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Vishay General Semiconductor - Diodes Division SM6T39AHM3/H
- Part No.:
- SM6T39AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHM3/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,144
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Product details
Overview
SM6T39AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR at 1 mA), 53.9 V max clamping voltage (VC) at 11.1 A peak pulse current, and 600 W peak pulse power (10/1000 μs). It is halogen-free, RoHS-compliant, and AEC-Q101 qualified-used to protect automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SM6T39AHM3/H datasheet, SM6T39AHM3/H pinout, SM6T39AHM3/H application, or SM6T39AHM3/H equivalent, key selection criteria include its 33.3 V reverse stand-off rating, 53.9 V clamping performance under 11.1 A surge, AEC-Q101 qualification status, SMB package thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T39AHM3/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (37.1–41.0 V), thereby shunting transient energy to ground. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and low inductance for fast response to ESD and switching surges.
It is rated for 100 A non-repetitive forward surge (IFSM, 10 ms half-sine) and 150 °C maximum junction temperature, with thermal resistance of 20 °C/W junction-to-lead-enabling reliable operation in automotive under-hood environments when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - Ensures predictable turn-on within tight tolerance for robust overvoltage protection |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - Limits downstream IC voltage stress during 600 W transient events |
| PPPM | 600 W - Withstands high-energy transients common in automotive load-dump and inductive switching |
| IFSM | 100 A - Supports single-event surge immunity without bond-wire fusing |
| TJ max | +150 °C - Enables use in under-hood automotive modules and industrial motor drives |
| RθJA | 100 °C/W - Requires minimum 5.0 mm × 5.0 mm copper pads per terminal for thermal derating compliance |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (cathode-biased during clamping) | Connected to protected line; conducts transient current toward ground when reverse-biased beyond VBR |
| Cathode | Reference terminal (marked with band) | Typically tied to system ground; establishes polarity-sensitive clamping direction for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Provides robust protection against ISO 7637-2 Pulse 1, 2a, and 5a transients in 12 V automotive systems |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114 |
| Glass passivated junction | Ensures stable VBR and low leakage (<1 μA) across temperature and lifetime |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >1 kV/ns) |
| MSL Level 1 (260 °C peak) | Enables standard reflow assembly without moisture sensitivity concerns |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start surges in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between signal line and chassis ground to limit transient voltage to safe levels. Use Value: Clamps to ≤53.9 V at 11.1 A, preventing damage to 3.3 V/5 V interface ICs while maintaining signal integrity during normal operation. | Use Scenario: Safeguarding digital input terminals of programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input optocoupler or Schmitt trigger inputs to absorb 600 W inductive spikes. Use Value: Withstands 100 A surge (10 ms) without degradation, ensuring long-term reliability in factory automation environments. |
| Consumer Power Adapter Protection | Telecom DC Power Input Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters subjected to lightning-induced surges on DC output rails. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +VOUT and GND to clamp transient excursions above 33.3 V. Use Value: Fast avalanche response (<1 ns) limits voltage overshoot to <54 V, protecting downstream DC-DC converters and USB-PD controllers. | Use Scenario: Primary transient suppression on -48 V telecom power feeds entering base station equipment. IC Role / Device Role / Timing Role: Reverse-polarity TVS installed between -48 V rail and ground to handle negative-going surges per GR-1089-CORE. Use Value: 150 °C junction rating supports operation in sealed outdoor cabinets; halogen-free construction meets IPC-1752A environmental compliance. |
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 and higher VC = 53.3 V at 7.5 A | Lacks AEC-Q101 qualification; suitable for commercial-grade power supplies but not automotive front-end protection | Select when cost sensitivity outweighs automotive qualification and 600 W surge margin is not required. |
| 1.5SMC33A | Same VWM/VBR range but in larger SMC (DO-214AB) package; PPPM = 1500 W, VC = 53.3 V at 28.2 A | Higher surge capability but 30% larger footprint; requires PCB redesign and increased thermal mass | Choose when legacy designs demand higher pulse power headroom and board space permits SMC mounting. |
Compared with SMAJ33A-E3/5B and 1.5SMC33A, SM6T39AHM3/H delivers AEC-Q101 qualification in the compact SMB footprint with balanced 600 W capability and 53.9 V clamping-making it optimal for space-constrained, automotive-qualified signal-line protection where qualification and form factor are decisive.
Availability
SM6T39AHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom DC power inputs requiring stable component supply with full traceability and lifecycle management.
Supply support for SM6T39AHM3/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, precision, and automotive qualification.
The SM6T Series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, low clamping voltage, and consistent surge handling are critical.
FAQ
What is the clamping voltage of SM6T39AHM3/H at its rated peak pulse current?
The SM6T39AHM3/H has a maximum clamping voltage (VC) of 53.9 V when subjected to its rated peak pulse current of 11.1 A using a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during transient events. The SM6T39AHM3/H maintains this clamping performance across its specified operating temperature range and is validated for AEC-Q101 compliance.
Is SM6T39AHM3/H qualified for automotive applications?
Yes, SM6T39AHM3/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024, Doc. #88385). It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD per JESD22 standards. The SM6T39AHM3/H is specifically intended for automotive subsystems such as body control modules, sensor interfaces, and infotainment power rails where qualification is mandatory.
What does the "HM3" suffix indicate in SM6T39AHM3/H?
The "HM3" suffix in SM6T39AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "H" indicates the packaging configuration (7" tape and reel), while "M3" specifies halogen-free, lead-free, and whisker-resistant matte tin plating meeting JESD201 Class 2. The SM6T39AHM3/H thus satisfies both environmental and automotive reliability requirements without compromising electrical performance.
Can SM6T39AHM3/H be used in bidirectional configurations?
No, SM6T39AHM3/H is a unidirectional TVS diode, as indicated by its "A" suffix and cathode band marking. Bidirectional variants in the SM6T series use the "CA" suffix (e.g., SM6T39CA). Using SM6T39AHM3/H in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit. For symmetric surge suppression, the SM6T39AHM3/H must be paired with a second device or replaced with a verified bidirectional part.
What is the thermal resistance and recommended PCB layout for SM6T39AHM3/H?
The SM6T39AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay document 88385. To maintain reliability under repeated surge conditions, designers must implement this minimum pad area and ensure adequate copper pour. The SM6T39AHM3/H also exhibits RθJL = 20 °C/W, supporting efficient heat transfer to PCB traces or internal planes.
SM6T39AHM3/H 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:
- Discontinued at Digi-Key
- 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:
- -
- 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/H FAQ
1.How can I place an order for SM6T39AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHM3/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/H reliable?
The price and inventory of SM6T39AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SM6T39AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHM3/H?
SM6T39AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHM3/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/H?
For technical support, including SM6T39AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHM3/H requirements.
6.How does Aetrix verify that SM6T39AHM3/H is sourced from the original manufacturer or authorized distributors?
All SM6T39AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SM6T39AHM3/H?
All SM6T39AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHM3/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/H part is unused and in its original packaging.
Return procedure for SM6T39AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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