Made to order · IND
AEC-Q101 · to order
AMSEMI
DO-214AB (SMC)
SMDJ85CA-N
3000 W bi-directional foldback (snap-back) TVS in DO-214AB. Snap-back clamping pulls residual voltage far below a standard suppressor of the same standoff, so the downstream MOS rating can stay where it is.
Standoff VRWM
85V
Max continuous DC
Clamping VC
110.0V
@ Ipp 21.9A
Peak power Ppp
3000W
10/1000 µs, non-repetitive
QCan SMDJ85CA-N replace SMDJ85CA without changing the PCB?
Yes. SMDJ85CA-N and SMDJ85CA are the same footprint — DO-214AB (SMC), same land pattern, same reel — so the swap is a BOM change only. Standoff voltage is identical at 85 V and the breakdown window is the same, but the clamping voltage drops from 137.0 V to 110.0 V (19.7% lower) at the same 21.9A pulse current, which is what lets the downstream MOS rating stay where it is. Both are supplied by Shenzhen Intek Technology from the AMSEMI line.
Full specification as published by Anhui Amsemi Semiconductor
| Standoff voltageVRWM | 85 V Maximum continuous DC or peak operating voltage |
| Breakdown voltageVBR | 94.4–104.0V Measured at IT = 1 mA |
| Max clamping voltageVC | 110.0 V At Ipp = 21.9A, 10/1000 µs |
| Peak pulse powerPpp | 3000W (10/1000µs, non-repetitive) |
| Package | DO-214AB (SMC) DO-214AB is the JEDEC name for SMC |
| Standard pack | 3,000 pcs / reel Factory reel / box quantity — quote in whole multiples |
| Configuration | Bidirectional (CA) Cathode-to-anode pair in one package |
| Grade shipped from stock | Industrial See availability panel |
| Automotive version | Built to order, suffix -H AMSEMI holds AEC-Q101 factory qualification |
Same footprint, lower clamp standard vs foldback, same voltage grade
| Parameter | SMDJ85CA standard | SMDJ85CA-N foldback | Δ |
|---|---|---|---|
| Standoff voltage VRWM | 85 V | 85 V | same |
| Breakdown window VBR | 94.4–104V | 94.4–104.0V | same |
| Max clamping VC | 137.0 V | 110.0 V | −27.0 V (19.7%) |
| Peak pulse current Ipp | 21.9A (10/1000µs) | 21.9A | same |
| Package | SMC | DO-214AB (SMC) | identical |
Read the Δ column carefully. The 19.7% is a clamping-voltage reduction, not a
power-rating upgrade. Both devices absorb the same 10/1000 µs pulse at the same current — what
changes is how much of that energy reaches the MOSFET behind them. If a design already passes with
SMDJ85CA, it passes with SMDJ85CA-N with more margin; if it fails on clamp,
SMDJ85CA-N is the drop-in fix — no layout change, no requalification of the land pattern.
When to use it and when not to
Good fit
- BMS protection boards where the residual clamp is what sets the MOSFET rating
- Existing SMDJ85CA designs that fail a surge test on clamp voltage — swap to SMDJ85CA-N with no layout change
- Retrofit work where the land pattern is fixed and requalification is expensive
- Bus voltages up to roughly 94 V with the 85 V standoff grade
Not the right part
- Where you need more surge current — go up a power grade (SMDJ → 5.0SMDJ → 8.0SMDJ), not across the -N line
- Footprints other than DO-214AB: a smaller package is a board redesign, not a substitution
- Signal-line ESD clamping — this is a 5 kW surge device, use an ESD array instead
Questions engineers actually ask
What does the “-N” suffix mean on SMDJ85CA-N?
It marks the foldback (snap-back) version of the same voltage grade. Electrically it is the same standoff and the same breakdown window, but the clamping characteristic bends back after breakdown, so the residual voltage seen by the protected circuit is lower.
Is SMDJ85CA-N a drop-in replacement for SMDJ85CA?
Yes — same DO-214AB footprint, same land pattern, same tape and reel. The only document that changes is the BOM. Ordering SMDJ85CA-N where you previously ordered SMDJ85CA does not require a board revision.
What is the clamping voltage of SMDJ85CA-N?
110.0 V at Ipp = 21.9A on a 10/1000 µs waveform. Standoff is 85 V and the breakdown window is 94.4–104.0V.
Is it automotive grade?
The AMSEMI factory holds AEC-Q101 qualification, and automotive versions are built to order with the suffix -H. Parts shipped from stock are industrial grade. Say which grade you need in the RFQ and both are quoted.
How much is in stock right now?
No shelf stock is listed for this voltage grade — it is built to order. Send the quantity you need and stock or lead time is confirmed within one business day.
Which documents come with it?
RoHS declaration, SGS test report and REACH statement are available on request for AMSEMI parts. The datasheet for this series is provided with the quotation.
Same series
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