component
U3213D
Public Unreviewedby Ray
UNI SEMIC DC-DC Converters, SOP-7. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownU3213D
UNI SEMIC · DC-DC Converters · SOP-7
U3213D from UNI SEMIC, in a SOP-7. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VDD | power_in | Chip supply pin, also serves as the output voltage feedback node when FB is left floating. Recommended 100nF ceramic decoupling capacitor. VDD regulation ~15V, VDD_OVP ~19V, internal 25V clamp. |
| 2 | EN | input | Enable input. Drive logic high (~1V typ) to enable the IC; drive logic low to disable and enter shutdown mode. |
| 3 | FB | input | Feedback input pin. Leave floating for default 15V output; otherwise tie to a resistor divider from Vout to set the regulated output voltage (V_FB OLP threshold ~0.5V). |
| 4 | CS | input | Peak current sense pin (V_iPK ~300mV threshold). Leave floating for the default 1.2A internal current limit, or connect a sense element to set a custom peak current. Datasheet labels this pin I/O 'O' but it functions as a current-sense input. |
| 5 | Drain | power_in | Drain of the internal 150V/3A high-voltage MOSFET (200V startup capable). Pins 5 and 6 are internally tied together and connect to the switching node / HV DC input in a buck topology. |
| 6 | Drain | power_in | Drain of the internal 150V/3A high-voltage MOSFET. Internally tied to pin 5; both should be connected together on the PCB for current handling and thermal dissipation. |
| 8 | GND | power_in | Chip reference ground. Pin 7 is absent in the SOP-7 package. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UNI SEMIC |
| Package | SOP-7 |
| Category | PMIC |
| Pins | 7 |
Ordering variants
Same part, different packaging or reel option.
U3213D
CAD (KiCad official)
- Symbol:
U3213D - Footprint:
Package_SO:SOIC-8-N7_3.9x4.9mm_P1.27mm - 3D model: SOP-7 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
u3213d.step |
111 KB | You want the bare part, or you mark your own boards. |
u3213d-etched.step |
1.6 MB | You want the part with U3213D already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 389 faces against 132 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI SEMIC datasheet (11 pp, sha256
16c525c46eb3e00c, retrieved 2026-08-17, 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:
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).