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INA4181A4QPWRQ1

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Texas Instruments Current Sense Amplifiers, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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INA4181A4QPWRQ1

Texas Instruments · Current Sense Amplifiers · TSSOP-20

INA4181A4QPWRQ1 from Texas Instruments, in a TSSOP-20. 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 REF1 input Channel 1 reference input; the reference voltage must be set between 0 and VS.
2 OUT1 output Channel 1 output voltage.
3 IN-1 input Channel 1 current-sense amplifier negative input; for high-side use connect to the load side of the sense resistor, and for low-side use connect to the ground side of the sense resistor.
4 IN+1 input Channel 1 current-sense amplifier positive input; for high-side use connect to the bus-voltage side of the sense resistor, and for low-side use connect to the load side. The common-mode range is -0.2 V to 26 V.
5 VS power_in Analog power supply pin, 2.7 V to 5.5 V.
6 IN+2 input Channel 2 current-sense amplifier positive input; for high-side use connect to the bus-voltage side of the sense resistor, and for low-side use connect to the load side. The common-mode range is -0.2 V to 26 V.
7 IN-2 input Channel 2 current-sense amplifier negative input; for high-side use connect to the load side of the sense resistor, and for low-side use connect to the ground side of the sense resistor.
8 OUT2 output Channel 2 output voltage.
9 REF2 input Channel 2 reference input; the reference voltage must be set between 0 and VS.
10 NC unconnected No internal connection; this pin may be left floating or connected to any voltage between VS and ground.
11 NC unconnected No internal connection; this pin may be left floating or connected to any voltage between VS and ground.
12 REF3 input Channel 3 reference input; the reference voltage must be set between 0 and VS.
13 OUT3 output Channel 3 output voltage.
14 IN-3 input Channel 3 current-sense amplifier negative input; for high-side use connect to the load side of the sense resistor, and for low-side use connect to the ground side of the sense resistor.
15 IN+3 input Channel 3 current-sense amplifier positive input; for high-side use connect to the bus-voltage side of the sense resistor, and for low-side use connect to the load side. The common-mode range is -0.2 V to 26 V.
16 GND power_in Analog ground.
17 IN+4 input Channel 4 current-sense amplifier positive input; for high-side use connect to the bus-voltage side of the sense resistor, and for low-side use connect to the load side. The common-mode range is -0.2 V to 26 V.
18 IN-4 input Channel 4 current-sense amplifier negative input; for high-side use connect to the load side of the sense resistor, and for low-side use connect to the ground side of the sense resistor.
19 OUT4 output Channel 4 output voltage.
20 REF4 input Channel 4 reference input; the reference voltage must be set between 0 and VS.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TSSOP-20
Category Amplifiers/Comparators
Pins 20

CAD (KiCad official)

  • Symbol: INA4181A4QPWRQ1
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: ina4181a4qpwrq1-etched.step / ina4181a4qpwrq1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ina4181a4qpwrq1.step / ina4181a4qpwrq1.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (57 pp, sha256 4b84b5214b961c3a, retrieved 2026-10-08, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (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