component

UM823TS

Public Unreviewed

by Ray

Union Semiconductor Supervisor and Reset ICs, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

markdown

UM823TS

Union Semiconductor · Supervisor and Reset ICs · SOT-23-5

UM823TS from Union Semiconductor, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 RESET output Active-low reset output. Pulses low for 200ms (tRP) when triggered and remains low while VCC is below the reset threshold or MR is a logic low. Both sources and sinks current (VOH ≥ 0.8·VCC at 1mA source, VOL ≤ 0.3V at 4mA sink). Guaranteed valid for VCC down to 1V.
2 GND power_in Ground reference for all signals.
3 MR input Active-low manual-reset input. Triggers a reset pulse when pulled below 0.3·VCC. Has an internal 52kΩ (35-75kΩ) pull-up to VCC; can be driven by TTL/CMOS logic or shorted to ground with a switch. Leave open or tie to VCC if unused. Overbar in datasheet indicates active-low.
4 WDI input Watchdog input. If WDI stays high or low longer than the watchdog timeout period (1.6s typ), the internal watchdog timer expires and a reset is triggered. The timer clears whenever RESET is asserted or WDI sees a rising or falling edge (min pulse 50ns). Leaving WDI unconnected or three-stated disables the watchdog.
5 VCC power_in Supply voltage input. Operating range 1V to 7V (1.2V to 7V over full temperature). Typical supply current 3µA (T/S/R/Z/Y versions) with MR and WDI unconnected. Absolute maximum 8.0V.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • UM823TS
  • UM823TP

CAD (KiCad official)

  • Symbol: UM823TS
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
um823ts.step 85 KB You want the bare part, or you mark your own boards.
um823ts-etched.step 1.7 MB You want the part with UM823TS already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 408 faces against 102 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Union Semiconductor datasheet (11 pp, sha256 9413e8dcc1f62525, retrieved 2026-08-17, tier: lcsc)
  • 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