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Vishay General Semiconductor - Diodes Division SM6T68AHM3_B/I
- Part No.:
- SM6T68AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68AHM3_B/I.pdf
- Description:
- 600W,68V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,447
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Product details
Overview
SM6T68AHM3_B/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 68 V breakdown voltage (VBR = 64.6–71.4 V), 58.1 V stand-off voltage (VWM), 92.0 V clamping voltage at 6.5 A (10/1000 μs), and 600 W peak pulse power rating. It protects MOSFETs and ICs against inductive switching transients in automotive power modules.
For engineers reviewing the SM6T68AHM3_B/I datasheet, SM6T68AHM3_B/I pinout, SM6T68AHM3_B/I application, or SM6T68AHM3_B/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, SMB package thermal data, and real-world protection use cases for industrial and automotive electronics design.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, designed to shunt transient energy above VWM = 58.1 V while maintaining low leakage (<1 μA) below that threshold. Its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress.
Rated for 100 A non-repetitive forward surge current (IFSM) and 150 °C max junction temperature, it supports high-reliability deployment on PCBs with 0.2" × 0.2" copper pads per terminal and meets J-STD-020 MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V - defines precise clamping onset range under 1 mA test current |
| VWM | 58.1 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V @ 6.5 A - clamped voltage during 10/1000 μs transient, limiting downstream stress |
| PPPM | 600 W - peak pulse power handling capability for standardized lightning/surge immunity |
| IFSM | 100 A - single half-sine surge rating (10 ms), critical for motor driver and relay coil suppression |
| TJ max | +150 °C - enables operation in under-hood automotive environments without derating |
| RθJA | 100 °C/W - thermal resistance informs board-level heatsinking requirements for sustained power dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE > VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics per stress test requirements |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage exposure to downstream MOSFET gate drivers and logic inputs |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Suppressing load-dump transients on 12 V battery rails in junction boxes and fuse panels. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits voltage to ≤92 V during 12 V system load dump (ISO 16750-2), preventing damage to 100 V-rated buck controllers. | Use Scenario: Protecting gate drivers and bootstrap circuits in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Fast-response clamping device across high-side gate resistor supply rail. Use Value: Clamps inductive kickback from gate loop inductance within nanoseconds, avoiding false turn-on of SiC MOSFETs. |
| Telecom DC Power Input | Consumer Appliance Control Board |
Use Scenario: Safeguarding PoE-powered equipment front-end against Ethernet cable ESD and surge coupling. IC Role / Device Role / Timing Role: Primary transient suppressor on 48 V DC input before DC-DC regulation. Use Value: Withstands 600 W surges per IEC 61000-4-5 Ed.3, meeting EN 61000-6-2 immunity requirements. | Use Scenario: Shielding microcontroller I/O lines and relay coil flyback paths in washing machine control boards. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA at 58.1 V) clamping element on 24 V auxiliary supply rail. Use Value: Prevents latch-up in 3.3 V MCU peripherals during 100 A relay de-energization events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68A-E3/5B | Same VBR range (64.6–71.4 V), but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Not AEC-Q101 qualified; suitable only for commercial-grade consumer/industrial use | Select when cost and board space are prioritized over automotive qualification and 600 W surge margin |
| SMCJ68A-HM3_A/H | Higher PPPM = 1500 W; same SMB package; VBR identical; AEC-Q101 qualified | Designed for harsher surge environments (e.g., ISO 7637-2 Pulse 5b); larger junction area increases capacitance | Choose when system-level testing requires >600 W immunity headroom or higher IPPM tolerance |
Compared with SMAJ68A-E3/5B, SM6T68AHM3_B/I provides +50 % peak power margin and automotive qualification; versus SMCJ68A-HM3_A/H, it trades 900 W pulse capacity for tighter layout fit and lower parasitic capacitance-critical for fast-switching gate drive protection.
Availability
SM6T68AHM3_B/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drives, telecom DC input protection, and consumer appliance control boards requiring stable component supply and AEC-Q101 compliance.
Supply support for SM6T68AHM3_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, TVS devices, and optoelectronics with emphasis on reliability and automotive-grade performance.
The SM6T Series is engineered specifically for high-energy transient suppression in space-constrained, thermally demanding environments-targeting automotive body electronics, industrial automation, and infrastructure power systems.
FAQ
What is the clamping voltage of SM6T68AHM3_B/I at its rated peak pulse current?
The SM6T68AHM3_B/I has a maximum clamping voltage (VC) of 92.0 V at 6.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88385 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM6T68AHM3_B/I maintains this clamping performance across its qualified temperature range and after repeated stress cycles due to its glass-passivated junction.
Is SM6T68AHM3_B/I qualified for automotive applications?
Yes, SM6T68AHM3_B/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024, Doc. #88385). The HM3 designation indicates halogen-free, RoHS-compliant construction with full AEC-Q101 stress testing-including temperature cycling, HTRB, and surge endurance. This makes SM6T68AHM3_B/I suitable for under-hood and chassis-mounted automotive modules where reliability under thermal and mechanical stress is mandatory.
What does the "_B/I" suffix mean in SM6T68AHM3_B/I?
The "_B/I" suffix in SM6T68AHM3_B/I denotes packaging configuration: "B" indicates the revision code (Revision B per Vishay's ordering nomenclature), and "I" specifies the delivery mode-13-inch diameter plastic tape and reel with 3200 units per reel. This matches the ordering example shown in Table "ORDERING INFORMATION" on page 2 of the SM6T datasheet (Doc. #88385), confirming SM6T68AHM3_B/I is a production-ready, reel-packed variant intended for high-volume SMT assembly.
How does the SMB (DO-214AA) package of SM6T68AHM3_B/I compare thermally to SMA or SMC packages?
The SMB package of SM6T68AHM3_B/I offers a thermal resistance (RθJA) of 100 °C/W-lower than SMA (140 °C/W) but higher than SMC (60 °C/W)-when mounted on 0.2" × 0.2" copper pads. This balance allows effective heat dissipation in compact layouts without requiring large thermal pads. Unlike SMC, SMB avoids excessive junction capacitance that could degrade high-speed signal integrity, making SM6T68AHM3_B/I optimal for gate-drive and sensor-line protection where both thermal performance and bandwidth matter.
Can SM6T68AHM3_B/I be used in bidirectional configurations?
No, SM6T68AHM3_B/I is a unidirectional TVS diode, as indicated by the "A" suffix (not "CA") and absence of bidirectional markings in its electrical table. Its cathode band identifies polarity, and it conducts only in reverse breakdown. For bidirectional protection at the same voltage level, Vishay specifies the SM6T68CA variant. Using SM6T68AHM3_B/I in AC-coupled or symmetrical signal lines would require external circuitry (e.g., back-to-back pairing), which is not recommended due to mismatched VBR tolerance and increased board area.
SM6T68AHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T68AHM3_B/I FAQ
1.How can I place an order for SM6T68AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68AHM3_B/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM6T68AHM3_B/I reliable?
The price and inventory of SM6T68AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T68AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68AHM3_B/I?
SM6T68AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68AHM3_B/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM6T68AHM3_B/I?
For technical support, including SM6T68AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68AHM3_B/I requirements.
6.How does Aetrix verify that SM6T68AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T68AHM3_B/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM6T68AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T68AHM3_B/I?
All SM6T68AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68AHM3_B/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM6T68AHM3_B/I part is unused and in its original packaging.
Return procedure for SM6T68AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68AHM3_B/I Tags
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