# CAT809JTBI-GT3

**onsemi** · Monitors & Reset Circuits · SOT-23-3

CAT809JTBI-GT3 from onsemi, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference pin for the device. |
| 2 | RESET | output | Active LOW push-pull reset output: RESET is asserted if VCC falls below the reset threshold and remains low for at least 140 ms after VCC rises above the reset threshold. |
| 3 | VCC | power_in | Power supply voltage that is monitored; the datasheet gives a VCC range of 1.2 V to 5.5 V over −40°C to +85°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23-3 |
| Category | Power Management ICs |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VCC Range (TA = 0°C to +70°C) | VCC | 1 |  | 5.5 | V | TA = 0°C to +70°C | 4 |
| VCC Range (TA = −40°C to +85°C) | VCC | 1.2 |  | 5.5 | V | TA = −40°C to +85°C | 4 |
| Supply Current | ICC |  | 8 | 20 | µA | TA = −40°C to +85°C, VCC < 5.5 V, J/L/M/H | 4 |
| Reset Threshold Voltage (J Threshold) | VTH | 3.93 | 4 | 4.06 | V | TA = +25°C | 4 |
| Reset Threshold Voltage (J Threshold) | VTH | 3.89 |  | 4.1 | V | TA = −40°C to +85°C | 4 |
| Reset Threshold Tempco |  |  | 30 |  | ppm/°C |  | 4 |
| VCC to Reset Delay | TD |  | 20 |  | µs | VCC = VTH to (VTH − 100 mV) | 4 |
| Reset Active Timeout Period | TR | 140 | 240 | 460 | ms | TA = −40°C to +85°C | 4 |
| RESET Output Voltage Low (open-drain CAT803 / push-pull CAT809, J/L/M/H) | VOL |  |  | 0.4 | V | VCC = VTH min, ISINK = 3.2 mA, CAT809J/L/M/H | 4 |
| RESET Output Voltage Low (all variants) | VOL |  |  | 0.3 | V | VCC > 1.0 V, ISINK = 50 µA | 4 |
| Supply Voltage (Any pin with respect to ground) |  | -0.3 |  | 6 | V | Any pin with respect to ground | 2 |
| Input Current, VCC |  |  |  | 20 | mA | Input current, VCC | 2 |
| Output Current, RESET, RESET |  |  |  | 20 | mA | Output current, RESET, RESET | 2 |
| Rate of Rise, VCC |  |  |  | 100 | V/µs | Rate of rise, VCC | 2 |
| Continuous Power Dissipation (SOT-23) |  |  |  | 320 | mW | SOT-23; derate 4 mW/°C above 70°C | 2 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| Storage Temperature Range |  | -65 |  | 105 | °C |  | 2 |
| Lead Soldering Temperature |  |  |  | 300 | °C | 10 sec | 2 |

## CAD (land: KiCad; 3D: generated from the datasheet)

- Symbol: `CAT809JTBI-GT3`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3, generated on the KiCad land (body 1.3 x 2.92 mm, terminals on the pads, 1.0050000000000001 mm tall, datasheet A, midpoint of min and max). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `cat809jtbi-gt3-etched.step` / `cat809jtbi-gt3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cat809jtbi-gt3.step` / `cat809jtbi-gt3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/cat809jtbi-gt3-d.pdf) (11 pp, sha256 `783f5e33fb6c9ef4`, retrieved 2026-11-13, tier: manufacturer)
- **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:** land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).

[Datasheet PDF](docs/cat809jtbi-gt3-datasheet.pdf)