Dual bipolar op-amp built for DC precision: 10 uV of input offset, 0.1 uV/C of drift, and low noise, on a wide +/-2 to +/-18 V supply. That combination suits it to buffering references, conditioning bridge and thermocouple signals, and building precision integrators where offset and drift dominate the error budget. The high supply range gives large signal headroom on split rails. A classic precision dual, the successor to the OP227, in the standard SOIC-8 pinout.

Pinout

Pin	Name	Type	Function
1	Out A	output	Output of amplifier channel A. Rail-to-rail is not supported; swing is limited to a few volts inside the supplies at the specified load.
2	-In A	input	Inverting input of amplifier channel A. High-impedance precision input with 1 nA maximum input bias current.
3	+In A	input	Noninverting input of amplifier channel A. High-impedance precision input with 1 nA maximum input bias current; common-mode range extends to within ~2 V of each supply rail.
4	V-	power_in	Negative (lowest) power supply. Operates from -2 V to -18 V relative to V+ (total supply span 4 V to 36 V). Bypass with 0.1 µF close to the pin.
5	+In B	input	Noninverting input of amplifier channel B. High-impedance precision input with 1 nA maximum input bias current.
6	-In B	input	Inverting input of amplifier channel B. High-impedance precision input with 1 nA maximum input bias current.
7	Out B	output	Output of amplifier channel B. Unity-gain stable; drives typical op-amp loads across the -18 V to +18 V supply range.
8	V+	power_in	Positive (highest) power supply. Operates from +2 V to +18 V relative to V- (total supply span 4 V to 36 V). Bypass with 0.1 µF close to the pin.

Key specifications

Parameter	Value
Type	Dual precision op-amp
Input offset	10 uV (typ)
Offset drift	0.1 uV/C
Gain-bandwidth	1 MHz
Supply	+/-2 to +/-18 V
Noise	Low (8 nV/rtHz)
Package	SOIC-8

Ordering variants

Same part, different packaging or reel option.

OPA2277UA (SOIC-8)
OPA2277PA (PDIP-8)
OPA2277AIDR (A-grade, SOIC-8)

CAD (KiCad official)

Symbol: Amplifier_Operational:OPA2277 (KiCad official)
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (43 pp, sha256 f4feb6c3cc266f39, 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