1.5 kW Zener TVS – 17.1 V breakdown, axial leaded
The 1N6148A/TR is a Zener-type transient voltage suppressor from Microchip Technology, rated for 1500W (1.5kW) peak pulse power at 10/1000µs waveform. Its 17.1V minimum breakdown voltage and 13.7V reverse standoff make it a fit for clamping transients on 12V nominal DC rails — the standoff sits above the rail's normal maximum, so the diode stays out of conduction during steady-state operation. This is a single bidirectional channel, meaning it clamps both positive and negative surges without needing an anti-series pair. The 59.8A peak pulse current (Ipp) at the 25.1V clamping limit gives the surge margin for industrial and telecom line-side protection.
Through-hole B, Axial – rework and board fit
The B, Axial package is a through-hole leaded form — the body is cylindrical with wire leads exiting each end. It solders into a plated through-hole on the board and can be replaced with a standard soldering iron or a hot-air station set for leaded components; the thermal mass is low enough that a hand-solder swap is routine. Orientation is unambiguous — the cathode band marks the polarity for the unidirectional variant, though this bidirectional channel has no polarity mark.
The 175°C TJ(max) means the diode can absorb repetitive surge energy in a hot environment — useful in engine-bay or industrial oven-adjacent placements.