ICBOMS
STMicroelectronics LM2903YST — Analog & Data Acquisition
Technical Documents PDF / CAD
Download Datasheet (PDF) Preview ↓
RoHS Compliant · Lead-Free EIA-481 Standard
STMicroelectronics / Analog & Data Acquisition

STMicroelectronics LM2903YST Dual Comparator, AEC-Q100

MPN LM2903YST
Active Spot Stock · 24-48h Dispatch 100% Original Sealed

STMicroelectronics LM2903YST dual general-purpose comparator, automotive AEC-Q100 qualified, open-collector rail-to-rail output, 2 V to 36 V supply, -40°C to 125°C, 8-MiniSO package.

In Stock: 1,982 pcs
MOQ: 5 pcs
Logistics: DHL / FedEx DAP (Global Express · 3-7d) Russia & CIS DDP (Door-to-Door Cleared)
Dispatch: Shenzhen / HK
Unit Price (USD)
$0.28 / pc
Direct Purchase Ready
Volume Pricing Breaks Confirmed upon quotation
5+ pcs
$0.28
50+ pcs
$0.22
150+ pcs
$0.20
500+ pcs
$0.16
Working on a production BOM or have a target unit price? Submit Target Price
Buy Now

$0.28 / ea · total $1.40

1,982 in stock — maximum per order · MOQ 5 · 3–4 days lead time

$0.22 / ea from 50 pcs
Upload Full BOM List
100% Original Sealed 45x Microscope QC 30-Day Warranty · COC USD T/T & PI · DAP/DDP
[SPEC] Essential Parameters Snapshot Full Specifications (14)
Package / Case 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supply Voltage 2V ~ 36V, ±1V ~ 18V
ALT
Facing long factory lead times or allocation on LM2903YST? Verified pin-compatible alternatives available with active Shenzhen stock and 100% solder-ready footprint match.
View Pin Alternates (3)

Full Technical Specifications

14 Parameters
LM2903YST specifications
Parameter / AttributeSpecification / Value
TypeGeneral Purpose
Output typeOpen-Collector, Rail-to-Rail
MountingSurface Mount
Voltage - input offset7mV @ 5V
Voltage - supply, single (Dual (±))2V ~ 36V, ±1V ~ 18V
Output current16mA @ 5V
Current - quiescent2.5mA
Current - input bias0.25µA @ 5V
Operating temperature-40°C ~ 125°C
GradeAutomotive
PackageTape & Reel (TR) Cut Tape (CT)
QualificationAEC-Q100
Case8-TSSOP, 8-MSOP (0.118\", 3.00mm Width)
Number of elements2
100% Footprint Match · Solder-Ready (No PCB Redesign Needed)

Need Stock or a Drop-in Second-Source for LM2903YST?

Package: DIP-8 / SOIC-8 · Pin-compatible replacements with immediate Shenzhen spot stock

Footprint Match 99%
Supply Chain & Allocation Reality:

The LM393 is the dual voltage comparator behind every threshold, window and alarm decision in instruments and industrial boards: 2V to 36V supply, ground-sensing inputs, open-collector outputs, and an 8-pin map that is identical to the LM358 op-amp pinout - the twin arrangement that makes socket-level swaps look possible and schematic-level swaps dangerous. Its family tree covers the whole repair shelf: temperature-grade siblings (LM193 / LM293 / LM2903 automotive) and the quad LM339 for four-channel boards. The two failure stories this page exists for: a comparator that stopped switching because the pull-up is missing, and an op-amp fitted into a comparator socket that saturates slowly and cannot wire-OR.

Verified Pin-Compatible Replacements (3 verified alternatives)

LM2903 TI / onsemi / STMicroelectronics DIP-8 / SOIC-8
100% Drop-in (Zero Code Change)
Availability & Target Pricing:

The Automotive Temperature Twin

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The same dual comparator qualified across the wider temperature band - the 2903 grade covers the -40C class - electrically the same part, graded for industrial extremes and under-hood duty.

Same 2V to 36V envelope; open-collector outputs with the same sink capability.

Compatibility & Drop-In Notes: Direction rule: substituting upward in temperature grade is free; a commercial LM393 in a cold-environment board ends in drift complaints, not immediate failure - read the board temperature spec first.
Package & Solder Footprint: Identical 8-pin footprint.
Shenzhen Warehouse Stock & MOQ: Stocked across the grades; one quote covers the ladder.
Request Volume Quote for LM2903 Compare LM2903YST vs LM2903 Spec Matrix
LM339 TI / onsemi / STMicroelectronics DIP-14 / SOIC-14
Functional Equivalent
Availability & Target Pricing:

The Quad Sibling - Four Channels, Different Body

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The same comparator core four times over in a 14-pin body: two channels wired in parallel match an LM393 function (open-collector outputs tie together happily), and the spare channels sit unused.

Same 2V to 36V class; the quad body moves the supply to pin 3 and ground to pin 12 - never the dual arrangement.

