Taiwan Semiconductor Corporation P6SMB47C

Overview

P6SMB47C from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power lines and signal paths. It features a standoff voltage of 38.1 V, breakdown voltage range of 42.3–51.7 V at 1 mA, clamping voltage of 67.8 V at 9.2 A peak pulse current, and operates across –55°C to +150°C junction temperature. It is used in switching mode power supplies and consumer displays to absorb ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the P6SMB47C datasheet, P6SMB47C pinout, P6SMB47C application, or P6SMB47C equivalent, key selection criteria include bidirectional clamping performance, DO-214AA package compatibility with automated SMT assembly, low leakage (<1 µA @ 38.1 V), and compliance with automotive transient immunity standards.

Technical Context

The P6SMB47C implements a glass-passivated silicon avalanche junction optimized for fast response (<1.0 ps rise time from 0 V to V_BR(min)) and stable clamping under repetitive surge stress. Its unidirectional counterpart is P6SMB47, while the "C" suffix explicitly denotes bidirectional configuration - electrical characteristics apply identically in both polarities.

Thermal design relies on R_θJC = 10°C/W and R_θJA = 55°C/W, enabling 3 W steady-state dissipation at T_A = 25°C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow without preconditioning.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means band denotes reference terminal, not polarity direction). Weight: 0.090 g. Meets UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ47CA and 1.5SMC47CA, the P6SMB47C offers optimal cost-performance balance for non-automotive industrial and consumer applications where DO-214AA footprint and 600 W rating meet system-level surge requirements without over-engineering.

Availability

P6SMB47C is available at Aetrix Electronics and suitable for switching mode power supplies, consumer display interfaces, and industrial monitor power inputs requiring stable component supply, consistent parametric performance, and full traceability through J-STD-020 Level 1 moisture handling.

Supply support for P6SMB47C 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 for industrial and consumer markets.

The P6SMB series was developed to deliver high-reliability, low-cost transient protection in standardized SMB packages for high-volume SMT applications - emphasizing automated manufacturability, ISO 7637-2 compliance, and thermal robustness in compact form factors.

FAQ

What does the "C" suffix signify in P6SMB47C?

The "C" suffix in P6SMB47C explicitly denotes bidirectional configuration. Unlike unidirectional P6SMB47, the P6SMB47C provides symmetrical avalanche clamping in both forward and reverse directions, with identical V_BR, V_C, and I_PPM values regardless of voltage polarity. This eliminates polarity-sensitive routing in AC-coupled or floating-bus designs and is confirmed in the device's Electrical Specifications table under "Devices for Bipolar Applications."

Does P6SMB47C meet automotive transient standards?

Yes, P6SMB47C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for 12 V and 24 V vehicle electrical systems, as stated in its FEATURES section. However, it is not AEC-Q200 qualified - for automotive production programs requiring formal qualification, alternatives like SMBJ47CA should be considered. The P6SMB47C remains suitable for automotive aftermarket, infotainment prototyping, and non-safety-critical subsystems where standard compliance suffices.

What is the maximum clamping voltage of P6SMB47C under surge conditions?

The maximum clamping voltage of P6SMB47C is 67.8 V, measured at 9.2 A peak pulse current using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage the protected circuit will experience during a worst-case transient event. It is derived directly from the ELECTRICAL SPECIFICATIONS table for P6SMB47 and applies identically to P6SMB47C due to shared bidirectional parameter definitions.

Can P6SMB47C replace P6SMB47 in an existing design?

No - P6SMB47C cannot directly replace unidirectional P6SMB47 without circuit review. Although both share identical V_WM, V_BR, and V_C values, the P6SMB47C's bidirectional behavior means it conducts in both directions above V_BR, whereas P6SMB47 only clamps in reverse. Using P6SMB47C in a unidirectional application may cause unintended conduction during normal forward bias, risking damage or malfunction. Layout and schematic validation are required before substitution.

What is the thermal resistance profile of P6SMB47C?

P6SMB47C has a junction-to-case thermal resistance (R_θJC) of 10°C/W and junction-to-ambient thermal resistance (R_θJA) of 55°C/W, as specified in the THERMAL PERFORMANCE section. These values enable 3 W steady-state power dissipation at T_A = 25°C and support operation up to +150°C junction temperature. PCB copper area and airflow must be designed to maintain T_J ≤ 150°C under worst-case surge repetition rates, especially in enclosed industrial enclosures.