OPA4251UA from Texas Instruments, in a SOIC-14. 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 amplifier A, which swings to within 50mV of the supply rails at RL = 100kΩ with AOL ≥ 70dB and has short-circuit current limits of -50/+4 mA in the ±15V dual/quad specification.
2	-IN A	input	Inverting input of amplifier A, whose common-mode range extends to 200mV below V- and is limited to (V+) - 0.8V at the top, with input voltages beyond the supply rails by more than 0.5V limited to 5mA.
3	+IN A	input	Non-inverting input of amplifier A, whose common-mode voltage range is (V-) - 0.2V to (V+) - 0.8V and which is diode-clamped to the supply rails.
4	V+	power_in	Positive supply, specified from +2.7V to +36V single-supply or ±1.35V to ±18V dual-supply operation, with 0.01µF ceramic bypass recommended.
5	+IN B	input	Non-inverting input of amplifier B, whose common-mode voltage range is (V-) - 0.2V to (V+) - 0.8V and which is diode-clamped to the supply rails.
6	-IN B	input	Inverting input of amplifier B, whose common-mode range extends to 200mV below V- and is limited to (V+) - 0.8V at the top, with input voltages beyond the supply rails by more than 0.5V limited to 5mA.
7	OUT B	output	Output of amplifier B, which swings to within 50mV of the supply rails at RL = 100kΩ with AOL ≥ 70dB and has short-circuit current limits of -50/+4 mA in the ±15V dual/quad specification.
8	OUT C	output	Output of amplifier C, which swings to within 50mV of the supply rails at RL = 100kΩ with AOL ≥ 70dB and has short-circuit current limits of -50/+4 mA in the ±15V dual/quad specification.
9	-IN C	input	Inverting input of amplifier C, whose common-mode range extends to 200mV below V- and is limited to (V+) - 0.8V at the top, with input voltages beyond the supply rails by more than 0.5V limited to 5mA.
10	+IN C	input	Non-inverting input of amplifier C, whose common-mode voltage range is (V-) - 0.2V to (V+) - 0.8V and which is diode-clamped to the supply rails.
11	V-	power_in	Negative supply, which is V- = 0V for single-supply operation and -1.35V to -18V in dual-supply operation.
12	+IN D	input	Non-inverting input of amplifier D, whose common-mode voltage range is (V-) - 0.2V to (V+) - 0.8V and which is diode-clamped to the supply rails.
13	-IN D	input	Inverting input of amplifier D, whose common-mode range extends to 200mV below V- and is limited to (V+) - 0.8V at the top, with input voltages beyond the supply rails by more than 0.5V limited to 5mA.
14	OUT D	output	Output of amplifier D, which swings to within 50mV of the supply rails at RL = 100kΩ with AOL ≥ 70dB and has short-circuit current limits of -50/+4 mA in the ±15V dual/quad specification.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-14
Category	Operational Amplifier/Comparator
Pins	14

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Input Offset Voltage	VOS	-250	50	250	µV		3
Input Offset Voltage (over temperature)	VOS	-300	100	300	µV	TA = -40°C to +85°C	3
Power Supply Rejection Ratio	PSRR		3	30	µV/V	VS = ±1.35V to ±18V	3
Power Supply Rejection Ratio (over temperature)	PSRR			30	µV/V	TA = -40°C to +85°C VS = ±1.35V to ±18V	3
Input Bias Current	IB		-4	-20	nA		3
Input Bias Current (over temperature)	IB			-25	nA	TA = -40°C to +85°C	3
Input Offset Current	IOS	-2	0.1	2	nA		3
Input Offset Current (over temperature)	IOS	-2		2	nA	TA = -40°C to +85°C	3
Common-Mode Rejection Ratio	CMRR	100	124		dB	VCM = -15.2V to 14.2V	3
Common-Mode Rejection Ratio (over temperature)	CMRR	100			dB	TA = -40°C to +85°C VCM = -15V to 14.2V	3
Open-Loop Voltage Gain	AOL	100	128		dB	RL = 100kΩ, VO = -14.75V to +14.75V	3
Open-Loop Voltage Gain (over temperature)	AOL	100			dB	TA = -40°C to +85°C RL = 100kΩ, VO = -14.75V to +14.75V	3
Voltage Output Swing from Rail	VO		75	250	mV	RL = 100kΩ, AOL ≥ 100dB	3
Voltage Output Swing from Rail (over temperature)	VO			250	mV	TA = -40°C to +85°C RL = 100kΩ, AOL ≥ 100dB	3
Voltage Output Swing from Rail	VO		100	300	mV	RL = 20kΩ, AOL ≥ 100dB	3
Voltage Output Swing from Rail (over temperature)	VO			300	mV	TA = -40°C to +85°C RL = 20kΩ, AOL ≥ 100dB	3
Quiescent Current (per amplifier)	IQ		27	38	µA	IO = 0	3
Quiescent Current (per amplifier, over temperature)	IQ			45	µA	TA = -40°C to +85°C IO = 0	3
Operating Voltage Range (dual supply)	VS	1.35		18	V	TA = -40°C to +85°C	3
Operating Voltage Range (single supply)	VS	2.7		36	V	TA = -40°C to +85°C	2
Specified Range		-40		85	°C		3
Operating Range		-55		125	°C		3
Storage Temperature		-55		125	°C		4
Supply Voltage V+ to V-				36	V		4
Operating Temperature		-55		125	°C		4
Junction Temperature				150	°C		4
Lead Temperature				300	°C	soldering, 10s	4
Thermal Resistance, SO-14 Surface Mount	θJA		100		°C/W	SO-14 Surface Mount	3

CAD (KiCad official)

Symbol: OPA4251UA
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)
3D model files: opa4251ua-etched.step / opa4251ua-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); opa4251ua.step / opa4251ua.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (23 pp, sha256 3649c8969bcef71c, retrieved 2026-10-30, tier: lcsc)
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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OPA4251UA

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