Taiwan Semiconductor Corporation P4SMA43C

Overview

P4SMA43C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 43V nominal breakdown voltage (V_BR = 38.7–47.3V), 34.8V working stand-off voltage (V_WM), 61.9V maximum clamping voltage (V_C) at 6.7A peak pulse current, and 400W peak pulse power rating under 10/1000μs waveform.

For engineers reviewing the P4SMA43C datasheet, P4SMA43C pinout, P4SMA43C application, or P4SMA43C equivalent, key selection considerations include its DO-214AC (SMA) package compatibility, bidirectional surge suppression capability per ISO 7637-2 (Pulse 1/2a/2b/3a/3b), sub-1μA reverse leakage at V_WM, and -55°C to +150°C operating junction temperature range.

Technical Context

The P4SMA43C implements a single-die, glass-passivated PN junction optimized for fast transient response (<1.0ps typical) and low clamping ratio (V_C/V_BR ≈ 1.3–1.4). Its bidirectional configuration enables symmetrical surge suppression without polarity sensitivity, supporting both positive and negative transients on the same line.

It complies with JESD201 Class 2 whisker resistance, UL 94V-0 molding compound, and moisture sensitivity level 1 (per J-STD-020), making it suitable for automated SMT assembly and high-reliability industrial environments where thermal cycling and long-term solder joint integrity are critical.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, molded plastic case with matte tin-plated leads; cathode band marking indicates polarity for unidirectional variants - however, P4SMA43C is bidirectional and lacks polarity marking per datasheet specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ43CA and 1.5KE43CA, the P4SMA43C offers optimal balance of compact DO-214AC footprint, precise 61.9V clamping, and full ISO 7637-2 compliance - making it ideal for space-constrained automotive and industrial SMT designs requiring repeatable, low-leakage transient suppression.

Availability

P4SMA43C is available at Aetrix Electronics and suitable for switching mode power supplies, automotive DC/DC converters, and LED driver applications requiring stable component supply, consistent parametric performance, and full traceability across production batches.

Supply support for P4SMA43C 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.

The P4SMA series belongs to TSC's surface-mount TVS portfolio, engineered specifically for high-reliability, automated assembly environments demanding ISO 7637-2 compliance, low leakage, and stable clamping performance across temperature.

FAQ

What does the "C" suffix indicate in P4SMA43C?

The "C" suffix in P4SMA43C denotes bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., P4SMA43), the P4SMA43C has no polarity marking and functions identically regardless of voltage polarity applied across its terminals - a key requirement for protecting AC-coupled or floating signal lines and dual-rail power systems.

Is P4SMA43C compatible with lead-free reflow soldering processes?

Yes, P4SMA43C is fully compatible with standard lead-free reflow profiles (JEDEC J-STD-020 Level 1), featuring matte tin-plated leads and a moisture sensitivity level (MSL) of 1. Its DO-214AC (SMA) package withstands peak temperatures up to 260°C for 30 seconds without degradation, and the UL 94V-0 molding compound ensures process stability and flame resistance during assembly.

What is the maximum clamping voltage of P4SMA43C under surge conditions?

The maximum clamping voltage (V_C) of P4SMA43C is 61.9 V when subjected to a 10/1000μs surge waveform with a peak pulse current (I_PPM) of 6.7 A. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage seen by protected circuitry during standardized transient events - critical for ensuring downstream components remain within their absolute maximum ratings.

Does P4SMA43C meet automotive-grade reliability standards?

Yes, P4SMA43C meets key automotive transient immunity requirements, including full compliance with ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b. Its −55°C to +150°C operating junction temperature range, JESD201 Class 2 whisker resistance, and glass-passivated junction support use in engine control units, body electronics, and ADAS modules where long-term reliability under thermal and electrical stress is mandatory.

How does P4SMA43C differ from the "A" version (P4SMA43A)?

P4SMA43C and P4SMA43A share the same 43V nominal breakdown voltage but differ in V_BR tolerance: P4SMA43C has a wider 38.7–47.3V range (±10%), while P4SMA43A specifies a tighter 40.9–45.2V range (±5%). Both offer identical 34.8V V_WM, 61.9V/59.3V V_C, and DO-214AC packaging. The "C" suffix confirms bidirectionality; "A" denotes tighter V_BR tolerance - not polarity - and both are bidirectional per datasheet footnote 4.