Vishay General Semiconductor - Diodes Division P6SMB39CAHE3_B/H

Overview

P6SMB39CAHE3_B/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 33.3 V standoff voltage (V_WM), 37.1–41.0 V breakdown voltage (V_BR) at 1 mA, 53.9 V maximum clamping voltage (V_C) at 11.1 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.

For engineers reviewing the P6SMB39CAHE3_B/H datasheet, P6SMB39CAHE3_B/H pinout, P6SMB39CAHE3_B/H application, or P6SMB39CAHE3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 150 °C max junction temperature, 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-clamped shunt protector: during overvoltage events exceeding V_WM, it avalanches symmetrically in both directions to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the SMB package supports high thermal dissipation (R_θJA = 100 °C/W) under repetitive 0.01% duty cycle pulses.

Designed for unclamped inductive switching and lightning-induced surges, it delivers consistent clamping performance across -65 °C to +150 °C operating range and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, dimensions 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ33CA and 1.5KE39CA, P6SMB39CAHE3_B/H uniquely balances 600 W surge capability, AEC-Q101 qualification, and SMB SMT compatibility-making it optimal for new automotive and industrial designs requiring automated assembly and validated reliability.

Availability

P6SMB39CAHE3_B/H is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, telecom line protection, and consumer appliance motor drives requiring stable component supply and long-term lifecycle support.

Supply support for P6SMB39CAHE3_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, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade solutions.

The P6SMB Series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where repeatable clamping performance and AEC-Q101 validation are mandatory.

FAQ

What does the "CA" suffix indicate in P6SMB39CAHE3_B/H?

The "CA" suffix denotes a bidirectional configuration: P6SMB39CAHE3_B/H conducts symmetrically in both directions, making it suitable for AC-coupled or floating signal lines such as CAN bus, USB, or telecom interfaces. Unlike unidirectional variants (e.g., P6SMB39A), it has no cathode marking and provides identical clamping behavior regardless of voltage polarity applied across its terminals.

Is P6SMB39CAHE3_B/H qualified for automotive use?

Yes, P6SMB39CAHE3_B/H is AEC-Q101 qualified, as confirmed by the "HE3_B" suffix per Vishay's ordering nomenclature. This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and mechanical shock - validating its suitability for under-hood and cabin electronics in passenger vehicles and commercial vehicles.

What is the maximum clamping voltage of P6SMB39CAHE3_B/H under surge conditions?

The maximum clamping voltage (V_C) of P6SMB39CAHE3_B/H is 53.9 V at 11.1 A peak pulse current (I_PPM) with a 10/1000 μs waveform. This value represents the upper limit of voltage imposed on protected circuitry during standardized surge events and is measured per JEDEC standards using specified test conditions and PCB pad layout (0.2" × 0.2" copper).

How does P6SMB39CAHE3_B/H compare to unidirectional P6SMB39AHE3_B/H in circuit implementation?

P6SMB39CAHE3_B/H replaces two unidirectional TVS diodes in series-opposed configuration with a single device, simplifying layout and reducing BOM count. While P6SMB39AHE3_B/H requires correct polarity alignment (cathode toward positive rail), P6SMB39CAHE3_B/H eliminates orientation dependency - critical for differential signaling and space-constrained PCBs where routing symmetry matters.

What thermal derating applies to P6SMB39CAHE3_B/H above 25 °C ambient?

P6SMB39CAHE3_B/H follows Vishay's standard derating curve: peak pulse power decreases linearly above 25 °C ambient, reaching ~50% of 600 W at 100 °C junction temperature. Derating is governed by Fig. 2 in the datasheet (Document Number 88370), with R_θJA = 100 °C/W and R_θJL = 20 °C/W defining thermal limits under defined PCB copper pad conditions (0.2" × 0.2" per terminal).