Taiwan Semiconductor Corporation P6KE39H

Overview

P6KE39H from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode designed for primary-side overvoltage clamping in automotive and industrial power rails. It features a 39V nominal breakdown voltage (VBR min/max: 35.1V–42.9V), 31.6V stand-off voltage (VWM), 56.4V maximum clamping voltage at 11.1A peak surge current, and AEC-Q101 qualification for under-hood applications.

For engineers reviewing the P6KE39H datasheet, P6KE39H pinout, P6KE39H application, or P6KE39H equivalent, key selection criteria include clamping performance under 10/1000μs surges, junction temperature derating above 25°C, unidirectional polarity marking, and DO-204AC (DO-15) lead-form compatibility with legacy PCB footprints.

Technical Context

The P6KE39H operates as a silicon avalanche diode with fast response (<1.0ps from 0V to VBR), low dynamic impedance, and tightly controlled breakdown voltage tolerance (±5% for 'A' grade, but P6KE39H is standard grade per ordering code). Its unidirectional configuration enables asymmetric clamping-blocking reverse conduction while shunting positive transients to ground.

Thermal design relies on its 175°C maximum junction temperature and 5W steady-state power dissipation at 75°C ambient with 9.5mm lead length. The device uses a single-die DO-204AC package with pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Key Specifications

Pinout & Package

DO-204AC (DO-15) axial package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Polarity is unidirectional: cathode (banded end) connects to system ground or reference node; anode connects to protected line.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P6KE39H, SMAJ33A offers SMT compatibility but lacks automotive qualification and thermal mass, while 1.5KE39A provides superior clamping and surge margin in the same through-hole form factor-making it suitable for non-AEC designs demanding higher reliability headroom.

Availability

P6KE39H is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, DC motor drive systems, and LED lighting power supplies requiring stable component supply with AEC-Q101 assurance.

Supply support for P6KE39H 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power devices, TVS diodes, rectifiers, and MOSFETs since 1979.

The P6KE series was engineered specifically for cost-sensitive, high-reliability automotive and industrial transient suppression-balancing AEC-Q101 validation, robust DO-15 packaging, and precise clamping performance across 6.8V–440V voltage grades.

FAQ

What is the meaning of the 'H' suffix in P6KE39H?

The 'H' suffix in P6KE39H denotes AEC-Q101 qualification per the manufacturer's ordering code convention. Unlike standard P6KE39, the P6KE39H variant has undergone full automotive-grade reliability testing-including temperature cycling, high-temperature reverse bias, and ESD-making it suitable for under-hood and safety-critical vehicle subsystems. This qualification is explicitly confirmed in the P6KE Series datasheet Version P2203, Section 4 (Ordering Information).

Does P6KE39H have bidirectional capability?

No, P6KE39H is a unidirectional TVS diode. Its electrical specifications-including breakdown voltage measurement at 1 mA and clamping behavior-are defined only for forward-biased avalanche operation (anode negative relative to cathode). Bidirectional variants use 'CA' or 'C' suffixes (e.g., P6KE39CA); the 'H' suffix applies only to unidirectional AEC-Q101 versions per TSC's ordering matrix.

What is the maximum allowable surge current for P6KE39H at 85°C ambient?

At 85°C ambient, the P6KE39H's peak pulse power rating derates to approximately 420W based on the linear derating curve in Figure 2 of the datasheet. Using the 56.4V clamping voltage, this corresponds to a maximum surge current of ~7.45A (420W ÷ 56.4V). This value must be validated against actual waveform shape and duty cycle per IEC 61000-4-5 guidelines.

Can P6KE39H replace P6KE39A in a design?

P6KE39H can replace P6KE39A electrically and mechanically-both share identical DO-204AC packaging, pinout, and nominal 39V rating-but P6KE39H adds AEC-Q101 qualification while P6KE39A offers tighter ±5% VBR tolerance (37.1–41.0V vs. 35.1–42.9V). If automotive qualification is required, P6KE39H is preferred; if precision clamping threshold is critical and AEC is unnecessary, P6KE39A may be more appropriate.

What is the typical junction capacitance of P6KE39H at 0V bias?

The P6KE39H exhibits a typical junction capacitance of approximately 200 pF at 0V bias, as inferred from the family-wide capacitance curve (Figure 5) showing ~200 pF at VR = 0V for V(BR) ≈ 39V. This value increases significantly near VWM and must be considered when protecting high-speed signal lines, though the device is primarily intended for power-rail protection rather than data-line applications.