component
U323
Public Made by Adomby adom
UNI SEMIC DC-DC Converters, SOP-8. Pinout cross-checked by two models against the datasheet, 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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README
markdownU323
UNI SEMIC · DC-DC Converters · SOP-8
U323 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; the datasheet rates VDD supply voltage at 25 V max, VDD clamp current at 10 mA, VDD clamp voltage at 30 V (typ), and VDD overvoltage protection threshold at 28 V (typ). |
| 2 | GND | power_in | Chip reference ground for the device. |
| 3 | EN | input | Enable input: driving it to logic high (stated as "1V" in the datasheet) enables the IC, and driving it to logic low puts the IC into shutdown mode; the pin voltage is rated -0.3 V to 7 V. |
| 4 | FB | input | Feedback input used for output voltage regulation and overload protection, with an OLP detection threshold of 1.8 V (typ); the pin voltage is rated -0.3 V to 7 V. |
| 5 | CS | output | Peak current detection pin that sets the internal peak current threshold (0.2 V typ) and abnormal overcurrent threshold (0.4 V typ); the pin voltage is rated -0.3 V to 7 V. |
| 6 | GATE | output | Power MOSFET drive output; the pin voltage is rated -0.3 V to 7 V. |
| 7 | NC | unconnected | Non-functional pin; leave floating in use. |
| 8 | HV | power_in | Internal high-voltage start-up and supply pin, rated -0.3 V to 200 V, that charges the VDD capacitor during start-up. |
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 voltage | -0.3 | 200 | V | 5 | |||
| VDD supply voltage | 25 | V | 5 | ||||
| VDD clamp current | 10 | mA | 5 | ||||
| FB, CS, GATE, EN pin voltage | -0.3 | 7 | V | 5 | |||
| Package thermal resistance, junction to ambient (SOP-8) | 165 | °C/W | 5 | ||||
| Maximum operating junction temperature | 160 | °C | 5 | ||||
| Storage temperature | -65 | 150 | °C | 5 | |||
| Pin temperature (soldering, 10 s) | 260 | °C | 5 | ||||
| ESD capability (human body model) | 3 | KV | 5 | ||||
| ESD capability (machine model) | 250 | V | 5 | ||||
| Operating ambient temperature | -40 | 125 | °C | 5 | |||
| HV pin supply current | IHV | 1 | 5 | mA | HV=150V, VDD=0V | 5 | |
| HV pin leakage current | IHV_leakage | 50 | uA | HV=150V, VDD=12V | 5 | ||
| VDD start-up current | IVDD_st | 100 | 300 | uA | 无开关工作 (no switching) | 5 | |
| VDD operating current | IVDD_Op | 800 | uA | Fsw=60kHz | 5 | ||
| VDD quiescent current | IVDD_Q | 200 | uA | 5 | |||
| VDD overvoltage protection threshold | VDD_OVP | 28 | V | 5 | |||
| VDD clamp voltage | VDD_Clamp | 30 | V | IVDD=10mA | 5 | ||
| Switching frequency | 80 | kHz | 5 | ||||
| Overload protection (OLP) detection threshold on FB | VFB | 1.8 | V | 6 | |||
| Overload protection delay time | TD_OLP | 100 | ms | 6 | |||
| Leading-edge blanking | TLEB | 300 | ns | 6 | |||
| Overcurrent comparator delay | TD_OCP | 100 | ns | 6 | |||
| Peak current threshold on CS | VIPK | 0.2 | V | 6 | |||
| Typical minimum off time | TOFF_min_norm | 7 | us | 6 | |||
| Typical maximum off time | TOFF_max_norm | 1.4 | ms | 6 | |||
| Maximum off time in dynamic response mode | TOFF_max_FDR | 100 | us | 6 | |||
| Maximum on time | TON_max | 25 | us | 6 | |||
| Internal soft-start time | Tss | 3 | ms | 6 | |||
| Auto-recovery delay time | TAuto_Recovery | 500 | ms | 6 | |||
| Overtemperature protection threshold | TSD | 150 | °C | Note 3 (parameter depends on actual design) | 6 |
CAD (KiCad official)
- Symbol:
U323 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
u323-etched.step/u323-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);u323.step/u323.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI SEMIC datasheet (13 pp, sha256
a870cdac11d209c2, retrieved 2026-10-09, 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, primaryclaude-haiku-5-5(text), consensusclaude-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).