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Vishay General Semiconductor - Diodes Division SMA6F20A-M3/6B
- Part No.:
- SMA6F20A-M3/6B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F20A-M3/6B.pdf
- Description:
- TVS DIODE 20VWM 36.8VC DO221AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,603
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Product details
Overview
SMA6F20A-M3/6B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SlimSMA (DO-221AC) 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 1 mA, 31.4 V maximum clamping voltage (VC) at 19.1 A (10/1000 μs), 600 W peak pulse power, and IEC 61000-4-2 Level 4 ESD protection (15 kV air / 8 kV contact).
For engineers reviewing the SMA6F20A-M3/6B datasheet, SMA6F20A-M3/6B pinout, SMA6F20A-M3/6B application, or SMA6F20A-M3/6B equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal derating curves, and direct alternative options for circuit-level transient protection design.
Technical Context
The SMA6F20A-M3/6B operates as a Zener-based unidirectional TVS diode, triggering into low-impedance conduction when reverse voltage exceeds its VBR range (22.2–24.5 V). Its dynamic resistance (RD) is 0.361 Ω, enabling precise clamping with minimal voltage overshoot during fast transients.
It is rated for 600 W peak pulse power (10/1000 μs) and 4 kW (8/20 μs), with thermal resistance junction-to-ambient of 120–150 °C/W on FR4 PCB. The device supports operation from –55 °C to +175 °C junction temperature and meets MSL level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold for reliable turn-on margin |
| VC @ IPP | 31.4 V at 19.1 A (10/1000 μs) - Clamped voltage seen by protected circuit during standard surge |
| PPPM (10/1000 μs) | 600 W - Sustained transient energy absorption capability without failure |
| ID @ VWM | 0.2 μA max - Negligible leakage current ensuring minimal standby power loss |
| TJ max. | +175 °C - Enables use in high-temperature industrial and automotive under-hood environments |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - Validated system-level electrostatic immunity |
Pinout & Package
Package: SlimSMA (DO-221AC), ultra-low profile (0.95 mm typical height), halogen-free, RoHS-compliant, matte tin-plated leads, MSL Level 1, JESD201 Class 2 whisker tested. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional protection configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 20 V rail or signal input); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SlimSMA package | 0.95 mm height enables placement in space-constrained consumer and portable electronics |
| High-energy clamping | 600 W (10/1000 μs) and 4 kW (8/20 μs) ratings support robust protection against lightning-induced surges and inductive switching spikes |
| Precision VBR tolerance | ±5.5% (22.2–24.5 V) ensures predictable turn-on timing across production lots |
| Low dynamic impedance | 0.361 Ω minimizes clamping voltage rise under high di/dt transients, improving protection margin |
| Automated placement compatibility | Standard SlimSMA footprint and matte tin terminations ensure reliable solderability per J-STD-002/JESD22-B102 |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback in 24 V relay and solenoid circuits. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MOSFET gate and source to clamp negative-going transients during turn-off. Use Value: Limits voltage excursion to ≤31.4 V, preventing gate oxide damage and ensuring long-term reliability of 30 V-rated logic-level MOSFETs. | Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-rated TVS connected from LIN data line to chassis ground, absorbing 8/20 μs transients up to 4 kW. Use Value: Maintains signal integrity below 31.4 V clamping level while surviving repeated 100 V/50 ms load dump pulses per ISO 7637-2. |
| Consumer Power Adapters | Telecom Interface Ports |
Use Scenario: Input-stage overvoltage protection on 19–24 V DC input rails of USB-C PD adapters and wall chargers. IC Role / Device Role / Timing Role: Primary clamping device placed after input fuse and before primary-side controller IC. Use Value: Absorbs 600 W surges without degradation, preserving downstream controller operation and meeting UL 62368-1 transient immunity requirements. | Use Scenario: Secondary-side protection of Ethernet PHY power supplies and RS-485 transceiver VCC pins in base station equipment. IC Role / Device Role / Timing Role: Unidirectional TVS on 3.3 V or 5 V bias rails feeding communication ICs susceptible to EFT and surge coupling. Use Value: Provides 8 kV contact ESD immunity per IEC 61000-4-2, eliminating latch-up and reset events during field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F20A-M3/H | Same electrical specs; differs only in tape-and-reel packaging (7″ reel, 3500 pcs vs. 13″ reel, 14000 pcs) | No functional difference; identical performance and footprint | Select based on production volume and SMT line feeder compatibility |
| SMCJ20A | Higher power rating (1500 W, 10/1000 μs), larger SMC (DO-214AB) package, 34.4 V VC @ 43.3 A | Better suited for higher-energy transients but requires larger PCB area and higher mounting thermal mass | Choose SMA6F20A-M3/6B for space-constrained designs where 600 W suffices; select SMCJ20A only when >1 kW surge handling is required |
Compared with SMA6F20A-M3/H, the SMA6F20A-M3/6B offers identical electrical performance in a higher-volume tape format; compared with SMCJ20A, it trades off peak power capacity for 55% smaller footprint and lower profile-critical for ultra-thin end products.
