Bidirectional clamping in a single axial device
The 1.5KE440CA R0G: On an AC signal line or a bipolar DC rail, one part replaces two unidirectional TVS diodes back-to-back, saving board space and bill-of-materials line items. The reverse standoff voltage is 376 V, and breakdown is guaranteed at a minimum of 418 V. The protected rail should sit below 376 V under normal operation; the device remains transparent until a transient drives the line above the breakdown threshold. This is the voltage the downstream circuitry must survive — if the protected equipment's dielectric withstand is below 602 V, a second stage or a higher-power TVS is needed.
1500 W peak pulse — sizing against the transient energy
Rated for 1500 W of peak pulse power dissipation under the standard 10/1000 µs exponential waveform, the 1.5KE440CA R0G handles the energy from a typical inductive-load dump or lightning-induced surge on a 376 V rail. The 2.5 A peak pulse current figure is the companion rating — at the clamping voltage of 602 V, the product of current and voltage equals the 1500 W rating within the waveform's time constant. The junction temperature range spans -55°C to 175°C, which covers automotive under-hood environments and industrial enclosures near hot machinery. The 175°C upper limit means the device can absorb repetitive pulses without derating the peak power as aggressively as a 150°C-rated part.
Through-hole DO-201 package — board-fit and assembly
Housed in a DO-201AA (also known as DO-27) axial-lead package, the 1.5KE440CA R0G is a through-hole device. The axial body and wire leads suit point-to-point wiring, terminal block mounting, or wave-soldered PCB layouts where the hole pattern and lead bend radius match the existing footprint. Tape-and-reel packaging is available for automated lead-forming and insertion equipment, though the axial form factor is less throughput-efficient than a surface-mount DO-214AB package for high-volume pick-and-place lines.
No power-line protection rating — secondary-side use only
The Power Line Protection field is marked No, which means this TVS is not rated or certified for primary AC mains protection per IEC 61643-11 or UL 1449. It is intended for secondary-side DC bus, signal line, or low-voltage AC transient suppression inside the equipment enclosure, not for the service entrance or branch circuit. General Purpose application classification confirms the part is suitable for a broad range of industrial, telecom, and automotive circuits where a 376 V standoff and 602 V clamp fit the rail voltage. No special screening or military qualification is claimed on this standard catalog variant.