Taiwan Semiconductor Corporation P4KE120A

Overview

P4KE120A from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails and signal lines. It features a 120V nominal breakdown voltage, 102V working stand-off voltage, 165V maximum clamping voltage at 2.5A peak pulse current, and <1μA reverse leakage at rated VWM - enabling robust ESD and lightning surge immunity in automotive body electronics and industrial control I/O modules.

For engineers reviewing the P4KE120A datasheet, P4KE120A pinout, P4KE120A application, or P4KE120A equivalent, this device is selected for high-energy transient suppression where low clamping ratio (VC/VBR ≈ 1.45), AEC-Q101 qualification, DO-41 package compatibility, and stable temperature coefficient (0.107%/°C) are critical design requirements.

Technical Context

The P4KE120A operates as a silicon avalanche diode with unidirectional polarity, triggered when transient voltage exceeds its 114–126V breakdown range at 1mA test current. Its clamping action limits downstream voltage to ≤165V under 10/1000μs waveform surges up to 400W, with sub-nanosecond response (<1.0ps from 0V to VBR).

Thermal performance is defined by a 175°C maximum junction temperature and 1W steady-state power dissipation on 5×5mm copper pads. The device meets UL 94V-0 flammability, JESD201 Class 2 whisker resistance, and RoHS/halogen-free compliance per IEC 61249-2-21.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41) axial-leaded plastic package with cathode band marking; 0.300g weight; pure tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P4KE120A, SMBJ120A offers superior surge handling in a smaller SMD form factor but requires rework of layout and solder process, while 1.5KE120A delivers triple the peak power in identical through-hole packaging but increases parasitic inductance - making P4KE120A optimal for cost-sensitive, space-constrained 400W-class protection.

Availability

P4KE120A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and LED driver OVP applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for P4KE120A 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 P4KE series belongs to TSC's high-reliability TVS portfolio engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 qualification, tight parametric tolerances, and robust surge endurance in harsh environments.

FAQ

What is the key difference between P4KE120A and P4KE120?

The P4KE120A has tighter breakdown voltage tolerance (114–126V vs. 108–132V for P4KE120), lower clamping voltage (165V vs. 173V), and improved temperature coefficient consistency. This makes P4KE120A preferable in precision protection circuits where stable threshold behavior across temperature is required - such as in automotive sensor interface modules where P4KE120A ensures repeatable clamping performance from −40°C to +125°C.

Is P4KE120A suitable for bidirectional transient protection?

No - P4KE120A is a unidirectional TVS diode, marked with a cathode band and intended for DC line protection with defined polarity. For bidirectional applications like AC lines or data bus protection, use the CA-suffixed variant (e.g., P4KE120CA) or bipolar devices explicitly rated for symmetrical clamping in both directions - P4KE120A will not conduct or clamp correctly on negative-going transients.

What does the "A" suffix signify in P4KE120A?

The "A" suffix denotes tighter parameter tolerances: ±5% breakdown voltage (vs. ±10% for non-A variants), lower clamping voltage, and improved consistency in leakage and temperature coefficient. In P4KE120A, this translates to guaranteed V_BR between 114V and 126V at 1mA, enabling more deterministic circuit protection design compared to the broader 108–132V range of P4KE120 - critical for meeting stringent automotive EMC targets.

Can P4KE120A be used in place of P4KE100A on a 24V system?

No - P4KE120A's 102V working stand-off voltage is too high for direct substitution on a 24V rail, risking insufficient protection margin. A 24V system typically requires V_WM ≥27V (e.g., P4KE33A or P4KE36A) to avoid leakage-induced power loss and thermal runaway. Using P4KE120A would leave the rail unprotected below 102V, allowing damaging transients to pass unclamped - P4KE120A is designed for ≥100V DC systems like telecom -48V return or industrial 110V control rails.

Does P4KE120A meet UL 94V-0 flammability requirements?

Yes - the P4KE120A uses molding compound certified to UL 94V-0 flammability rating, as confirmed in the mechanical data section of the official Taiwan Semiconductor datasheet (Version N2104). This ensures the DO-41 package housing will self-extinguish within 10 seconds after flame removal and prevent dripping of flaming particles - a mandatory requirement for safety-critical industrial and transportation equipment approvals.