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Vishay General Semiconductor - Diodes Division SM6T39CA-M3/5B
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- Part No.:
- SM6T39CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CA-M3/5B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,961
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Product details
Overview
SM6T39CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 53.9 V maximum clamping voltage (VC) at 11.1 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect automotive sensor interfaces and industrial I/O circuits.
For engineers reviewing the SM6T39CA-M3/5B datasheet, SM6T39CA-M3/5B pinout, SM6T39CA-M3/5B application, or SM6T39CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, SMB footprint compatibility, AEC-Q101 qualification eligibility (via HM3 suffix), low clamping ratio (VC/VBR ≈ 1.38), and halogen-free RoHS compliance per M3 grading.
Technical Context
The SM6T39CA-M3/5B operates as a symmetrical avalanche diode with identical forward and reverse breakdown characteristics due to its bidirectional CA construction. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and repeatable clamping performance across -65 °C to +150 °C operating range.
Designed for transient suppression per IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT), it delivers 53.9 V clamping at 11.1 A (10/1000 μs), with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W - enabling reliable operation on standard 0.2" × 0.2" copper pads without heatsinking under typical surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - peak clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak pulse power handling capacity; validates robustness against lightning-induced surges and inductive switching spikes |
| IFSM | Not applicable - bidirectional device has no defined forward surge rating; only unidirectional variants specify 100 A IFSM |
| TJ max. | +150 °C - maximum junction temperature; supports under-hood automotive and high-ambient industrial deployments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 2.20 mm × 3.94 mm body; compatible with automated pick-and-place |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; terminals interchangeable - enables placement flexibility and eliminates orientation errors in layout |
| Lead 1 / Lead 2 | Current path for transient conduction | Both leads conduct equally in either direction during overvoltage events; requires symmetric PCB trace routing for balanced impedance |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Validates protection against severe transients like ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems |
| Clamping voltage ≤ 53.9 V at 11.1 A | Ensures downstream 3.3 V/5 V logic and analog ICs remain within absolute maximum ratings during surge events |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU ELV directive for sustainable electronics manufacturing |
| MSL Level 1 (260 °C reflow peak) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking preconditioning |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (e.g., ESD > 1 ns rise time), improving protection fidelity |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start surges in vehicle ECUs. IC Role / Device Role: Bidirectional clamping element placed at connector interface to shunt transient energy before reaching signal conditioning circuitry. Use Value: Maintains VC ≤ 53.9 V during 12 V system load dump (ISO 7637-2 Pulse 5a), preventing damage to 5 V tolerant transceivers and ADC front-ends. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to inductive kickback from solenoid valves and relay coils. IC Role / Device Role: Primary transient suppressor across 24 V DC input terminals, coordinated with series impedance for current limiting. Use Value: Clamps 600 W surges (10/1000 μs) to <54 V, ensuring microcontroller GPIOs and optocoupler inputs operate within safe voltage windows. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station equipment from lightning-induced surges on long cable runs. IC Role / Device Role: First-stage protector on differential data lines, paired with common-mode chokes and secondary TVS devices. Use Value: Symmetrical clamping preserves differential signal integrity while diverting >10 kV EFT bursts (IEC 61000-4-4) away from sensitive PHY circuitry. |
Use Scenario: Suppressing commutation spikes generated by brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role: Across-motor terminals to clamp back-EMF during PWM switching, reducing radiated emissions and MOSFET stress. Use Value: 600 W rating handles repetitive 100 ms motor stall surges; SMB footprint allows direct mounting near motor connectors for minimal loop inductance. |
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), higher VC (53.3 V @ 7.5 A), SMA package (smaller thermal mass) | Limited to lower-energy transients; less suitable for automotive load dump or industrial 24 V line protection | Select when space-constrained layouts prioritize footprint over surge margin; verify IPPM derating at elevated ambient temperatures |
| SMCJ33CA | Higher PPPM (1500 W), same VWM/VBR, larger SMC package (DO-214AB) | Better suited for primary-level protection in high-power systems where PCB area permits larger package | Choose for enhanced reliability in harsh environments (e.g., railway traction control); requires revised pad layout and thermal relief design |
Compared with SMAJ33CA and SMCJ33CA, the SM6T39CA-M3/5B offers optimal balance of 600 W surge capacity, SMB footprint compatibility, and halogen-free compliance - making it ideal for cost-sensitive, volume automotive and industrial designs requiring validated AEC-Q101 readiness via HM3 variants.
Availability
SM6T39CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, halogen-free compliance, and SMB footprint consistency.
Supply support for SM6T39CA-M3/5B 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, power efficiency, and automotive-grade qualification.
The SM6T Series targets board-level transient suppression in automotive, industrial, and telecom systems - engineered for high-surge resilience, low clamping voltage, and seamless integration into automated SMT assembly lines.
FAQ
What does the "CA" suffix indicate in SM6T39CA-M3/5B?
The "CA" suffix denotes a bidirectional configuration - meaning the SM6T39CA-M3/5B provides symmetrical clamping in both polarities, with identical breakdown and clamping behavior regardless of voltage polarity applied. This eliminates the need for polarity-aware placement and makes it suitable for AC-coupled or differential signal lines where voltage reversals occur, unlike unidirectional "A" variants that require cathode orientation.
Is SM6T39CA-M3/5B qualified to AEC-Q101?
The SM6T39CA-M3/5B itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101 qualified versions under the HM3 suffix (e.g., SM6T39CAHM3_B/I). The "M3" in SM6T39CA-M3/5B indicates halogen-free and RoHS-compliant commercial-grade construction. For automotive applications requiring qualification, the HM3 variant must be specified - it shares identical electrical specs but undergoes additional stress testing per AEC-Q101.
What is the maximum clamping voltage of SM6T39CA-M3/5B under standard test conditions?
The SM6T39CA-M3/5B has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 11.1 A. This value is measured per Figure 1 in the Vishay datasheet 88385 and represents the highest voltage the protected circuit will experience during that specific surge condition - critical for verifying compatibility with downstream IC absolute maximum ratings.
How does the SMB (DO-214AA) package of SM6T39CA-M3/5B compare to SMA or SMC packages?
The SMB package of SM6T39CA-M3/5B measures 3.94 mm × 2.20 mm - smaller than SMC (DO-214AB) but larger than SMA (DO-214AC), offering a thermal and surge-handling compromise. With RθJA = 100 °C/W and 600 W PPPM, it delivers higher surge capacity than SMAJ-class devices while maintaining compatibility with fine-pitch automated placement. Its 0.2" × 0.2" copper pad requirement ensures adequate heat dissipation without demanding large thermal reliefs.
Can SM6T39CA-M3/5B be used in place of a unidirectional TVS like SM6T39A-M3/5B?
No - SM6T39CA-M3/5B is not a drop-in replacement for SM6T39A-M3/5B due to fundamental polarity differences. The "CA" variant is bidirectional with no cathode marking and symmetrical conduction, whereas the "A" variant is unidirectional with a marked cathode and conducts only in reverse bias. Substituting one for the other risks improper clamping or forward conduction in DC-biased circuits; layout and schematic must match the selected polarity type.
SM6T39CA-M3/5B 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-M3/5B FAQ
1.How can I place an order for SM6T39CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CA-M3/5B 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-M3/5B reliable?
The price and inventory of SM6T39CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T39CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CA-M3/5B?
SM6T39CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CA-M3/5B 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-M3/5B?
For technical support, including SM6T39CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CA-M3/5B requirements.
6.How does Aetrix verify that SM6T39CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T39CA-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T39CA-M3/5B?
All SM6T39CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CA-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SM6T39CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CA-M3/5B Tags
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