# UCC25800AQDGNRQ1

**TEXAS INSTRUMENTS** · Global Sourcing Parts · HVSSOP-8

UCC25800AQDGNRQ1 from TEXAS INSTRUMENTS, in a HVSSOP-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 | SYNC | input | External clock input for frequency synchronization, with the internal MOSFETs switching on the rising edge of SYNC at half the SYNC frequency and an input range of 0 V to VREG. |
| 2 | DIS/FLT | bidirectional | Disable input (active low) and fault code output; pulling it low inhibits switching, and it is pulled low by a 750-µA source during faults through a 100-kΩ internal pullup from VREG. |
| 3 | VREG | power_out | Internal regulated reference output that must be decoupled with a capacitor of 0.1 µF to 1 µF to GND, with external load kept below 1 mA. |
| 4 | OC/DT | input | Voltage on this pin sets the maximum dead time between the internal switching devices, with the Thevenin resistance measured at start-up to set the OCP level (2.5 kΩ to 22.7 kΩ recommended). |
| 5 | RT | passive | Switching frequency setting pin, where a resistor from RT to GND sets the frequency (10 kΩ minimum), and leaving it open selects the default 1.2-MHz switching frequency. |
| 6 | GND | power_in | Return for all control and power signals, and the layout should separate power and control signals. |
| 7 | SW | output | Switch node of the integrated half-bridge, which connects directly to the transformer. |
| 8 | VCC | power_in | Input for power and control of the device, specified from 9 V to 34 V, and it requires a high-frequency bypass capacitor between VCC and GND. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TEXAS INSTRUMENTS |
| Package | HVSSOP-8 |
| Category | Global Sourcing Parts |
| Pins | 9 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | • Short SYNC pin to GND when external synchronization is not used. • Minimize the current loop with high di/dt and minimize the copper area of the switch-node with high dv/dt. | 35 |

## CAD (KiCad official)

- Symbol: `UCC25800AQDGNRQ1`
- Footprint: `Package_SO:HVSSOP-8-1EP_3x3mm_P0.65mm_EP1.57x1.89mm`
- 3D model: HVSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ucc25800aqdgnrq1-etched.step` / `ucc25800aqdgnrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc25800aqdgnrq1.step` / `ucc25800aqdgnrq1.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/lit/ds/symlink/ucc25800aqdgnrq1.pdf) (44 pp, sha256 `b2931821cc7679b0`, retrieved 2026-11-02, tier: manufacturer)
- **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-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/ucc25800aqdgnrq1-datasheet.pdf)