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Vishay General Semiconductor - Diodes Division SMA6F43A-M3/H
- Part No.:
- SMA6F43A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F43A-M3/H.pdf
- Description:
- 600W,43V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:13,300
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Product details
Overview
SMA6F43A-M3/H 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 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), 69.8 V max clamping voltage at 8.6 A (10/1000 μs), 600 W peak pulse power, and IEC 61000-4-2 Level 4 ESD protection (15 kV air / 8 kV contact). It is used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMA6F43A-M3/H datasheet, SMA6F43A-M3/H pinout, SMA6F43A-M3/H application, or SMA6F43A-M3/H equivalent, key selection criteria include clamping voltage vs. surge current, thermal resistance (RθJA = 120–150 °C/W), unidirectional polarity, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on FR4 PCBs.
Technical Context
This TVS diode operates as a Zener-based overvoltage clamp, triggered when reverse voltage exceeds VBR, diverting transient energy to ground. Its low dynamic resistance (1.98 Ω) ensures tight clamping under 8.6 A (10/1000 μs) and 44.5 A (8/20 μs) pulses, while its 175 °C maximum junction temperature supports operation in harsh environments.
The device uses a silicon planar junction structure housed in a halogen-free, RoHS-compliant SlimSMA (DO-221AC) package with matte tin-plated leads. It meets JESD201 Class 2 whisker resistance and is rated for storage from –65 °C to +175 °C, with operating junction range –55 °C to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown threshold defining turn-on precision |
| VC @ IPP | 69.8 V at 8.6 A (10/1000 μs) - Actual clamped voltage seen by protected circuit during standard surge |
| PPPM | 600 W (10/1000 μs) - Surge energy handling capacity for common lightning-induced transients |
| IPP (8/20 μs) | 44.5 A - Peak current capability for fast-rising surges like EFT or induced switching noise |
| RθJA | 120–150 °C/W - Thermal resistance from junction to ambient on standard FR4 PCB, critical for power derating |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - Validated electrostatic immunity for end-equipment compliance |
Pinout & Package
Package: SlimSMA (DO-221AC), surface-mount, low-profile (0.95 mm typical height), cathode indicated by color band. Meets UL 94 V-0 flammability rating and MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; grounded reference during reverse clamping | Connected to system ground or low-impedance return path to sink transient current |
| Cathode | Current exit point during forward conduction; high-side connection during reverse clamping | Connected to protected line (e.g., VCC, signal trace) to clamp overvoltage to ground |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Protects only against negative transients on positive rails-ideal for DC power line suppression without affecting forward bias operation |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream components during surge events |
| 1.98 Ω dynamic resistance | Ensures predictable, repeatable clamping performance across production lots and temperature ranges |
| MSL Level 1 rating | Enables standard reflow soldering without pre-baking, reducing manufacturing complexity and cost |
| Halogen-free, RoHS-compliant construction | Meets global environmental compliance requirements for industrial and telecom end equipment |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and microcontrollers from inductive kickback during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: TVS clamps voltage spikes on 24 V control rails and isolated feedback paths to prevent latch-up or permanent damage. Use Value: Enables reliable operation at 175 °C junction temperature and withstands repetitive 600 W surges without degradation. | Use Scenario: Input-stage surge suppression on 48 V DC telecom rectifier outputs exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Acts as primary front-end clamp ahead of DC-DC converters and PMICs, limiting voltage to <70 V during 8/20 μs transients. Use Value: Delivers 44.5 A peak current handling and 4 kW (8/20 μs) pulse power to meet ITU-T K.20/21 immunity standards. |
| Automotive Body Control Modules | IoT Sensor Signal Conditioning |
Use Scenario: Reverse-polarity and load-dump protection on LIN bus and 12 V auxiliary power inputs in BCMs. IC Role / Device Role / Timing Role: Clamps transients up to 120 V during ISO 7637-2 Pulse 5a while maintaining low leakage (<0.2 μA at 43 V). Use Value: Unidirectional architecture avoids forward conduction interference with normal 12 V supply operation. | Use Scenario: ESD and EFT protection on analog sensor outputs (e.g., temperature, pressure) connected to ADC inputs in smart meters or edge nodes. IC Role / Device Role / Timing Role: Suppresses 8 kV contact / 15 kV air discharges per IEC 61000-4-2 without adding capacitance that degrades signal integrity. Use Value: Junction capacitance <100 pF at zero bias ensures minimal loading on high-impedance sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F43A-M3/6B | Same electrical specs; differs only in tape-and-reel packaging (14,000 pcs/reel, 13″ diameter vs. 3,500 pcs/reel, 7″ for -M3/H) | No functional difference; identical mounting, thermal, and electrical behavior | Select -M3/H for lower-volume SMT runs or prototyping where smaller reels reduce inventory overhead |
| SMAJ43A-M3/5B | Higher RθJA (150 °C/W), same VWM/VBR, but lower PPPM (400 W vs. 600 W) and higher VC (72.7 V) | Less robust clamping margin and lower surge endurance; suitable only for lower-energy transients | Choose SMA6F43A-M3/H when 600 W pulse rating and tighter 69.8 V clamping are required for mission-critical protection |
Compared with SMA6F43A-M3/6B, the SMA6F43A-M3/H offers identical protection performance in a smaller reel format; compared with SMAJ43A-M3/5B, it delivers 50 % higher surge power handling and 2.9 V lower clamping voltage-critical for safeguarding modern low-voltage ICs.
