MAX4081SAUA+ from Maxim Integrated, in a MSOP-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	RS+	input	Power connection to the external-sense resistor, with a common-mode input range of 4.5V to 76V.
2	VCC	power_in	Supply voltage input operating from 4.5V to 76V; decouple VCC to GND with at least a 0.1µF capacitor to bypass line transients.
3	N.C.	unconnected	No connection; there is no internal connection, so leave open or connect to ground.
4	GND	power_in	Ground reference for the device.
5	OUT	output	Voltage output; for the bidirectional MAX4081, the difference voltage (VOUT - VREF) is proportional to VSENSE and indicates the correct polarity.
6	REF1B	input	Reference voltage input that must be connected to REF1A or to GND (see the External Reference section).
7	REF1A	input	Reference voltage input; connect REF1A and REF1B to a fixed reference voltage (VREF), and VOUT equals VREF when VSENSE is zero.
8	RS-	input	Load connection to the external sense resistor.

Key specifications

Parameter	Value
Manufacturer	Maxim Integrated
Package	MSOP-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
Operating Voltage Range	VCC	4.5		76	V	Inferred from PSRR test	2
Common-Mode Range	CMVR	4.5		76	V	Inferred from CMRR test (Note 3)	2
Supply Current (MAX4081 row)	ICC		103	190	µA	VCC = VRS+ = 76V, no load	2
Leakage Current	IRS+, IRS-		0.01	2	µA	VCC = 0V, VRS+ = 76V	2
Input Bias Current	IRS+, IRS-		5	12	µA	VCC = VRS+ = 76V	2
Full-Scale Sense Voltage (MAX4081S)	VSENSE	-100		100	mV		2
Gain Accuracy, TA = +25°C	DAV	-0.6	0.1	0.6	%	VCC = VRS+ = 48V; TA = +25°C	2
Gain Accuracy, TA = -40°C to +85°C	DAV	-1		1	%	VCC = VRS+ = 48V; TA = -40°C to +85°C	2
Gain Accuracy, TA = TMIN to TMAX	DAV	-1.2		1.2	%	VCC = VRS+ = 48V; TA = TMIN to TMAX	2
Input Offset Voltage, TA = +25°C	VOS	-0.6	0.1	0.6	mV	VCC = VRS+ = 48V; TA = +25°C	2
Input Offset Voltage, TA = -40°C to +85°C	VOS	-1		1	mV	VCC = VRS+ = 48V; TA = -40°C to +85°C	2
Input Offset Voltage, TA = TMIN to TMAX	VOS	-1.2		1.2	mV	VCC = VRS+ = 48V; TA = TMIN to TMAX	2
Common-Mode Rejection Ratio	CMRR	100	124		dB	VCC = 48V, VRS+ = 4.5V to 76V	2
Power-Supply Rejection Ratio	PSRR	100	122		dB	VRS+ = 48V, VCC = 4.5V to 76V	2
OUT High Voltage (VCC, VOH)	VCC, VOH		0.15	0.27	V	VCC = 4.5V, VRS+ = 48V, VREF1A = VREF1B = 2.5V, IOUT (sourcing) = +500µA; VSENSE = 100mV (MAX4081S)	2
OUT Low Voltage	VOL		4	15	mV	VCC = VRS+ = 48V, VREF1A = VREF1B = 2.5V, VSENSE = -1000mV (for MAX4081 only); IOUT (sinking) = 10µA	3
OUT Low Voltage	VOL		23	55	mV	VCC = VRS+ = 48V, VREF1A = VREF1B = 2.5V, VSENSE = -1000mV (for MAX4081 only); IOUT (sinking) = 100µA	3
REF1A = REF1B Input Voltage Range	(VREF, VGND)	1.5		6	V	Inferred from REF1A rejection ratio, VREF1A = VREF1B	3
REF1A Input Voltage Range	(VREF1A, VGND)	3		12	V	Inferred from REF1A rejection ratio, VREF1B = VGND	3
REF1A Rejection Ratio		80	108		dB	VCC = VRS+ = 48V, VSENSE = 0V, VREF1A = VREF1B = 1.5V to 6V	3
REF/REF1A Ratio		0.497	0.5	0.503		VREF1A = 10V, VREF1B = VGND, VCC = VRS+ = 48V (Note 2)	3
Bandwidth (MAX4081F/T/S)	BW		150		kHz	VCC = VRS+ = 48V, VOUT = 2.5V	4
REF1A Input Impedance			250		kW	VREF1B = VGND	3
OUT Settling Time to 1% of Final Value			20		µs	VSENSE = 10mV to 100mV	4
Capacitive-Load Stability			500		pF	No sustained oscillations	4
Output Resistance	ROUT		0.1		W	VSENSE = 100mV	4
Power-Up Time			50		µs	VCC = VRS+ = 48V, VSENSE = 100mV (Note 9)	4
Saturation Recovery Time			50		µs	(Notes 9, 10)	4
VCC to GND	VCC	-0.3		80	V		2
RS+, RS- to GND	RS+, RS-	-0.3		80	V		2
OUT to GND	OUT	-0.3		18	V	Lesser of +18V or (VCC + 0.3V)	2
REF1A, REF1B to GND (MAX4081 only)	REF1A, REF1B	-0.3		18	V	Lesser of +18V or (VCC + 0.3V)	2
Differential Input Voltage	VRS+ - VRS-	-80		80	V		2
Current into Any Pin		-20		20	mA		2
Operating Temperature Range	TA	-40		125	°C		2
Junction Temperature	TJ			150	°C		2
Storage Temperature Range	TSTG	-65		150	°C		2
Lead Temperature (soldering, 10s)				300	°C	Soldering, 10s	2
Soldering Temperature (reflow)				260	°C	Reflow	2

CAD (KiCad official)

Symbol: MAX4081SAUA+
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)
3D model files: max4081saua-etched.step / max4081saua-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max4081saua.step / max4081saua.glb are the bare package body.

Provenance

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

Datasheet: Maxim Integrated datasheet (14 pp, sha256 1cd392785b0f1571, retrieved 2026-10-30, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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).

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MAX4081SAUA+

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