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UMW SS34B
Public Made by Adomby adom
UMW Schottky Diodes, SMB. 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
markdownUMW 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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);umw-ss34b.step/umw-ss34b.glbare 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, 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).