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Vishay General Semiconductor - Diodes Division SM6T39CAHM3_A/I
- Part No.:
- SM6T39CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHM3_A/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,867
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Product details
Overview
SM6T39CAHM3_A/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), and clamping voltage of 53.9 V at 11.1 A. 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_A/I datasheet, SM6T39CAHM3_A/I pinout, SM6T39CAHM3_A/I application, or SM6T39CAHM3_A/I equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.38), and SMB thermal resistance (RθJA = 100 °C/W).
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical avalanche conduction in both directions, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low leakage (<1 μA at 33.3 V).
Designed for surface-mount automated assembly on 5.0 mm × 5.0 mm copper pads, it delivers 600 W pulse handling per JEDEC-standard 10/1000 μs waveform while maintaining MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility.
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 - clamped voltage during 600 W transient, limiting downstream stress |
| PPPM | 600 W (10/1000 μs) - peak surge energy absorption capability under standardized lightning/surge test |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and high-ambient industrial enclosures |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, guiding PCB copper pad sizing for reliability |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002. Bidirectional construction means no cathode/anode marking; terminals are symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts avalanche current when voltage exceeds +VBR; electrically identical to Cathode in bidirectional mode |
| Cathode | Transient current entry (negative half-cycle) | Conducts avalanche current when voltage exceeds –VBR; electrically identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded power rails |
| 600 W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV surge) with margin when mounted per recommended 5.0 mm × 5.0 mm pads |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules, ADAS sensors, and body electronics |
| Low clamping ratio (VC/VBR) | 1.38 - minimizes overvoltage overshoot during fast transients, reducing risk to protected ICs |
| MSL Level 1 | Allows unlimited floor life and standard reflow without baking, simplifying SMT line integration |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting wheel speed sensor outputs exposed to load-dump and ISO 7637-2 pulses in chassis-mounted ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector interface to shunt transients before reaching signal conditioning amplifier. Use Value: Withstands 600 W surges while holding clamped voltage below 54 V, preserving amplifier input stage integrity per AEC-Q100 stress limits. | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs subject to ground-loop-induced surges and ESD. IC Role / Device Role / Timing Role: Differential-line TVS across A/B bus pins to suppress common-mode transients without distorting data eye. Use Value: Symmetrical 39 V breakdown ensures equal clamping on both polarities, maintaining signal integrity during ±15 kV contact ESD per IEC 61000-4-2. |
| Consumer Power Adapter Input | Telecom DSL Line Protection |
Use Scenario: Secondary-side DC output protection in wall adapters subjected to lightning-induced surges via connected devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on +VOUT rail to clamp overvoltage before reaching USB-PD controller or battery management IC. Use Value: 33.3 V stand-off allows normal 24 V nominal operation while triggering at 39 V to prevent damage from sustained overvoltage faults. | Use Scenario: Front-end protection of ADSL/VDSL line drivers against induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional TVS between tip/ring and ground to absorb longitudinal surges without disrupting low-frequency voice signals. Use Value: Low capacitance (<100 pF at 0 V) avoids signal attenuation above 1 MHz, preserving DSL sync stability and data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39CA-E3/5B | Same SMB package, 39 V bidirectional, but rated for 400 W PPPM (vs. 600 W); RθJA = 110 °C/W | Limited to lower-energy transients (IEC 61000-4-5 Level 3); not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and 600 W headroom. |
| 1.5KE39CA | Through-hole DO-201 package, 39 V bidirectional, 1500 W PPPM, but larger footprint and higher inductance | Suitable for prototyping or legacy through-hole designs; incompatible with automated SMT lines | Choose only if board redesign for SMT is impractical and surge energy exceeds 600 W. |
Compared with SMAJ39CA-E3/5B and 1.5KE39CA, SM6T39CAHM3_A/I uniquely combines 600 W surge rating, AEC-Q101 qualification, halogen-free compliance, and SMB footprint-making it optimal for volume automotive and industrial SMT production where reliability, regulatory alignment, and assembly efficiency are jointly critical.
Availability
SM6T39CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, consumer power adapter outputs, and telecom DSL line interfaces requiring stable component supply across multi-year production cycles.
Supply support for SM6T39CAHM3_A/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, precision, and application-specific optimization.
The SM6T Series is engineered for high-reliability transient suppression in space-constrained, high-volume applications-particularly automotive, industrial, and telecom systems where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T39CAHM3_A/I?
The "CA" suffix in SM6T39CAHM3_A/I denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. This differs from unidirectional variants (e.g., SM6T39A) that protect only one polarity and require correct cathode orientation. SM6T39CAHM3_A/I has no polarity marking and is used where AC signals, differential buses, or floating rails demand equal clamping in either direction.
Is SM6T39CAHM3_A/I suitable for automotive applications?
Yes, SM6T39CAHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to meet automotive reliability requirements for under-hood and cabin electronics such as ADAS sensors and body control modules.
What is the clamping voltage of SM6T39CAHM3_A/I at its rated peak pulse current?
The clamping voltage (VC) of SM6T39CAHM3_A/I is 53.9 V at 11.1 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value represents the maximum voltage seen across the device during a 600 W transient event and is critical for ensuring downstream components remain within their absolute maximum ratings.
How does the SMB (DO-214AA) package of SM6T39CAHM3_A/I compare thermally to larger packages?
SM6T39CAHM3_A/I in SMB package has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. While larger packages like DO-201 (e.g., 1.5KE series) offer lower RθJA, the SMB footprint enables high-density SMT layouts and automated assembly-making SM6T39CAHM3_A/I ideal where board space and manufacturing efficiency are prioritized over extreme thermal dissipation.
What does the "_A/I" suffix mean in SM6T39CAHM3_A/I?
The "_A/I" suffix in SM6T39CAHM3_A/I indicates the revision code and packaging format: "A" is the document revision level per Vishay's datasheet (88385, Rev. 09-Jan-2024), and "I" denotes 13-inch diameter plastic tape-and-reel delivery with 3200 units per reel. This ensures traceability, consistency in moisture-sensitive handling (MSL Level 1), and compatibility with high-speed pick-and-place equipment.
SM6T39CAHM3_A/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:
- Obsolete
- 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:
- -
- 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_A/I FAQ
1.How can I place an order for SM6T39CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHM3_A/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_A/I reliable?
The price and inventory of SM6T39CAHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SM6T39CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHM3_A/I?
SM6T39CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHM3_A/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_A/I?
For technical support, including SM6T39CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHM3_A/I requirements.
6.How does Aetrix verify that SM6T39CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SM6T39CAHM3_A/I?
All SM6T39CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SM6T39CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CAHM3_A/I Tags
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