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Vishay General Semiconductor - Diodes Division SMA6J20A-M3/61
- Part No.:
- SMA6J20A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J20A-M3/61.pdf
- Description:
- TVS DIODE 20VWM 31.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J20A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping transient overvoltages on power and signal lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR at IT = 1 mA), 31.4 V maximum clamping voltage at 19.1 A (10/1000 μs), 600 W peak pulse power rating, and operates from –55 °C to +150 °C junction temperature.
For engineers reviewing the SMA6J20A-M3/61 datasheet, SMA6J20A-M3/61 pinout, SMA6J20A-M3/61 application, or SMA6J20A-M3/61 equivalent, key selection criteria include clamping performance under 10/1000 μs surges, thermal resistance (RθJA = 120 °C/W), unidirectional polarity, halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream ICs or MOSFETs. Its low dynamic resistance (RD = 0.361 Ω) ensures tight clamping control, while the 120 °C/W junction-to-ambient thermal resistance defines PCB copper pad requirements for sustained 4 W power dissipation at TA = 50 °C.
The device is rated for 50 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports MSL Level 1 moisture sensitivity, and maintains stable VBR across temperature via a known voltage temperature coefficient (αT = 9.4 × 10⁻⁴ /°C). Polarity is marked by a cathode band; terminals are matte tin-plated for J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before significant leakage; sets protection threshold for 24 V nominal systems. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed avalanche onset range; determines minimum clamping margin relative to system rail. |
| VC @ IPP | 31.4 V at 19.1 A (10/1000 μs) - Measured clamping voltage during standardized surge; defines worst-case voltage seen by protected circuit. |
| PPPM (10×1000 μs) | 600 W - Peak transient energy handling capability; used to size for lightning or inductive-switching events per IEC 61000-4-5. |
| ID @ VWM | ≤ 0.2 μA - Ultra-low reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pads per terminal for rated PD = 4 W at TA = 50 °C. |
| Polarity | Unidirectional - Protects against positive transients only; requires correct orientation with cathode toward protected side of rail. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1, matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or lower-potential rail; completes clamping loop during overvoltage event. |
| Cathode | Protected circuit connection point | Connected to line being protected (e.g., 24 V supply rail); avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC = 31.4 V at 19.1 A (10/1000 μs) enables robust protection of 24 V industrial interfaces without over-clamping. |
| Thermal reliability | RθJA = 120 °C/W with defined pad layout supports 4 W continuous dissipation at 50 °C ambient-critical for enclosed enclosures. |
| Manufacturing readiness | MSL Level 1 rating and matte tin terminations ensure compatibility with lead-free reflow profiles up to 260 °C peak. |
| Environmental compliance | M3 suffix confirms halogen-free, RoHS-compliant, industrial-grade construction per Vishay's material categorization. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
|
Use Scenario: Protection of 24 V DC power rails feeding PLC I/O modules subjected to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Shunt clamping TVS placed directly across rail input to absorb repetitive 600 W transients. Use Value: Prevents latch-up or gate oxide damage in downstream MOSFET drivers and microcontrollers by limiting rail voltage to ≤31.4 V during 10/1000 μs surges. |
Use Scenario: Surge suppression on LIN bus power lines and window lift motor control inputs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional transient suppressor mounted at connector entry point to meet ISO 7637-2 Pulse 1/2a immunity requirements. Use Value: Maintains <0.2 μA leakage at 20 V to avoid battery drain in always-on domains while clamping 19.1 A surges to 31.4 V. |
| Telecom Power Supply Input | Industrial Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection for 24 V telecom rectifier modules exposed to lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Primary-level TVS on DC input bus, coordinated with upstream MOVs for staged clamping. Use Value: 600 W (10/1000 μs) rating provides validated energy absorption per IEC 61000-4-5 Level 4, enabling single-device compliance without parallel staging. |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loop receivers) in factory-floor pressure and temperature transmitters. IC Role / Device Role / Timing Role: Low-leakage unidirectional clamp on signal line power rail to prevent ESD-induced ADC offset shifts. Use Value: 0.2 μA max ID at VWM preserves signal integrity in high-impedance sensing paths; SMA package allows dense layout near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J20A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3 suffix). | Approved for general industrial use where halogen-free requirement is not mandated. | Select E3 for cost-sensitive designs meeting baseline RoHS; choose M3 when halogen-free compliance is contractually required. |
| SMBJ20A-M3 | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package: 2.54 mm lead pitch vs. SMA's 2.29 mm; RθJA = 80 °C/W (lower thermal resistance). | Better thermal performance allows higher sustained power; larger footprint may limit routing density. | Choose SMBJ20A-M3 when board space permits and thermal derating at elevated ambient is critical; retain SMA6J20A-M3 for compact layouts with verified 5 mm² pad cooling. |
Compared with SMA6J20A-E3/61, the M3 variant adds halogen-free assurance without electrical trade-offs; versus SMBJ20A-M3, SMA6J20A-M3 offers smaller footprint at the cost of higher thermal resistance-requiring strict adherence to 5.0 mm × 5.0 mm pad design for full 4 W rating.
