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Vishay General Semiconductor - Diodes Division SM6T39CAHM3/I
- Part No.:
- SM6T39CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,431
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Product details
Overview
SM6T39CAHM3/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 1.0 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/I datasheet, SM6T39CAHM3/I pinout, SM6T39CAHM3/I application, or SM6T39CAHM3/I equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.38), and SMB thermal resistance (RθJA = 100 °C/W).
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical VBR, VWM (33.3 V), and ID (1.0 μA) specifications in either direction. Its glass-passivated junction ensures stable breakdown and low leakage under repeated surge stress.
Designed for surface-mount automated assembly, it meets J-STD-020 MSL Level 1 (260 °C reflow peak) and JESD201 Class 2 whisker resistance. The SMB package provides low inductance and supports 100 A non-repetitive forward surge current (IFSM) only in unidirectional variants - not applicable to SM6T39CAHM3/I due to bidirectional construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines precise voltage threshold where clamping initiates in both directions |
| VWM | 33.3 V - maximum continuous reverse stand-off voltage before leakage exceeds 1.0 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) - industry-standard SMD outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
| AEC-Q101 | Qualified - validated for automotive-grade reliability per stress test requirements (HM3 suffix) |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; device functions identically regardless of orientation on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient current entry (positive half-cycle) | Accepts surge current during positive voltage excursion relative to other terminal |
| Cathode (Terminal 2) | Transient current entry (negative half-cycle) | Accepts surge current during negative voltage excursion relative to other terminal |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional suppression | Identical VBR, VC, and leakage performance in both polarities - eliminates need for orientation-aware layout |
| 600 W peak pulse rating | Robust protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surges without derating at TA ≤ 25 °C |
| AEC-Q101 qualified (HM3) | Validated for automotive electronics including engine control modules and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC JS709E - supports green manufacturing and end-of-life recycling |
| Low clamping ratio | VC/VBR ≈ 1.38 - minimizes overvoltage stress on downstream ICs during clamping event |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to shunt transients before reaching PHY layer. Use Value: Clamps 53.9 V surges at 11.1 A while maintaining 33.3 V stand-off - preserves signal integrity for 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Guarding differential CAN_H/CAN_L lines in factory automation gateways against ESD (±8 kV contact) and fast transient bursts. IC Role / Device Role / Timing Role: Symmetric suppression element across bus pair, leveraging bidirectional behavior to handle polarity-agnostic noise. Use Value: Matches CAN physical layer voltage margins (dominant recessive swing ±12 V) without false triggering or DC loading. |
| Consumer Power Adapter Input | Telecom DSL Line Protection |
Use Scenario: Secondary-side overvoltage protection on 12 V/24 V DC input rails of smart home hubs and PoE-powered devices. IC Role / Device Role / Timing Role: Standoff-clamp TVS parallel to bulk capacitor, activated only during surge events exceeding 33.3 V. Use Value: 600 W rating handles repetitive lightning-induced surges per IEC 61000-4-5 Level 3 (1 kV/2 Ω), extending adapter lifetime. | Use Scenario: Front-end protection of ADSL/VDSL line drivers against induced surges from nearby AC mains or telecom cable faults. IC Role / Device Role / Timing Role: Differential-mode suppressor bridging tip/ring lines, exploiting bidirectional symmetry for full-line coverage. Use Value: Low capacitance (<100 pF typical at 0 V) avoids signal attenuation above 1 MHz - maintains DSL data rates up to 100 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA | Lower PPPM (400 W), higher VC (58.1 V at 6.9 A), SMA package (larger RθJA = 140 °C/W) | Less robust for high-energy transients; suitable only for consumer-grade non-automotive use | Select when cost sensitivity outweighs automotive qualification and 600 W margin |
| 1.5KE39CA | Through-hole DO-201 package, same VBR/VC, but 1500 W rating and higher IFSM (not applicable to bidirectional) | Requires PCB through-hole real estate and wave soldering; incompatible with fully SMT production | Choose only for legacy designs or prototyping where manual assembly is acceptable |
Compared with SMAJ36CA and 1.5KE39CA, SM6T39CAHM3/I delivers AEC-Q101 qualification, halogen-free compliance, and optimized SMB thermal performance - making it the preferred choice for volume automotive and industrial SMT deployments requiring long-term supply stability and regulatory alignment.
