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Vishay General Semiconductor - Diodes Division SM6T39CAHM3_B/I
- Part No.:
- SM6T39CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHM3_B/I.pdf
- Description:
- 600W,39V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,522
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Product details
Overview
SM6T39CAHM3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 39 V breakdown voltage (VBR = 37.1–41.0 V at 1 mA), 600 W peak pulse power (10/1000 μs), 53.9 V clamping voltage at 11.1 A, and −65 °C to +150 °C operating junction temperature. It protects signal lines and power rails in automotive sensor units and industrial control interfaces against ESD and inductive switching transients.
For engineers reviewing the SM6T39CAHM3_B/I datasheet, SM6T39CAHM3_B/I pinout, SM6T39CAHM3_B/I application, or SM6T39CAHM3_B/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance, SMB thermal resistance (RθJA = 100 °C/W), and verified 10/1000 μs waveform performance under JEDEC-standard mounting conditions.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical avalanche conduction in both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low leakage (<1 μA at 33.3 V).
Designed for surface-mount automation, the SM6T39CAHM3_B/I delivers low-inductance transient response and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 600 W PPPM rating is validated on 5.0 mm × 5.0 mm copper pads - not board-level heatsinking - making layout-aware thermal design essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines precise clamping onset threshold for bidirectional overvoltage events |
| VWM | 33.3 V - maximum continuous reverse stand-off voltage before leakage exceeds 1 μA |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - actual clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak transient power handling capability under standardized 10/1000 μs waveform |
| TJ range | −65 °C to +150 °C - enables operation in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - 3.94 mm × 2.20 mm body with 2.18 mm minimum cathode band width for automated optical inspection |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including HTOL, TC, and HAST testing |
| RoHS & Halogen-Free | Compliant per Vishay HM3 suffix - supports green manufacturing and end-of-life recycling requirements |
Pinout & Package
SMB (DO-214AA) surface-mount package with symmetrical dual-terminal construction: no polarity marking for bidirectional operation; terminals are matte tin-plated and solderable per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Conducts during negative surges; forms one half of symmetrical clamping path |
| Cathode | Transient current entry (positive polarity event) | Conducts during positive surges; forms complementary half of clamping path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded power rails without polarity concerns |
| 600 W peak pulse power | Withstands high-energy transients from relay coil flyback or load dump in 12 V automotive systems |
| AEC-Q101 qualification | Validates long-term reliability for engine control modules, ADAS sensors, and infotainment power supplies |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT line integration |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN/LIN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to ISO 7637-2 pulses and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt transients before reaching signal conditioning ICs. Use Value: Maintains signal integrity under ±30 kV contact ESD (IEC 61000-4-2) and 100 V/50 ms load dump (ISO 16750-2), preventing false readings or sensor failure. | Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation PLCs subjected to ground loop surges and motor drive noise. IC Role / Device Role / Timing Role: Common-mode transient suppressor across A/B bus lines, referenced to local ground with minimal added capacitance (CJ ≈ 100 pF at 0 V). Use Value: Limits common-mode voltage excursion to <54 V during 4 kV EFT bursts (IEC 61000-4-4), preserving data integrity and avoiding transceiver shutdown. |
| Consumer Power Adapter Input | Telecom DC Power Feed |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and wireless charging base stations where input rectifier output feeds buck controller. IC Role / Device Role / Timing Role: Fast-response clamp parallel to bulk capacitor, triggered within nanoseconds of transient arrival to protect MOSFET gate drivers and PWM controllers. Use Value: Clamps 600 W surges (e.g., capacitor discharge into short) to ≤54 V, preventing secondary-side MOSFET avalanche failure and maintaining regulation stability. | Use Scenario: DC power feed protection in PoE-powered access points and remote radio units receiving 48 V DC over Ethernet cables. IC Role / Device Role / Timing Role: Bidirectional clamp across DC input rails to absorb induced lightning surges (IEC 61000-4-5, 10/700 μs) and hot-swap transients. Use Value: Withstands 1.2/50 μs open-circuit voltage up to 1 kV while limiting clamped voltage to 53.9 V - ensuring downstream DC-DC converters remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39CA | Same VBR range (37.1–41.0 V), but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Not qualified to AEC-Q101; suitable only for commercial-grade consumer or telecom equipment | Select when space-constrained layouts prioritize footprint over automotive reliability or surge margin |
| SMCJ39CA | Higher PPPM = 1500 W; larger SMC package (7.11 mm × 6.22 mm); same VBR, VC, and AEC-Q101 qualification | Requires larger PCB area and higher thermal mass; better suited for high-energy industrial motor drives | Select when system-level surge tests exceed 600 W (e.g., IEC 61000-4-5 Level 4) and layout allows SMC footprint |
Compared with SMAJ39CA and SMCJ39CA, the SM6T39CAHM3_B/I offers optimal balance of AEC-Q101 compliance, 600 W surge capacity, and SMB footprint - making it the preferred choice for space-limited automotive ECUs and industrial edge nodes requiring validated reliability without over-engineering.
