MAX991ESA+ from Analog Devices Inc./Maxim Integrated, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	OUTA	output	Comparator A push-pull output (MAX991) that swings rail-to-rail and sinks or sources up to 8mA loads.
2	INA-	input	Comparator A inverting input with common-mode range extending 0.25V beyond each supply rail.
3	INA+	input	Comparator A noninverting input with common-mode range extending 0.25V beyond each supply rail.
4	VEE	power_in	Negative supply voltage (ground in single-supply operation).
5	INB+	input	Comparator B noninverting input with common-mode range extending 0.25V beyond each supply rail.
6	INB-	input	Comparator B inverting input with common-mode range extending 0.25V beyond each supply rail.
7	OUTB	output	Comparator B push-pull output (MAX991) that swings rail-to-rail and sinks or sources up to 8mA loads.
8	VCC	power_in	Positive supply voltage, +2.5V to +5.5V, to be bypassed with a 0.1µF ceramic capacitor close to the pin.

Key specifications

Parameter	Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Package	SOIC-8
Category	Operational Amplifier/Comparator
Pins	8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply Voltage	VCC	2.5		5.5	V	Inferred from PSRR test	2
Supply Current per Comparator	ICC		53	80	μA	VCC = 5V, TA = +25°C	2
Supply Current per Comparator	ICC			96	μA	VCC = 5V, TA = -40°C to +85°C	2
Supply Current per Comparator	ICC		48	80	μA	VCC = 2.7V, TA = +25°C	2
Power-Supply Rejection Ratio	PSRR	55	80		dB	2.5V ≤ VCC ≤ 5.5V	2
Input Offset Voltage	VOS	-5	0.5	5	mV	Full common-mode range, TA = +25°C	2
Input Offset Voltage	VOS	-7		7	mV	Full common-mode range, TA = -40°C to +85°C	2
Input Bias Current	IB		0.001	10	nA		2
Common-Mode Rejection Ratio	CMRR	50	80		dB		2
Output-Voltage Low	VOL		0.2	0.4	V	VCC = 5V, ISINK = 8mA, TA = +25°C	2
Output-Voltage Low	VOL			0.55	V	VCC = 5V, ISINK = 8mA, TA = -40°C to +85°C	2
Output-Voltage Low	VOL		0.15	0.3	V	VCC = 2.7V, ISINK = 3.5mA, TA = +25°C	2
Output-Voltage Low	VOL			0.4	V	VCC = 2.7V, ISINK = 3.5mA, TA = -40°C to +85°C	2
Output-Voltage High	VOH	4.6	4.85		V	VCC = 5V, ISOURCE = 8mA, TA = +25°C	2
Output-Voltage High	VOH	4.45			V	VCC = 5V, ISOURCE = 8mA, TA = -40°C to +85°C	2
Output-Voltage High	VOH	2.4	2.55		V	VCC = 2.7V, ISOURCE = 3.5mA, TA = +25°C	2
Output-Voltage High	VOH	2.3			V	VCC = 2.7V, ISOURCE = 3.5mA, TA = -40°C to +85°C	2
Input Hysteresis	VHYST		2.5		mV	printed as ±2.5	2
Input Offset Current	IOS		0.5		pA		2
Input Capacitance	CIN		1		pF		2
Output Short-Circuit Current	ISC		95		mA	Sourcing or sinking, VOUT = VEE or VCC, VCC = 5V	2
Output Short-Circuit Current	ISC		35		mA	Sourcing or sinking, VOUT = VEE or VCC, VCC = 2.7V	2
OUT Rise Time	tRISE		15		ns	VCC = 5.0V, CL = 15pF	3
OUT Rise Time	tRISE		20		ns	VCC = 5.0V, CL = 50pF	3
OUT Rise Time	tRISE		40		ns	VCC = 5.0V, CL = 200pF	3
OUT Fall Time	tFALL		15		ns	VCC = 5.0V, CL = 15pF	3
OUT Fall Time	tFALL		20		ns	VCC = 5.0V, CL = 50pF	3
OUT Fall Time	tFALL		40		ns	VCC = 5.0V, CL = 200pF	3
Propagation Delay	tPD-		210		ns	CL = 15pF, VCC = 5V, 10mV overdrive	3
Propagation Delay	tPD-		120		ns	CL = 15pF, VCC = 5V, 100mV overdrive	3
Power-Up Time	tPU		25		µs		3
Supply Voltage (VCC to VEE)	VCC			6	V		2
IN_-, IN_+ to VEE		-0.3			V	upper limit (VCC + 0.3V)	2
Current into Input Pins		-20		20	mA		2
OUT_ to VEE (push-pull)		-0.3			V	MAX987/MAX991/MAX995; upper limit (VCC + 0.3V)	2
OUT_ Short-Circuit Duration to VEE or VCC				10	s		2
Operating Temperature Range		-40		85	°C		2
Storage Temperature Range		-65		150	°C		2
Lead Temperature				300	°C	soldering, 10s	2
SO-8 Power Derating			5.88		mW/°C	8-Pin SO, above +70°C	2

CAD (KiCad official)

Symbol: MAX991ESA+
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: max991esa-etched.step / max991esa-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max991esa.step / max991esa.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices Inc./Maxim Integrated datasheet (13 pp, sha256 7f93fa0ec3029a7f, retrieved 2026-10-31, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

MAX991ESA+

Verified MAX991ESA+

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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