price, availability, lead time and photos of the actual parts with the date code / lot label.

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