Availability
SM6T39CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, consumer power adapters, and telecom DSL line cards requiring stable component supply across multi-year production cycles.
Supply support for SM6T39CAHM3/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 and application-specific optimization.
The SM6T Series targets high-volume board-level transient protection, with HM3 variants engineered specifically for automotive electronics meeting AEC-Q101 and halogen-free mandates.
FAQ
What does the "CA" suffix indicate in SM6T39CAHM3/I?
The "CA" suffix in SM6T39CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM6T39A), SM6T39CAHM3/I has no cathode marking and exhibits identical VBR, VWM, and VC characteristics in either polarity. This makes SM6T39CAHM3/I ideal for protecting AC-coupled or differential signal paths such as CAN bus lines.
Is SM6T39CAHM3/I qualified for automotive applications?
Yes, SM6T39CAHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix - indicating halogen-free, RoHS-compliant construction with full automotive reliability validation. It is rated for operating junction temperatures from −65 °C to +150 °C and meets MSL Level 1 moisture sensitivity. SM6T39CAHM3/I is approved for use in engine control units, body electronics, and ADAS sensor interfaces where sustained reliability under thermal and mechanical stress is required.
What is the clamping voltage of SM6T39CAHM3/I under standard test conditions?
The clamping voltage (VC) of SM6T39CAHM3/I is 53.9 V when subjected to a 10/1000 μs peak pulse current of 11.1 A, per the Vishay SM6T datasheet (Document Number 88385). This value represents the maximum voltage that will appear across the protected circuit during a standardized surge event. The low clamping ratio (VC/VBR ≈ 1.38) ensures minimal overvoltage stress on downstream components like microcontrollers or transceivers.
How does the SMB package of SM6T39CAHM3/I compare to SMA or SMC alternatives?
The SMB (DO-214AA) package of SM6T39CAHM3/I measures 4.06 mm × 5.59 mm with a height of 2.20 mm - smaller than SMA (DO-214AC) and significantly smaller than SMC (DO-214AB). Its compact size enables dense PCB layouts, while its RθJA of 100 °C/W offers better thermal performance than SMA (140 °C/W) under identical pad layout. SM6T39CAHM3/I's SMB footprint also supports automated pick-and-place with J-STD-020 MSL Level 1 compatibility - unlike larger through-hole alternatives.
Can SM6T39CAHM3/I be used in place of a unidirectional TVS like SM6T39AHM3/I?
No - SM6T39CAHM3/I is strictly bidirectional and cannot replace unidirectional variants like SM6T39AHM3/I in circuits requiring DC blocking or polarity-sensitive clamping. Unidirectional types have an anode/cathode designation and conduct forward current, whereas SM6T39CAHM3/I conducts equally in both directions above VBR. Substituting SM6T39CAHM3/I for SM6T39AHM3/I may cause unintended conduction in DC-biased lines. Always verify polarity requirements before selecting SM6T39CAHM3/I.
SM6T39CAHM3/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:
- -
- 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/I FAQ
1.How can I place an order for SM6T39CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHM3/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/I reliable?
The price and inventory of SM6T39CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SM6T39CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHM3/I?
SM6T39CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHM3/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/I?
For technical support, including SM6T39CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHM3/I requirements.
6.How does Aetrix verify that SM6T39CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SM6T39CAHM3/I?
All SM6T39CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHM3/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/I part is unused and in its original packaging.
Return procedure for SM6T39CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CAHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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