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Vishay General Semiconductor - Diodes Division SM6T39CA-M3/52
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- Part No.:
- SM6T39CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CA-M3/52.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,543
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Product details
Overview
SM6T39CA-M3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR), and 53.9 V maximum clamping voltage (VC) at 11.1 A peak pulse current - used to protect automotive sensor signal lines, industrial I/O ports, and power supply rails against ESD and inductive switching transients.
For engineers reviewing the SM6T39CA-M3/52 datasheet, SM6T39CA-M3/52 pinout, SM6T39CA-M3/52 application, or SM6T39CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, halogen-free RoHS-compliant construction (M3 suffix), AEC-Q101 qualification eligibility, low clamping ratio (VC/VBR ≈ 1.38), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
The SM6T39CA-M3/52 operates as a symmetric bidirectional TVS, exhibiting identical clamping behavior in both polarities due to its center-tapped avalanche structure. Its 10/1000 μs waveform rating reflects standardized surge immunity testing per IEC 61000-4-5, and it achieves thermal stability via low RθJA = 100 °C/W and RθJL = 20 °C/W.
Designed for surface-mount use in space-constrained PCBs, it leverages glass-passivated junction technology for robust surge endurance and meets J-STD-020 MSL Level 1 (260 °C reflow peak), enabling single-pass assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC/AC bias margin for protected circuitry |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - guaranteed avalanche onset range; ensures predictable turn-on during fast transients |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - peak clamped voltage seen by downstream ICs; limits stress on 3.3 V/5 V logic interfaces |
| PPPM | 600 W - peak surge power handling capacity; supports common automotive ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3/4 tests |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline (4.57 mm × 3.94 mm × 2.20 mm); compatible with IPC-7351B footprint and pick-and-place tooling |
Pinout & Package
SMB (DO-214AA) package: surface-mount, bidirectional device with no polarity marking; symmetrical terminals require no orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction node | Either terminal serves as anode or cathode depending on transient polarity; enables clamping of positive and negative surges without external circuit modification |
| Case (cathode band absent) | Non-functional mechanical reference | No electrical connection; absence of band confirms bidirectional configuration per Vishay marking convention |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports repeated surge events per IEC 61000-4-5 up to Level 4 (4 kV line-to-line) without degradation when mounted per recommended pad layout |
| Low clamping voltage (53.9 V @ 11.1 A) | Clamping ratio of 1.38 relative to VBR min ensures minimal overvoltage exposure to downstream 3.3 V/5 V microcontrollers and transceivers |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets JEDEC J-STD-20D and EU Directive 2011/65/EU requirements; eliminates brominated flame retardants for safer end-of-life processing |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow soldering without baking or special handling; reduces manufacturing cost and process complexity |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor inputs (e.g., pressure, temperature) in engine control units and ADAS modules from load dump and ESD. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, absorbing transients before they reach precision ADCs or communication PHYs. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (75 V/300 ms) events while limiting clamped voltage to ≤54 V - within absolute maximum ratings of 5 V tolerant automotive MCUs. | Use Scenario: Safeguarding digital input/output channels on programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS across each I/O terminal to shunt inductive kickback energy away from isolation barriers and FPGA GPIO banks. Use Value: Withstands 100 A IFSM surge capability (unidirectional variant basis) and 600 W pulse rating, enabling reliable protection without derating at ambient temperatures up to +85 °C. |
| Telecom Power Rail Protection | Consumer USB Port ESD Suppression |
Use Scenario: Clamping voltage spikes on 12 V/24 V telecom power distribution boards caused by hot-swap insertion or lightning-induced surges on connected lines. IC Role / Device Role / Timing Role: Primary front-end TVS on bulk power rail, coordinated with downstream ceramic capacitors and ferrite beads to form a low-impedance surge path to chassis ground. Use Value: Achieves <1 ns response time and low dynamic impedance (<0.5 Ω), limiting transient rise time impact and preventing latch-up in PMICs supplying baseband processors. | Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) and VBUS in portable media players and smart home hubs subjected to ±8 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional clamping element placed after common-mode choke but before USB transceiver, providing symmetric overvoltage suppression without signal distortion. Use Value: Junction capacitance <100 pF (typ.) at zero bias ensures minimal signal integrity impact on 480 Mbps high-speed data transmission while meeting Class 3B ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower PPPM = 400 W; same SMB package; VWM = 33 V, VC = 53.3 V @ 7.5 A | Reduced surge margin for ISO 7637-2 Pulse 5a; suitable for cost-sensitive consumer-grade designs with lower threat profiles | Select SMAJ33CA only if system-level testing confirms 400 W suffices and thermal derating at elevated ambient is acceptable |
| 1.5KE33CA | Higher PPPM = 1500 W; axial DO-201 package; VWM = 33 V, VC = 53.3 V @ 28.3 A | Requires through-hole mounting and larger board area; better suited for primary AC/DC input stage protection than dense SMT signal lines | Choose 1.5KE33CA for high-energy front-end protection where PCB real estate and assembly method permit axial components |
Compared with SMAJ33CA and 1.5KE33CA, SM6T39CA-M3/52 delivers optimal balance of 600 W surge capacity, SMB footprint, and halogen-free compliance - making it preferred for automotive and industrial SMT designs requiring AEC-Q101 readiness and automated manufacturability without sacrificing clamping performance.