Compatibility & Drop-In Notes: The pinouts do not migrate: the LM393 carries V+ on 8 and GND on 4, the LM339 on 3 and 12. Both families are open-collector and microsecond-class - the differences are the body and the channel count.
Package & Solder Footprint: 14-pin; not a socket substitute for the 8-pin dual.
Shenzhen Warehouse Stock & MOQ: Stocked; the quad covers stranded-channel repairs.
Request Volume Quote for LM339 Compare LM2903YST vs LM339 Spec Matrix
LM358 TI / onsemi / STMicroelectronics DIP-8 / SOIC-8
Functional Equivalent
Availability & Target Pricing:

The Pinout Twin - A Different Species in the Socket

Shenzhen Spot Stock (24-48h Dispatch)

Electrical & Core Specs:

The op-amp that fits every hole: identical 8-pin map, push-pull output, internally compensated for linear duty - and functionally not a comparator.

3V to 32V, push-pull output limited to the supply rails.

Compatibility & Drop-In Notes: This card exists because the sockets are indistinguishable: if a repaired threshold circuit now responds late or drifts, check whether an op-amp replaced the comparator - and the reverse, a comparator in a feedback amplifier has no frequency compensation and oscillates.
Package & Solder Footprint: Same 8-pin footprint; only the schematic knows the difference.
Shenzhen Warehouse Stock & MOQ: Universal stock; match the device class to the circuit function.
Request Volume Quote for LM358 Compare LM2903YST vs LM358 Spec Matrix
Buyer & Quality Checklist for Sourcing Alternatives
  • The 8-pin map is shared: 1 out1, 2 in1-, 3 in1+, 4 GND, 5 in2+, 6 in2-, 7 out2, 8 V+ - on both the LM393 and the LM358. Nothing about the socket distinguishes a comparator from an op-amp; the schematic does.
  • Open-collector law: the LM393 output is a switch to ground and needs a pull-up (or a load) to a rail up to about 36V regardless of supply. A comparator that measures dead after repair is most often a missing pull-up or a pull-up to the wrong rail.
  • The reverse mistake is quieter: an LM393 - uncompensated, very high gain - fitted into a feedback amplifier oscillates; an LM358 fitted into a comparator node switches late and cannot drive wired-OR logic. Both pass a quick power-on test and fail the real one.
  • Temperature grades substitute freely upward (LM2903 into an LM393 socket) and carry a slow-drift risk downward - the -40C grade exists for reasons a cold warehouse finds its own way to.
  • Where the board needs a channel count the dual cannot give, the LM339 quad is the family answer - with a different 14-pin body (V+ on 3, GND on 12) that will not fit the 8-pin socket.
  • Input common mode includes ground across this whole family, which is why it dominates single-supply divider sensing: a sensing node that can swing below ground (inductive flyback, battery reversal) needs input protection, not just a substitution.
Frequently Asked Technical Questions

Q: What is the difference between the LM393 and the LM358?

A: Same 8-pin pinout, different device class: the LM393 is a dual comparator with open-collector outputs built for threshold decisions; the LM358 is a dual op-amp with a push-pull output internally compensated for linear amplification. The sockets are identical, the functions are not.

Q: Can I use an LM358 instead of an LM393 (or the reverse)?

A: Only after checking the circuit function. An op-amp in a comparator socket needs its output behavior - pull-up, wired-OR, speed - re-examined; a comparator in a linear feedback circuit has no compensation and will oscillate. If the node only needs a slow threshold, the op-amp can work; if it needs open-collector drive, nothing about the op-amp will.

Q: Why is my comparator output dead after replacement?

A: The LM393 output is open-collector: without a pull-up resistor or a load to a positive rail it reads low or floating with nothing to measure. Check the pull-up first, then the supply (2V to 36V) and the reference divider.

Technical Details & Description

Dual comparator for automotive and industrial threshold detection

Each of the two comparators sinks 16 mA at 5 V, enough to drive a logic input or an optocoupler LED directly. Maximum quiescent current is 2.5 mA for both channels, keeping the power budget tight in always-on modules. Input bias current maxes at 0.25 µA at 5 V, and input offset voltage at 7 mV at 5 V — figures that matter when the threshold is set by a high-impedance divider. The rail-to-rail input common-mode range lets the comparator sense signals near either supply rail, which is useful for zero-crossing or over-voltage detection.

Housed in an 8-MiniSO (3.00 mm width) surface-mount package, the LM2903YST fits compact PCB layouts for space-constrained ECU or sensor modules. The supplier device package is 8-MiniSO. Tape & Reel and Cut Tape options are available for production or prototype volumes.

No last-time-buy risk for ongoing BOM lines.

Frequently asked questions

Does the LM2903YST have rail-to-rail output?

The LM2903YST has an open-collector output with rail-to-rail input common-mode range. The output is open-collector, not rail-to-rail push-pull — it can sink current but requires a pull-up resistor to the desired logic voltage for a high output.

Is the LM2903YST automotive qualified?

Yes, the LM2903YST is AEC-Q100 qualified, making it suitable for automotive applications including under-hood and cabin environments.

LM2903YST
Verified Allocation
Quote