Taiwan Semiconductor Corporation P6KE68CAH

Overview

P6KE68CAH from Taiwan Semiconductor is a bidirectional 600W transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a nominal breakdown voltage of 68V, clamps transients to ≤92.0V at 6.8A peak pulse current, and operates within -55°C to +175°C junction temperature range. It is AEC-Q101 qualified and housed in DO-204AC (DO-15) package for robust ESD and lightning-induced surge suppression in DC power inputs.

For engineers reviewing the P6KE68CAH datasheet, P6KE68CAH pinout, P6KE68CAH application, or P6KE68CAH equivalent, this device serves as a critical front-end protection component where fast clamping (<5.0ns response), low dynamic impedance, and stable VBR temperature coefficient (0.104%/°C) are required to safeguard downstream DC-DC converters, microcontrollers, and sensor interfaces against ISO 7637-2/IEC 61000-4-5 threats.

Technical Context

The P6KE68CAH is a single-die, bidirectional TVS diode optimized for unidirectional and bidirectional surge waveforms per IEC 61000-4-5 (10/1000μs) and ISO 7637-2. Its symmetrical breakdown behavior (VBR min/max = 64.6V / 71.4V at IT = 1mA) ensures consistent clamping in both polarities without polarity-dependent design constraints.

It delivers 600W non-repetitive peak pulse power with a maximum clamping voltage of 92.0V at IPP = 6.8A, enabling reliable protection of 48V and 60V automotive subsystems. Its junction capacitance is not specified in the provided documentation, and it exhibits <1μA reverse leakage at VWM = 58.1V - confirming low standby power impact on protected circuits.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with UL 94V-0 rating and pure tin-plated leads compliant with J-STD-002 solderability. Polarity marked by cathode band; bidirectional configuration means no functional anode/cathode distinction - terminals are symmetric.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ64CA and 1.5KE68CA, the P6KE68CAH provides optimal balance of AEC-Q101 qualification, DO-15 mechanical robustness, 600W surge handling, and low leakage - making it the preferred choice for volume automotive and industrial designs requiring proven reliability and supply continuity.

Availability

P6KE68CAH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial PLC power inputs, LED driver systems, and telecom power interface protection requiring stable component supply and long-term lifecycle support.

Supply support for P6KE68CAH 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, rectifiers, and MOSFETs, with global distribution and AEC-Q101 validation capabilities.

The P6KE series targets automotive and industrial surge protection, engineered for high-reliability front-end clamping in harsh environments - emphasizing AEC-Q101 compliance, wide temperature operation, and standardized DO-15 packaging for drop-in manufacturability.

FAQ

What does the "CA" suffix indicate in P6KE68CAH?

The "CA" suffix in P6KE68CAH denotes bidirectional configuration - meaning the device functions identically in both polarities, with symmetrical breakdown and clamping characteristics. This eliminates polarity concerns during PCB layout and supports protection of AC-coupled or floating DC rails. The "H" suffix confirms AEC-Q101 qualification, verified per TSC's P2203 specification revision.

Is P6KE68CAH suitable for protecting a 48V automotive CAN bus power line?

Yes, P6KE68CAH is appropriate for 48V CAN bus power line protection. Its 58.1V standoff voltage provides sufficient margin above nominal 48V operation, and its 92.0V clamping voltage stays well below typical CAN transceiver absolute maximum ratings (e.g., ±40V common-mode, but power rail tolerance often exceeds 100V). Its AEC-Q101 qualification and -55°C to +175°C rating align with automotive requirements.

How does P6KE68CAH compare to unidirectional P6KE68AH in terms of application flexibility?

P6KE68CAH supports bidirectional surge suppression - essential for AC-input stages, floating grounds, or systems where reverse-polarity transients may occur. In contrast, P6KE68AH is unidirectional and requires correct polarity orientation; using it incorrectly results in no protection. For most automotive power inputs (which are DC but subject to negative-going transients), P6KE68CAH offers safer, orientation-insensitive deployment without compromising clamping performance.

What is the maximum allowable surge repetition rate for P6KE68CAH without thermal degradation?

P6KE68CAH is rated for non-repetitive surges per Fig.2 derating curve. At 25°C ambient, it handles one 600W pulse; at 75°C, derated to ~300W. For repetitive operation, thermal recovery must occur between pulses - typically limiting to ≤0.1Hz (one pulse every 10 seconds) with adequate PCB copper area (5×5 mm pads per lead). Higher rates require thermal modeling or selection of higher-power alternatives like 1.5KE68CA.

Does P6KE68CAH meet IEC 61000-4-5 Level 4 surge immunity requirements?

Yes, P68KE68CAH meets IEC 61000-4-5 Level 4 (4kV line-to-earth, 2kV line-to-line) when properly implemented with appropriate PCB layout (short traces, ground plane, minimal loop area). Its 600W rating at 10/1000μs waveform exceeds the 2.5kV/12Ω generator output energy (~420W), and its 92.0V clamping ensures protected circuitry remains within safe operating limits during test conditions.