# UCC2946DTR

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

UCC2946DTR 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 | GND | power_in | Ground reference for the device; all voltages are specified with respect to GND. |
| 2 | RTH | input | Reset threshold input that compares its voltage to an internal 1.25-V reference (the threshold is 1.235 V elsewhere in the datasheet), and external resistors program the reset threshold. |
| 3 | RES | output | Reset output that is high only when RTH is above 1.235 V; it stays low for the reset period after RTH rises above the threshold and asserts low if RTH dips below 1.235 V for a duration set by Figure 1. |
| 4 | RP | input | Reset period programming pin, where an external capacitor CRP sets the reset period (TRP = 3.125 × CRP, TRP in ms, CRP in nF) and is charged by a 400 nA current source. |
| 5 | WDO | output | Watchdog output that is asserted low if WDI is not strobed or toggled within the watchdog period. |
| 6 | WP | input | Watchdog period programming pin, where an external capacitor CWP sets the watchdog period (TWP = 25 × CWP, TWP in ms, CWP in nF). |
| 7 | WDI | input | Watchdog timer input that must be toggled within the watchdog period to keep WDO deasserted; the logic thresholds are VIH ≥ 0.7×VDD and VIL ≤ 0.3×VDD. |
| 8 | VDD | power_in | Supply voltage for the device, specified at 2.1 V to 5.5 V for the UCC2946 (minimum operating voltage 1.1 V where RES is valid). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `UCC2946DTR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ucc2946dtr-etched.step` / `ucc2946dtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc2946dtr.step` / `ucc2946dtr.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/ucc2946) (20 pp, sha256 `6dea29f2ee7ad735`, retrieved 2026-10-10, 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/ucc2946dtr-datasheet.pdf)