Availability
SMA6F43A-M3/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, long-term lifecycle support, and consistent surge immunity performance.
Supply support for SMA6F43A-M3/H 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, power efficiency, and ruggedized packaging.
The SMA6FxxA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in space-constrained, high-reliability applications across industrial, telecom, and automotive sectors.
FAQ
What is the maximum clamping voltage of the SMA6F43A-M3/H under a 10/1000 μs surge?
The SMA6F43A-M3/H has a maximum clamping voltage (VC) of 69.8 V at 8.6 A under a 10/1000 μs waveform. This value is measured per JEDEC-standard test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMA6F43A-M3/H maintains this clamping performance across its specified operating temperature range and is validated in the official Vishay datasheet document 89458.
Does the SMA6F43A-M3/H support automated SMT assembly?
Yes, the SMA6F43A-M3/H is optimized for automated surface-mount placement with its SlimSMA (DO-221AC) package, 0.95 mm typical height, and matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. Its MSL Level 1 rating allows direct placement into standard reflow profiles without pre-baking. The SMA6F43A-M3/H is supplied in 7″ plastic tape-and-reel format (3,500 pcs/reel), compatible with industry-standard pick-and-place equipment.
How does the SMA6F43A-M3/H compare to bidirectional TVS diodes in circuit design?
The SMA6F43A-M3/H is unidirectional and protects only against negative-going transients on positive rails-making it ideal for DC power line clamping where forward conduction must be avoided. Unlike bidirectional variants, it exhibits no leakage or conduction during normal positive bias, preserving signal integrity and power efficiency. The SMA6F43A-M3/H requires correct polarity orientation (cathode toward protected line) and is not interchangeable with bidirectional types without schematic revision.
What is the thermal resistance and power derating behavior of the SMA6F43A-M3/H?
The SMA6F43A-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120–150 °C/W when mounted on a standard FR4 PCB with 2 oz. copper. Its power dissipation derates linearly above 25 °C ambient, reaching 0 W at 150 °C ambient per the published derating curve. At TA = 55 °C, the device supports 8 W continuous power dissipation. These values are confirmed in the Vishay SMA6F5.0A–SMA6F130A datasheet (Rev. 17-Sep-2021, Doc. #89458) for the SMA6F43A-M3/H.
Is the SMA6F43A-M3/H compliant with environmental and reliability standards?
Yes, the SMA6F43A-M3/H is halogen-free, RoHS-compliant, and qualified to MSL Level 1 per J-STD-020 with a maximum reflow peak temperature of 260 °C. It passes JESD201 Class 2 whisker testing and meets UL 94 V-0 flammability requirements. Its construction supports storage from –65 °C to +175 °C and operating junction temperatures up to +175 °C. All compliance data for the SMA6F43A-M3/H is documented in Vishay's official specification sheet.
SMA6F43A-M3/H 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.8V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-221AC (SlimSMA)
SMA6F43A-M3/H FAQ
1.How can I place an order for SMA6F43A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F43A-M3/H 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 SMA6F43A-M3/H reliable?
The price and inventory of SMA6F43A-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F43A-M3/H is usually 5 days.
3.What payment methods are accepted for SMA6F43A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F43A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F43A-M3/H?
SMA6F43A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F43A-M3/H 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 SMA6F43A-M3/H?
For technical support, including SMA6F43A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F43A-M3/H requirements.
6.How does Aetrix verify that SMA6F43A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMA6F43A-M3/H 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 SMA6F43A-M3/H meets industry standards.
7.What is the process for return or replacement of SMA6F43A-M3/H?
All SMA6F43A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F43A-M3/H, 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 SMA6F43A-M3/H part is unused and in its original packaging.
Return procedure for SMA6F43A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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