Availability
SM6T39CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom power distribution systems requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SM6T39CA-M3/52 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, efficiency, and application-specific optimization.
The SM6T Series was developed specifically for robust, surface-mount transient suppression in automotive, industrial, and telecom systems - prioritizing low clamping voltage, repeatable surge endurance, and seamless integration into high-volume SMT production lines.
FAQ
What is the polarity configuration of SM6T39CA-M3/52?
SM6T39CA-M3/52 is a bidirectional TVS diode with symmetrical terminals and no cathode band marking. Its internal structure provides identical clamping characteristics for both positive and negative transients, eliminating the need for orientation during PCB placement - unlike unidirectional variants such as SM6T39A-M3/52 which feature a visible cathode band.
Does SM6T39CA-M3/52 meet AEC-Q101 qualification?
SM6T39CA-M3/52 itself is not AEC-Q101 qualified; however, the SM6T39CA-HM3 variant (with HM3 suffix) is explicitly qualified per AEC-Q101. The M3 suffix denotes halogen-free RoHS compliance only. For automotive applications requiring formal qualification, engineers must specify SM6T39CA-HM3_X (where _X is revision code) rather than SM6T39CA-M3/52.
What is the maximum clamping voltage of SM6T39CA-M3/52 under standard test conditions?
The maximum clamping voltage of SM6T39CA-M3/52 is 53.9 V when subjected to a 10/1000 μs waveform peak pulse current of 11.1 A, measured per Fig. 1 and Fig. 3 in Vishay document 88385. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SM6T39CA-M3/52 be used in place of unidirectional SM6T39A-M3/52?
No - SM6T39CA-M3/52 cannot directly replace SM6T39A-M3/52 in circuits relying on DC blocking or polarity-sensitive protection. While both share identical VWM, VBR, and VC values, the unidirectional version conducts only in reverse bias and blocks forward current, whereas the CA variant clamps equally in both directions. Substitution requires verification of signal polarity and circuit topology.
What PCB pad layout is recommended for optimal thermal and surge performance of SM6T39CA-M3/52?
Vishay specifies mounting SM6T39CA-M3/52 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W pulse power and thermal resistance (RθJA = 100 °C/W). Deviation from this layout - especially reduced copper area or lack of thermal vias - results in significant derating of both surge capability and steady-state power dissipation (PD = 5.0 W).
SM6T39CA-M3/52 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T39CA-M3/52 FAQ
1.How can I place an order for SM6T39CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CA-M3/52 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 SM6T39CA-M3/52 reliable?
The price and inventory of SM6T39CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SM6T39CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CA-M3/52?
SM6T39CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CA-M3/52 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 SM6T39CA-M3/52?
For technical support, including SM6T39CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CA-M3/52 requirements.
6.How does Aetrix verify that SM6T39CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T39CA-M3/52 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 SM6T39CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SM6T39CA-M3/52?
All SM6T39CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CA-M3/52, 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 SM6T39CA-M3/52 part is unused and in its original packaging.
Return procedure for SM6T39CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CA-M3/52 Tags
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