LM2903DR from UMW, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	OUTA	output	Comparator A open-collector output. Requires an external pull-up resistor to VCC (or another supply). Can sink up to ~20 mA continuously; output saturation voltage typ 150 mV / max 400 mV at I_sink ≤ 4 mA.
2	INA-	input	Comparator A inverting input. Input bias current typ 25 nA (max 250 nA at 25 °C). Common-mode range extends from GND up to VCC−1.5 V. Absolute input voltage must remain ≥ −0.3 V of ground/V−.
3	INA+	input	Comparator A non-inverting input. Same electrical characteristics as INA−: bias ~25 nA typ, common-mode range 0 V to VCC−1.5 V, differential input voltage range up to VCC.
4	GND	power_in	Negative supply / ground reference (V−). For single-supply operation tie to 0 V; for split-supply operation connect to the negative rail (down to −15 V relative to V+).
5	INB+	input	Comparator B non-inverting input. Bias ~25 nA typ, common-mode range 0 V to VCC−1.5 V; must stay ≥ −0.3 V of V−.
6	INB-	input	Comparator B inverting input. Same electrical characteristics as the A-side inputs: bias ~25 nA typ, offset ±5 mV max, common-mode range 0 V to VCC−1.5 V.
7	OUTB	output	Comparator B open-collector output. Requires an external pull-up resistor. Sink current up to ~20 mA; V_OL typ 150 mV at 4 mA sink.
8	VCC	power_in	Positive supply. Single-supply range 2.0 V to 36 V, or +V rail of a split ±1.0 V to ±15 V supply. Absolute maximum 36 V (single) / ±18 V (split). Quiescent current typ 0.4 mA (1 mA max) with both comparators unloaded.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOP-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

LM2903DR
LM2903DRPT
LM2903DRPWR

CAD (KiCad official)

Symbol: LM2903DR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm2903dr.step`	122 KB	You want the bare part, or you mark your own boards.
`lm2903dr-etched.step`	1.9 MB	You want the part with `LM2903DR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 472 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: UMW datasheet (11 pp, sha256 a1043fb752b1d7b1, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF