# U3210

**UNI SEMIC** · DC-DC Converters · SOP-8

U3210 from UNI SEMIC, in a SOP-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 | VDD | power_in | Chip supply pin, also used as the output-voltage feedback input when FB is left floating; the datasheet recommends a 100nF SMD capacitor, VDD_ON is 7.5V typ, VDD_OFF 7.0V typ, VDD_OVP 25V typ, and VDD is clamped at 27V typ at 10mA, with an absolute maximum VDD supply of 25V. |
| 2 | GND | power_in | Reference ground for the chip. |
| 3 | FB | input | Feedback input; when left floating the output defaults to 12V, the reference is 2.0V typ, the output overvoltage threshold is 2.4V typ and the overload threshold VFB_OLP is 1.87V typ, with an absolute FB/CS voltage range of -0.3 to 7V. |
| 4 | CS | output | Peak current sense pin, where the cycle-by-cycle peak current threshold is 0.55V typ (0.50 to 0.60V) and the abnormal overcurrent threshold is 0.9V typ, with an absolute FB/CS voltage range of -0.3 to 7V. |
| 5 | Drain | power_in | Drain of the internal high-voltage power MOSFET, rated for a 650V minimum breakdown voltage and an absolute maximum drain voltage of -0.3 to 650V, with typical Rdson of 10 Ω. |
| 6 | Drain | power_in | Drain of the internal high-voltage power MOSFET, rated for a 650V minimum breakdown voltage and an absolute maximum drain voltage of -0.3 to 650V, with typical Rdson of 10 Ω. |
| 7 | Drain | power_in | Drain of the internal high-voltage power MOSFET, rated for a 650V minimum breakdown voltage and an absolute maximum drain voltage of -0.3 to 650V, with typical Rdson of 10 Ω. |
| 8 | Drain | power_in | Drain of the internal high-voltage power MOSFET, rated for a 650V minimum breakdown voltage and an absolute maximum drain voltage of -0.3 to 650V, with typical Rdson of 10 Ω. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UNI SEMIC |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| HV pin supply current (IHV) | IHV | 1 | 5 |  | mA | HV=650V, VDD=0V | 5 |
| VDD start-up current | IVDD_st |  | 100 | 300 | uA | 无开关工作 | 5 |
| Internal reference voltage at FB (differential amplifier input) | VFB_REF | 1.97 | 2 | 2.03 | V |  | 6 |
| Peak current threshold | VIPK | 0.5 | 0.55 | 0.6 | V |  | 6 |
| Power MOSFET breakdown voltage | VBR | 650 |  |  | V |  | 6 |
| Drain pin voltage |  | -0.3 |  | 650 | V |  | 5 |
| VDD supply voltage | VDD |  |  | 25 | V |  | 5 |
| VDD clamp current |  |  |  | 10 | mA |  | 5 |
| FB, CS pin voltage |  | -0.3 |  | 7 | V |  | 5 |
| Maximum junction operating temperature |  |  |  | 160 | °C |  | 5 |
| Storage temperature |  | -65 |  | 150 | °C |  | 5 |
| Pin temperature (soldering, 10 s) |  |  |  | 260 | °C | 焊接 10 秒 | 5 |
| ESD capability (human body model) |  |  |  | 3 | KV | 人体模型 | 5 |
| ESD capability (machine model) |  |  |  | 250 | V | 机器模型 | 5 |
| Package thermal resistance, junction to ambient (SOP-8) |  |  | 165 |  | °C/W | 结到环境(SOP-8) | 5 |
| Operating ambient temperature |  | -40 |  | 125 | °C |  | 5 |
| Switching frequency |  | 40 |  | 60 | kHz |  | 5 |

## CAD (KiCad official)

- Symbol: `U3210`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `u3210-etched.step` / `u3210-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `u3210.step` / `u3210.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UNI SEMIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756596817666818048) (10 pp, sha256 `1dbd5e6205e22cb9`, retrieved 2026-10-18, 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-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/u3210-datasheet.pdf)