INA143U

Texas Instruments · Differential Amplifiers · SOIC-8

INA143U 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	Ref	input	Output reference terminal, normally grounded; a voltage applied here is summed with the output to null offset, and its source impedance should be less than 10Ω to maintain good common-mode rejection.
2	-In	input	Inverting differential input; source impedances on the two inputs must be nearly equal, since a 5Ω mismatch degrades typical CMR to about 86 dB, and input resistors above 100Ω degrade CMR even if matched.
3	+In	input	Non-inverting differential input; source impedances must be nearly equal to the -In source for good common-mode rejection, and the common-mode input range extends beyond the supply rails.
4	V-	power_in	Negative supply: operates from dual supplies of ±2.25V to ±18V or single supply of +4.5V to +36V (absolute maximum supply V+ to V- is 36V).
5	Sense	input	Sense terminal of the internal difference amplifier (shown in the block diagram); the text does not define its function or limits.
6	Output	output	Amplifier output; with RL = 10kΩ to ground it swings to (V+) -1.5V positive and (V-) +1V negative, with continuous short-circuit current limit of -25/+32 mA and stable operation up to 1000 pF capacitive load.
7	V+	power_in	Positive supply: operates from ±2.25V to ±18V dual or +4.5V to +36V single supply.
8	NC	unconnected	No connection; leave unconnected.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	Amplifiers/Comparators
Pins	8

CAD (KiCad official)

Symbol: INA143U
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: ina143u-etched.step / ina143u-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ina143u.step / ina143u.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (22 pp, sha256 8976aa5a4a2130c8, retrieved 2026-10-08, tier: lcsc)
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

# INA143U

**Texas Instruments** · Differential Amplifiers · SOIC-8

INA143U 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 | Ref | input | Output reference terminal, normally grounded; a voltage applied here is summed with the output to null offset, and its source impedance should be less than 10Ω to maintain good common-mode rejection. |
| 2 | -In | input | Inverting differential input; source impedances on the two inputs must be nearly equal, since a 5Ω mismatch degrades typical CMR to about 86 dB, and input resistors above 100Ω degrade CMR even if matched. |
| 3 | +In | input | Non-inverting differential input; source impedances must be nearly equal to the -In source for good common-mode rejection, and the common-mode input range extends beyond the supply rails. |
| 4 | V- | power_in | Negative supply: operates from dual supplies of ±2.25V to ±18V or single supply of +4.5V to +36V (absolute maximum supply V+ to V- is 36V). |
| 5 | Sense | input | Sense terminal of the internal difference amplifier (shown in the block diagram); the text does not define its function or limits. |
| 6 | Output | output | Amplifier output; with RL = 10kΩ to ground it swings to (V+) -1.5V positive and (V-) +1V negative, with continuous short-circuit current limit of -25/+32 mA and stable operation up to 1000 pF capacitive load. |
| 7 | V+ | power_in | Positive supply: operates from ±2.25V to ±18V dual or +4.5V to +36V single supply. |
| 8 | NC | unconnected | No connection; leave unconnected. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `INA143U`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ina143u-etched.step` / `ina143u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina143u.step` / `ina143u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ina143) (22 pp, sha256 `8976aa5a4a2130c8`, retrieved 2026-10-08, tier: lcsc)
- **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](docs/ina143u-datasheet.pdf)