OPA2131UA from Texas Instruments, 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	OUT A	output	Output of channel A.
2	-IN A	input	Inverting input of channel A.
3	+IN A	input	Noninverting input of channel A.
4	V-	power_in	Negative (lowest) power supply; supply range is ±4.5V to ±18V dual or 9V to 36V single.
5	+IN B	input	Noninverting input of channel B.
6	-IN B	input	Inverting input of channel B.
7	OUT B	output	Output of channel B.
8	V+	power_in	Positive (highest) power supply; supply range is ±4.5V to ±18V dual or 9V to 36V single.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Amplifiers
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, dual supply	VS	-18		18	V	Dual supply, (V+), (V-)	6
Supply voltage, single supply	VS			36	V	Single supply	6
Input current		-10		10	mA	Input pins diode-clamped to supply rails	6
Operating temperature	TA	-55		125	°C		6
Junction temperature	TJ			150	°C		6
Storage temperature	Tstg	-55		125	°C		6
Supply voltage, dual supply	VS	-4.5	15	18	V	Dual supply; printed ±4.5, ±15, ±18	6
Supply voltage, single supply	VS	9	30	36	V	Single supply	6
Ambient temperature	TA	-40		85	°C		6
Junction-to-ambient thermal resistance	RθJA		150		°C/W	D (SOIC) 8 pins	7
Junction-to-case (top) thermal resistance	RθJC(top)		52.3		°C/W	D (SOIC) 8 pins	7
Junction-to-board thermal resistance	RθJB		63.5		°C/W	D (SOIC) 8 pins	7
Junction-to-top characterization parameter	ΨJT		10.7		°C/W	D (SOIC) 8 pins	7
Junction-to-board characterization parameter	ΨJB		62.4		°C/W	D (SOIC) 8 pins	7
Input offset voltage	VOS	-1	0.2	1	mV	OPAx131UA; typ printed ±0.2	8
Input offset voltage drift	dVOS/dT	-10	2	10	μV/°C	TA = -40°C to +85°C; typ printed ±2	8
Power-supply rejection ratio	PSRR	-200	50	200	μV/V	9V ≤ VS ≤ 36V; typ printed ±50	8
Input bias current	IB	-50	5	50	pA	typ printed ±5; high-speed test at TJ = 25°C	8
Input offset current	IOS	-50	1	50	pA	typ printed ±1; high-speed test at TJ = 25°C	8
Common-mode rejection ratio	CMRR	70	80		dB	-12V ≤ VCM ≤ 11.5V	8
Open-loop voltage gain	AOL	94	110		dB	-12V ≤ VO ≤ 12V	8
Quiescent current (per amplifier)	IQ	-1.75	1.5	1.75	mA	IO = 0mA, OPAx131UA; typ printed ±1.5	8
Input voltage noise density	en		21		nV/√Hz	f = 10Hz	8
Input voltage noise density	en		16		nV/√Hz	f = 100Hz	8
Input voltage noise density	en		15		nV/√Hz	f = 1kHz	8
Input current noise density	In		3		fA/√Hz	f = 1kHz	8
Gain bandwidth product	GBW		4		MHz		8
Slew rate	SR		10		V/μs		8
Settling time 0.1%			1.5		μs	10V step, G = 1	8
Settling time 0.01%			2		μs	10V step, G = 1	8
Total harmonic distortion plus noise	THD+N		0.0008		%	f = 1kHz, G = 1, VO = 3.5Vrms	8
Short-circuit current	ISC		20		mA	printed ±20	8

CAD (KiCad official)

Symbol: OPA2131UA
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: opa2131ua-etched.step / opa2131ua-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); opa2131ua.step / opa2131ua.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (32 pp, sha256 190ddff0ca1efd1b, 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

OPA2131UA

Verified OPA2131UA

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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