Taiwan Semiconductor Corporation P6KE440A

Overview

P6KE440A from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal paths. It features a 440V nominal breakdown voltage (VBR = 418–462 V), 376V maximum standoff voltage (VWM), 602V clamping voltage at 1.04A peak surge current, and operates across –55°C to +175°C junction temperature range. It is used in industrial power supplies to protect rectifier stages and DC bus inputs against lightning-induced surges.

For engineers reviewing the P6KE440A datasheet, P6KE440A pinout, P6KE440A application, or P6KE440A equivalent, key selection criteria include clamping voltage margin relative to protected circuit's max operating voltage, surge current rating under 10/1000μs waveform, thermal derating above 25°C ambient, and DO-204AC (DO-15) package compatibility with existing PCB layouts.

Technical Context

The P6KE440A employs an avalanche breakdown mechanism to clamp transients within nanoseconds-response time <1.0 ps from 0 V to VBR-enabling effective suppression of fast-rising ESD and EFT events. Its low dynamic impedance ensures minimal voltage overshoot during 600W peak pulse dissipation.

Designed as a single-die, unidirectional device in DO-204AC (DO-15) package, it supports lead-free soldering per J-STD-002 and meets UL 94V-0 flammability requirements. Polarity is marked by cathode band; reverse leakage is ≤1 μA at 376 V.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking polarity. Leads are pure tin-plated and solderable per J-STD-002; meets JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with P6KE440A, SMAJ440A offers identical electrical specs but demands PCB redesign for SMT placement, while 1.5KE440A delivers 2.5× surge power headroom in the same through-hole footprint-ideal for mission-critical infrastructure where surge recurrence is frequent.

Availability

P6KE440A is available at Aetrix Electronics and suitable for industrial power supply input protection, DC bus overvoltage clamping, and renewable energy inverter DC link applications requiring stable component supply and long-term lifecycle support.

Supply support for P6KE440A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global AEC-Q101 qualification capabilities.

The P6KE series targets high-reliability industrial and automotive power protection, emphasizing robust surge immunity, wide temperature operation, and UL/IEC compliance for safety-critical DC systems.

FAQ

What is the maximum clamping voltage of P6KE440A under rated surge conditions?

The P6KE440A exhibits a maximum clamping voltage (VC) of 602 V when subjected to its rated peak surge current of 1.04 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuits experience no more than 602 V during full-rated transient events. The P6KE440A maintains this clamping performance across its specified junction temperature range.

Is P6KE440A suitable for bidirectional surge protection?

No, P6KE440A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single cathode band marking. For bidirectional protection, select P6KE440CA, which provides symmetrical clamping in both polarities. Using P6KE440A in reverse-biased configurations risks permanent breakdown above its 376 V standoff voltage.

What is the thermal derating behavior of P6KE440A above 25°C ambient?

P6KE440A follows a linear derating curve per Figure 2 in its datasheet: peak pulse power decreases from 600 W at 25°C to zero at 175°C junction temperature. At 75°C ambient (with 9.5 mm lead length), its steady-state power dissipation is limited to 5 W. Designers must apply thermal resistance models and ambient temperature margins to ensure TJ remains ≤175°C during repeated surge events.

Does P6KE440A meet AEC-Q101 reliability standards?

Yes, P6KE440A is AEC-Q101 qualified, as confirmed by Taiwan Semiconductor's ordering code suffix "H" (P6KE440AH) and explicit listing in the AEC-Q101 qualified product table. Units marked P6KE440A without "H" are standard industrial grade; only P6KE440AH carries full automotive qualification including stress testing for temperature cycling, humidity bias, and mechanical shock.

How does the junction capacitance of P6KE440A affect high-frequency signal lines?

P6KE440A has no published junction capacitance (CJ) value in its datasheet, and its DO-204AC construction yields typical CJ <5 pF at 0 V bias-too low to impact most power-line or low-speed control signal integrity. It is not recommended for RF or high-speed data line protection; for those applications, consider low-capacitance TVS arrays such as TPD4E001 or USB-IF compliant devices instead of P6KE440A.