# LM57FPWR

**Texas Instruments** · Thermostat Switches · TSSOP-8

LM57FPWR from Texas Instruments, in a TSSOP-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 | GND | power_in | Power supply ground. |
| 2 | SENSE1 | passive | Trip-point resistor sense pin; one of two that selects the temperature at which TOVER and TOVER assert, with pin voltages limited to -0.3 V to VDD + 0.3 V. |
| 3 | SENSE2 | passive | Trip-point resistor sense pin; one of two that selects the temperature at which TOVER and TOVER assert, with pin voltages limited to -0.3 V to VDD + 0.3 V. |
| 4 | VDD | power_in | Power supply voltage, specified from 2.4 V to 5.5 V, with absolute maximum of 6 V. |
| 5 | TRIP TEST | input | Active-high test input: when low (default) VTEMP gives the temperature sensor voltage, and when high TOVER and TOVER are asserted and VTEMP outputs the trip voltage VTRIP; tie to ground if not used. |
| 6 | TOVER | output | Active-low open-drain overtemperature switch output, asserted when the measured temperature exceeds the trip point or when TRIP TEST = 1, requires an external pullup, may be left open if not used, and is rated to 6 V absolute maximum. |
| 7 | TOVER | output | Active-high push-pull overtemperature switch output, asserted when the measured temperature exceeds the trip point or when TRIP TEST = 1, may be left open if not used, and is rated to 6 V absolute maximum. |
| 8 | VTEMP | output | Analog temperature sensor output voltage (VTS when TRIP TEST = 0, VTRIP when TRIP TEST = 1), with voltage limited to -0.3 V to VDD + 0.3 V and may be left open if not used. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-8 |
| Category | Sensors |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM57FPWR`
- Footprint: `Package_SO:TSSOP-8_3x3mm_P0.65mm`
- 3D model: TSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm57fpwr-etched.step` / `lm57fpwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm57fpwr.step` / `lm57fpwr.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/lm57) (40 pp, sha256 `6dca4ac176274107`, 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`, 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/lm57fpwr-datasheet.pdf)