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Vishay General Semiconductor - Diodes Division SM6T39CA-E3/5B
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- Part No.:
- SM6T39CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39CA-E3/5B.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:14,027
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Product details
Overview
SM6T39CA-E3/5B 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 SM6T39CA-E3/5B datasheet, SM6T39CA-E3/5B pinout, SM6T39CA-E3/5B application, or SM6T39CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3/HM3 variants), low clamping ratio (VC/VBR ≈ 1.38), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
The SM6T39CA-E3/5B operates as a bidirectional avalanche diode, exhibiting symmetrical clamping in both polarities with no cathode marking. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 33.3 V) 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 600 W peak pulse power with 10/1000 μs waveform while maintaining low thermal resistance (RθJA = 100 °C/W) on 5.0 mm × 5.0 mm copper pads - enabling robust protection without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - defines reliable conduction onset under bidirectional surge conditions |
| 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 seen by protected circuit during worst-case transient |
| PPPM | 600 W - peak transient energy absorption capacity without failure |
| IFSM | Not applicable - bidirectional device has no forward surge rating |
| TJ max. | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with IPC-7351B standard pad layout |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C reflow compatible. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals conduct identically during positive or negative surges - no orientation required during placement |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal path relies on soldered pad area (5.0 mm × 5.0 mm recommended) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity concerns |
| 600 W peak pulse power | Withstands high-energy transients from relay switching or motor commutation in industrial controls |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or ADC front-ends |
| MSL Level 1 rating | Supports lead-free reflow assembly without baking or special handling |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and leakage current over temperature and life cycle |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient spikes before they reach the sensor's ASIC or microcontroller ADC input. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor signal conditioning circuits during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from inductive kickback of solenoid valves. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed directly at connector entry point to divert surge energy to ground. Use Value: Maintains functional safety integrity by limiting transient voltage to ≤53.9 V, well below 60 V absolute maximum rating of input buffer ICs. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding RS-485 transceiver pins in base station backhaul modules subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level protection element placed before common-mode choke and secondary TVS stages. Use Value: Absorbs up to 600 W of coupled energy (IEC 61000-4-5, 2 Ω source) while preserving signal integrity via low capacitance (~100 pF). | Use Scenario: Suppressing commutation spikes on H-bridge gate drive lines in smart washing machine motor inverters. IC Role / Device Role / Timing Role: Localized clamping device mounted adjacent to MOSFET drivers to limit dv/dt-induced shoot-through risk. Use Value: Reduces gate oxide stress by clamping transients to 53.9 V, extending lifetime of 60 V-rated logic-level MOSFETs. |
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 | Lower PPPM (400 W), higher VC (58.1 V at 6.9 A), same SMB package | Limited to lower-energy transients; less margin for 36 V rail protection | Select when cost sensitivity outweighs need for 600 W headroom and tighter clamping |
| 1.5KE39CA | Higher PPPM (1500 W), DO-201 package (axial leaded), slower response due to higher inductance | Requires through-hole mounting; unsuitable for high-density SMT designs | Choose only for legacy through-hole systems where board real estate and assembly method permit |
Compared with SMAJ36CA and 1.5KE39CA, the SM6T39CA-E3/5B offers optimal balance of high pulse power, compact SMB footprint, and low clamping voltage - making it preferred for modern automotive and industrial SMT designs requiring AEC-Q101 readiness and automated assembly compatibility.
Availability
SM6T39CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, telecom line interfaces, and consumer appliance motor control systems requiring stable component supply and RoHS-compliant sourcing.
Supply support for SM6T39CA-E3/5B 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, TVS devices, and optoelectronics with emphasis on reliability, precision, and automotive-grade qualification.
The SM6T Series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high pulse power, low clamping, and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the breakdown voltage tolerance of the SM6T39CA-E3/5B?
The SM6T39CA-E3/5B has a specified breakdown voltage range of 37.1 V to 41.0 V at 1 mA test current, representing ±5.4% tolerance about the nominal 39 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports precise system-level surge margining in designs using 33 V or 36 V rails.
Is the SM6T39CA-E3/5B suitable for automotive applications?
Yes, the SM6T39CA-E3/5B is RoHS-compliant and manufactured to Vishay's commercial-grade specifications. While the base part itself is not AEC-Q101 qualified, its variant SM6T39CAHE3_B/I carries full AEC-Q101 qualification. Engineers selecting SM6T39CA-E3/5B for automotive use must verify qualification status per ordering code and consult Vishay's automotive-grade documentation for the HE3/HM3 suffix versions.
What does the "CA" suffix indicate in SM6T39CA-E3/5B?
The "CA" suffix in SM6T39CA-E3/5B explicitly denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants (e.g., SM6T39A), the CA version has no polarity marking and functions identically regardless of terminal orientation, simplifying layout and assembly for AC or differential signal paths.
How does the clamping voltage of SM6T39CA-E3/5B compare to its breakdown voltage?
The SM6T39CA-E3/5B clamps at 53.9 V when subjected to its rated peak pulse current of 11.1 A (10/1000 μs waveform), yielding a clamping ratio (VC/VBR) of approximately 1.38. This ratio reflects efficient avalanche conduction and is critical for ensuring protected ICs experience minimal overvoltage - especially important for 3.3 V or 5 V logic interfacing with 24–36 V supply domains.
What is the thermal resistance of SM6T39CA-E3/5B and how does it affect PCB layout?
The SM6T39CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repetitive transients, designers must adhere to this pad size recommendation - undersized pads increase thermal impedance and risk exceeding the +150 °C maximum junction temperature during sustained surge events.
SM6T39CA-E3/5B 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-E3/5B FAQ
1.How can I place an order for SM6T39CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39CA-E3/5B 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-E3/5B reliable?
The price and inventory of SM6T39CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T39CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39CA-E3/5B?
SM6T39CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39CA-E3/5B 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-E3/5B?
For technical support, including SM6T39CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39CA-E3/5B requirements.
6.How does Aetrix verify that SM6T39CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T39CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T39CA-E3/5B?
All SM6T39CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SM6T39CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39CA-E3/5B Tags
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