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INA121U

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Texas Instruments Instrumentation Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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INA121U

Texas Instruments · Instrumentation Amplifiers · SOIC-8

INA121U from Texas Instruments, in a SOIC-8. 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 RG passive Gain-setting resistor terminal; RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG (1 to 10,000 V/V), leave open for G = 1.
2 VIN- power_in Inverting input with internal over-voltage protection withstanding up to ±40V, and a ~4pA typical bias current that needs a return path.
3 VIN+ power_in Non-inverting input with internal over-voltage protection withstanding up to ±40V, and a ~4pA typical bias current that needs a return path.
4 V- power_in Negative supply, with total supply range ±2.25V to ±18V.
5 Ref input Output reference terminal, normally grounded, which must be a low-impedance connection to preserve CMR (8Ω in series degrades CMR to ~80dB at G = 1).
6 VO output Amplifier output referred to Ref, drives 1000pF capacitive load with ±14mA short-circuit current.
7 V+ power_in Positive supply, with total supply range ±2.25V to ±18V.
8 RG passive Gain-setting resistor terminal; RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Amplifiers/Comparators
Pins 8

CAD (KiCad official)

  • Symbol: INA121U
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ina121u-etched.step / ina121u-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ina121u.step / ina121u.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (22 pp, sha256 df8d2ff139ef60c7, retrieved 2026-10-07, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-4-5-20251001 (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).

Datasheet PDF