component
U0138
Public Made by Adomby adom
UNI SEMIC DC-DC Converters, SOT-23-6. 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
markdownU0138
UNI SEMIC · DC-DC Converters · SOT-23-6
U0138 from UNI SEMIC, in a SOT-23-6. 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 | BS | power_out | Bootstrap pin: a capacitor connected between SW and BS is required to form a floating supply across the high-side switch driver. |
| 2 | GND | power_in | Ground pin. |
| 3 | FB | input | Adjustable-version feedback input; connect FB to the center point of the external resistor divider (regulated feedback voltage 0.78V to 0.82V, 0.80V typical). |
| 4 | EN | input | Drive to a logic-high to enable the IC and to a logic-low to disable it and enter micro-power shutdown mode (EN rising threshold 1.05V to 1.25V). |
| 5 | IN | power_in | Power supply pin; input voltage range is 4V to 30V. |
| 6 | SW | output | Switching pin; the switch node, with VSW limited to -0.3V to (VIN+0.5)V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UNI SEMIC |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | 4 | 30 | V | 4 | |||
| Supply Current in Operation | 0.4 | 0.6 | mA | VEN=3.0V, VFB=1.1V | 4 | ||
| Supply Current in Shutdown | 4 | μA | VEN =0 or EN = GND | 4 | |||
| Regulated Feedback Voltage | 0.78 | 0.8 | 0.82 | V | TA = 25°C, 4V≤VIN ≤18V | 4 | |
| High-Side Switch Leakage Current | 1 | uA | VEN=0V, VSW=12V | 4 | |||
| Oscillation Frequency | 1.2 | 1.4 | 1.6 | MHz | 4 | ||
| Maximum Duty Cycle | 90 | 95 | % | VFB=0.807V | 4 | ||
| EN up Threshold | 1.05 | 1.15 | 1.25 | V | VEN-Rising | 4 | |
| VIN, EN Voltage | -0.3 | 36 | V | 4 | |||
| VSW Voltage | -0.3 | V | 4 | ||||
| VFB Voltages | -0.3 | 6 | V | 4 | |||
| Operating Temperature Range | -40 | 85 | °C | 4 | |||
| Storage Temperature Range | -65 | 150 | °C | 4 | |||
| Lead Temperature (Soldering, 10s) | 300 | °C | Soldering, 10s | 4 | |||
| Junction Temperature | 125 | °C | 4 | ||||
| ESD (Human Body Model) | HMB | 2 | KV | 4 | |||
| ESD (Machine Model) | MM | 200 | V | 4 | |||
| Thermal Resistance Junction to Ambient | RθJA | 105 | °C/W | 4 | |||
| Thermal Resistance Junction to Case | RθJC | 35 | °C/W | 4 |
CAD (KiCad official)
- Symbol:
U0138 - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
u0138-etched.step/u0138-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);u0138.step/u0138.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI SEMIC datasheet (12 pp, sha256
660dc3b5becdd2c3, retrieved 2026-10-19, tier: lcsc) - 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).