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Vishay General Semiconductor - Diodes Division SMA6J20A-M3/5A
- Part No.:
- SMA6J20A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J20A-M3/5A.pdf
- Description:
- TVS DIODE 20VWM 31.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J20A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 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-M3/5A datasheet, SMA6J20A-M3/5A pinout, SMA6J20A-M3/5A application, or SMA6J20A-M3/5A equivalent, key selection criteria include clamping performance under 10/1000 μs surge, thermal resistance (RθJA = 120 °C/W), unidirectional polarity, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream ICs or MOSFETs. Its low dynamic resistance (RD = 0.361 Ω) ensures tight clamping control, and its MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device is optimized for single-pulse transients - not repetitive surges - with derating above TA = 25 °C per Fig. 2. Its 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design (5.0 mm × 5.0 mm per terminal) to sustain 4 W power dissipation at TA = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC working margin. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Avalanche onset range; determines earliest clamping activation threshold. |
| VC at IPP | 31.4 V at 19.1 A (10/1000 μs) - Peak clamped voltage seen by protected circuit during standard surge event. |
| PPPM (10×1000 μs) | 600 W - Maximum single-pulse transient energy handling capability under standardized waveform. |
| ID at VWM | ≤ 0.2 μA - Reverse leakage current at rated stand-off voltage; ensures minimal standby power loss. |
| RθJA | 120 °C/W - Thermal resistance limiting power dissipation to 4 W at TA = 50 °C without forced cooling. |
| Polarity | Unidirectional - Protects against positive transients only; cathode marked by band; not suitable for AC line protection without external rectification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1, matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; enables forward-biased operation during fault conditions. |
| Cathode | Current exit point during reverse avalanche | Marked by color band; connected to higher-potential side; conducts surge current to ground or rail during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | VC = 31.4 V @ 19.1 A (10/1000 μs) - Limits voltage stress on 24 V-rated ICs or MOSFETs during load dump or inductive kick. |
| Thermal robustness | TJ max = +150 °C with RθJA = 120 °C/W - Supports operation in industrial ambient environments up to +85 °C with proper PCB layout. |
| Manufacturing compatibility | MSL Level 1, LF peak 260 °C - Enables use in standard lead-free reflow profiles without preconditioning. |
| Environmental compliance | M3 suffix - Halogen-free, RoHS-compliant, JESD201 Class 2 whisker resistant - meets IPC-1752A reporting and automotive supply chain requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 40 V, 100 ms) on 24 V vehicle power rails feeding ECUs or body control modules. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and chassis ground to clamp overvoltage before it reaches downstream regulators or microcontrollers. Use Value: Prevents latch-up or permanent damage to 24 V-rated power management ICs by limiting peak voltage to ≤31.4 V during standardized ISO 7637-2 Pulse 5a events. |
Use Scenario: Guards analog output lines (e.g., 4–20 mA current loop) of pressure or temperature sensors in factory automation systems exposed to ESD or relay switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed across sensor output and return path to absorb fast-rising transients (<1 ns rise time) induced by nearby motor contactors. Use Value: Maintains signal integrity below ±0.1% full-scale error by limiting clamping overshoot to <32 V while adding <1.5 pF capacitance at 0 V bias. |
| Telecom DC Power Input Protection | Consumer Device USB Port ESD Suppression |
Use Scenario: Safeguards primary DC input (24–48 V) of PoE-powered network switches against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage TVS on main power entry, upstream of DC/DC converters, sized to handle 600 W 10/1000 μs pulses per IEC 61000-4-5 Level 3. Use Value: Absorbs >95% of surge energy before it reaches isolation barriers, enabling compliance with EN 61000-4-5 without additional series impedance or filtering. |
Use Scenario: Protects USB 2.0 data lines (D+/D−) and VBUS in smart home hubs against human-body-model (HBM) ESD events up to ±15 kV. IC Role / Device Role / Timing Role: Discrete unidirectional TVS used on VBUS line only (not data lines), selected for low leakage (<0.2 μA) to avoid battery drain in always-on devices. Use Value: Provides fail-safe overvoltage shutdown at 31.4 V clamping level while maintaining <1 μA standby current - critical for battery-backed IoT gateways. |
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-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free; E3 suffix instead of M3. | Approved for commercial-grade applications where halogen-free requirement is not mandated (e.g., non-automotive consumer products). | Select SMA6J20A-E3/5A when cost sensitivity outweighs halogen-free compliance; identical footprint and thermal behavior. |
| SMBJ20A-M3 | Higher 600 W rating retained, but SMB (DO-214AA) package offers 20% larger pad area and lower RθJA (90 °C/W); same VWM/VBR/VC. | Better thermal performance allows sustained 4 W dissipation at higher ambient temperatures; preferred for high-reliability industrial designs with limited airflow. | Choose SMBJ20A-M3 when board space permits and thermal margin is critical; requires PCB layout change due to larger outline. |
Compared with SMA6J20A-E3/5A, the SMA6J20A-M3/5A adds halogen-free compliance without sacrificing clamping or surge capability; versus SMBJ20A-M3, it trades thermal margin for compact SMA footprint - making SMA6J20A-M3/5A optimal for space-constrained 24 V power rails where M3 compliance is required.
