OPA277UA from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	Offset Trim	input	Input offset voltage trim pin. Connect a 10 kΩ potentiometer between pins 1 and 8 with the wiper to V- to null the initial input offset voltage. Leave floating if the offset trim is not used.
2	-In	input	Inverting input of the operational amplifier. High-impedance analog input with input bias current of 1 nA maximum.
3	+In	input	Noninverting input of the operational amplifier. High-impedance analog input with input bias current of 1 nA maximum.
4	V-	power_in	Negative (lowest) power supply rail. Total supply range V+ to V- is ±2 V to ±18 V (4 V to 36 V single-supply). Bypass to ground with a 0.1 µF ceramic capacitor near the pin.
5	NC	unconnected	No internal connection. Can be left floating or tied to any voltage without affecting device operation.
6	Output	output	Op-amp output. Drives loads referenced to ground or between supplies; output swings to within ~1 V of each rail. Short-circuit protected.
7	V+	power_in	Positive (highest) power supply rail. Total supply range V+ to V- is ±2 V to ±18 V (4 V to 36 V single-supply). Bypass to ground with a 0.1 µF ceramic capacitor near the pin.
8	Offset Trim	input	Input offset voltage trim pin. Connect a 10 kΩ potentiometer between pins 1 and 8 with the wiper to V- to null the initial input offset voltage. Leave floating if the offset trim is not used.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

OPA277UA
OPA277UAU
OPA277UAP
OPA277UADRM
OPA277UADRBT

CAD (KiCad official)

Symbol: OPA277UA
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`opa277ua.step`	122 KB	You want the bare part, or you mark your own boards.
`opa277ua-etched.step`	1.5 MB	You want the part with `OPA277UA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 381 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Texas Instruments datasheet (42 pp, sha256 7ff51bbc8d27be41, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF