Vishay General Semiconductor - Diodes Division SM6T200AHM3_B/I

Overview

SM6T200AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, rated for 200 V standoff voltage (VWM = 171 V), 274 V clamping voltage at 2.2 A (10/1000 μs), 600 W peak pulse power, and AEC-Q101 qualified for automotive applications. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients.

For engineers reviewing the SM6T200AHM3_B/I datasheet, SM6T200AHM3_B/I pinout, SM6T200AHM3_B/I application, or SM6T200AHM3_B/I equivalent, key selection criteria include unidirectional polarity, 171 V stand-off rating, 274 V clamping at 2.2 A, SMB package thermal resistance (RθJA = 100 °C/W), and halogen-free RoHS-compliant construction with AEC-Q101 qualification.

Technical Context

The SM6T200AHM3_B/I operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its breakdown threshold (VBR min = 190 V, max = 210 V at 1 mA). Its low-inductance SMB package enables fast response to transient events with 10/1000 μs waveform compliance.

Designed for automotive-grade reliability, it features glass-passivated junction, meets MSL Level 1 (260 °C reflow), and supports continuous operation up to TJ = 150 °C. The cathode band denotes polarity, and it delivers 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band marks terminal 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ200A-E3/5B and SMCJ200A-M3/5B, the SM6T200AHM3_B/I delivers optimal balance of automotive qualification, SMB footprint constraint, and 600 W surge capacity-making it preferred for space-constrained automotive body control modules where AEC-Q101 compliance and thermal performance are jointly critical.

Availability

SM6T200AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.

Supply support for SM6T200AHM3_B/I 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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.

The SM6T Series was engineered for robust, surface-mount transient suppression in automotive, industrial, and consumer systems-prioritizing low-profile packaging, high surge capability, and qualification to stringent environmental standards.

FAQ

What is the clamping voltage of the SM6T200AHM3_B/I under a 10/1000 μs surge?

The SM6T200AHM3_B/I has a maximum clamping voltage (VC) of 274 V when subjected to a 10/1000 μs waveform at an IPPM of 2.2 A. This value is measured per Figure 1 in the official Vishay datasheet (Document Number: 88385, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SM6T200AHM3_B/I maintains this clamping performance across its qualified operating temperature range.

Is the SM6T200AHM3_B/I suitable for automotive applications?

Yes, the SM6T200AHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in the Vishay SM6T Series datasheet. It meets automotive reliability requirements including temperature cycling, humidity testing, and mechanical shock. Its 150 °C maximum junction temperature, MSL Level 1 reflow compatibility, and halogen-free RoHS compliance make the SM6T200AHM3_B/I appropriate for under-hood and body-control module deployments.

What does the "HM3_B/I" suffix indicate in SM6T200AHM3_B/I?

The "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction; "B" is the revision code; and "I" specifies 13-inch tape-and-reel packaging with 3200 units per reel. This ordering code aligns with Vishay's documented format in the SM6T Series datasheet (page 2, Ordering Information section), confirming that SM6T200AHM3_B/I is a production-ready, automotive-grade variant with full traceability and packaging consistency.

How does the thermal resistance of the SM6T200AHM3_B/I affect PCB layout?

The SM6T200AHM3_B/I has a typical RθJA of 100 °C/W, meaning junction temperature rises 100 °C per watt dissipated without heatsinking. To maintain safe operation, PCB layout must use minimum recommended copper pads (0.2" × 0.2" per terminal, per datasheet Fig. 2), avoid thermal isolation, and consider ambient derating above 25 °C. Proper layout ensures the SM6T200AHM3_B/I sustains its 5.0 W steady-state power rating and avoids premature thermal shutdown during repeated surges.

Can the SM6T200AHM3_B/I be used in bidirectional configurations?

No, the SM6T200AHM3_B/I is unidirectional only, as indicated by its "A" suffix and absence of "CA" in the part number. Bidirectional variants require the "CA" suffix (e.g., SM6T200CA). Using the SM6T200AHM3_B/I in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit. Always verify polarity marking-the cathode band on the SM6T200AHM3_B/I must face the protected line.