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Vishay General Semiconductor - Diodes Division SM6T39AHE3_A/H
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- Part No.:
- SM6T39AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39AHE3_A/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,289
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Product details
Overview
SM6T39AHE3_A/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 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 AEC-Q101 qualified and used to protect automotive sensor signal lines against inductive switching surges.
For engineers reviewing the SM6T39AHE3_A/H datasheet, SM6T39AHE3_A/H pinout, SM6T39AHE3_A/H application, or SM6T39AHE3_A/H equivalent, key selection considerations include its unidirectional polarity, 150 °C max junction temperature, RoHS-compliant matte tin-plated leads, MSL Level 1 rating, and suitability for automotive-grade ESD and surge protection in space-constrained layouts.
Technical Context
The SM6T39AHE3_A/H operates as a unidirectional avalanche diode with glass-passivated junction, delivering precise voltage clamping during fast-rising transients. Its low-inductance SMB package and 20 °C/W junction-to-lead thermal resistance support reliable energy dissipation under repetitive surge conditions.
It meets AEC-Q101 qualification requirements for automotive use and is rated for -65 °C to +150 °C operating junction temperature. The device exhibits 1.0 μA maximum reverse leakage at 33.3 V and maintains stable clamping performance across temperature due to its αT of 10.0 × 10−4/°C temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - Clamped voltage seen by protected circuit during worst-case surge; limits downstream stress. |
| PPPM | 600 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 3/4 surges. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.220" x 0.205" footprint; compatible with automated pick-and-place and reflow. |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTOL, temperature cycling, and HAST per AEC standard. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected line's lower-potential side. | Provides low-forward-voltage path during fault conditions; referenced to system ground in typical clamp configuration. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to system ground or higher-potential rail. | Defines unidirectional conduction direction; determines clamping polarity relative to protected node. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables suppression of high-energy transients common in automotive load-dump and inductive switch-off events. |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal, mechanical, and electrical stress profiles. |
| Glass-passivated junction | Ensures stable VBR and low leakage over time and temperature; improves moisture resistance vs. epoxy-passivated devices. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage exposure to downstream ICs while maintaining margin above VWM. |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤53.9 V during 11.1 A surges, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. |
Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary surge suppression device mounted at connector entry point before optocoupler or Schmitt trigger input stage. Use Value: Withstands repeated 600 W pulses without degradation, extending maintenance intervals and reducing false-trip incidents. |
| Consumer Power Adapter Output | Telecom DC Power Feed Protection |
Use Scenario: Safeguarding USB-C PD and 12 V adapter outputs against accidental short-circuit transients and hot-plug spikes. IC Role / Device Role / Timing Role: Secondary-side clamping diode placed after DC-DC converter output filter capacitor. Use Value: Fast response (<1 ns) and low clamping voltage prevent overvoltage damage to connected devices during adapter fault conditions. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras, access points) from lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Line-to-ground TVS on each DC pair in midspan or endpoint PSE/PD interface. Use Value: 600 W rating handles IEC 61000-4-5 combination wave surges up to 2 kV/1 kA without failure. |
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, but lower PPPM (400 W); VWM = 33 V, VC = 53.3 V at 7.5 A. | Limited to lower-energy transients; not AEC-Q101 qualified. | Choose for cost-sensitive industrial designs where automotive qualification is unnecessary. |
| 1.5SMC33A | Higher-power SMC package (1500 W), same VWM/VC specs; larger footprint (0.315" x 0.260"). | Requires PCB area increase; better suited for primary-side AC/DC input protection. | Choose when surge energy exceeds 600 W or when design allows larger package for enhanced margin. |
Compared with SMAJ33A-E3/5B and 1.5SMC33A, the SM6T39AHE3_A/H delivers automotive-grade reliability in a compact SMB form factor with balanced clamping performance-ideal for space-constrained, high-reliability signal-line protection where 600 W surge handling and AEC-Q101 compliance are mandatory.
Availability
SM6T39AHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer power adapter outputs, and telecom DC feed protection requiring stable component supply and traceable sourcing.
Supply support for SM6T39AHE3_A/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 and application-specific optimization.
The SM6T Series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems demanding AEC-Q101 qualification and consistent clamping behavior.
FAQ
What is the polarity configuration of the SM6T39AHE3_A/H?
The SM6T39AHE3_A/H is a unidirectional TVS diode: the banded end denotes the cathode, and it conducts only when the anode is more negative than the cathode. This configuration provides asymmetric clamping ideal for DC power rails and single-ended signal lines where reverse conduction must be blocked.
Does the SM6T39AHE3_A/H meet automotive qualification standards?
Yes, the SM6T39AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation revision 09-Jan-2024 (Doc. #88385). It has passed stress tests including high-temperature operating life, temperature cycling, and humidity testing required for automotive under-hood and cabin applications.
What is the maximum clamping voltage of the SM6T39AHE3_A/H under standard test conditions?
The SM6T39AHE3_A/H 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), measured per Figure 1 and Table on page 2 of the official datasheet. This value defines the upper voltage limit imposed on protected circuits during surge events.
Can the SM6T39AHE3_A/H be used in bidirectional applications?
No - the SM6T39AHE3_A/H is strictly unidirectional. For bidirectional transient suppression, Vishay specifies part numbers with the "CA" suffix (e.g., SM6T39CA). Using the unidirectional SM6T39AHE3_A/H on AC or differential lines risks reverse breakdown and permanent damage.
What is the thermal resistance from junction to ambient for the SM6T39AHE3_A/H?
The SM6T39AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. Its lower junction-to-lead resistance (RθJL = 20 °C/W) indicates efficient heat transfer to PCB traces, supporting sustained power dissipation in thermally constrained layouts.
SM6T39AHE3_A/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:
- Obsolete
- 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 (SMBJ)
SM6T39AHE3_A/H FAQ
1.How can I place an order for SM6T39AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39AHE3_A/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 SM6T39AHE3_A/H reliable?
The price and inventory of SM6T39AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T39AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39AHE3_A/H?
SM6T39AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39AHE3_A/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 SM6T39AHE3_A/H?
For technical support, including SM6T39AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39AHE3_A/H requirements.
6.How does Aetrix verify that SM6T39AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T39AHE3_A/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 SM6T39AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T39AHE3_A/H?
All SM6T39AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39AHE3_A/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 SM6T39AHE3_A/H part is unused and in its original packaging.
Return procedure for SM6T39AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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