# TPS3852H33DRBR

**Texas Instruments** · Supervisor And Reset ICs · SON-8-EP(3x3)

TPS3852H33DRBR from Texas Instruments, in a SON-8-EP(3x3). 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 | VDD | power_in | Supply voltage input with recommended operating range of 1.6 V to 6.5 V; 0.1-μF bypass capacitor recommended for noisy systems. |
| 2 | CWD | input | Programmable watchdog timeout input; connect external timing capacitor (0.1 nF to 1000 nF) to GND, or 10-kΩ resistor to VDD, or leave unconnected to select preset watchdog timeouts. |
| 3 | MR | input | Manual reset input with internal pull-up to VDD; logical low asserts RESET output for fixed reset delay (tRST). |
| 4 | GND | power_in | Ground connection pin (0 V reference). |
| 5 | SET1 | input | Watchdog disable logic input; grounding this pin disables the watchdog timer. |
| 6 | WDI | input | Watchdog input requiring falling-edge transition between lower window boundary (tWDL max) and upper window boundary (tWDU min) to prevent watchdog timeout assertion. |
| 7 | WDO | output | Open-drain watchdog output that asserts low when watchdog timeout occurs (only when RESET is high) for reset delay period (tRST); connect via 1-kΩ to 100-kΩ pull-up resistor to desired voltage rail. |
| 8 | RESET | output | Open-drain reset output that asserts low when VDD falls below undervoltage threshold (VITN) or during power-on-reset; connect via 1-kΩ to 100-kΩ pull-up resistor to desired pullup voltage rail. |
| 9 | Thermal Pad | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SON-8-EP(3x3) |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `TPS3852H33DRBR`
- Footprint: `Package_SON:WSON-8-1EP_3x3mm_P0.5mm_EP1.6x2.0mm`
- 3D model: SON-8-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `tps3852h33drbr-etched.step` / `tps3852h33drbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps3852h33drbr.step` / `tps3852h33drbr.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/tps3852) (31 pp, sha256 `e15c9895ef25fff7`, retrieved 2026-10-03, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/tps3852h33drbr-datasheet.pdf)