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Texas Instruments ULN2803ADWRG4 — Discrete Semiconductors

ULN2803ADWRG4 8 NPN Darlington Array, 50V 500mA, AEC-Q100

MPNULN2803ADWRG4
End of Life

Texas Instruments ULN2803ADWRG4, 8 NPN Darlington array, 50V Vce, 500mA per channel, AEC-Q100 automotive grade, SOIC-18 surface mount.

$1.2200Ref. price · indicative, final on quote
Texas Instruments ULN2803ADWRG4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ULN2803ADWRG4 specifications
ParameterValue
SeriesAutomotive, AEC-Q100
MountingSurface Mount
FET type8 NPN Darlington
Voltage - collector emitter breakdown50V
Current - collector (Ic)500mA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case18-SOIC (0.295\", 7.50mm Width)
Vce saturation (Max) @ ib, ic1.6V @ 500µA, 350mA

Product details

Eight channels, 50 V, 500 mA — the workhorse driver

Each Darlington pair includes a base resistor and an integrated suppression diode for inductive loads, so you can drive relays, solenoids, stepper motors, or lamp banks directly from a microcontroller or logic gate without extra flyback protection.

Saturation voltage and thermal budget

At 350 mA collector current with 500 µA base drive, the Vce(sat) is 1.6 V maximum. That 1.6 V drop times the load current is the per-channel power dissipation — at 350 mA it is 0.56 W per channel, so the total eight-channel dissipation can exceed 4 W if all outputs are loaded.

Frequently asked questions

Is ULN2803ADWRG4 a direct replacement for ULN2803A?

Yes, the ULN2803ADWRG4 is pin-compatible and functionally identical to the standard ULN2803A. The key difference is the AEC-Q100 automotive qualification on this variant, which adds the temperature range and reliability testing required for automotive and harsh-environment applications. If your BOM calls for the commercial-grade ULN2803A, this part drops in electrically, but you gain the automotive rating at no electrical penalty.

What is the maximum output current per channel?

Each Darlington output is rated for 500 mA maximum continuous collector current. At 350 mA the Vce(sat) is 1.6 V typical.

Is ULN2803 compatible with 5V logic?

Yes. The ULN2803 series includes a 2.7 kΩ base resistor on each Darlington pair, so it can be driven directly from 5 V logic outputs like TTL, 5 V CMOS, or a microcontroller GPIO. The input threshold is typically 1.5 V to 2.0 V, well within 3.3 V logic swing as well, though 3.3 V drive may not saturate the output as hard at high currents.