Bidirectional TVS protection for telecom rails
The 1.5SMC82CAHM3/I is an AEC-Q101-qualified bidirectional Zener-based transient voltage suppressor — a TransZorb® in Vishay's 1.5SMC family — in the DO-214AB (SMC) surface-mount package. The CA suffix marks the bidirectional configuration; the CAs protect signal rails and telecom equipment bus rails where the polarity of the transient is undefined.
Clamping voltage and the protection envelope
The reverse standoff of 70.1 V sets the working rail — the part idles below this voltage without conducting. That 113 V clamping ceiling is what the downstream circuitry must survive — select downstream components with absolute-maximum ratings above this level. Sustained or repetitive transients above this rating cause thermal runaway — the TJ ceiling is 150 °C, so thermal relief and board copper area under the SMC tab directly affect survivable event count.
Temperature grade and telecom deployment
The lower bound matters for outdoor telecom cabinets in cold climates; the upper bound defines the thermal headroom available above the worst-case ambient in a sealed enclosure. The automotive qualification (AEC-Q101) implies tighter screening and gate-life consistency than the standard industrial grade — a meaningful reliability margin for telecom infrastructure that runs unattended in remote cabinets.
Sourcing posture
Sourced to order against BOM quantity; availability and current lead time confirmed at quote. The base number 1.5SMC82 covers a range of standoff voltages in this package — if this exact code is not available, the 1.5SMC family is the cross-reference starting point.