Availability
SMA6J20A-M3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply, long-term lifecycle support, and halogen-free material compliance.
Supply support for SMA6J20A-M3/5A 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, MOSFETs, and optoelectronics with emphasis on reliability, power efficiency, and industrial-grade qualification.
The SMA6JxxA family delivers standardized 600 W transient suppression in compact SMA packages for cost-sensitive, high-volume applications across automotive, industrial, and communications infrastructure - prioritizing ease of SMT integration and MSL-1 manufacturability.
FAQ
What is the maximum clamping voltage of the SMA6J20A-M3/5A under a 10/1000 μs surge?
The SMA6J20A-M3/5A 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 JEDEC standards and reflects the actual voltage seen by protected circuitry during standardized surge testing. The SMA6J20A-M3/5A maintains this clamping performance across its specified operating temperature range.
Does the SMA6J20A-M3/5A support bidirectional transient suppression?
No, the SMA6J20A-M3/5A is a unidirectional TVS diode and provides protection only against positive transients relative to ground. Its cathode band marks the terminal that must connect to the higher-potential side of the protected line. For bidirectional protection, two SMA6J20A-M3/5A devices in series opposition or a dedicated bidirectional part like SMBJ20CA-M3 would be required. The SMA6J20A-M3/5A datasheet explicitly states "Available in unidirectional polarity only."
What does the "M3" suffix indicate in SMA6J20A-M3/5A?
"M3" denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements, with matte tin-plated leads solderable per J-STD-002. It distinguishes the part from the E3 variant (RoHS-compliant but not halogen-free). The SMA6J20A-M3/5A is qualified for industrial-grade applications where material sustainability and long-term reliability under thermal cycling are mandatory.
Can the SMA6J20A-M3/5A be used in automotive applications?
Yes, the SMA6J20A-M3/5A is widely deployed in automotive 24 V systems for load-dump and ISO 7637-2 transient protection. Its –55 °C to +150 °C operating junction temperature range, MSL Level 1 reflow compatibility, and halogen-free M3 construction meet common Tier-1 supplier requirements. However, system-level validation per AEC-Q200 is required - the SMA6J20A-M3/5A itself is not AEC-Q200 qualified.
What PCB pad layout is recommended for optimal thermal performance of SMA6J20A-M3/5A?
Vishay specifies a minimum 5.0 mm × 5.0 mm copper pad for each terminal of the SMA6J20A-M3/5A to achieve rated 4 W power dissipation at TA = 50 °C. Smaller pads increase thermal resistance beyond the rated 120 °C/W, risking premature thermal runaway during repeated surges. The SMA6J20A-M3/5A datasheet Figure "Mounting Pad Layout" provides exact dimensions and clearance guidelines for reliable manufacturing yield.
SMA6J20A-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMA6J20A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J20A-M3/5A 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-M3/5A reliable?
The price and inventory of SMA6J20A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J20A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J20A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J20A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J20A-M3/5A?
SMA6J20A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J20A-M3/5A 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-M3/5A?
For technical support, including SMA6J20A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J20A-M3/5A requirements.
6.How does Aetrix verify that SMA6J20A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J20A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J20A-M3/5A?
All SMA6J20A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J20A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMA6J20A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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