VERIFIED CROSS-REFERENCE
SS34 alternatives & equivalent parts
3A/40V Schottky rectifier for polarity protection and freewheeling in DC-DC converters. — common packages: SMC (DO-214AB). Each candidate below cites its manufacturer datasheet; check the relationship badge before substituting.
3 verified alternatives for SS34
| Alternative | Manufacturer | Relationship | Key differences | Source |
|---|---|---|---|---|
| SK34 | Diodes Incorporated | Pin-to-pinDrop-in: same footprint and pinout. | Diodes Incorporated 3A/40V Schottky in SMC/DO-214AB - same electrical ratings and package as SS34; different manufacturer, so compare forward-voltage and reverse-leakage curves in the Diodes datasheet before substitution. | Diodes 官方页面 |
| STPS340S | STMicroelectronics | Pin-to-pinDrop-in: same footprint and pinout. | ST 3A/40V Schottky in SMC (DO-214AB); forward voltage up to 0.63V at 3A - validate conduction losses and thermal derating against the ST datasheet; third-party mirror of official datasheet. | 数据手册（第三方托管，购买前请核对原厂） |
| 1N5822-E3/54 | Vishay | FunctionalSame function: board or design change needed. | Vishay 3A/40V Schottky but in through-hole DO-201AD - no SMD footprint, PCB redesign required; third-party mirror of official datasheet. | 数据手册（第三方托管，购买前请核对原厂） |
Pre-replacement checklist
- Match the SMC/DO-214AB land pattern and cathode-band orientation for SK34 or STPS340S.
- Compare VF/IR and thermal derating curves between SS34 and the candidate in the datasheets.
- Re-run surge and temperature-rise tests; the 1N5822 needs a through-hole footprint and lead forming.
Need the exact lot, date code or a second source quoted?
Send the original MPN and the approved alternative. Sourceics reconfirms source, stock, date code and commercial terms before any order — no substitution without your engineering approval.
Request a quote for SS34Source part reference: 数据手册（第三方托管，购买前请核对原厂）. Equivalence notes are reference guidance, not a guarantee of fit — always verify against your schematic and layout.