A Littelfuse TVS alternative request comes with a hard constraint: the board is frozen and the pad is fixed. That is exactly why the series name matters — SMBJ is SMB on every brand, and AMSEMI makes SMBJ in SMB. Same series, same package, same footprint, no layout change. Where Littelfuse uses a package we do not build in, we say so instead of offering the next size up.
| What you are replacing | What we offer |
|---|---|
| TVS, surface mount (SMAJ, SMBJ, SMCJ, SMDJ, 5.0SMDJ, SMF) | AMSEMI, same package |
| TVS, axial (P4KE, P6KE, 1.5KE) | AMSEMI, same package (DO-41 / DO-15 / DO-201) |
| ESD protection arrays | AMSEMI, same package |
| Fuses, PTC, varistors, gas discharge tubes | Not our line — protection is not only TVS |
| TVS arrays and custom multi-line modules | Quote only |
These series names are industry-standard — onsemi, Littelfuse, Vishay, NXP and AMSEMI all build SMAJ in SMA and SMBJ in SMB. Same name means same pad. Peak power and stand-off range are AMSEMI figures from AMSEMI datasheets.
| Series | Package | PPK (10/1000 µs) | VRWM | Availability |
|---|---|---|---|---|
| SMF | SOD-123FL | 200 W | 5–440 V | 12 bands in stock |
| P4SMF | SOD-123FL | 400 W | 6.8–250 V | Made to order |
| SMAJ | SMA | 400 W | 5–440 V | 14 bands in stock |
| SMBJ | SMB | 600 W | 5–440 V | 15 bands in stock |
| SMCJ | SMC | 1500 W | 5–440 V | 4 bands in stock |
| 1.5SMC | SMC | 1500 W | 5.8–495 V | 1 band in stock |
| SMDJ | SMC | 3000 W | 5–170 V | 13 bands in stock |
| 5.0SMDJ | SMC | 5000 W | 12–170 V | 15 bands in stock |
| 8.0SMDJ | SMC | 8000 W | 48–90 V | 3 bands in stock |
| P4KE | DO-41 | 400 W | 5.8–342 V | Made to order |
| P6KE | DO-15 | 600 W | 5.8–342 V | Made to order |
| 1.5KE | DO-201 | 1500 W | 5.8–342 V | 3 bands in stock |
| 5KP | P600 | 5000 W | — | Made to order |
Stock figures are a snapshot taken 2026-09-18 and are confirmed on the quote. Bands not held are factory orders, typically 8–10 weeks.
| AMSEMI series | Function | Packages |
|---|---|---|
| GS | Rectifier, general purpose | SMA · SMB · SMC |
| GP | Rectifier, general purpose | DO-41 |
| RL | Rectifier, general purpose | DO-15 |
| P | Rectifier, general purpose | P600 |
| SS | Schottky | SMA · SMB · SMC |
| SR | Schottky | DO-41 · DO-15 · DO-27 |
| MBR | Schottky | TO-220AB · TO-220AC |
| GR | Fast recovery | SMA · SMB · SMC |
| FR | Fast recovery | DO-41 · DO-15 · DO-27 · P600 |
| F | Fast recovery | SOD-123 |
| ES | Ultra-fast recovery | SMA · SMB · SMC |
| SF | Ultra-fast recovery | DO-41 · DO-15 · DO-27 |
| MUR | Ultra-fast recovery | TO-220AB |
| SMA / SMB / SZ | Zener | SMA · SMB |
| ESD / GESD | ESD protection | SOD-323 · SOD-523 · SOT-23 · SOT-26 · DFN1006 · DFN0603 |
| BC / MMBT / S / FMMT | Bipolar transistor | SOT-23 · SOT-323 · SOT-363 |
| AM / AMZ / AMU / BSS | Small-signal MOSFET | SOT-23 · SOT-523 · SOT-363 |
Yes. SMBJ is an industry-standard series name, the package is SMB on both sides, and the pad geometry is defined by the package, not the brand. What changes is the clamp voltage, which we publish from AMSEMI datasheets, and availability.
No. 5.0SMDJ is SMC — a physically larger pad. That is a board respin, not a replacement, and we will not dress it up as one. If you want the lower clamp of the foldback family you have to change the pad to SMC, and we will say that plainly.
Not directly. Our figures are 10/1000 µs, and the two waveforms are not convertible by a single factor. Compare percentage clamp reduction within the same waveform, or ask us for the equivalent waveform.
Yes — P4KE in DO-41, P6KE in DO-15 and 1.5KE in DO-201, up to 342 V stand-off. Stock depth on axial parts is thinner than on SMBJ / SMDJ, so confirm the quantity on the quote.
Not our line. We are a semiconductor distributor; if your BOM line is a fuse or a MOV, we will tell you we cannot help rather than substitute a TVS for it.
Stocked bands ship in 1–3 days. Non-stocked voltages and automotive grades are made to order, typically 8–10 weeks, confirmed per series and quantity.
Upload your BOM or type the number — we reply within one business day with the equivalent, the price, the package and the lead time. If we cannot supply it, or the package does not match, we say so.
Upload a BOM Email cs@intek.vip Try the cross-reference tool