Vishay General Semiconductor - Diodes Division P6SMB47CAHM3_B/H

Overview

P6SMB47CAHM3_B/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 40.2 V stand-off voltage (VWM), 44.7–49.4 V breakdown voltage (VBR) at 1 mA, 64.8 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power capability with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.

For engineers reviewing the P6SMB47CAHM3_B/H datasheet, P6SMB47CAHM3_B/H pinout, P6SMB47CAHM3_B/H application, or P6SMB47CAHM3_B/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.

Technical Context

This device operates as a voltage-clamping protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMB package supports high surge current handling (9.3 A IPPM) without thermal runaway under repetitive 0.01% duty cycle conditions.

The P6SMB47CAHM3_B/H meets J-STD-020 MSL Level 1 (peak reflow 260 °C), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is halogen-free and RoHS-compliant per Vishay HM3 suffix designation. Its temperature coefficient of VBR is +0.101 %/°C, enabling predictable clamping over -65 °C to +150 °C operating range.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); molded compound meets UL 94 V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ47CA, the P6SMB47CAHM3_B/H delivers 50% higher surge power handling in a compact SMB form factor; versus SMCJ47CA, it trades 2.5× peak power for 3.3× smaller board area and simplified thermal layout - ideal for space-constrained automotive modules requiring AEC-Q101 compliance.

Availability

P6SMB47CAHM3_B/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom data line protection, and consumer USB port hardening requiring stable component supply and long-term lifecycle support.

Supply support for P6SMB47CAHM3_B/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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.

The P6SMB Series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for robustness under harsh electrical and thermal conditions with AEC-Q101 qualification and MSL Level 1 assembly compatibility.

FAQ

What does the "CA" suffix indicate in P6SMB47CAHM3_B/H?

The "CA" suffix denotes a bidirectional configuration, meaning the P6SMB47CAHM3_B/H provides symmetrical clamping for both positive- and negative-going transients without polarity dependence. This eliminates the need for orientation-aware placement and simplifies design for AC-coupled or floating signal lines, unlike unidirectional variants (e.g., P6SMB47AHM3_B/H) that require cathode alignment.

Is P6SMB47CAHM3_B/H suitable for automotive applications?

Yes, P6SMB47CAHM3_B/H is AEC-Q101 qualified (indicated by the HM3_B/H suffix), having passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD. It is explicitly intended for automotive subsystems such as body control modules, infotainment interfaces, and ADAS sensor protection where reliability under extended temperature ranges (-65 °C to +150 °C) is mandatory.

How does the SMB package of P6SMB47CAHM3_B/H compare to SMA or SMC in thermal performance?

The SMB (DO-214AA) package of P6SMB47CAHM3_B/H offers RθJA = 100 °C/W with recommended 0.2" × 0.2" copper pads - balancing compact size and thermal capability. In contrast, SMA has higher RθJA (~150 °C/W) limiting power handling, while SMC achieves RθJA ≈ 30 °C/W but occupies ~2.5× more board area. The P6SMB47CAHM3_B/H thus delivers optimal surge density for space-constrained automotive PCBs.

What is the maximum clamping voltage of P6SMB47CAHM3_B/H under surge conditions?

The maximum clamping voltage (VC) of P6SMB47CAHM3_B/H is 64.8 V at 9.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value represents the highest voltage imposed on the protected circuit during standardized surge testing and is critical for ensuring downstream components (e.g., 75 V-rated MOSFETs or 60 V LDOs) remain within safe operating limits.

Does P6SMB47CAHM3_B/H require special PCB layout considerations?

Yes, P6SMB47CAHM3_B/H requires minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W peak pulse power and maintain RθJA = 100 °C/W. Traces should be short and wide to minimize inductance, and ground connections must be low-impedance to ensure effective transient shunting. Avoid thermal relief spokes on pads, as they degrade surge current handling.