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INA155U
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
markdownINA155U
Texas Instruments · Instrumentation Amplifiers · SOIC-8
INA155U 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 pin: leave open for G = 10, short to pin 8 for G = 50, or place an external RG between pins 1 and 8 for 10 < G < 50, where the pin 1-to-8 connection must be low impedance (20Ω can cause a 0.2% gain error shift). |
| 2 | VIN- | power_in | Inverting signal input whose voltage must stay within the safe input range of (V-) - 0.5V to (V+) + 0.5V, with input current limited to 10mA if it swings more than 0.5V beyond the supply rails. |
| 3 | VIN+ | power_in | Non-inverting signal input whose voltage must stay within the safe input range of (V-) - 0.5V to (V+) + 0.5V, with input current limited to 10mA if it swings more than 0.5V beyond the supply rails. |
| 4 | V- | power_in | Negative power supply terminal; the INA155 is specified for a total supply of +2.7V to +5.5V and can run from single or dual supplies. |
| 5 | Ref | input | Reference terminal, normally set to VS/2, that must be driven low impedance to keep common-mode rejection good, since a 200Ω series resistance degrades CMRR to about 80dB. |
| 6 | VOUT | output | Output referred to the Ref terminal that swings to within 10mV of either rail for RL = 10kΩ, with short-circuit current of ±50mA to ground. |
| 7 | V+ | power_in | Positive power supply terminal; the INA155 is fully specified for +2.7V to +5.5V and the safe input limit is (V+) + 0.5V. |
| 8 | RG | passive | Gain-setting pin paired with pin 1: leave both open for G = 10, connect them together for G = 50, or connect an external RG between them for 10 < G < 50. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
INA155U - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
ina155u-etched.step/ina155u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ina155u.step/ina155u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (17 pp, sha256
477f3b4451cfbf8f, retrieved 2026-10-11, 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).