Dual differential comparator with open-collector outputs in a SOIC-8 package. Two independent comparators run from a single 2-36 V supply (or split ±1 to ±18 V), with a common-mode input range that includes ground. The open-collector outputs need a pull-up resistor and can wire-OR or level-shift. The default choice for threshold detection, zero-cross sensing, and simple hysteresis (Schmitt) triggers.

Pinout

Pin	Name	Type	Function
1	1OUT	output	Comparator 1 open-collector output. Requires an external pull-up resistor to VCC (typical 1 kΩ to 100 kΩ). Sinks up to 16 mA typical.
2	1IN-	input	Comparator 1 inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
3	1IN+	input	Comparator 1 non-inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
4	GND	power_in	Ground / negative supply reference (V-). Tie to 0 V for single-supply operation, or to the negative rail for split-supply operation.
5	2IN+	input	Comparator 2 non-inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
6	2IN-	input	Comparator 2 inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
7	2OUT	output	Comparator 2 open-collector output. Requires an external pull-up resistor to VCC (typical 1 kΩ to 100 kΩ). Sinks up to 16 mA typical.
8	VCC	power_in	Positive supply (V+). Single-supply: 2 V to 36 V. Split-supply: ±1 V to ±18 V. Bypass with a 0.1 µF ceramic capacitor to GND close to the pin.

Key specifications

Parameter	Value
Type	Dual differential comparator
Output	Open-collector (needs pull-up)
Supply voltage	2-36 V single (±1 to ±18 V split)
Common-mode input range	Includes ground (V-)
Response time	~1.3 µs typ
Channels	2 independent
Package	SOIC-8
Body (L×W×H)	4.9 × 3.9 × 1.75 mm

Ordering variants

Same part, different packaging or reel option.

LM393D (SOIC-8, tube)
LM393DR (SOIC-8, tape & reel)

CAD (KiCad official)

Symbol: Comparator:LM393
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D)

Provenance

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

Datasheet: Texas Instruments datasheet (56 pp, sha256 24c6b3c03dd65dfd, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF