Vishay General Semiconductor - Diodes Division P6SMB56CA-M3/52

Overview

P6SMB56CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in signal and power lines. It features a 56 V breakdown voltage (V_BR = 53.2–58.8 V at I_T = 1.0 mA), 77.0 V maximum clamping voltage (V_C) at 7.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.

For engineers reviewing the P6SMB56CA-M3/52 datasheet, P6SMB56CA-M3/52 pinout, P6SMB56CA-M3/52 application, or P6SMB56CA-M3/52 equivalent, this device delivers verified bidirectional clamping performance, halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness - critical for ESD/surge hardening of low-voltage analog and digital signal paths without polarity constraints.

Technical Context

The P6SMB56CA-M3/52 operates as a symmetric, bidirectional avalanche diode with no polarity marking, enabling identical clamping behavior in both directions. Its glass-passivated junction ensures stable V_BR tolerance (±5%) and low incremental surge resistance, supporting fast transient response (<1 ns) to ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).

Thermally, it uses an SMB (DO-214AA) package with R_θJA = 100 °C/W and R_θJL = 20 °C/W, rated for T_J up to +150 °C. The 5.0 W steady-state power dissipation and 0.01% duty cycle limit define its repetitive surge capability under controlled PCB copper pad layout (0.2" × 0.2").

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ58A-E3/52 and SMCJ58CA, the P6SMB56CA-M3/52 offers optimal balance of bidirectional flexibility, 47.8 V standoff headroom for 48 V rails, compact SMB footprint, and halogen-free compliance - making it preferred for space-constrained, polarity-agnostic, and automotive-adjacent applications.

Availability

P6SMB56CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line hardening requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.

Supply support for P6SMB56CA-M3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.

The P6SMB Series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and communications equipment - delivering standardized 600 W surge capability in compact SMB packages with scalable voltage options and qualification-ready variants.

FAQ

What does the "CA" suffix indicate in P6SMB56CA-M3/52?

The "CA" suffix in P6SMB56CA-M3/52 denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities without requiring orientation during placement. This eliminates polarity-check steps in automated assembly and simplifies protection of AC-coupled or differential signal lines - a key distinction from unidirectional "A"-suffix variants like P6SMB56A-M3/52.

Is P6SMB56CA-M3/52 qualified to AEC-Q101?

P6SMB56CA-M3/52 is halogen-free and RoHS-compliant per its M3 suffix, and belongs to the P6SMB family for which AEC-Q101 qualification is available via alternate ordering codes (e.g., P6SMB56CAHM3_B/H). While the M3/52 variant itself is not pre-certified, its construction and test flow align with AEC-Q101 requirements - enabling qualification support upon customer request and program engagement for automotive applications.

What is the maximum clamping voltage of P6SMB56CA-M3/52 under surge conditions?

The maximum clamping voltage (V_C) of P6SMB56CA-M3/52 is 77.0 V at 7.8 A peak pulse current (I_PPM) with a 10/1000 μs waveform. This value is guaranteed across temperature and production lot, ensuring downstream 48 V-rated ICs remain within safe operating voltage limits during surge events - critical for protecting CAN transceivers, microcontroller I/O, and analog front-ends.

Can P6SMB56CA-M3/52 replace P6SMB56A-M3/52 in an existing design?

Yes, P6SMB56CA-M3/52 can replace P6SMB56A-M3/52 in most cases, but only if the circuit requires bidirectional protection. Since P6SMB56A-M3/52 is unidirectional (cathode-banded), substituting the CA version removes polarity dependency - beneficial for differential lines or uncertain signal direction. However, verify that the higher reverse leakage (1.0 μA vs. 1.0 μA - same spec) and identical V_BR/V_C meet system leakage budgets.

What PCB pad layout is recommended for optimal thermal and surge performance of P6SMB56CA-M3/52?

Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal for P6SMB56CA-M3/52 to achieve rated 600 W pulse power and thermal resistance (R_θJA = 100 °C/W). Use solid internal ground/power planes connected via multiple vias, avoid narrow traces between pads, and ensure solder mask clearance matches the SMB outline - deviations reduce surge handling and accelerate thermal derating above 25 °C ambient.