Taiwan Semiconductor Corporation P6SMB56C

Overview

P6SMB56C from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 56V, clamping voltage of 80.5V at 7.8A peak pulse current, and DO-214AA (SMB) package. It protects DC power rails in switching mode power supplies, adapters, and display electronics against ESD and surge events per ISO 7637-2 Pulse 1/2a/2b/3a/3b.

For engineers reviewing the P6SMB56C datasheet, P6SMB56C pinout, P6SMB56C application, or P6SMB56C equivalent, key selection criteria include its 56V standoff capability, sub-1ps response time, <1μA leakage above 45.4V, unidirectional/bidirectional configuration flexibility via C/CA suffix, and compliance with J-STD-020 Level 1 moisture sensitivity.

Technical Context

The P6SMB56C operates as a silicon avalanche diode configured for bidirectional transient suppression, enabling symmetrical clamping in AC-coupled or floating signal paths. Its glass-passivated junction ensures stable V_BR tolerance (±5% for 'A' variants, ±10% for non-A), while thermal resistance values (R_θJA = 55°C/W, R_θJC = 10°C/W) support reliable operation up to 150°C junction temperature.

Designed for 10/1000μs surge waveforms, it delivers 600W non-repetitive peak pulse power with clamping voltage tightly bounded at 80.5V - critical for safeguarding 48V industrial bus interfaces and 5V–24V logic supply rails. Its low-profile SMB package enables automated placement without compromising surge robustness.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode-banded monolithic silicon TVS diode. Polarity marked by molded cathode band; terminals are matte tin-plated for J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ56CA and 1.5SMC56CA, the P6SMB56C offers the tightest clamping voltage (80.5V) in the smallest standardized surface-mount package, making it optimal for 48V DC distribution nodes where PCB real estate and voltage margin are both critical constraints.

Availability

P6SMB56C is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat panel display power rails requiring stable component supply and full traceability through production cycles.

Supply support for P6SMB56C 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.

The P6SMB series belongs to TSC's high-reliability surface-mount TVS portfolio, engineered specifically for automotive-grade surge immunity (ISO 7637-2), industrial power conversion, and consumer electronics ESD protection with strict process control on glass passivation and junction uniformity.

FAQ

What is the breakdown voltage tolerance for P6SMB56C?

The P6SMB56C has a minimum breakdown voltage (V_BR) of 50.4V and maximum of 61.6V at 1mA test current, corresponding to a ±10% tolerance. This is confirmed in the Electrical Specifications table for non-'A' variants; the 'C' suffix denotes bidirectional configuration but does not alter V_BR tolerance. The P6SMB56C datasheet specifies these values under Note 1, measured after 30ms square-wave pulse application.

Is P6SMB56C unidirectional or bidirectional?

P6SMB56C is a bidirectional TVS diode, indicated by the 'C' suffix per TSC's ordering convention. Unlike unidirectional variants (e.g., P6SMB56), the P6SMB56C provides symmetrical clamping in both polarities - essential for protecting AC-coupled signals, floating grounds, or differential buses. Its marking code is MHJ, and polarity band serves only mechanical orientation reference, not functional directionality.

What is the maximum clamping voltage of P6SMB56C and under what test condition?

The maximum clamping voltage (V_C) of P6SMB56C is 80.5V, measured at a peak pulse current (I_PPM) of 7.8A using the standardized 10/1000μs double-exponential waveform. This value is specified in the Electrical Specifications table and reflects worst-case voltage seen by protected circuitry during surge events, directly enabling safe margining for 48V-rated components.

Does P6SMB56C meet automotive surge standards?

Yes, P6SMB56C meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). This compliance is explicitly stated in the FEATURES section and validated by its 600W PPPSM rating and clamping performance under defined waveform conditions - making it suitable for infotainment power supplies and body-control module interfaces.

What is the thermal resistance and maximum junction temperature of P6SMB56C?

P6SMB56C has a junction-to-ambient thermal resistance (R_θJA) of 55°C/W and junction-to-case resistance (R_θJC) of 10°C/W, with a maximum rated junction temperature (T_J) of +150°C. These values are listed in the THERMAL PERFORMANCE section and enable thermal design validation for continuous operation in enclosed adapters or industrial enclosures up to 85°C ambient, assuming adequate PCB copper area.