Taiwan Semiconductor Corporation P4SMA15A

Overview

P4SMA15A 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 14.3–15.8 V breakdown voltage (V_BR), 12.8 V working stand-off voltage (V_WM), 21.2 V clamping voltage (V_C) at 20 A peak pulse current, 400 W peak pulse power rating (10/1000 µs), and operates across –55 °C to +150 °C junction temperature range.

For engineers reviewing the P4SMA15A datasheet, P4SMA15A pinout, P4SMA15A application, or P4SMA15A equivalent, this device is selected for robust ESD and surge immunity in compact, high-reliability power conversion stages where fast clamping (<1 ps response), low leakage (<1 µA at V_WM), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.

Technical Context

The P4SMA15A employs a glass-passivated silicon junction optimized for unidirectional transient suppression. Its clamping behavior follows standardized 10/1000 µs double-exponential surge waveform per IEC 61000-4-5 and ANSI/IEEE C62.35, with guaranteed V_C ≤ 21.2 V at I_PPM = 20 A.

Thermal derating begins above 25 °C ambient per Fig.2, maintaining 400 W capability only at T_A = 25 °C; maximum junction temperature is rated at 150 °C, and moisture sensitivity level is J-STD-020 Level 1 - enabling standard reflow without dry-pack handling.

Key Specifications

Pinout & Package

DO-214AC (SMA) package: surface-mount, molded plastic case with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; weight ≈ 0.060 g; UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ15A and 1.5SMC15A, the P4SMA15A delivers identical V_BR and V_C performance in the smallest DO-214AC footprint, making it optimal for high-density layouts where 400 W surge immunity suffices and thermal budget is constrained.

Availability

P4SMA15A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full traceability and lifecycle support.

Supply support for P4SMA15A 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, and power MOSFETs since 1979.

The P4SMA series targets cost-sensitive, high-volume industrial and automotive power protection applications, emphasizing reliability under ISO 7637-2 stress, JEDEC-compliant packaging, and tight parametric control across temperature.

FAQ

What is the polarity configuration of the P4SMA15A?

The P4SMA15A is a unidirectional TVS diode with cathode marked by a band on the DO-214AC package. It conducts only during reverse-bias overvoltage events - i.e., when cathode voltage exceeds anode by more than V_BR. Forward conduction is not intended for protection; the 3.5 V maximum forward voltage at 25 A applies only to surge testing conditions, not functional operation. The P4SMA15A must be oriented with cathode toward the protected line.

Does the P4SMA15A meet automotive ESD standards?

Yes, the P4SMA15A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical system immunity. While not explicitly rated to ISO 10605 (ESD), its <1 ps response time and sub-1 µA leakage at 12.8 V V_WM make it effective for board-level ESD suppression in automotive infotainment and body control modules. For direct connector-level ESD, dedicated IEC 61000-4-2 TVS arrays are recommended alongside the P4SMA15A.

What is the maximum surge current the P4SMA15A can handle repeatedly?

The P4SMA15A is rated for non-repetitive 20 A peak impulse current (I_PPM) under 10/1000 µs waveform at T_A = 25 °C. Repetitive surge capability depends on thermal recovery: per Fig.2, derating to ~240 W at 85 °C ambient limits practical repetitive I_PPM to ≤12 A with ≥1 s between pulses. For frequent surges, thermal simulation and layout copper area must ensure junction temperature stays below 150 °C during worst-case duty cycles.

Can the P4SMA15A replace a P4SMA15 in the same PCB layout?

Yes, the P4SMA15A is a tighter-tolerance variant of the P4SMA15, with V_BR = 14.3–15.8 V (vs. 13.5–16.5 V) and identical DO-214AC package, pinout, and thermal characteristics. The improved V_BR consistency reduces design margin uncertainty and improves clamping predictability. No PCB changes are required; the P4SMA15A is a drop-in upgrade for new designs or replacements where tighter voltage control is beneficial.

Is the P4SMA15A halogen-free and RoHS compliant?

Yes, the P4SMA15A is both RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants (BFRs), chlorinated flame retardants (CFRs), antimony trioxide, or phosphorus-based flame retardants exceeding threshold limits. This ensures compatibility with lead-free reflow profiles and environmental compliance for global electronics markets.