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Vishay General Semiconductor - Diodes Division SM6T39CAHM3_A/H
- Part No.:
- SM6T39CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CAHM3_A/H.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
SM6T39CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 39 V breakdown voltage (VBR = 37.1–41.0 V at 1 mA), 53.9 V maximum clamping voltage (VC) at 11.1 A peak pulse current, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive sensor protection.
For engineers reviewing the SM6T39CAHM3_A/H datasheet, SM6T39CAHM3_A/H pinout, SM6T39CAHM3_A/H application, or SM6T39CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (1.38), halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on PCBs requiring IEC 61000-4-2 Level 4 ESD immunity.
Technical Context
The SM6T39CAHM3_A/H operates as a silicon avalanche diode with symmetrical bidirectional conduction, enabling suppression of both positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1 μA at 33.3 V).
Thermal design relies on RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), supporting operation from –65 °C to +150 °C junction temperature. The device meets MSL Level 1 (260 °C reflow peak) and is qualified per AEC-Q101 for under-hood automotive use.
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 surges |
| 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 during 600 W transient event |
| PPPM | 600 W - peak pulse power handling capacity per standard 10/1000 μs waveform |
| TJ range | –65 °C to +150 °C - enables deployment in engine control units and industrial motor drives |
| Package | SMB (DO-214AA) - surface-mount footprint with 5.59 mm × 4.06 mm body and 2.20 mm height |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No cathode band; terminals interchangeable - enables single-component protection of AC-coupled or differential signal lines |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Handles high-energy load dump and inductive switching transients in 12 V automotive systems |
| Clamping ratio (VC/VBR) ≈ 1.38 | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or ADC front-ends |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets automotive OEM material compliance requirements and supports lead-free reflow assembly |
| Low inductance layout | Reduces voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing without dry pack or baking |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across signal line and ground to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs during 12 V system transients up to ±100 V. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protection element between field-side connector and optocoupler input stage. Use Value: Maintains functional safety integrity by clamping 4 kV EFT bursts to <54 V, preserving isolation barrier reliability. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links against lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Primary surge shunt connected differentially across A/B bus lines with common-mode choke. Use Value: Enables compliance with ITU-T K.21 Basic Protection Level (4 kV/2 Ω) without derating or parallel staging. |
Use Scenario: Adding secondary-level ESD robustness to USB 2.0 data lines (D+/D−) in portable media players. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed after series impedance to avoid signal integrity degradation. Use Value: Passes IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) while maintaining <1.5 pF junction capacitance at zero bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA | 36 V VBR, 58.1 V VC @ 10.3 A, same SMB package but lower clamping voltage and no AEC-Q101 qualification | Targeted at commercial-grade industrial controls where automotive qualification is not required | Select when cost sensitivity outweighs AEC-Q101 requirement and 36 V standoff suffices |
| 1.5KE39CA | DO-201 package (axial lead), 39 V VBR, 60.7 V VC @ 9.9 A, higher VC, not SMT-compatible | Used in through-hole prototyping or legacy board upgrades where rework flexibility is prioritized over density | Choose only if SMB footprint is unavailable and manual assembly is acceptable |
Compared with SMAJ36CA and 1.5KE39CA, SM6T39CAHM3_A/H delivers tighter VBR tolerance (±5% vs ±10%), lower clamping voltage (53.9 V vs 58.1/60.7 V), and guaranteed AEC-Q101 compliance - making it the preferred choice for production automotive electronics where reliability and SMT scalability are mandatory.
Availability
SM6T39CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer USB port protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SM6T39CAHM3_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 high-reliability and automotive-grade performance.
The SM6T Series was engineered specifically for robust transient suppression in space-constrained SMT applications, balancing high pulse power, low clamping, and AEC-Q101 compliance for modern vehicle electronics.
FAQ
What is the breakdown voltage range of the SM6T39CAHM3_A/H?
The SM6T39CAHM3_A/H has a specified breakdown voltage (VBR) range of 37.1 V to 41.0 V at 1 mA test current, measured per JEDEC standards. This tight ±5% tolerance ensures consistent clamping behavior across production lots and supports reliable design margining in 36 V nominal systems. The value is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Doc. #88385).
Is SM6T39CAHM3_A/H suitable for automotive applications?
Yes, SM6T39CAHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability validation. It is explicitly intended for under-hood and chassis-mounted electronics such as engine control sensors, body control modules, and ADAS camera interfaces where sustained operation at 150 °C junction temperature is required.
What does the "CA" suffix indicate in SM6T39CAHM3_A/H?
The "CA" suffix in SM6T39CAHM3_A/H denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive- and negative-going voltage spikes. Unlike unidirectional variants (e.g., SM6T39A), it has no cathode marking and functions identically regardless of terminal orientation - essential for protecting AC-coupled or differential signal paths.
What is the maximum clamping voltage of SM6T39CAHM3_A/H during a 600 W transient?
The SM6T39CAHM3_A/H clamps to a maximum of 53.9 V when subjected to its rated 600 W peak pulse (10/1000 μs waveform) at 11.1 A. This value is measured under standardized test conditions with 0.2" × 0.2" copper pads and represents the worst-case voltage seen by protected circuitry - critical for verifying compliance with IC absolute maximum ratings.
Does SM6T39CAHM3_A/H require special PCB layout considerations?
Yes, optimal performance of SM6T39CAHM3_A/H requires short, wide traces to minimize parasitic inductance - especially between the device and protected node/ground. Vishay recommends minimum 5.0 mm × 5.0 mm copper pads per terminal and avoidance of vias in the current path. These practices reduce overshoot during sub-100 ns transients and ensure the rated 53.9 V clamping is achieved in-system.
SM6T39CAHM3_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:
- -
- 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/H FAQ
1.How can I place an order for SM6T39CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CAHM3_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 SM6T39CAHM3_A/H reliable?
The price and inventory of SM6T39CAHM3_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 SM6T39CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T39CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CAHM3_A/H?
SM6T39CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CAHM3_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 SM6T39CAHM3_A/H?
For technical support, including SM6T39CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CAHM3_A/H requirements.
6.How does Aetrix verify that SM6T39CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T39CAHM3_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 SM6T39CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T39CAHM3_A/H?
All SM6T39CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CAHM3_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 SM6T39CAHM3_A/H part is unused and in its original packaging.
Return procedure for SM6T39CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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