Vishay General Semiconductor - Diodes Division P6SMB47CAHM3_A/H

Overview

P6SMB47CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P6SMB series, designed for clamping voltage transients on signal or power lines. It features a 47 V standoff voltage (VWM), 64.8 V maximum clamping voltage at 9.3 A peak pulse current, and 600 W peak pulse power capability with a 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.

For engineers reviewing the P6SMB47CAHM3_A/H datasheet, P6SMB47CAHM3_A/H pinout, P6SMB47CAHM3_A/H application, or P6SMB47CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, SMB (DO-214AA) package thermal performance, and compliance with IEC 61000-4-2/4-5 transient immunity requirements.

Technical Context

This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 40.2 V), while the low incremental surge resistance enables rapid energy diversion without voltage overshoot.

The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets J-STD-020 MSL Level 1 and is halogen-free, RoHS-compliant, and AEC-Q101 qualified per ordering suffix HM3.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; symmetrical terminals suitable for AC-coupled or floating signal line protection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ47CA and 1.5KE47CA, P6SMB47CAHM3_A/H delivers optimal balance of 600 W surge capacity, AEC-Q101 qualification, SMB surface-mount compatibility, and thermal performance - making it the preferred choice for new automotive and industrial SMT designs requiring validated reliability and production scalability.

Availability

P6SMB47CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor systems, industrial communication interfaces, telecom line cards, and consumer appliance motor drives requiring stable component supply across multi-year production cycles.

Supply support for P6SMB47CAHM3_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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade validation.

The P6SMB Series targets high-volume transient suppression in automotive, industrial, and telecom applications - engineered for consistent clamping performance, AEC-Q101 compliance, and seamless integration into automated SMT assembly lines.

FAQ

What does the "HM3" suffix indicate in P6SMB47CAHM3_A/H?

The HM3 suffix in P6SMB47CAHM3_A/H denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification - verified per stress tests including temperature cycling, high-temperature reverse bias, and ESD robustness. This makes P6SMB47CAHM3_A/H suitable for automotive under-hood and safety-critical subsystems where material compliance and long-term reliability are mandatory.

Is P6SMB47CAHM3_A/H bidirectional, and how does that affect its placement on a PCB?

Yes, P6SMB47CAHM3_A/H is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. As a result, P6SMB47CAHM3_A/H has no cathode marking and can be placed in either orientation across differential lines or ungrounded signal paths - eliminating orientation errors during automated placement and simplifying layout for AC-coupled interfaces like RS-485 or Ethernet PHYs.

What is the maximum clamping voltage of P6SMB47CAHM3_A/H, and under what test condition is it specified?

The maximum clamping voltage of P6SMB47CAHM3_A/H is 64.8 V, measured at a peak pulse current (IPPM) of 9.3 A using the standardized 10/1000 μs double-exponential waveform. This value reflects worst-case voltage seen by protected circuitry during surge events and is guaranteed across the full operating temperature range (−65 °C to +150 °C), ensuring consistent protection margins in extreme environments.

How does the SMB (DO-214AA) package of P6SMB47CAHM3_A/H compare thermally to larger packages like DO-214AB?

The SMB (DO-214AA) package of P6SMB47CAHM3_A/H offers a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads - higher than DO-214AB's ~70 °C/W but optimized for high-density SMT layouts. Its compact size maintains adequate thermal dissipation for 600 W single-pulse events, and the low-profile design supports conformal coating and mechanical shielding in space-constrained automotive ECUs.

Can P6SMB47CAHM3_A/H replace unidirectional TVS diodes like P6SMB47A in existing designs?

No - P6SMB47CAHM3_A/H is strictly bidirectional and cannot substitute for unidirectional variants like P6SMB47A without circuit review. Unidirectional types require correct anode/cathode orientation and conduct forward current during positive surges, whereas P6SMB47CAHM3_A/H clamps equally in both directions. Replacing one with the other may cause unintended conduction or failure to suppress certain transient polarities; always verify schematic topology and signal grounding before substitution.