Taiwan Semiconductor Corporation P4SMA6.8H

Overview

P4SMA6.8H 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 6.12–7.48 V breakdown voltage (V_BR), 5.5 V working stand-off voltage (V_WM), 10.8 V clamping voltage (V_C) at 38 A peak pulse current, 400 W peak pulse power rating (10/1000 µs), and <1.0 ps response time - deployed in SMPS input stages to suppress ESD and load-dump transients.

For engineers reviewing the P4SMA6.8H datasheet, P4SMA6.8H pinout, P4SMA6.8H application, or P4SMA6.8H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification for automotive environments, DO-214AC (SMA) package compatibility with automated placement, and leakage current <1000 µA at V_WM.

Technical Context

The P4SMA6.8H operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to shunt surge energy to ground. Its glass-passivated junction ensures stable V_BR tolerance (±5% min/max spread) and low temperature coefficient (0.057 %/°C), enabling predictable clamping across –55°C to +150°C operating range.

It delivers 400 W peak pulse power handling per 10/1000 µs waveform with <1.0 ps intrinsic response, supported by a 150°C maximum junction temperature and J-STD-020 Level 1 moisture sensitivity rating - confirming suitability for reflow-soldered automotive and industrial power converters without derating concerns below 75°C ambient.

Key Specifications

Pinout & Package

DO-214AC (SMA) surface-mount package: cathode-banded end denotes terminal 1 (cathode); anode is unmarked end. Matte tin-plated leads meet J-STD-002 solderability; polarity marking aligns with JEDEC standard orientation for automated optical recognition.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ6.8A and 1.5SMC6.8A, the P4SMA6.8H offers optimal balance of compact DO-214AC size, AEC-Q101 compliance, and precise 5.5 V V_WM for 5 V–12 V rail protection - making it preferred for space-constrained automotive and consumer power modules where 400 W surge immunity suffices.

Availability

P4SMA6.8H is available at Aetrix Electronics and suitable for switching mode power supplies, automotive DC/DC converters, and LED lighting applications requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for P4SMA6.8H 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, and rectifiers with global AEC-Q101 and RoHS-compliant production lines.

The P4SMA6.8H belongs to TSC's P4SMAxH family of surface-mount TVS diodes engineered specifically for cost-sensitive, high-volume automotive and industrial power rail protection with stringent clamping and reliability requirements.

FAQ

What is the maximum clamping voltage of the P4SMA6.8H under standard test conditions?

The P4SMA6.8H has a maximum clamping voltage (V_C) of 10.8 V when subjected to a 10/1000 µs waveform with a peak pulse current (I_PPM) of 38 A. This value is measured per IEC 61000-4-5 and ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuits during surge events. The P4SMA6.8H maintains this clamping performance across its full operating temperature range.

Is the P4SMA6.8H suitable for bidirectional transient suppression?

No, the P4SMA6.8H is a unidirectional TVS diode intended for DC rail protection with defined anode/cathode polarity. For bidirectional applications, Taiwan Semiconductor specifies the P4SMA6.8CH or P4SMA6.8CAH variants, which feature symmetrical breakdown in both directions. Using the P4SMA6.8H in AC or bipolar signal paths risks forward conduction and failure; always verify polarity alignment in schematic and layout for the P4SMA6.8H.

Does the P4SMA6.8H meet automotive qualification standards?

Yes, the P4SMA6.8H is AEC-Q101 qualified and tested per the full stress test schedule including HTGB, H3TRB, temperature cycling, and ESD. It also complies with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for automotive electrical disturbance immunity. These qualifications are documented in Taiwan Semiconductor's official A2102 revision release and apply explicitly to the P4SMA6.8H variant.

What is the leakage current specification for the P4SMA6.8H at its working stand-off voltage?

The P4SMA6.8H exhibits a maximum reverse leakage current (I_R) of 1000 µA when biased at its rated working stand-off voltage (V_WM) of 5.5 V. This value is guaranteed at T_A = 25°C and confirms minimal parasitic loading on low-power 5 V monitoring or bias rails. Leakage remains well below 1 µA at voltages ≤4.5 V, supporting precision sensing applications adjacent to the P4SMA6.8H.

Can the P4SMA6.8H be used in lead-free reflow processes?

Yes, the P4SMA6.8H is compatible with standard lead-free reflow profiles per J-STD-020. Its DO-214AC (SMA) package uses matte tin-plated leads that meet J-STD-002 solderability requirements and has a moisture sensitivity level (MSL) of 1 - meaning it can be stored indefinitely at ≤30°C/60% RH and processed without baking. The UL 94V-0 molding compound withstands peak reflow temperatures up to 260°C for 30 seconds, fully supporting IPC-A-610 Class 2/3 assembly.