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UCC3946DTR

Public Made by Adom

by adom

Texas Instruments Supervisor And Reset ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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README.md Initial commit: component/ucc3946dtr · Ray 8h ago
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UCC3946DTR

Texas Instruments · Supervisor And Reset ICs · SOIC-8

UCC3946DTR 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.
2 RTH input Compares its voltage to an internal 1.25-V reference, so external resistors can program any desired reset threshold; the application information gives the threshold as VRESET = 1.235 V × (R1 + R2) / R2.
3 RES output Reset output is high only when RTH has risen above 1.235 V, stays low for the reset period once RTH rises above the threshold, and asserts low for an amount of time set by Figure 1 if RTH dips below 1.235 V.
4 RP input Programs the reset period with an external capacitor, where TRP = 3.125 × CRP (TRP in ms, CRP in nF) and CRP is charged by a 400-nA precision source.
5 WDO output Watchdog output is asserted low if WDI is not strobed or toggled within the watchdog period, and it returns high when RES is asserted.
6 WP input Programs the watchdog period with an external capacitor, where TWP = 25 × CWP (TWP in ms, CWP in nF).
7 WDI input Input to the watchdog timer; if it is not toggled or strobed within the watchdog period, WDO is asserted (VIH min 0.7×VDD, VIL max 0.3×VDD).
8 VDD power_in Supply voltage for the device, 2.0 V to 5.5 V for the UCC3946 with a minimum operating voltage of 1.0 V where RES is considered valid.

Key specifications

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

CAD (KiCad official)

  • Symbol: UCC3946DTR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ucc3946dtr-etched.step / ucc3946dtr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ucc3946dtr.step / ucc3946dtr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (20 pp, sha256 6dea29f2ee7ad735, retrieved 2026-10-08, 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