# TPS2421-1DDAR

**Texas Instruments** · Supervisor And Reset ICs · SO-8

TPS2421-1DDAR from Texas Instruments, in a SO-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 | FLT | output | Fault low indicated the fault time has expired and the FET is switched off |
| 2 | EN | input | Device is enabled when this pin is pulled low |
| 3 | VIN | power_in | Power In and control supply voltage |
| 4 | GND | power_in | GND |
| 5 | ISET | bidirectional | A resistor to ground sets the fault current, the current limit is 150% of the fault current |
| 6 | CT | bidirectional | A capacitor to ground sets the fault time |
| 7 | VOUT | power_out | Output to the load |
| 8 | PG | output | Power Good low represents the output voltage is within 300 mV of the input voltage |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `TPS2421-1DDAR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `tps2421-1ddar-etched.step` / `tps2421-1ddar-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps2421-1ddar.step` / `tps2421-1ddar.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/tps2421-1) (35 pp, sha256 `ab2cf03f01620f54`, retrieved 2026-10-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/tps2421-1ddar-datasheet.pdf)