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Vishay General Semiconductor - Diodes Division SM6T39A-M3/5B
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- Part No.:
- SM6T39A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39A-M3/5B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,614
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Product details
Overview
SM6T39A-M3/5B 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 at 11.1 A (10/1000 μs), 600 W peak pulse power, and 150 °C max junction temperature - deployed in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the SM6T39A-M3/5B datasheet, SM6T39A-M3/5B pinout, SM6T39A-M3/5B application, or SM6T39A-M3/5B equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, unidirectional polarity alignment with DC bias, SMB thermal derating above 25 °C, and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SM6T39A-M3/5B operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (37.1–41.0 V). Its low-inductance SMB package enables fast response to ESD and lightning-induced transients, with clamping action limiting downstream voltage to ≤53.9 V at 11.1 A (10/1000 μs waveform).
It is rated for 100 A non-repetitive forward surge current (IFSM, 10 ms half-sine), supports -65 °C to +150 °C operating range, and meets J-STD-020 MSL Level 1 (260 °C reflow peak), making it suitable for automated SMT assembly in harsh-environment electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - Maximum continuous reverse voltage before leakage exceeds 1 μA; sets safe operating margin below protected circuit's max rating. |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - Clamped voltage during worst-case surge; must be below downstream IC's absolute max input voltage. |
| PPPM | 600 W - Peak transient energy handling capability; defines survivability against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - Maximum junction temperature; determines thermal design headroom in enclosed or high-ambient environments. |
| Package | SMB (DO-214AA) - Standard surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with IPC-7351B land patterns. |
Pinout & Package
SMB (DO-214AA) package: molded plastic body with matte tin-plated leads, cathode indicated by band marking; terminals solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., GND or return path); defines unidirectional conduction direction. |
| Cathode | Avalanche clamping node | Banded end; connected to higher-potential line (e.g., 24 V rail or signal input); conducts when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 surges up to 4 kV (line-to-earth) without failure. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream components - critical for 3.3 V or 5 V logic interface protection. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for automotive and industrial OEMs without compromising electrical performance. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake-out steps in production. |
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 ISO 7637-2 pulses in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient spikes on supply and signal lines before they reach sensitive analog front-ends or communication ICs. Use Value: Prevents latch-up or permanent damage in automotive-grade microcontrollers and transceivers exposed to ±100 V/50 ms load-dump events. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges (e.g., relay coil flyback, motor switching noise). IC Role / Device Role / Timing Role: Fast-acting voltage clamp on 24 V DC input channels, absorbing >600 W transient energy within nanoseconds. Use Value: Eliminates false triggering and extends mean time between failures (MTBF) in factory automation equipment operating in electrically noisy environments. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters and USB PD chargers subjected to lightning-induced surges on DC output rails. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after secondary rectifier and before DC-DC controller ICs or battery management circuits. Use Value: Maintains 33.3 V working voltage margin while clamping to 53.9 V - sufficient to protect 40 V-rated MOSFETs and controllers without crowbar action. | Use Scenario: Primary protection on Ethernet PHY or RS-485 transceiver lines in telecom base station line cards exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: First-stage unidirectional clamp on biased data lines (e.g., +3.3 V terminated lines), shunting surge current to ground. Use Value: Achieves <1 ns response time and <54 V clamping - compliant with GR-1089-CORE Level 3 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same SMB package; 33 V VWM, 36.7–40.6 V VBR, 53.3 V VC @ 11.3 A - slightly tighter VBR tolerance but 400 W PPPM rating. | Limited to lower-energy transients (IEC 61000-4-5 Level 3); not rated for 100 A IFSM. | Select when cost sensitivity outweighs need for full 600 W surge margin and automotive-grade surge endurance. |
| P6SMB33A | Identical electrical specs and SMB package; same 33.3 V VWM, 37–41 V VBR, 53.9 V VC - but E3 (not M3) suffix: RoHS-compliant but not halogen-free. | No difference in circuit function or layout; differs only in material compliance (halogen content). | Choose when halogen-free requirement is not mandated, e.g., commercial or non-automotive industrial use. |
Compared with SMAJ33A and P6SMB33A, the SM6T39A-M3/5B delivers higher peak pulse power (600 W vs. 400 W), full 100 A surge current rating, and halogen-free construction - making it preferred for AEC-Q101-aligned designs and high-reliability industrial systems where long-term material compliance and surge margin are critical.
Availability
SM6T39A-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card surge protection requiring stable component supply, halogen-free compliance, and MSL Level 1 reflow compatibility.
Supply support for SM6T39A-M3/5B 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, power efficiency, and automotive qualification.
The SM6T Series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom applications where consistent clamping performance, low leakage, and robust surge endurance are mandatory.
FAQ
What is the polarity configuration of the SM6T39A-M3/5B?
The SM6T39A-M3/5B is a unidirectional transient voltage suppressor diode. Its cathode is marked by a band on the SMB package body, and it conducts only when the cathode is at a higher potential than the anode - making it suitable for DC-biased lines like 24 V supply rails or single-ended signal paths. This polarity prevents forward conduction during normal operation while enabling rapid avalanche clamping during negative-going transients relative to ground.
Does the SM6T39A-M3/5B meet AEC-Q101 qualification?
No, the SM6T39A-M3/5B is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free, RoHS-compliant commercial grade construction. For AEC-Q101 qualified versions, Vishay offers the SM6T39AHM3_B/I variant - which shares identical electrical specs but adds automotive qualification testing per JESD22-A108 and extended temperature cycling validation.
What is the maximum clamping voltage of the SM6T39A-M3/5B under a 10/1000 μs surge?
The SM6T39A-M3/5B has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 11.1 A. This value is guaranteed per the Vishay datasheet (Document Number: 88385, Rev. 09-Jan-2024) and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events - critical for ensuring compatibility with 40 V-rated components.
Can the SM6T39A-M3/5B be used in bidirectional applications?
No, the SM6T39A-M3/5B is strictly unidirectional. For bidirectional transient suppression - such as on AC-coupled or differential signal lines - Vishay specifies the CA-suffixed variant (e.g., SM6T39CA-M3/5B), which provides symmetrical clamping in both polarities. Using the unidirectional SM6T39A-M3/5B on bidirectional signals risks forward conduction and failure during positive half-cycles.
What is the thermal resistance of the SM6T39A-M3/5B from junction to ambient?
The SM6T39A-M3/5B 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. This value assumes standard PCB layout per Vishay's recommended pad dimensions and is essential for calculating steady-state junction temperature rise under continuous power dissipation - though the device is primarily intended for transient, not steady-state, power handling.
SM6T39A-M3/5B 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T39A-M3/5B FAQ
1.How can I place an order for SM6T39A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39A-M3/5B 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 SM6T39A-M3/5B reliable?
The price and inventory of SM6T39A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39A-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T39A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39A-M3/5B?
SM6T39A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39A-M3/5B 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 SM6T39A-M3/5B?
For technical support, including SM6T39A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39A-M3/5B requirements.
6.How does Aetrix verify that SM6T39A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T39A-M3/5B 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 SM6T39A-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T39A-M3/5B?
All SM6T39A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39A-M3/5B, 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 SM6T39A-M3/5B part is unused and in its original packaging.
Return procedure for SM6T39A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39A-M3/5B Tags
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