ULN2803G-S18-R
UTC(Unisonic Tech)
Needs validationlow risk
A strong cross-vendor alternative with identical key specs and a wider temperature range.
Best Alternatives to ULN2803AS
The ULN2803AS is a popular 8-channel Darlington driver array in a SOP-18 package, used for driving loads like relays and LEDs. Several cross-vendor alternatives exist, but require checking key parameters.
AI replacement insight
Electrical riskhigh
Using a part with incorrect input logic (e.g., ULN2804) or lower voltage rating can cause malfunction or damage.
Package risklow
SOP-18 is a standard package, but minor dimensional differences between vendors are possible.
Can it be replaced directly?
Direct replacement for ULN2803AS should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Cross-vendor ULN2803 equivalents like ULN2803G-S18-R.
Main risk
Mismatched input logic levels or output voltage ratings.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | ULN2803AS | ULN2803G-S18-R | HT62083ARWZ | ULN2804A | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOP-18 | SOP-18 | SOP-18 | SOP-18 | SOP-18 — Package matches.; HT62083ARWZ: Package matches.; ULN2804A: Package matches.; BULN2803LVS: Package matches. |
| Voltage | 50V | 50V | 50V | 50V | 50V / 20V — Output voltage matches.; HT62083ARWZ: Output voltage matches.; ULN2804A: Output voltage matches.; BULN2803LVS: Significantly lower output voltage rating. |
| Current | 500mA | 500mA | 500mA | - | 500mA — Output current matches.; HT62083ARWZ: Output current matches.; BULN2803LVS: Output current matches. |
| Temperature | 0°C to 70°C | -40°C to 85°C | -40°C to 85°C | - | -40°C to 85°C — Wider operating range.; HT62083ARWZ: Wider operating range. |
| Interface | TTL, CMOS, PMOS | - | - | 6-15V PMOS, CMOS | 6-15V PMOS, CMOS / 1.8V, TTL, CMOS — Designed for higher voltage logic inputs.; BULN2803LVS: Optimized for low voltage logic. |
| Application | ULN2803 | - | - | ULN2804 | ULN2804 — Different variant in the same family. |
Application & sourcing insights
Questions & answers
Verified drop-in options for ULN2803AS are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.