Vishay General Semiconductor - Diodes Division P4SMA47AHE3_A/H

Overview

P4SMA47AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 47 V breakdown voltage (V_BR = 44.7–49.4 V at I_T = 1.0 mA), 400 W peak pulse power (10/1000 µs), and 6.2 A peak pulse current (I_PPM). It provides clamping voltage of 64.8 V at I_PPM, operates from –65 °C to +150 °C, and is AEC-Q101 qualified for automotive applications.

For engineers reviewing the P4SMA47AHE3_A/H datasheet, P4SMA47AHE3_A/H pinout, P4SMA47AHE3_A/H application, or P4SMA47AHE3_A/H equivalent, this device serves as a robust, low-profile overvoltage protection solution for DC power rails, sensor interfaces, and MOSFET gate drivers in harsh environments where fast response (<1 ns), low clamping ratio, and high surge reliability are required.

Technical Context

The P4SMA47AHE3_A/H uses a glass-passivated silicon junction optimized for transient suppression under repetitive 10/1000 µs surges up to 400 W (derated to 300 W above 91 V). Its unidirectional polarity features a cathode band marking and supports forward surge current up to 40 A (8.3 ms half-sine).

Thermally, it exhibits R_θJA = 120 °C/W (typ.) on standard 0.2" × 0.2" copper pads and R_θJL = 30 °C/W, enabling reliable operation at T_J ≤ 150 °C. It meets MSL Level 1 (260 °C peak reflow) and is RoHS-compliant with matte tin-plated leads solderable per J-STD-002.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode identified by a band on the body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ47A-E3/5A and 1.5SMC47A, the P4SMA47AHE3_A/H uniquely delivers AEC-Q101 qualification in the smallest surface-mount form factor with full 400 W capability at 47 V, making it the optimal choice for space-limited automotive and industrial modules demanding certified reliability.

Availability

P4SMA47AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and motor control gate drivers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for P4SMA47AHE3_A/H 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

Vishay General Semiconductor designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-performance components for automotive, industrial, and computing markets.

The P4SMA series targets compact, high-surge-capability transient protection in surface-mount formats, specifically engineered for AEC-Q101 compliance and automated assembly in safety-critical and high-volume applications.

FAQ

What is the clamping voltage of the P4SMA47AHE3_A/H at its rated peak pulse current?

The P4SMA47AHE3_A/H has a maximum clamping voltage (V_C) of 64.8 V at its specified peak pulse current (I_PPM) of 6.2 A, measured under the standardized 10/1000 µs waveform. This value is critical for ensuring downstream components-such as 36 V-rated power management ICs-remain within safe operating limits during surge events. The P4SMA47AHE3_A/H achieves this clamping performance while maintaining low incremental surge resistance and fast sub-nanosecond response.

Is the P4SMA47AHE3_A/H suitable for automotive applications?

Yes, the P4SMA47AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix and revision code "_A/H". It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to meet automotive reliability requirements. Its 150 °C maximum junction temperature, MSL Level 1 reflow compatibility, and 400 W surge rating make the P4SMA47AHE3_A/H appropriate for engine control units, body electronics, and ADAS power domains.

What does the "HE3" and "_A/H" suffix in P4SMA47AHE3_A/H indicate?

The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification, while "_A/H" specifies the revision level ("A") and packaging format ("H" = 7-inch tape-and-reel, 1800 units per reel). This ordering code confirms the P4SMA47AHE3_A/H is the automotive-grade version of the P4SMA47A, differentiated from commercial variants like P4SMA47A-E3/61. The full part number ensures traceability to Vishay's qualified production lot and thermal/mechanical specifications.

How does the P4SMA47AHE3_A/H compare to bidirectional TVS diodes in circuit implementation?

The P4SMA47AHE3_A/H is unidirectional and must be oriented with its cathode toward the positive rail-unlike bidirectional types that suppress surges in both polarities. This makes the P4SMA47AHE3_A/H ideal for DC power lines (e.g., 12 V or 48 V buses) where polarity is fixed and forward conduction during fault conditions is acceptable. Its lower leakage and tighter V_BR tolerance versus bidirectional equivalents (e.g., P4SMA47CA) improve efficiency and accuracy in precision sensing paths.

What is the thermal resistance of the P4SMA47AHE3_A/H, and how does it affect PCB layout?

The P4SMA47AHE3_A/H has a typical junction-to-ambient thermal resistance (R_θJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain T_J ≤ 150 °C under worst-case 400 W surge duty, designers must ensure adequate copper area and avoid excessive trace length. The device's R_θJL = 30 °C/W also supports localized heat sinking via thermal vias to inner ground planes-critical for sustained operation in enclosed automotive modules where ambient temperatures exceed 85 °C.