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Vishay General Semiconductor - Diodes Division SM6T39AHM3_B/I
- Part No.:
- SM6T39AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHM3_B/I.pdf
- Description:
- 600W,39V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,733
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Product details
Overview
SM6T39AHM3_B/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 53.9 V maximum clamping voltage (VC) at 11.1 A peak pulse current, and 600 W peak pulse power capability with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O interfaces, and power supply rail protection.
For engineers reviewing the SM6T39AHM3_B/I datasheet, SM6T39AHM3_B/I pinout, SM6T39AHM3_B/I application, or SM6T39AHM3_B/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction, low-inductance SMB package, and verified clamping performance under repetitive transients per IEC 61000-4-5.
Technical Context
The SM6T39AHM3_B/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to deliver fast response (<1 ns) to ESD and surge events. Its clamping action begins at VBR = 37.1–41.0 V and limits transient voltage to ≤53.9 V at IPPM = 11.1 A (10/1000 μs), enabling reliable protection of downstream MOSFETs and ICs without latch-up risk.
Thermally, it supports operation from –65 °C to +150 °C junction temperature, with RθJA = 100 °C/W and RθJL = 20 °C/W. The device is rated for 100 A non-repetitive forward surge (IFSM, 10 ms half-sine) and dissipates up to 5.0 W continuously at TA = 50 °C on infinite heatsink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33.3 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 37.1–41.0 V at IT = 1.0 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | 53.9 V at IPPM = 11.1 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case surge |
| PPPM (Peak Pulse Power) | 600 W - Sustains standardized lightning/surge pulses per IEC 61000-4-5 without failure |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Negligible standby power loss and signal integrity impact in high-impedance circuits |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line ground or low-side reference | Completes conduction path during transient clamp; must be routed with low-inductance trace to minimize overshoot |
| Cathode | Current exit terminal in forward bias; connected to protected IC/MOSFET input or supply rail | Defines clamping reference point; band-marked end ensures correct PCB orientation and functional polarity |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Withstands Level 4 IEC 61000-4-5 surges (4 kV line-to-earth) without degradation when mounted per recommended pad layout |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring zero-failure field reliability |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh industrial environments |
| Low inductance SMB package | Minimizes voltage overshoot during <1 ns ESD events; critical for protecting high-speed data lines and microcontroller GPIOs |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing and end-of-life recycling |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground, clamping transients within 1 ns to prevent latch-up or gate oxide damage. Use Value: Maintains signal integrity below 53.9 V during 11.1 A surges, enabling compliance with ISO 7637-2 Pulse 1/2a/5a test profiles. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and electrostatic discharge during maintenance. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24 V DC input channels, absorbing energy before reaching optocoupler or MCU input pins. Use Value: Limits voltage to ≤53.9 V at 11.1 A, preventing false triggering and ensuring >100,000 surge cycles per IEC 61000-4-5 Class 3. |
| Power Supply Rail Clamp | Consumer Device USB Port Protection |
Use Scenario: Secondary overvoltage protection on 3.3 V/5 V DC-DC output rails in telecom power systems exposed to back-EMF from hot-swap connectors. IC Role / Device Role / Timing Role: Standby clamping device parallel to load, activated only during fault conditions exceeding 33.3 V. Use Value: Delivers 600 W pulse handling without thermal runaway, supporting continuous operation up to +150 °C ambient. |
Use Scenario: ESD suppression on USB 2.0 D+/D− lines in portable audio devices subjected to ±15 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. CJ ≈ 100 pF at 0 V) placed adjacent to connector, shunting ESD current to ground. Use Value: Clamps sub-100 ns ESD events to <53.9 V while adding <0.5 pF parasitic capacitance - preserving signal rise time and eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5B | Same SMB package, 33 V VWM, but lower PPPM = 400 W; no AEC-Q101 qualification | Not suitable for automotive under-hood use; limited to commercial-grade industrial or consumer applications | Select when cost sensitivity outweighs automotive qualification and 600 W surge headroom is unnecessary |
| SMCJ33A-QH | Higher-power SMC package (1500 W PPPM), same VWM/VBR range; AEC-Q101 qualified, but larger footprint (7.11 × 6.22 mm vs. 4.57 × 3.94 mm) | Requires PCB redesign; preferred where higher surge margin justifies board space penalty | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or requires extended lifetime under repeated transients |
Compared with SMAJ33A-E3/5B and SMCJ33A-QH, the SM6T39AHM3_B/I uniquely balances AEC-Q101 compliance, 600 W surge capacity, and compact SMB footprint - making it optimal for space-constrained automotive and industrial designs needing validated reliability without layout change.
Availability
SM6T39AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom power supply rail protection requiring stable component supply across multi-year production cycles.
Supply support for SM6T39AHM3_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, efficiency, and application-specific optimization.
The SM6T Series is engineered for high-energy transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping performance, AEC-Q101 validation, and halogen-free compliance in standard surface-mount packages.
FAQ
What is the exact breakdown voltage range for SM6T39AHM3_B/I?
The SM6T39AHM3_B/I has a guaranteed breakdown voltage (VBR) range of 37.1 V to 41.0 V at a test current (IT) of 1.0 mA, measured per JESD201 and confirmed in Vishay's official datasheet revision 09-Jan-2024. This range ensures consistent avalanche turn-on behavior across production lots and temperature extremes, directly supporting design margin calculations for protected circuits.
Is SM6T39AHM3_B/I qualified for automotive applications?
Yes, the SM6T39AHM3_B/I carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification per Vishay's ordering nomenclature. It has passed stress tests including temperature cycling, high-temperature reverse bias, and ESD, making it suitable for under-hood and chassis-mounted automotive electronics where long-term reliability is mandatory.
What is the maximum clamping voltage of SM6T39AHM3_B/I under surge conditions?
The SM6T39AHM3_B/I clamps to a maximum of 53.9 V when subjected to an 11.1 A peak pulse current with a 10/1000 μs waveform - a value verified in Vishay's electrical characteristics table and critical for ensuring downstream ICs remain within absolute maximum ratings during IEC 61000-4-5 surge events.
Does SM6T39AHM3_B/I have bidirectional capability?
No, SM6T39AHM3_B/I is a unidirectional TVS diode, as indicated by the absence of "CA" suffix and confirmed by its cathode band marking. Bidirectional variants (e.g., SM6T39CAHM3_B/I) exist in the same series but are distinct orderable parts with different electrical symmetry and marking codes.
What package type does SM6T39AHM3_B/I use, and what are its key mechanical features?
The SM6T39AHM3_B/I uses the SMB (DO-214AA) package: 4.57 mm × 3.94 mm outline, 2.20 mm height, matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and UL 94 V-0 molding compound. Its low-profile design supports automated placement and provides low thermal resistance (RθJL = 20 °C/W) for efficient heat dissipation in dense layouts.
SM6T39AHM3_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):
- 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/I FAQ
1.How can I place an order for SM6T39AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHM3_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 SM6T39AHM3_B/I reliable?
The price and inventory of SM6T39AHM3_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 SM6T39AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T39AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHM3_B/I?
SM6T39AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHM3_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 SM6T39AHM3_B/I?
For technical support, including SM6T39AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHM3_B/I requirements.
6.How does Aetrix verify that SM6T39AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T39AHM3_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 SM6T39AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T39AHM3_B/I?
All SM6T39AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHM3_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 SM6T39AHM3_B/I part is unused and in its original packaging.
Return procedure for SM6T39AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39AHM3_B/I Tags
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