Taiwan Semiconductor Corporation P6KE43C

Overview

P6KE43C from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode designed for primary-side overvoltage clamping in DC power rails and signal lines. It features a nominal breakdown voltage of 43 V, maximum clamping voltage of 61.9 V at 10 A peak surge current, and stand-off voltage of 34.8 V - enabling robust protection of 36 V-rated systems against ESD, lightning-induced surges, and inductive switching transients in automotive and industrial control modules.

For engineers reviewing the P6KE43C datasheet, P6KE43C pinout, P6KE43C application, or P6KE43C equivalent, key selection criteria include its DO-204AC (DO-15) axial package, unidirectional polarity with cathode band marking, 175°C junction temperature rating, and compliance with AEC-Q101 for automotive-grade reliability - all critical for high-surge immunity in engine control units, LED drivers, and industrial PLC I/O protection.

Technical Context

The P6KE43C operates as a silicon avalanche diode optimized for fast clamping response (<1.0 ps rise time from 0 V to V_BR) and low dynamic impedance to limit transient energy delivered to downstream circuitry. Its unidirectional configuration provides reverse-biased protection only, requiring correct polarity placement relative to the protected rail.

It delivers 600 W peak pulse power per 10/1000 µs waveform at 25°C, derating linearly above TA = 25°C per published curve (Fig.2), with steady-state power dissipation of 5 W at 75°C on specified copper pads. Junction capacitance is not specified for this variant but falls within typical P6KE-series range (≤1000 pF at VR = 0 V).

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 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 P6KE43C, SMAJ43A offers SMT compatibility but sacrifices mechanical robustness and thermal mass, while 1.5KE43C matches footprint, rating, and qualification - making it the most seamless alternative for drop-in replacement in existing DO-15 designs.

Availability

P6KE43C is available at Aetrix Electronics and suitable for automotive engine control units, industrial 36 V motor drives, and LED streetlight power supplies requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.

Supply support for P6KE43C 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 distribution and automotive qualification capabilities.

The P6KE series targets cost-sensitive, high-reliability transient protection in automotive, industrial, and lighting applications - emphasizing rugged packaging, AEC-Q101 compliance, and consistent clamping performance across temperature.

FAQ

What is the polarity configuration of the P6KE43C?

The P6KE43C is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts in reverse bias above V_BR and blocks forward current up to its rated I_FSM. This configuration is intended for DC rail clamping where polarity is fixed, unlike bidirectional variants (e.g., P6KE43CA) used for AC or differential signal protection. The P6KE43C must be oriented with cathode toward the protected line.

Does the P6KE43C meet AEC-Q101 requirements?

Yes, the P6KE43C is explicitly AEC-Q101 qualified per Taiwan Semiconductor's ordering code documentation (suffix "C" denotes AEC-Q101 grade). It undergoes stress testing including temperature cycling, high-temperature operating life, and mechanical shock per AEC-Q101 Rev D, making it suitable for automotive powertrain and body electronics applications. The P6KE43C qualification excludes earlier "A"-suffix variants below 10 V.

What is the maximum peak surge current the P6KE43C can handle?

The P6KE43C supports a maximum peak surge current (I_PP) of 10 A under the standard 10/1000 µs double-exponential waveform at 25°C ambient. This value is derived from its 600 W peak pulse power rating and clamping voltage of 61.9 V (I_PP = P_PK/V_C). Derating applies above 25°C per Fig.2 in the datasheet, reducing usable surge current by ~0.5% per °C rise.

How does the P6KE43C compare to the P6KE43A variant?

The P6KE43C and P6KE43A share identical electrical specifications (V_BR = 38.7–47.3 V, V_C = 61.9 V, P_PK = 600 W) but differ in qualification: P6KE43C is AEC-Q101 qualified, while P6KE43A is commercial-grade. Both use DO-204AC packaging and cathode-band polarity. The P6KE43C is selected for automotive applications requiring certified reliability; P6KE43A serves cost-sensitive industrial or consumer uses where qualification is not mandated.

Is the P6KE43C suitable for protecting RS-485 data lines?

No, the P6KE43C is not recommended for direct RS-485 data line protection due to its high clamping voltage (61.9 V) and unidirectional configuration, which cannot suppress symmetrical transients on differential pairs. For RS-485, lower-voltage bidirectional TVS arrays (e.g., 12 V or 15 V rated) in SOT-23 or SOIC packages are appropriate. The P6KE43C may protect the 36 V DC bias rail powering the RS-485 transceiver, but not the signal lines themselves.