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U0138

Public Made by Adom

by adom

UNI SEMIC DC-DC Converters, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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U0138

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); u0138.step / u0138.glb are 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, 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