component
INA121U
Public Made by Adomby adom
Texas Instruments Instrumentation Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownINA121U
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ina121u.step/ina121u.glbare 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, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).