400W bidirectional TVS in a standard SMA footprint
The SMAJ45CA-13-F is a 400 W peak pulse power bidirectional TVS diode from Diodes Incorporated, built in the DO-214AC (SMA) surface-mount package. With a 45 V reverse standoff voltage and a minimum breakdown of 50 V, this part sits on a 45 V nominal rail — 48 V telecom buses, 36-48 V industrial supplies, or 42 V automotive systems — and begins conducting when the transient exceeds the breakdown threshold.
No last-time-buy window, no NRND flag, no successor to track. For a BOM cost engineer or allocation watcher, this means the part is still in the franchised channel and the spot market is not yet driven by scarcity — the usual allocation signals (extended lead times, premium-only availability) do not apply here today.
What the ratings mean for the board
The 400 W peak pulse power rating is the device's ability to absorb a single 10/1000 µs surge without failing. The 72.7 V clamping voltage tells the layout engineer the maximum voltage the protected IC will see across the TVS during that event — if the downstream device's abs-max rating is below 72.7 V, this clamp is not enough and a higher-power or lower-clamp part is needed. The DO-214AC (SMA) package is a standard two-lead footprint with a 0.065-inch (1.65 mm) lead pitch. Reflow profile follows the standard JEDEC MSL-1 moisture sensitivity for this package — no bake required before assembly if the shelf life has been respected. The bidirectional channel means a single device protects both positive and negative transients on the same rail — useful for AC-coupled lines or bipolar supplies where polarity is not fixed.
Sourcing posture for this line item
Available through independent and franchised distribution channels. No single-source risk — the SMAJ45CA is a standard JEDEC-registered part number produced by multiple manufacturers, so a second-source cross-reference is straightforward for a buyer managing allocation risk.