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Vishay General Semiconductor - Diodes Division SM6T39AHM3_B/H
- Part No.:
- SM6T39AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHM3_B/H.pdf
- Description:
- 600W,39V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,346
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Product details
Overview
SM6T39AHM3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 39 V breakdown voltage (VBR = 37.1–41.0 V at 1.0 mA), 53.9 V clamping voltage (VC) at 11.1 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It provides robust ESD and surge protection for automotive sensor signal lines, MOSFET gate drivers, and industrial I/O interfaces.
For engineers reviewing the SM6T39AHM3_B/H datasheet, SM6T39AHM3_B/H pinout, SM6T39AHM3_B/H application, or SM6T39AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.38), and thermal resistance (RθJA = 100 °C/W) under standard PCB mounting.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, activating when transient voltage exceeds its stand-off voltage (VWM = 33.3 V). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while low inductance supports fast response to sub-microsecond transients.
The device is qualified to AEC-Q101 for automotive use and features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Its SMB package meets UL 94 V-0 flammability rating and MSL level 1 (peak reflow 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise conduction onset for reliable overvoltage thresholding |
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - clamping voltage limits downstream IC stress during surge events |
| PPPM | 600 W - peak transient power handling capacity under standardized surge waveform |
| IFSM | 100 A - single half-sine surge current rating (10 ms), critical for inductive load switching protection |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band on case body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VIN > VBR |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial supply chains |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot across protected ICs during transient suppression |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without dry-pack or baking preconditioning |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low leakage under thermal stress |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤53.9 V, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and electrostatic discharge. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on 24 V DC input channels. Use Value: Absorbs 600 W surges per IEC 61000-4-5 (10/1000 μs), enabling robust Class III immunity without external crowbar circuits. |
| MOSFET Gate Driver Protection | Consumer Power Adapter ESD Guard |
Use Scenario: Shielding high-side N-channel MOSFET gates from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Fast-response clamp between gate and source terminals. Use Value: Sub-100 ns response time and low capacitance (<100 pF) prevent gate oscillation while limiting VGS to safe levels. | Use Scenario: Adding secondary-level ESD protection on USB-C and barrel jack inputs of AC/DC adapters. IC Role / Device Role / Timing Role: Secondary TVS after primary MOV/fuse, targeting human-body-model (HBM) and IEC 61000-4-2 events. Use Value: 1.0 μA max reverse leakage at 33.3 V ensures no standby current penalty; halogen-free construction meets regional eco-regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39A | Same VBR range (37.1–41.0 V), but lower PPPM = 400 W; SMA package (larger RθJA = 130 °C/W) | Not AEC-Q101 qualified; suitable only for commercial-grade consumer/industrial use | Select when cost sensitivity outweighs automotive qualification and higher surge margin |
| SMCJ39A | Higher PPPM = 1500 W; larger SMC package (DO-214AB); same VBR, VC, and AEC-Q101 option available | Requires more PCB area; better suited for high-energy industrial motor drives | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 (4 kV line-earth) |
Compared with SMAJ39A and SMCJ39A, SM6T39AHM3_B/H delivers optimal balance of automotive qualification, compact SMB footprint, and 600 W surge capability-making it ideal for space-constrained, AEC-Q101–mandated applications where thermal performance and regulatory compliance are jointly critical.
Availability
SM6T39AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer power adapter designs requiring stable component supply with full traceability and lifecycle management.
Supply support for SM6T39AHM3_B/H 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, efficiency, and application-specific optimization.
The SM6T Series is designed specifically for board-level transient suppression in automotive, industrial, and computing systems-emphasizing AEC-Q101 compliance, low clamping voltage, and robust surge handling in compact surface-mount packages.
FAQ
What is the exact breakdown voltage tolerance for SM6T39AHM3_B/H?
The SM6T39AHM3_B/H has a specified breakdown voltage (VBR) range of 37.1 V to 41.0 V at 1.0 mA test current, per Vishay's datasheet revision 09-Jan-2024. This ±5.5% tolerance ensures consistent clamping behavior across production lots and supports reliable overvoltage threshold design in automotive and industrial circuits using SM6T39AHM3_B/H.
Is SM6T39AHM3_B/H suitable for bidirectional transient protection?
No, SM6T39AHM3_B/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the SM6T39CA variant (with "CA" suffix). Using SM6T39AHM3_B/H in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
Does SM6T39AHM3_B/H require derating at elevated ambient temperatures?
Yes, SM6T39AHM3_B/H must be derated above TA = 25 °C per Figure 2 in the datasheet. At 85 °C ambient, its peak pulse power drops to ~420 W (70% of 600 W), and at 125 °C, it falls to ~240 W (40%). Designers must apply this derating when specifying SM6T39AHM3_B/H for under-hood or enclosed industrial environments.
What is the meaning of the "HM3_B/H" suffix in SM6T39AHM3_B/H?
The "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction; "B/H" specifies packaging: 7″ tape-and-reel, 750 units per reel, with "H" as the preferred package code. This suffix confirms SM6T39AHM3_B/H meets automotive-grade material and assembly requirements, distinguishing it from commercial-grade variants like SM6T39A-E3.
Can SM6T39AHM3_B/H replace SMAJ39A in an existing design without layout changes?
No-although both are unidirectional 39 V TVS diodes, SM6T39AHM3_B/H uses the SMB (DO-214AA) package while SMAJ39A uses SMA (DO-214AC). Their footprints differ: SMB has 3.94 mm length vs. SMA's 4.57 mm, and pad layouts are not interchangeable. Replacing SMAJ39A with SM6T39AHM3_B/H requires PCB land pattern revision to accommodate the smaller SMB outline.
SM6T39AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 11.1A
- 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)
SM6T39AHM3_B/H FAQ
1.How can I place an order for SM6T39AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHM3_B/H 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 SM6T39AHM3_B/H reliable?
The price and inventory of SM6T39AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T39AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHM3_B/H?
SM6T39AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHM3_B/H 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 SM6T39AHM3_B/H?
For technical support, including SM6T39AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHM3_B/H requirements.
6.How does Aetrix verify that SM6T39AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T39AHM3_B/H 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 SM6T39AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T39AHM3_B/H?
All SM6T39AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHM3_B/H, 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 SM6T39AHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T39AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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