OPA2277

@@ -0,0 +1,52 @@+# OPA2277++**Texas Instruments** · Operational amplifier · SOIC-8++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++- `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](https://www.ti.com/lit/ds/symlink/opa2277.pdf) (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](docs/opa2277-datasheet.pdf)

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