Product details

Drivers per package 8 Switching voltage (Max) (V) 50 Output voltage (Max) (V) 50 Peak output current (mA) 500 Delay time (Typ) (ns) 130 Input compatibility CMOS, TTL Vol @ lowest spec current (Typ) (mV) 900 Iout/ch (Max) (mA) 500 Iout_off (Typ) (uA) 50 Rating Catalog
Drivers per package 8 Switching voltage (Max) (V) 50 Output voltage (Max) (V) 50 Peak output current (mA) 500 Delay time (Typ) (ns) 130 Input compatibility CMOS, TTL Vol @ lowest spec current (Typ) (mV) 900 Iout/ch (Max) (mA) 500 Iout_off (Typ) (uA) 50 Rating Catalog
SOIC (DW) 18 119 mm² 11.55 x 10.3
  • 500-mA-Rated Collector Current (Single Output)
  • High-Voltage Outputs: 50 V
  • Output Clamp Diodes
  • Inputs Compatible With Various Types of Logic
  • 500-mA-Rated Collector Current (Single Output)
  • High-Voltage Outputs: 50 V
  • Output Clamp Diodes
  • Inputs Compatible With Various Types of Logic

The ULN2803A device is a 50 V, 500 mA Darlington transistor array. The device consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA. The Darlington pairs may be connected in parallel for higher current capability.

Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers. The ULN2803A device has a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.

The ULN2803A device is a 50 V, 500 mA Darlington transistor array. The device consists of eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA. The Darlington pairs may be connected in parallel for higher current capability.

Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers. The ULN2803A device has a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.

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Technical documentation

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Type Title Date
* Data sheet ULN2803A Darlington Transistor Arrays datasheet (Rev. H) 14 Feb 2017
E-book 11 Ways to Protect Your Power Path white paper 03 Jul 2019
Application note Basics of Power Switches (Rev. A) 26 Apr 2019
Application note Stepper Motor Driving with Peripheral Drivers (Rev. A) 02 Dec 2016
Application note Improved Thermal Dissipation and Energy Efficiency for Peripheral Driving 30 Oct 2014

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