Availability
SMA6J20A-M3/61 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and telecom power supply input applications requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMA6J20A-M3/61 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 industrial-grade qualification.
The SMA6JxxA series is part of Vishay's Transient Voltage Suppressor portfolio, engineered specifically for robust, surface-mount overvoltage protection in harsh environments including factory automation, transportation, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of SMA6J20A-M3/61 under a 10/1000 μs surge?
The SMA6J20A-M3/61 has a maximum clamping voltage (VC) of 31.4 V when subjected to a 10/1000 μs waveform at 19.1 A peak pulse current. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during such transients. The SMA6J20A-M3/61 achieves this with a dynamic resistance of 0.361 Ω, ensuring predictable voltage rise above VBR.
Does SMA6J20A-M3/61 support lead-free reflow soldering?
Yes, SMA6J20A-M3/61 meets J-STD-020 MSL Level 1 and is qualified for lead-free reflow with a maximum peak temperature of 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, and the M3 suffix confirms halogen-free, RoHS-compliant construction suitable for modern SMT assembly lines.
How does the thermal resistance of SMA6J20A-M3/61 affect PCB layout?
The SMA6J20A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, which requires mounting on PCB copper pads of at least 5.0 mm × 5.0 mm per terminal to achieve its rated 4 W power dissipation at TA = 50 °C. Reducing pad area increases junction temperature, risking premature thermal failure during repeated surges.
Is SMA6J20A-M3/61 unidirectional or bidirectional?
SMA6J20A-M3/61 is unidirectional, as confirmed in the Vishay datasheet under FEATURES and ELECTRICAL CHARACTERISTICS. It protects against positive transients only, with polarity indicated by a cathode band. Bidirectional operation is not supported; using it in reverse-biased configurations will not provide clamping.
What is the leakage current specification for SMA6J20A-M3/61 at its stand-off voltage?
At its 20 V stand-off voltage (VWM), the SMA6J20A-M3/61 exhibits a maximum reverse leakage current (ID) of 0.2 μA at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems and preserves accuracy in high-impedance sensor signal paths where even nanoamp-level currents could cause errors.
SMA6J20A-M3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 31.4V
- Current - Peak Pulse (10/1000µs):
- 19.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J20A-M3/61 FAQ
1.How can I place an order for SMA6J20A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J20A-M3/61 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 SMA6J20A-M3/61 reliable?
The price and inventory of SMA6J20A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J20A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J20A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J20A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J20A-M3/61?
SMA6J20A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J20A-M3/61 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 SMA6J20A-M3/61?
For technical support, including SMA6J20A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J20A-M3/61 requirements.
6.How does Aetrix verify that SMA6J20A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J20A-M3/61 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 SMA6J20A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J20A-M3/61?
All SMA6J20A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J20A-M3/61, 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 SMA6J20A-M3/61 part is unused and in its original packaging.
Return procedure for SMA6J20A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J20A-M3/61 Tags
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