Availability
SM6T39CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, and telecom DC power feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T39CAHM3_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 high-reliability, high-efficiency, and automotive-qualified solutions.
The SM6T Series is designed specifically for robust transient suppression in harsh environments - targeting automotive powertrain and chassis systems, industrial automation I/O modules, and infrastructure power supplies where AEC-Q101 validation and repeatable clamping performance are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T39CAHM3_B/I?
The "CA" suffix in SM6T39CAHM3_B/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SM6T39A), this part has no cathode marking and conducts identically in either direction - essential for protecting AC-coupled or differential signal paths such as RS-485, CAN, or audio lines where polarity reversal may occur.
Is SM6T39CAHM3_B/I qualified for automotive use?
Yes, SM6T39CAHM3_B/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's official documentation. This qualification covers stress testing including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress test (HAST), validating its suitability for under-hood and cabin-mounted automotive electronics such as engine control units, ADAS camera modules, and body control modules.
What is the clamping voltage of SM6T39CAHM3_B/I at rated peak pulse current?
The clamping voltage of SM6T39CAHM3_B/I is 53.9 V at 11.1 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured with the device mounted on 5.0 mm × 5.0 mm copper pads per JEDEC guidelines and represents the maximum voltage imposed on the protected circuit during worst-case transient events - critical for ensuring downstream ICs remain within their absolute maximum voltage ratings.
How does the SMB package of SM6T39CAHM3_B/I compare thermally to larger packages like SMC?
The SMB package of SM6T39CAHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W under standard JEDEC mounting conditions, compared to ~50 °C/W for the larger SMC package. This means the SMB version requires careful PCB layout - including adequate copper pour and thermal vias - to manage power dissipation during repetitive surges, especially above 25 °C ambient. It is optimized for single-event protection rather than sustained power handling.
Does SM6T39CAHM3_B/I meet halogen-free and RoHS requirements?
Yes, SM6T39CAHM3_B/I meets both RoHS Directive 2011/65/EU and halogen-free requirements, as indicated by the "HM3" suffix in its ordering code. Vishay confirms this variant uses bromine- and chlorine-free molding compounds and matte tin-plated leads compliant with JESD 201 Class 2 whisker resistance - satisfying environmental compliance mandates for automotive and industrial OEMs in EU, China, and North America markets.
SM6T39CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T39CAHM3_B/I FAQ
1.How can I place an order for SM6T39CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHM3_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 SM6T39CAHM3_B/I reliable?
The price and inventory of SM6T39CAHM3_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 SM6T39CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T39CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHM3_B/I?
SM6T39CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHM3_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 SM6T39CAHM3_B/I?
For technical support, including SM6T39CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHM3_B/I requirements.
6.How does Aetrix verify that SM6T39CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHM3_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 SM6T39CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T39CAHM3_B/I?
All SM6T39CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHM3_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 SM6T39CAHM3_B/I part is unused and in its original packaging.
Return procedure for SM6T39CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CAHM3_B/I Tags
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