# LMT84

**Texas Instruments** · Temperature sensor · SC70-5

Reports temperature as an analog voltage, so an ADC reads it directly with no interface or calibration. The output falls about 5.5 mV per degree C over a -50 to 150 C range, sitting near mid-supply at room temperature, and the low 5.4 uA supply current suits battery designs. Its low output impedance drives an ADC input or a comparator without a buffer. A small, cheap analog thermometer, the SC70 sibling to the classic LM35.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Power supply ground. On the SOT/SC70 (DCK) package pin 1 is a direct connection to the back side of the die and must be tied to GND. |
| 2 | GND | power_in | Power supply ground. On the SOT/SC70 (DCK) package pin 2 is also a direct connection to the back side of the die and must be tied to GND. |
| 3 | OUT | output | Analog output. Outputs a voltage that is inversely proportional to temperature with an average sensor gain of -5.5 mV/°C. Push-pull output with ±50 µA drive capability; short-circuit protected. |
| 4 | VDD | power_in | Positive supply voltage, 1.5 V to 5.5 V. Quiescent current is 5.4 µA typical. Bypass to GND with a small ceramic capacitor close to the pin. |
| 5 | GND | power_in | Power supply ground. Tie to the system ground plane. |

## Key specifications

| Parameter | Value |
|---|---|
| Type | Analog temperature sensor (voltage output) |
| Range | -50 to 150 C |
| Output slope | -5.5 mV/C |
| Accuracy | +/-0.4 C (typ) |
| Supply current | 5.4 uA (typ) |
| Supply | 1.5-5.5 V |
| Package | SC70-5 |

## Ordering variants

Same part, different packaging or reel option.

- `LMT84DCKR (SC70-5)`
- `LMT84LP (TO-92)`
- `LMT84LPG (TO-92, bulk)`

## CAD (KiCad official)

- Symbol: `Sensor_Temperature:LMT84DCK (KiCad official)`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SC70-5 (KiCad packages3D, STEP)
- 3D model files: `lmt84-etched.step` / `lmt84-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lmt84.step` / `lmt84.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/lit/ds/symlink/lmt84.pdf) (30 pp, sha256 `ad87d637ced4b846`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lmt84-datasheet.pdf)