Taiwan Semiconductor Corporation P6KE91

Overview

P6KE91 from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 91 V, clamps transients to ≤131 V at 4.8 A peak surge current, and delivers fast response (<1.0 ps from 0 V to V_BR), with a stand-off voltage of 73.7 V and leakage <1 µA at rated V_WM. It is used in automotive body electronics to protect LIN bus transceivers against load dump and ISO 7637-2 pulses.

For engineers reviewing the P6KE91 datasheet, P6KE91 pinout, P6KE91 application, or P6KE91 equivalent, key selection criteria include its DO-204AC (DO-15) axial package, unidirectional polarity, 175 °C max junction temperature, and compliance with AEC-Q101 (when ordered as P6KE91H), making it suitable for under-hood automotive modules requiring robust ESD and EFT immunity.

Technical Context

The P6KE91 operates as a silicon avalanche diode, leveraging controlled reverse-biased breakdown to clamp transient energy before downstream circuitry is damaged. Its low dynamic impedance ensures stable clamping performance across surge currents up to 4.8 A (10/1000 µs waveform), while its <1 µA leakage at 73.7 V enables minimal standby power loss in always-on systems.

Designed for unidirectional operation only, the device exhibits a temperature coefficient of V_BR of +0.106 %/°C and is rated for continuous operation from –55 °C to +175 °C. It meets UL 94V-0 flammability requirements and is halogen-free per IEC 61249-2-21 - critical for automotive and industrial assemblies subject to environmental compliance audits.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with cathode band marking. Dimensions conform to JEDEC DO-15 outline; weight ≈0.400 g. Leads are pure tin-plated and meet JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ90A and 1.5KE91A, the P6KE91 offers native axial DO-15 compatibility for legacy board designs, guaranteed <1 µA leakage for ultra-low-power systems, and optional AEC-Q101 qualification - making it optimal for automotive Tier 1 suppliers needing audit-ready components with drop-in mechanical fit.

Availability

P6KE91 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, smart lighting power rails, and LIN bus interface design requiring stable component supply and long-term lifecycle assurance.

Supply support for P6KE91 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 automotive, industrial, and consumer markets since 1979.

The P6KE series belongs to TSC's high-reliability TVS portfolio engineered specifically for automotive-grade transient suppression - emphasizing low clamping voltage, AEC-Q101 qualification paths, and robust surge endurance in under-hood environments.

FAQ

What is the maximum clamping voltage of the P6KE91 under standard surge conditions?

The P6KE91 clamps to a maximum of 131 V when subjected to a 4.8 A peak pulse current with a 10/1000 µs waveform - this value is specified in the Electrical Specifications table and verified per JEDEC test methods. This clamping performance ensures protected ICs remain within safe operating limits during ISO 7637-2 Pulse 1 and Pulse 2a events. The P6KE91 achieves this with minimal voltage overshoot due to its sub-nanosecond response time.

Is the P6KE91 suitable for bidirectional transient protection?

No, the P6KE91 is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the line being protected, anode to ground. For bidirectional protection, TSC offers the P6KE91CA variant (not P6KE91). Using P6KE91 in reverse-biased configuration beyond its V_WM risks permanent damage. Always verify polarity during layout and assembly to ensure reliable operation of the P6KE91.

Does the P6KE91 meet AEC-Q101 reliability standards?

The base P6KE91 is not AEC-Q101 qualified; however, the variant P6KE91H (ordered with "H" suffix) is fully AEC-Q101 qualified per Rev G requirements, including HTOL, TC, and ESD testing. This qualification covers temperature cycling, high-temperature reverse bias, and human-body-model ESD. When automotive qualification is required, specify P6KE91H - the P6KE91 itself is intended for industrial and commercial applications.

What is the junction-to-ambient thermal resistance (R_θJA) of the P6KE91 in DO-15 package?

TSC does not publish R_θJA for the P6KE91 in standard datasheet conditions; thermal performance depends on PCB layout - specifically copper pad area and trace width. Per Absolute Maximum Ratings, the device supports 5 W steady-state dissipation at T_A = 75 °C when mounted on 5 × 5 mm copper pads per lead. For thermal modeling, designers should reference JEDEC JESD51-2 and apply measured or simulated R_θJA based on their specific board stack-up - the P6KE91's 175 °C T_JMAX allows margin even in high-ambient environments.

Can the P6KE91 replace the 1.5KE91A in existing designs?

The P6KE91 is mechanically and electrically compatible with the 1.5KE91A - same DO-204AC (DO-15) package, identical V_WM (73.7 V), V_BR (81.9–100 V), and V_C (131 V) specifications. However, the P6KE91 offers lower typical leakage (<1 µA vs. ~2 µA) and optional AEC-Q101 qualification (as P6KE91H). No PCB changes are needed, and the P6KE91 can be used as a direct functional upgrade in all 1.5KE91A applications.