component
INA4181A3QPWRQ1
Public Made by Adomby adom
Texas Instruments Current Sense Amplifiers, TSSOP-20. 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
markdownINA4181A3QPWRQ1
Texas Instruments · Current Sense Amplifiers · TSSOP-20
INA4181A3QPWRQ1 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 that sets the output level at zero differential input and must be held between 0 V and VS. |
| 2 | OUT1 | output | Channel 1 output voltage, which equals the reference voltage plus the gained differential sense voltage. |
| 3 | IN-1 | input | Channel 1 current-sense amplifier negative input, connected to the load side of the sense resistor for high-side sensing or the ground side for low-side sensing. |
| 4 | IN+1 | input | Channel 1 current-sense amplifier positive input, connected to the bus-voltage side of the sense resistor for high-side sensing or the load side for low-side sensing. |
| 5 | VS | power_in | Analog supply pin, operating from 2.7 V to 5.5 V. |
| 6 | IN+2 | input | Channel 2 current-sense amplifier positive input, connected to the bus-voltage side of the sense resistor for high-side sensing or the load side for low-side sensing. |
| 7 | IN-2 | input | Channel 2 current-sense amplifier negative input, connected to the load side of the sense resistor for high-side sensing or the ground side for low-side sensing. |
| 8 | OUT2 | output | Channel 2 output voltage, which equals the reference voltage plus the gained differential sense voltage. |
| 9 | REF2 | input | Channel 2 reference input that sets the output level at zero differential input and must be held between 0 V and VS. |
| 10 | NC | unconnected | No internal connection; may be left floating or connected to any voltage between VS and ground. |
| 11 | NC | unconnected | No internal connection; may be left floating or connected to any voltage between VS and ground. |
| 12 | REF3 | input | Channel 3 reference input that sets the output level at zero differential input and must be held between 0 V and VS. |
| 13 | OUT3 | output | Channel 3 output voltage, which equals the reference voltage plus the gained differential sense voltage. |
| 14 | IN-3 | input | Channel 3 current-sense amplifier negative input, connected to the load side of the sense resistor for high-side sensing or the ground side for low-side sensing. |
| 15 | IN+3 | input | Channel 3 current-sense amplifier positive input, connected to the bus-voltage side of the sense resistor for high-side sensing or the load side for low-side sensing. |
| 16 | GND | power_in | Analog ground reference for the device. |
| 17 | IN+4 | input | Channel 4 current-sense amplifier positive input, connected to the bus-voltage side of the sense resistor for high-side sensing or the load side for low-side sensing. |
| 18 | IN-4 | input | Channel 4 current-sense amplifier negative input, connected to the load side of the sense resistor for high-side sensing or the ground side for low-side sensing. |
| 19 | OUT4 | output | Channel 4 output voltage, which equals the reference voltage plus the gained differential sense voltage. |
| 20 | REF4 | input | Channel 4 reference input that sets the output level at zero differential input and must be held between 0 V and VS. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Amplifiers/Comparators |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
INA4181A3QPWRQ1 - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
ina4181a3qpwrq1-etched.step/ina4181a3qpwrq1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ina4181a3qpwrq1.step/ina4181a3qpwrq1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (57 pp, sha256
4b84b5214b961c3a, retrieved 2026-10-11, 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, 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).