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AD-UMD9N

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Changjing Digital Transistors, SOT-363. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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AD-UMD9N

Changjing · Digital Transistors · SOT-363

AD-UMD9N from Changjing, in a SOT-363. 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 E1 passive Emitter of the first digital transistor (built-in resistor type), shown at the bottom-left of the SOT-363 pin diagram.
2 B1 input Input (base through built-in input resistor R1 = 7 to 13 kΩ) of the first digital transistor, with VI(off) min 0.3 V and VI(on) max 1.4 V.
3 C2 passive Collector (output) of the second digital transistor, rated for output current IO 70 mA and peak collector current 100 mA.
4 E2 passive Emitter of the second digital transistor, shown at the top-right of the SOT-363 pin diagram.
5 B2 input Input (base through built-in input resistor R1 = 7 to 13 kΩ) of the second digital transistor, with VI(off) min 0.3 V and VI(on) max 1.4 V.
6 C1 passive Collector (output) of the first digital transistor, rated for output current IO 70 mA and peak collector current 100 mA.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-363
Category Transistors/Thyristors
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 (off) VI(off) 0.3 V VCC = 5V, IO = 100µA 2
Input voltage (on) VI(on) 1.4 V VO = 0.3V, IO = 1mA 2
Output voltage VO(on) 0.3 V IO/II = 5mA/0.25mA 2
Input current II 0.88 mA VI = 5V 2
Output current (off) IO(off) 0.5 µA VCC = 50V, VI = 0V 2
DC current gain GI 68 VO = 5V, IO = 5mA 2
Input resistance R1 7 10 13 kΩ 2
Resistance ratio R2/R1 3.7 4.7 5.7 2
Supply voltage VCC 50 V Tj = 25°C 2
Input voltage VIN -6 40 V Tj = 25°C 2
Output current IO 70 mA Tj = 25°C 2
Peak collector current ICM 100 mA Tj = 25°C 2
Maximum power dissipation PD 150 mW total 2
Operating junction and storage temperature range Tj, Tstg -55 150 °C 2
Transition frequency fT 250 MHz VO = 10V, IO = 5mA, f = 100MHz 2

CAD (KiCad official)

  • Symbol: AD-UMD9N
  • Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
  • 3D model: SOT-363 (KiCad packages3D, STEP)
  • 3D model files: ad-umd9n-etched.step / ad-umd9n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ad-umd9n.step / ad-umd9n.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (7 pp, sha256 9738810d4f85f32e, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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