1500W bidirectional TVS for 13V rails
The SMCJ13CA-13: This means a 13V supply line sees the surge clamped to 21.5V — well within the typical 30V abs-max of downstream 12V-rated ICs.
For a 13V rail, a 69.7A pulse lasting 1ms is the worst-case it handles before the junction temperature exceeds the 150°C TJ limit. In practice, real-world transients are shorter (8/20µs is common for ESD), so the margin is generous. The bidirectional construction means one device protects against both positive and negative surges — useful on signal lines or DC buses where polarity reversal is possible. The DO-214AB (SMC) package is the larger of the common TVS footprints, offering lower thermal resistance than the smaller SMA/SMB variants.