Taiwan Semiconductor Corporation P6KE56C

Overview

P6KE56C from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 56 V, clamps transients to ≤80.5 V at 7.8 A peak surge current, and delivers sub-nanosecond response time (<1.0 ps from 0 V to V_BR) - critical for safeguarding automotive ECUs against ISO 7637-2 load dump and EFT bursts.

For engineers reviewing the P6KE56C datasheet, P6KE56C pinout, P6KE56C application, or P6KE56C equivalent, key selection considerations include its DO-204AC (DO-15) axial package, 45.4 V stand-off voltage, <1 μA leakage above 10 V, AEC-Q101 qualification (per H-suffix variants), and compatibility with 10/1000 μs surge waveforms in industrial power supplies and LED driver front-ends.

Technical Context

The P6KE56C operates as a silicon avalanche diode with unidirectional polarity, leveraging controlled Zener/avalanche breakdown to clamp transient energy before it reaches downstream ICs. Its low dynamic impedance ensures stable clamping under fast-rising surges, while the 0.103 %/°C temperature coefficient of V_BR maintains predictable threshold drift across –55°C to +175°C junction temperatures.

It is rated for non-repetitive 600 W peak pulse power (10/1000 μs), supports 100 A I_FSM forward surge capability (8.3 ms half-sine), and exhibits typical junction capacitance <100 pF at 0 V - enabling use in medium-speed data lines without signal integrity degradation.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, molded epoxy case 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 Littelfuse SMAJ58A and ON Semi 1.5KE56C, the P6KE56C offers optimal balance of axial-package serviceability, AEC-Q101 readiness, and precise 45.4 V–61.6 V breakdown tolerance - making it preferred for cost-sensitive, high-volume automotive and industrial power rail protection where 600 W suffices.

Availability

P6KE56C is available at Aetrix Electronics and suitable for automotive ECU power conditioning, industrial PLC input protection, and LED driver front-end surge suppression requiring stable component supply and long-term lifecycle support.

Supply support for P6KE56C 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, serving global automotive, industrial, and consumer markets since 1979.

The P6KE series belongs to TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust, cost-effective overvoltage protection in harsh-environment power systems - emphasizing reliability, tight parameter distribution, and seamless integration into existing PCB layouts.

FAQ

What is the polarity configuration of the P6KE56C?

The P6KE56C is a unidirectional TVS diode, with cathode indicated by a band on the DO-204AC (DO-15) package. It conducts only during reverse-bias overvoltage events - i.e., when the anode is more negative than the cathode - and blocks normal forward current like a standard rectifier diode. This polarity must be observed during PCB placement to ensure correct clamping behavior in the P6KE56C application.

Does the P6KE56C meet AEC-Q101 qualification?

The base P6KE56C part is not AEC-Q101 qualified; however, the P6KE56CH variant (with "H" suffix) is explicitly certified per AEC-Q101 Rev D for automotive use. The qualification covers temperature cycling, humidity testing, mechanical shock, and surge endurance - confirming suitability for under-hood applications. Always specify P6KE56CH when AEC-Q101 compliance is required for the P6KE56C design-in.

What is the maximum clamping voltage of the P6KE56C under surge conditions?

The P6KE56C clamps to a maximum of 80.5 V when subjected to its rated 7.8 A peak pulse current (I_PP) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and lot variations per the datasheet's electrical specifications table. Designers must verify that downstream components tolerate this clamping voltage - e.g., a 100 V-rated capacitor or 85 V-max input LDO - to ensure robust protection using the P6KE56C.

Can the P6KE56C be used in bidirectional configurations?

No - the P6KE56C is strictly unidirectional. For bidirectional transient suppression, select the P6KE56CA variant (with "CA" suffix), which uses a back-to-back diode configuration to protect both polarities. Using the P6KE56C in bidirectional circuits risks failure during positive-going transients, as it lacks reverse conduction capability. Always match the P6KE56C polarity to the intended protection direction in the schematic.

What is the thermal derating behavior of the P6KE56C above 25°C ambient?

The P6KE56C's peak pulse power rating decreases linearly above 25°C ambient, following the derating curve in Figure 2 of the datasheet: at 75°C, it retains ~70% of its 600 W rating (~420 W), and at 125°C, ~40% (~240 W). This derating applies to non-repetitive pulses; for repetitive surges, average power dissipation must stay within the 5 W steady-state limit at 75°C. Thermal design must account for this when deploying the P6KE56C in high-temperature enclosures.