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Vishay General Semiconductor - Diodes Division SM6T39AHM3/I
- Part No.:
- SM6T39AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,772
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Product details
Overview
SM6T39AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMB (DO-214AA) package, with 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1.0 mA, and 53.9 V clamping voltage (VC) at 11.1 A peak pulse current (IPPM) under 10/1000 μs waveform. It delivers 600 W peak pulse power and is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive-grade surge protection.
For engineers reviewing the SM6T39AHM3/I datasheet, SM6T39AHM3/I pinout, SM6T39AHM3/I application, or SM6T39AHM3/I equivalent, key selection criteria include its unidirectional polarity, cathode-band-marked SMB package, 150 °C max junction temperature, low-inductance design, and suitability for protecting MOSFETs, sensor signal lines, and IC power rails against inductive switching transients.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (33.3 V) and rapidly transitions to low-impedance conduction above VBR (min 37.1 V) to limit transient overvoltages. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The device uses a single P-N junction structure optimized for fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.45), and thermal stability up to 150 °C. It is rated for 100 A non-repetitive forward surge current (IFSM) and exhibits 100 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC bias margin. |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - Confirmed breakdown threshold range; ensures predictable turn-on across production lot. |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - Clamped voltage during worst-case surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 2.20 mm height and 5.59 mm body length; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over time and temperature; eliminates parameter drift due to moisture or contamination. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power rails. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental standards and global regulatory requirements for hazardous substance restriction. |
| Low-inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulses); improves clamping fidelity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤53.9 V, preventing damage to downstream LDOs, microcontrollers, and CAN transceivers. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on 4–20 mA or 0–10 V signal paths. Use Value: Maintains signal integrity by suppressing ESD (IEC 61000-4-2) and inductive kickback without loading the source impedance. |
| Consumer Device USB Port Protection | Telecom Power Supply Input Protection |
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations against hot-plug surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on input side of USB power switch ICs. Use Value: Withstands 600 W surges while maintaining 33.3 V hold-off-prevents false triggering during normal 5 V operation. | Use Scenario: Front-end protection for AC/DC adapters and PoE injectors exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on DC input bus prior to bulk capacitor and controller IC. Use Value: Delivers 11.1 A IPPM capacity with 53.9 V VC, enabling compliance with IEC 61000-4-5 (1.2/50 μs + 8/20 μs combo wave). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient 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 @ 7.5 A); not AEC-Q101 qualified. | Commercial-grade only; unsuitable for automotive under-hood use where AEC-Q101 and 600 W rating are mandatory. | Select when cost sensitivity outweighs automotive qualification and surge margin requirements. |
| SMCJ33A-HM3 | Higher-power SMC package (1500 W PPPM), same VWM (33 V), but larger footprint (7.11 mm × 6.22 mm) and different thermal profile. | Used where higher energy absorption is needed (e.g., industrial motor drives), but requires PCB layout change. | Choose when system-level surge testing exceeds 600 W and board space allows SMC footprint. |
Compared with SMAJ33A-E3/5B and SMCJ33A-HM3, the SM6T39AHM3/I uniquely balances AEC-Q101 qualification, 600 W surge capability, and compact SMB footprint-making it optimal for space-constrained automotive modules requiring validated reliability.
Availability
SM6T39AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB power management, and telecom power supply input protection requiring stable component supply and full traceability.
Supply support for SM6T39AHM3/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 designed specifically for robust, surface-mount transient voltage suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where consistent clamping performance and AEC-Q101 validation are critical.
FAQ
What is the clamping voltage of SM6T39AHM3/I under a 10/1000 μs surge?
The SM6T39AHM3/I has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at 11.1 A peak pulse current (IPPM). This value is measured per Figure 1 in the Vishay datasheet 88385 and reflects the actual voltage seen by protected circuitry during standardized surge events.
Is SM6T39AHM3/I suitable for automotive applications?
Yes, SM6T39AHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability testing. It is explicitly intended for use in engine control units, ADAS sensors, and other automotive subsystems requiring validated surge immunity.
What does the "HM3" suffix mean in SM6T39AHM3/I?
The "HM3" suffix in SM6T39AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates automotive qualification, "M" signifies halogen-free molding compound, and "3" refers to the standard SMB (DO-214AA) package variant per Vishay's ordering nomenclature.
How does SM6T39AHM3/I differ from SM6T39A-E3/52?
SM6T39AHM3/I shares identical electrical specs (VWM = 33.3 V, VBR = 37.1–41.0 V, VC = 53.9 V) with SM6T39A-E3/52 but adds AEC-Q101 qualification and halogen-free materials. The "HM3" version is automotive-grade; "E3" is commercial-grade with standard RoHS compliance only.
What is the thermal resistance of SM6T39AHM3/I?
The SM6T39AHM3/I 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. Its junction-to-lead resistance (RθJL) is 20 °C/W, supporting effective heat dissipation in compact layouts.
SM6T39AHM3/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:
- 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/I FAQ
1.How can I place an order for SM6T39AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHM3/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/I reliable?
The price and inventory of SM6T39AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SM6T39AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHM3/I?
SM6T39AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHM3/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/I?
For technical support, including SM6T39AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHM3/I requirements.
6.How does Aetrix verify that SM6T39AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T39AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SM6T39AHM3/I?
All SM6T39AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHM3/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/I part is unused and in its original packaging.
Return procedure for SM6T39AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39AHM3/I Tags
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