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UMW SS34B

Public Made by Adom

by adom

UMW Schottky Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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UMW SS34B

UMW · Schottky Diodes · SMB

UMW SS34B from UMW, in a SMB. 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 K passive Cathode, marked by the color band on the SMB (DO-214AA) body; SS34B is rated 40V maximum repetitive peak reverse voltage and 3.0A average forward current.
2 A passive Anode terminal of the Schottky diode; SS34B has 0.55V maximum forward voltage at 3.0A and 40V DC blocking voltage.

Key specifications

Parameter Value
Manufacturer UMW
Package SMB
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Maximum repetitive peak reverse voltage (SS34B) VRRM 40 Volts 2
Maximum RMS voltage (SS34B) VRMS 28 Volts 2
Maximum DC blocking voltage (SS34B) VDC 40 Volts 2
Maximum average forward rectified current I(AV) 3 Amps 0.375"(9.5mm) lead length (See Fig.1) 2
Peak forward surge current IFSM 80 Amps 8.3ms single half sine-wave superimposed on rated load (JEDEC method) 2
Junction temperature range TJ -65 150 °C 2
Storage temperature range TSTG -65 150 °C 2
Typical thermal resistance, junction to ambient RθJA 55 °C/W P.C.B. mounted 0.55 X 0.55"(14 X 14mm) copper pad areas (Note 2) 2
Typical thermal resistance, junction to lead RθJL 17 °C/W P.C.B. mounted 0.55 X 0.55"(14 X 14mm) copper pad areas (Note 2) 2

CAD (KiCad official)

  • Symbol: UMW SS34B
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: umw-ss34b-etched.step / umw-ss34b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); umw-ss34b.step / umw-ss34b.glb are the bare package body.

Provenance

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

  • Datasheet: UMW datasheet (6 pp, sha256 6bb9c362c0a58a8a, retrieved 2026-10-16, 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