Availability
SMA6F20A-M3/6B is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, consumer power adapters, and telecom interface ports requiring stable component supply and consistent surge immunity performance.
Supply support for SMA6F20A-M3/6B 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, precision, and high-volume manufacturability.
The SMA6FxxA series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for compact, high-efficiency transient suppression in space- and cost-sensitive DC power and signal line applications.
FAQ
What is the clamping voltage of the SMA6F20A-M3/6B under a 10/1000 μs surge?
The SMA6F20A-M3/6B has a maximum clamping voltage (VC) of 31.4 V at 19.1 A under a 10/1000 μs waveform. This value is measured per standard test conditions and represents the peak voltage imposed on the protected circuit during that transient event. The SMA6F20A-M3/6B maintains this clamping performance across its specified operating temperature range and is validated per JEDEC test methods.
Is the SMA6F20A-M3/6B suitable for automotive applications?
Yes, the SMA6F20A-M3/6B is suitable for automotive body electronics applications including LIN bus protection and sensor supply rail clamping. It operates from –55 °C to +175 °C junction temperature, meets IEC 61000-4-2 Level 4 ESD, and withstands repetitive surge stress per ISO 7637-2 indirect injection profiles. The SMA6F20A-M3/6B is not AEC-Q200 qualified but is widely deployed in non-safety-critical automotive subsystems.
How does the SlimSMA (DO-221AC) package of the SMA6F20A-M3/6B compare to SMA (DO-214AC)?
The SlimSMA (DO-221AC) package of the SMA6F20A-M3/6B is 30% lower in height (0.95 mm vs. ~1.35 mm) and has tighter dimensional tolerances than standard SMA (DO-214AC), enabling improved automated placement yield and reduced board clearance requirements. Both share the same anode/cathode pinout orientation, but the SMA6F20A-M3/6B's SlimSMA variant is optimized for ultra-thin consumer and portable electronics where vertical space is constrained.
Does the SMA6F20A-M3/6B have bidirectional capability?
No, the SMA6F20A-M3/6B is a unidirectional TVS diode only. It provides clamping protection against positive transients on the cathode side relative to anode (reverse-biased operation) and conducts forward like a standard diode below ~0.7 V. For bidirectional protection, a separate device such as SMA6F20CA or dual-diode array would be required. The SMA6F20A-M3/6B datasheet explicitly states "Unidirectional only" in its FEATURES section.
What is the thermal resistance of the SMA6F20A-M3/6B on a standard FR4 PCB?
The SMA6F20A-M3/6B has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and the recommended pad layout. This value increases to 150 °C/W maximum under worst-case board layout conditions. Derating curves in the datasheet confirm 100% power capability only up to 55 °C ambient; above that, linear derating applies per Figure 5. The SMA6F20A-M3/6B must be thermally modeled in context of actual PCB copper area and airflow.
SMA6F20A-M3/6B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-221AC, SMA Flat Leads
- 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:
- 36.8V
- Current - Peak Pulse (10/1000µs):
- 93A (8/20µs)
- Power - Peak Pulse:
- 4000W (4kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-221AC (SlimSMA)
SMA6F20A-M3/6B FAQ
1.How can I place an order for SMA6F20A-M3/6B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F20A-M3/6B 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 SMA6F20A-M3/6B reliable?
The price and inventory of SMA6F20A-M3/6B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F20A-M3/6B is usually 5 days.
3.What payment methods are accepted for SMA6F20A-M3/6B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F20A-M3/6B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F20A-M3/6B?
SMA6F20A-M3/6B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F20A-M3/6B 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 SMA6F20A-M3/6B?
For technical support, including SMA6F20A-M3/6B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F20A-M3/6B requirements.
6.How does Aetrix verify that SMA6F20A-M3/6B is sourced from the original manufacturer or authorized distributors?
All SMA6F20A-M3/6B 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 SMA6F20A-M3/6B meets industry standards.
7.What is the process for return or replacement of SMA6F20A-M3/6B?
All SMA6F20A-M3/6B units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F20A-M3/6B, 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 SMA6F20A-M3/6B part is unused and in its original packaging.
Return procedure for SMA6F20A-M3/6B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F20A-M3/6B Tags
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Diodes Incorporated
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