Taiwan Semiconductor Corporation P4SMA10A

Overview

P4SMA10A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 9.5–10.5 V breakdown voltage (V_BR), 8.55 V working stand-off voltage (V_WM), and clamps to ≤14.5 V at 29 A peak impulse current (I_PPM) under 10/1000 µs waveform - enabling robust ESD and surge suppression in compact 400 W-rated SMPS and DC/DC converters.

For engineers reviewing the P4SMA10A datasheet, P4SMA10A pinout, P4SMA10A application, or P4SMA10A equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, sub-1 µA reverse leakage at V_WM, <1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking for accurate board-level placement.

Technical Context

The P4SMA10A operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast clamping of transient energy without latch-up. Its 150 °C maximum junction temperature and -55 °C to +150 °C operating range support industrial and automotive ambient conditions.

It delivers 400 W peak pulse power (t_p = 1 ms) with derating above 25 °C per Fig.2, and exhibits a 0.073 %/°C temperature coefficient of V_BR, ensuring stable breakdown across thermal gradients in high-density power designs.

Key Specifications

Pinout & Package

DO-214AC (SMA) package: Surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ10A and 1.5SMC10A, the P4SMA10A offers optimal balance of 400 W surge capability, DO-214AC footprint compatibility with high-speed placement, and sub-10 µA leakage - making it preferred for space-constrained, cost-sensitive DC/DC and adapter designs requiring ISO 7637-2 compliance.

Availability

P4SMA10A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and full traceability across production batches.

Supply support for P4SMA10A 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, specializing in TVS diodes, rectifiers, Zener diodes, and MOSFETs for industrial and automotive markets.

The P4SMA series belongs to TSC's surface-mount TVS portfolio engineered specifically for high-reliability, automated-assembly surge protection in compact power conversion and interface circuits - emphasizing low leakage, tight V_BR tolerance, and standardized DO-214AC packaging.

FAQ

What is the maximum clamping voltage of the P4SMA10A under standard surge conditions?

The P4SMA10A has a maximum clamping voltage (V_C) of 14.5 V when subjected to a 10/1000 µs waveform at its rated peak impulse current of 29 A. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during transient events, directly protecting downstream components rated for ≤16 V operation. The P4SMA10A maintains this clamping performance across its specified junction temperature range.

Is the P4SMA10A suitable for bidirectional transient suppression?

No, the P4SMA10A is a unidirectional TVS diode intended for DC rail protection with defined polarity - cathode connects to the protected line, anode to ground. For bidirectional applications, Taiwan Semiconductor specifies the P4SMA10CA variant (with "CA" suffix), which provides symmetrical clamping in both directions. Using P4SMA10A in AC or floating-bus scenarios risks improper conduction and inadequate protection.

What does the "A" suffix indicate in P4SMA10A compared to P4SMA10?

The "A" suffix in P4SMA10A denotes tighter breakdown voltage tolerance: P4SMA10A has a V_BR range of 9.50–10.50 V (±5%), whereas P4SMA10 is 9.00–11.00 V (±10%). This improved tolerance enables more precise overvoltage thresholding in sensitive power systems, reducing design margin uncertainty. Both share identical package, power rating, and clamping characteristics, but P4SMA10A is preferred where V_BR consistency is critical.

Does the P4SMA10A meet automotive surge immunity standards?

Yes, the P4SMA10A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for 12 V automotive subsystems such as body control modules and infotainment power supplies. Its DO-214AC package, J-STD-020 Level 1 MSL rating, and -55 °C to +150 °C operating range further support automotive qualification needs - though system-level validation remains the designer's responsibility.

What is the reverse leakage current specification for the P4SMA10A at its working stand-off voltage?

The P4SMA10A specifies a maximum reverse leakage current (I_R) of 10 µA at its working stand-off voltage (V_WM) of 8.55 V and T_A = 25 °C. This low leakage minimizes standby power loss and avoids false triggering in high-impedance sensing or battery-backed circuits. Leakage remains well below 100 µA even at elevated temperatures up to 125 °C, supporting reliable operation in thermally demanding environments.