INA128

@@ -0,0 +1,52 @@+# INA128++**Texas Instruments** · Instrumentation amplifier · SOIC-8++A precision instrumentation amplifier in SOIC-8, for pulling a small differential signal out of a noisy environment. One external resistor across the two RG pins sets the gain anywhere from 1 to 10000 (G = 1 + 50k/RG), and the three-op-amp topology gives very high common-mode rejection so shared noise on both inputs cancels. Low offset voltage and drift make it the front end for bridge sensors (load cells, pressure), thermocouples, current-shunt sensing, and biopotential measurement. A REF pin sets the output's ground reference. Runs on split supplies from plus/minus 2.25 to plus/minus 18 V.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | RG | passive | Gain-setting pin. For gains greater than 1, place a gain resistor between pin 1 and pin 8. Gain is set as G = 1 + 50kΩ/RG. Leave open for G = 1. |+| 2 | VIN- | input | Inverting (negative) analog input of the instrumentation amplifier. Input common-mode voltage range is (V-)+2V to (V+)-2V; safe input voltage is ±40V with RS = 0Ω. |+| 3 | VIN+ | input | Non-inverting (positive) analog input of the instrumentation amplifier. Input common-mode voltage range is (V-)+2V to (V+)-2V; safe input voltage is ±40V with RS = 0Ω. |+| 4 | V- | power_in | Negative supply rail. Dual-supply range ±2.25V to ±18V; single-supply operation V+ = 4.5V to 36V with V- = 0V. Decouple locally to ground. |+| 5 | REF | input | Reference input that sets the output DC reference level. Must be driven by a low-impedance source or connected directly to ground; any source impedance here directly degrades CMRR. |+| 6 | VO | output | Amplifier output. VO = G × (VIN+ - VIN-) + VREF, where G = 1 + 50kΩ/RG. Short-circuit protected to VS/2 continuously. |+| 7 | V+ | power_in | Positive supply rail. Dual-supply range ±2.25V to ±18V; single-supply 4.5V to 36V with V- = 0V. Decouple locally with a 0.1µF ceramic capacitor. |+| 8 | RG | passive | Gain-setting pin. For gains greater than 1, place a gain resistor between pin 1 and pin 8. Gain is set as G = 1 + 50kΩ/RG. Leave open for G = 1. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Instrumentation amplifier |+| Gain | 1 to 10000 (G = 1 + 50k/RG) |+| Gain set | single external resistor (RG) |+| CMRR | 120 dB at G=100 |+| Offset voltage | 50 µV max |+| Supply | ±2.25 to ±18 V |+| Quiescent current | ~700 µA |+| Package | SOIC-8 |++## Ordering variants++- `INA128UA (SOIC-8)`+- `INA128U (SOIC-8, tape & reel)`++## CAD (KiCad official)++- Symbol: `Amplifier_Instrumentation:INA128`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ina128.pdf) (42 pp, sha256 `1b13f3f996838202`, 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/ina128-datasheet.pdf)

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