KBPC2508W - Solid State Inc.
$2.19 / ea
3 in stock — maximum per order · 3–4 days lead time
Full Technical Specifications
11 Parameters| Parameter / Attribute | Specification / Value |
|---|---|
| Series | KBPC25 |
| Diode type | Single Phase |
| Mounting | Through Hole |
| Voltage - peak reverse | 800 V |
| Voltage - forward (Vf) (Max) @ if | 1.2 V @ 12.5 A |
| Current - reverse leakage @ vr | 10 µA @ 800 V |
| Current - average rectified | 25 A |
| Operating temperature | -65°C ~ 150°C (TJ) |
| Package | Bulk |
| Technology | Standard |
| Case | 4-Square, KBPC-W |
Need Stock or a Drop-in Second-Source for KBPC2508W?
Package: KBPC (metal case, lug terminals) / KBPC-W (wire leads) · Pin-compatible replacements with immediate Shenzhen spot stock
The KBPC case - a metal block with lug terminals, bolted to a chassis - is the front-end rectifier of welders, battery chargers, PSUs and motor drives, and the KBPC35 row is the middle of the ladder: 35A average output, 50V to 1000V by suffix, 300-500A of surge, and a wire-lead W variant for board mounting. The substitution arithmetic around it is unusually clean (current by the first digits, voltage by the last) and unusually physical: at 35A the bridge burns tens of watts, so the mounting torque and the chassis are as much a part of the part as the silicon - and the ones that die young usually die of inrush, not of rating.
Verified Pin-Compatible Replacements (3 verified alternatives)
The 25A Step With the Voltage Kept
Shenzhen Spot Stock (24-48h Dispatch)
The 25A member at the same 1000V class: same case, same lugs, lower current - the honest substitution only after the working current is measured, not the nameplate read.
Same 1000V blocking as the 3510 - the step down is current only, which is the cleaner direction when the voltage class is the constraint.
The Wire-Lead Body for Board Mounting
Shenzhen Spot Stock (24-48h Dispatch)
The same die and ratings in the W body: wire leads instead of lug terminals, for boards where the bridge is soldered down instead of bolted down.
Identical ratings to the lug version.
The 50A Rung for Surge-Hungry Loads
Shenzhen Spot Stock (24-48h Dispatch)
The 50A member of the same case family at the same 1000V class: more silicon behind the same footprint - the sizing move for welders and charger banks where surge, not average current, kept killing the bridge.
Same 1000V class; the surge budget grows with the die.
Buyer & Quality Checklist for Sourcing Alternatives
- Read the digits as two numbers: the first pair is the current row (KBPC10/15/25/35/50), the suffix is the voltage class - 35005 is 50V, 3506 is 600V, 3508 is 800V, 3510 is 1000V. The -W at the end means wire leads instead of lug terminals.
- The 35A rating lives at a case temperature near 50C with the bridge bolted to metal: the mounting torque and the chassis surface ARE the specification. A bridge hanging in still air is a fraction of the number on the label.
- Capacitive-load derating is real and compounding: about 20 percent comes off the output rating for the charger/PSU case before any safety margin - do repair arithmetic on the actual load current.
- The conduction loss is the heat: roughly two diode drops (about 2.2V total) in the path at full current means tens of watts in the block. Thermal grease, flat mounting and an unbent case belong to every replacement.
- Died-on-first-plug is an inrush story, not a rating story: the 300-500A surge budget exists for it, but the upstream soft-start, thermistor or pre-charge path is what actually saves the bridge. Check it before sizing up.
- Second sources share the outline, not necessarily the engineering: the case-to-lead isolation (about 2500V per datasheet) and the derating curves vary by maker. For repair stock, buy lots whose marking and provenance are photographed.
Frequently Asked Technical Questions
Q: What do the numbers in KBPC3510 mean?
A: 35 amperes average output and a 1000V blocking class, in the KBPC lug-terminal case. The row runs KBPC10 to KBPC50 by current; the suffix digits set the voltage from 50V to 1000V; a trailing W means wire leads for board mounting.
Q: Can I replace a KBPC3510 with a KBPC2506?
A: That drops two things at once: 25A against 35A and 600V against 1000V. It works only if both the measured load current and the actual mains class stay inside the smaller part - otherwise the voltage class alone is the failure.
Q: Why does the bridge rectifier in my welder or charger keep failing?
A: Two candidates in order: heat (tens of watts at full current through a badly mounted block) and inrush (the filter capacitor bank hammering the surge rating at every power-on). Fix the mounting and the soft-start path before buying a bigger bridge.