TPS3306-33DR

Texas Instruments · Supervisor And Reset ICs · SOIC-8

TPS3306-33DR 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	SENSE1	input	Sense voltage input 1 is monitored against its threshold VIT (4.55 V typ for TPS3306-33), and RESET stays active while it remains below that threshold.
2	SENSE2	input	Sense voltage input 2 is monitored against its threshold VIT (2.93 V typ for TPS3306-33), and RESET stays active while it remains below that threshold.
3	PFI	input	Power-fail comparator input is compared with an internal 1.25 V reference (VPFI typ 1.25 V, about 10 mV hysteresis), and it must be connected to GND if the comparator is unused.
4	GND	power_in	Ground reference; all device voltage values are specified with respect to GND.
5	RESET	output	Active-low open-drain reset output that is asserted during power-up, when a monitored supply is below its threshold, or on a watchdog time-out, with a maximum low output current of 5 mA.
6	PFO	output	Open-drain power-fail comparator output that goes low when PFI falls below 1.25 V and should be left unconnected if the comparator is unused.
7	WDI	input	Watchdog timer input that must see a low-to-high or high-to-low transition within the 0.8 s typical time-out (0.5 s to 1.2 s range), and leaving it unconnected disables the watchdog.
8	VDD	power_in	Supply voltage of 2.7 V to 6 V, with RESET defined from VDD of 1.1 V and a 0.1 µF ceramic bypass capacitor placed close to the supply terminals recommended.

Key specifications

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

CAD (KiCad official)

Symbol: TPS3306-33DR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)
3D model files: tps3306-33dr-etched.step / tps3306-33dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tps3306-33dr.step / tps3306-33dr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (22 pp, sha256 163676c69bb32671, retrieved 2026-10-11, 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

# TPS3306-33DR

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

TPS3306-33DR 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 | SENSE1 | input | Sense voltage input 1 is monitored against its threshold VIT (4.55 V typ for TPS3306-33), and RESET stays active while it remains below that threshold. |
| 2 | SENSE2 | input | Sense voltage input 2 is monitored against its threshold VIT (2.93 V typ for TPS3306-33), and RESET stays active while it remains below that threshold. |
| 3 | PFI | input | Power-fail comparator input is compared with an internal 1.25 V reference (VPFI typ 1.25 V, about 10 mV hysteresis), and it must be connected to GND if the comparator is unused. |
| 4 | GND | power_in | Ground reference; all device voltage values are specified with respect to GND. |
| 5 | RESET | output | Active-low open-drain reset output that is asserted during power-up, when a monitored supply is below its threshold, or on a watchdog time-out, with a maximum low output current of 5 mA. |
| 6 | PFO | output | Open-drain power-fail comparator output that goes low when PFI falls below 1.25 V and should be left unconnected if the comparator is unused. |
| 7 | WDI | input | Watchdog timer input that must see a low-to-high or high-to-low transition within the 0.8 s typical time-out (0.5 s to 1.2 s range), and leaving it unconnected disables the watchdog. |
| 8 | VDD | power_in | Supply voltage of 2.7 V to 6 V, with RESET defined from VDD of 1.1 V and a 0.1 µF ceramic bypass capacitor placed close to the supply terminals recommended. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TPS3306-33DR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `tps3306-33dr-etched.step` / `tps3306-33dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps3306-33dr.step` / `tps3306-33dr.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/tps3306) (22 pp, sha256 `163676c69bb32671`, retrieved 2026-10-11, 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/tps3306-33dr-datasheet.pdf)