WS3B002500V vs VMI 1N6517LL: Portable Defibrillator HV Diode
In portable defibrillator (AED / portable defibrillation) HV pulse chains, a high-voltage diode often handles rectification, clamping, or pulse shaping. Many existing BOMs lock in the U.S. VMI 1N6517LL (5000V-class HV diode). When lead time, cost, or single-source risk becomes an issue, engineering teams need a verifiable domestic / second-source path.
WS3B002500V (CETC-family SiC Schottky HV diode) publishes VRRM = 5000V, IF = 2A (TC≤75℃), and a DO-201AD package for medical electronics and high-voltage pulse supplies. This article summarizes the portable-defibrillator evaluation points and datasheet links.
Figure: Portable AED illustration (Wikimedia Commons, CC BY 3.0, Owain Davies; scene reference only, not a specific device endorsement)
Why 1N6517LL shows up in defibrillator BOMs
1N6517LL sits in VMI’s HV diode line. Jarwey product notes list about 5000V voltage class in a DO-201AD package—common where HV pulses and creepage/clearance rules matter. Once HV layout and safety approvals are frozen, purchasing often depends on that exact part number. That is when a second source or domestic alternative should be prepared, not improvised later.
Figure: 1N6517LL product photo (Jarwey catalog)
Can WS3B002500V enter the shortlist?
Per the public WS3B002500V datasheet, it is a silicon-carbide (SiC) Schottky diode that can be evaluated against 1N6517LL in the same “5000V / DO-201AD / HV pulse supply” class:
- VRRM / VR: 5000V (TC=25℃)
- Forward current IF: 2.0A (TC≤75℃); 1.0A (TC≤125℃)
- Surge IFSM: 60A (tp=8.3ms, half-sine)
- Junction temperature: -55℃ to 175℃
- Package: DO-201AD
- Typical traits: near-zero reverse recovery current, temperature-independent switching, essentially no switching losses (confirm in datasheet)
Versus classic silicon bipolar HV diodes, SiC Schottky parts often help on recovery behavior and switching loss, which can reduce heat-sink size in HV pulse supplies. Still recalculate pulse width, repetition rate, and thermal resistance before release.
Figure: WS3B002500V product photo (Jarwey catalog)
Key comparison (selection reference)
| Item | VMI 1N6517LL | WS3B002500V |
|---|---|---|
| Type | HV diode (VMI) | SiC Schottky diode |
| Voltage class | ~5000V (catalog note) | VRRM = 5000V |
| Current | See VMI / 1N6517LL datasheet | IF = 2A (TC≤75℃); IFSM = 60A |
| Recovery / switching | Check original Trr and related specs | Datasheet lists ~30ns typical trr; near-zero recovery current emphasis |
| Package | DO-201AD | DO-201AD |
| Typical use | HV pulse / medical power, etc. | Medical electronics, HV pulse supplies; portable defibrillator HV paths |
Note: This table is for shortlisting. Device physics differ (silicon HV diode vs SiC Schottky); it is not a drop-in guarantee. Confirm with latest datasheets and board-level tests.
Validation checklist for portable defibrillators
- Voltage margin & safety: Peak reverse voltage, spikes, creepage/clearance vs the safety file.
- Pulse current & thermal: Recalculate IF / IFSM and junction rise with real pulse width and PRF.
- Recovery & EMI: SiC Schottky recovery differs—recheck pulse ringing and conducted/radiated noise.
- Package & layout: Same DO-201AD family still needs pad, spacing, and heat-path checks.
- Reliability & certification: Run pilot aging, environmental, and safety regression under your QMS.
- Lead time / second source: Qualify WS3B002500V on a pilot lot before making it primary.
Datasheets and inquiry
WS3B002500V product page / datasheet
1N6517LL product page / datasheet
Summary
When VMI 1N6517LL creates lead-time or cost pressure in portable defibrillator HV pulse designs, WS3B002500V is a domestic SiC Schottky candidate in the same 5000V / DO-201AD class. Validate voltage margin, pulse thermal design, recovery/EMI, and safety regression before BOM release.
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