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ULN2805A The STMicroelectronics ULN2805A is an 8-channel NPN Darlington transistor array designed for high-current TTL applications. It features a 50V output voltage and 500mA continuous output current per channel.
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ULN2805A

Available from 2 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The STMicroelectronics ULN2805A is an 8-channel NPN Darlington transistor array designed for high-current TTL applications. It features a 50V output voltage and 500mA continuous output current per channel.
✓ Total Stock: 3,919 pcs
$ Price Range: $0.99

ULN2805A Available from 2 distributors

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Components Technology Group, Inc. ✓
Non-Authorised Inventory information
2,500 pcs
On Request
2500 pcs On Request 1 On Request On Request On Request On Request On Request
Hybrid Electronics ✓
Non-Authorised Inventory information
1,419 pcs
On Request
1419 pcs On Request 1 On Request On Request 551 On Request On Request
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

ULN2805A Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Current
DC Current Gain (hFE) (Min) @ Ic, Vce
Input Capacitance
Lead Spacing
Mounting Type
Operating Temperature
Output Current
Output Voltage
Power
Supplier Device Package
Transistor Type
Vce Saturation (Max) @ Ib, Ic
Voltage
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ULN2805A Description

Short technical summary and product information.

The ULN2805A from STMicroelectronics is an 8-channel Darlington transistor array with common emitters and integral suppression diodes for inductive loads. Each channel can handle a continuous output current of 500mA and withstand up to 50V in the off state. This device is specifically designed to sink a minimum of 350mA for standard and Schottky TTL applications where higher output current is required.

 

Key electrical characteristics include a maximum collector-emitter saturation voltage of 1.6V at 500mA and a minimum DC current gain (hFE) of 1000 at 350mA and 2V. The input current for the ULN2805A is typically 0.5mA at 3V, with a maximum of 1.45mA. Input capacitance is rated at 25pF, and turn-on/turn-off delay times are a maximum of 1µs.

 

This array is supplied in a 18-lead plastic DIP package with a through-hole mounting type. The input pins are located opposite the outputs to simplify board layout. The operating temperature range is -20°C to 150°C (TJ), and it has a power dissipation rating of 2.25W. The thermal resistance junction-to-ambient is a maximum of 55°C/W.

ULN2805A Quick Information

Product Type: Darlington Array
Canonical Name: ULN2805A 8-Channel Darlington Array
Subcategory: Darlington Array

ULN2805A Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

ULN2805A Estimated Pricing

Qty Low High
1+ $0.99 $0.99

Estimated market price range - modelled values for guidance only, not live distributor offers.

ULN2805A Features

  • Eight NPN Darlington transistors in one package.
  • 50V output voltage capability.
  • 500mA continuous output current per channel.
  • Integral suppression diodes for inductive loads.
  • 18-DIP through-hole mounting package.

ULN2805A Applications

  • Driving relays, solenoids, and stepper motors.
  • Interfacing logic outputs to high-current loads.
  • Used in industrial control and automation systems.
  • Suitable for lamp and LED display drivers.
  • Ideal for hammer and print head drivers.

ULN2805A FAQs

7 frequently asked questions generated from this part’s specifications.
What is the maximum output voltage of the ULN2805A?

The maximum output voltage is 50V.

What is the continuous output current rating per channel?

The continuous output current rating is 500mA per channel.

What is the package type of the ULN2805A?

The ULN2805A is available in an 18-DIP (0.300", 7.62mm) through-hole package.

What is the operating temperature range?

The operating junction temperature range is -20°C to 150°C.

What is the minimum DC current gain (hFE) of the ULN2805A?

The minimum DC forward current gain (hFE) is 1000 at VCE = 2V and IC = 350mA.

What is the maximum collector-emitter saturation voltage?

The maximum collector-emitter saturation voltage is 1.6V at IC = 350mA and IB = 500µA.

What are the switching delay times?

Both turn-on and turn-off delay times are 1µs maximum.

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