1.5 kW pulse rating in a DO-201 axial package
The 1.5KE440CAHB0G: The 376 V reverse standoff voltage means it sits across a 375 VDC rail without conducting leakage; the 602 V clamping voltage at 2.5 A peak pulse current defines the maximum transient voltage the downstream circuitry sees before the diode clamps.
Breakdown and clamping — the fit decision
Minimum breakdown voltage is 418 V. For a 375 V nominal rail with 10 % tolerance, the rail sits at 412.5 V worst-case high — still below the 418 V breakdown threshold, so the diode stays off during normal operation. The 602 V maximum clamping voltage means a 2.5 A transient is clamped to 602 V, which is the voltage the downstream capacitor and rectifier must survive. The bidirectional configuration clamps both polarities with a single device — useful on AC-coupled data lines or DC rails where reverse-polarity transients are possible. Power line protection is marked as 'No', meaning this is a signal- or DC-rail protector, not a mains-side suppressor.
Package and board integration
Through-hole DO-201AA (DO-27) axial package with the cathode band marking the bidirectional orientation — the band is decorative on a bidirectional device, but the lead spacing matches standard 0.4-inch pitch PCB layouts. The DO-201 body is 9.1 mm long, 5.3 mm diameter; the leads are tin-plated copper, solderable per JEDEC J-STD-002. The bulk packaging means parts ship loose in an anti-static bag, not taped and reeled — factor manual insertion or a tube feeder into the assembly line. No moisture sensitivity level (MSL) rating is needed for hermetic glass-passivated junction TVS diodes in this package.
Active production — sourcing posture
Lifecycle status is Active — Taiwan Semiconductor continues to manufacture this part. The base product number 1.5KE440 covers the full family; the 'CAHB0G' suffix denotes the bidirectional, automotive-grade, bulk-pack variant.