Taiwan Semiconductor Corporation P6SMB170CAH

Overview

P6SMB170CAH from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with a minimum breakdown voltage of 162 V, maximum clamping voltage of 234 V at 2.6 A peak pulse current, and standoff voltage of 145 V. It protects automotive and industrial circuits against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the P6SMB170CAH datasheet, P6SMB170CAH pinout, P6SMB170CAH application, or P6SMB170CAH equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, 150°C junction rating, and compatibility with automated SMT placement on high-reliability PCBs.

Technical Context

This device operates as a voltage-clamped surge protector using an avalanche breakdown mechanism. Its bidirectional configuration enables symmetrical clamping in both polarities without external polarity management, and its glass-passivated junction ensures stable leakage (<1 µA at 145 V) and fast response (<1.0 ps rise time from 0 V to V_BR min).

Thermal design is supported by R_θJC = 10°C/W and R_θJA = 55°C/W, enabling reliable operation up to T_J = 150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, confirming suitability for reflow-soldered automotive modules.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode band marking; dual-terminal construction with no internal polarity distinction for bidirectional operation. Matte tin-plated leads meet J-STD-002 solderability requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ170CA and 1.5SMC170CA, P6SMB170CAH delivers tighter clamping (234 V), AEC-Q101 qualification out-of-box, and MSL-1 handling - making it optimal for cost-sensitive, high-volume automotive modules where reliability and manufacturability are co-prioritized.

Availability

P6SMB170CAH is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog inputs, LED lighting drivers, and infotainment USB ports requiring stable component supply across production lifecycles.

Supply support for P6SMB170CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and AEC-Q101-compliant production lines.

The P6SMB series targets automotive and industrial transient protection, designed specifically to meet ISO 7637-2 and AEC-Q101 requirements in compact SMB packages without sacrificing clamping performance or thermal robustness.

FAQ

What does the 'CAH' suffix indicate in P6SMB170CAH?

The 'CAH' suffix denotes a bidirectional configuration with A-grade tolerance (±5% V_BR) and halogen-free construction. Unlike unidirectional 'H' variants, P6SMB170CAH provides symmetrical clamping in both voltage polarities - essential for protecting AC-coupled or floating signal lines without polarity constraints. This makes P6SMB170CAH ideal for automotive data buses and sensor interfaces where voltage reversal is possible.

Is P6SMB170CAH suitable for ISO 7637-2 Pulse 1 (load dump) protection?

Yes, P6SMB170CAH is explicitly rated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms. Its 600 W peak pulse power rating and 234 V clamping voltage at 2.6 A ensure effective suppression of 12 V system load dump transients (up to ±170 V) while maintaining safe margins below typical 36 V-rated downstream ICs. The device's 150°C T_J rating further supports sustained operation in under-hood environments where Pulse 1 events may occur repeatedly.

How does P6SMB170CAH compare to unidirectional P6SMB170H in terms of leakage and clamping?

P6SMB170CAH exhibits identical V_WM (145 V), V_BR (162–179 V), and V_C (234 V @ 2.6 A) specifications as its unidirectional counterpart P6SMB170H, with leakage remaining <1 µA at V_WM. The core difference is functional: P6SMB170CAH clamps equally in both directions, whereas P6SMB170H only protects against reverse-polarity surges. Thus, P6SMB170CAH replaces two unidirectional devices in differential or AC-coupled paths - reducing BOM count and PCB area without compromising protection integrity.

What is the thermal resistance profile of P6SMB170CAH, and how does it affect PCB layout?

P6SMB170CAH has R_θJC = 10°C/W and R_θJA = 55°C/W (standard FR-4, 1-in² copper). This means a 2.6 A 10/1000 µs surge generates ~6.8 W·s of energy, causing minimal steady-state heating - but repeated surges require adequate copper pour under the cathode/anode pads. For automotive applications, use ≥0.5 mm wide traces and ≥1 cm² thermal pad connected to internal ground plane to maintain T_J < 150°C. The low R_θJA confirms P6SMB170CAH's suitability for compact, thermally constrained layouts common in ECU modules.

Does P6SMB170CAH require special handling or baking before reflow soldering?

No - P6SMB170CAH is rated Moisture Sensitivity Level 1 (per J-STD-020), meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into standard lead-free reflow profiles (e.g., JEDEC J-STD-020D) without baking or dry-pack requirements. This eliminates pre-reflow processing steps, reduces manufacturing cycle time, and lowers risk of popcorn cracking. The device's DO-214AA molding compound also meets UL 94V-0 flammability, supporting safety-critical automotive deployments without additional conformal coating.