TPS3823
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TI voltage supervisor with watchdog, SOT-23-5. Fixed reset threshold, 200 ms reset, windowless watchdog. Datasheet-verified.
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markdownTPS3823
Texas Instruments · Voltage supervisor · SOT-23-5
Watches a supply rail and a microcontroller at once: it holds RESET asserted until the rail rises above a fixed threshold and a 200 ms delay elapses, and a watchdog input (WDI) must be toggled by the MCU within a time-out or the supervisor issues a reset. A manual-reset input (MR) forces a reset on command. That covers both brownout and firmware-hang recovery in one small SOT-23-5. A common companion to any microcontroller that must recover itself.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RESET | output | Active-low reset output, push-pull. Asserts low while VDD is below the negative-going threshold VIT- (e.g. 2.93 V nominal for TPS3823-33) and remains low for the delay time td (200 ms nom) after VDD rises above the threshold. Also asserts on MR pulled low or on watchdog time-out. |
| 2 | GND | power_in | Ground / device return. |
| 3 | MR | input | Manual reset input, active low. Pulling MR low forces RESET low; RESET remains asserted while MR is low and for the delay time td after MR returns high. Has an internal ~90 kOhm pullup to VDD, so it can be left unconnected or tied to VDD when unused. |
| 4 | WDI | input | Watchdog timer input. Must be toggled (rising or falling edge) within the watchdog time-out t_tout (1.6 s nominal for TPS3823) or a reset is triggered. If WDI is left floating the device internally generates pulses to prevent a watchdog reset; WDI must be driven fully high or fully low for the watchdog to detect an error. |
| 5 | VDD | power_in | Supply voltage input. Powers the device and is the monitored rail. Recommended operating range 1.1 V to 5.5 V (absolute max 6 V). Place a 0.1 uF ceramic bypass capacitor close to this pin for best threshold stability. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Voltage supervisor + watchdog |
| Threshold | Fixed (order code) |
| Reset delay | 200 ms (typ) |
| Watchdog | WDI time-out |
| Manual reset | MR input |
| Output | Active-low RESET |
| Supply | 1.1-5.5 V |
| Package | SOT-23-5 |
Ordering variants
Same part, different packaging or reel option.
TPS3823-33DBVR (3.3 V)TPS3823-50DBVR (5.0 V)TPS3823A-33DBVR (active-high reset)
CAD (KiCad official)
- Symbol:
Power_Supervisor:TPS3823-xxDBV (KiCad official) - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
tps3823-etched.step/tps3823-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tps3823.step/tps3823.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (34 pp, sha256
3351e38aaf2f0a71, retrieved 2026-08-17, tier: manufacturer) - 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).