component
INA121UA
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
markdownINA121UA
Texas Instruments · Instrumentation Amplifiers · SOIC-8
INA121UA 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; external RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG (1 to 10,000 V/V). |
| 2 | V-IN | power_in | Inverting input of the instrumentation amplifier, with internal over-voltage protection to ±40V. |
| 3 | V+IN | power_in | Non-inverting input of the instrumentation amplifier, with internal over-voltage protection to ±40V. |
| 4 | V- | power_in | Negative supply; supply range is ±2.25V to ±18V. |
| 5 | Ref | input | Output reference terminal, normally grounded and must be a low-impedance connection to preserve CMR (8Ω in series degrades CMR to about 80dB at G = 1). |
| 6 | VO | output | Amplifier output, referred to the Ref pin, with short-circuit current of ±14mA. |
| 7 | V+ | power_in | Positive supply; supply range is ±2.25V to ±18V. |
| 8 | RG | passive | Gain-setting resistor terminal; external 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:
INA121UA - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
ina121ua-etched.step/ina121ua-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ina121ua.step/ina121ua.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-5-5(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).