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Vishay General Semiconductor - Diodes Division SMA6F45A-M3/I
- Part No.:
- SMA6F45A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F45A-M3/I.pdf
- Description:
- 600W,45V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,924
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Product details
Overview
SMA6F45A-M3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SlimSMA (DO-221AC) package, designed for clamping voltage transients on power and signal lines. It features 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.3 V maximum clamping voltage at 8.3 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 SMA6F45A-M3/I datasheet, SMA6F45A-M3/I pinout, SMA6F45A-M3/I application, or SMA6F45A-M3/I equivalent, key selection criteria include clamping performance under 10/1000 μs surges, thermal derating on FR4 PCBs, unidirectional polarity, MSL Level 1 reflow compatibility, and halogen-free RoHS-compliant construction.
Technical Context
This TVS diode operates as a voltage-clamped overvoltage protection device, leveraging Zener avalanche breakdown to divert transient energy away from sensitive downstream circuitry. Its unidirectional configuration supports DC-biased lines with cathode-anode polarity, and its low dynamic resistance (2.05 Ω) ensures tight clamping during fast transients.
The device is rated for junction temperatures up to 175 °C and exhibits a positive voltage temperature coefficient (αT = 10.2 × 10⁻⁴ /°C), enabling predictable VBR drift across operating range. Thermal resistance junction-to-ambient is 120–150 °C/W on standard FR4, requiring layout-aware thermal management for sustained surge duty.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before leakage exceeds 0.2 μA |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold for reliable turn-on during overvoltage events |
| VC @ IPP | 72.3 V at 8.3 A (10/1000 μs) - Clamping voltage limiting stress on protected ICs or MOSFETs |
| PPPM | 600 W (10/1000 μs) - Surge energy handling capacity per industry-standard waveform |
| RD | 2.05 Ω - Low dynamic resistance ensuring minimal voltage overshoot during high-current transients |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - Validated electrostatic discharge immunity |
| Package | SlimSMA (DO-221AC) - 0.95 mm profile enabling ultra-thin PCB designs and automated placement |
Pinout & Package
SlimSMA (DO-221AC) package with cathode indicated by color band; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards; M3 suffix denotes halogen-free, RoHS-compliant, industrial-grade construction meeting JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction; connected to lower-potential side of protected line | Reference node for unidirectional clamping - must be tied to ground or return path in DC-biased applications |
| Cathode | Current exit during reverse-biased clamping; marked by color band | Connected to protected line - absorbs transient energy when voltage exceeds VWM and triggers avalanche breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile | 0.95 mm typical height - enables use in space-constrained consumer and portable electronics |
| Automated placement compatibility | DO-221AC footprint optimized for pick-and-place machines - reduces assembly cost and defect rate |
| High-energy clamping | 600 W (10/1000 μs) and 4 kW (8/20 μs) - protects against both lightning-induced and inductive-switching transients |
| MSL Level 1 rating | Reflow capable up to 260 °C peak - eliminates pre-baking requirements and simplifies SMT process flow |
| Halogen-free & RoHS | M3 suffix confirms compliance with environmental directives and industrial reliability standards |
Applications
| Power Supply Input Protection | USB Data Line Protection |
|---|---|
Use Scenario: Protecting 5 V or 12 V DC input rails in industrial power supplies from load dump or hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp surges before they reach DC-DC converters or LDOs. Use Value: Limits voltage to ≤72.3 V during 8.3 A transients, preventing damage to downstream regulators rated for <100 V absolute maximum. | Use Scenario: Safeguarding USB 2.0 D+ and D− lines in host controllers or peripheral devices against ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectionally paired (two devices) or used with series impedance to suppress ±15 kV HBM ESD pulses without signal distortion. Use Value: Maintains <1 pF junction capacitance at zero bias (per family data), preserving signal integrity up to 480 Mbps while meeting IEC 61000-4-2 Level 4. |
| Automotive Body Control Module | Sensor Signal Conditioning |
Use Scenario: Shielding LIN bus or 12 V sensor supply lines in automotive BCMs from battery transients and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to shunt energy before it propagates into microcontroller I/O or analog front-end circuits. Use Value: Withstands 175 °C junction temperature and delivers stable clamping across -55 °C to +125 °C ambient, satisfying AEC-Q200 stress requirements. | Use Scenario: Protecting analog outputs of pressure, temperature, or current sensors exposed to EMI or accidental wiring faults. IC Role / Device Role / Timing Role: Placed across sensor output and ground to prevent latch-up or gate oxide rupture in op-amps or ADC drivers. Use Value: Ultra-low leakage (<0.2 μA at 45 V) avoids loading high-impedance sensor outputs, preserving measurement accuracy and offset stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F45A-M3/6B | Same electrical specs; differs only in tape-and-reel packaging (14,000 pcs/reel, 13″ diameter vs. 3,500 pcs/reel, 7″) | No functional difference - identical SlimSMA package, M3 material, and surge ratings | Select based on production volume and SMT line feeder compatibility |
| SMAJ45A | Higher RθJA (150 °C/W vs. 120–150 °C/W), same VWM/VBR/VC, but DO-214AC (SMA) package (2.3 mm height) | Less suitable for ultra-thin designs; requires larger PCB footprint and higher profile | Choose SMA6F45A-M3/I when board height <1.0 mm is critical or MSL Level 1 reflow is mandatory |
Compared with SMA6F45A-M3/6B, the /I suffix offers higher reel quantity for high-volume manufacturing; compared with SMAJ45A, the SlimSMA package delivers 60 % lower profile and improved thermal performance on FR4, making SMA6F45A-M3/I optimal for compact, thermally constrained layouts.
Availability
SMA6F45A-M3/I is available at Aetrix Electronics and suitable for industrial power supplies, USB interface protection, automotive body control modules, and sensor signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SMA6F45A-M3/I 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 and application-specific performance.
The SMA6FxxA series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in space-constrained, high-reliability applications including automotive, industrial, and computing systems.
FAQ
What is the maximum clamping voltage of the SMA6F45A-M3/I under a 10/1000 μs surge?
The SMA6F45A-M3/I has a maximum clamping voltage (VC) of 72.3 V at 8.3 A for a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during such transients. The SMA6F45A-M3/I maintains this clamping performance across its specified operating temperature range and is validated per JEDEC test methods.
Does the SMA6F45A-M3/I support bidirectional transient suppression?
No, the SMA6F45A-M3/I is a unidirectional TVS diode, intended for DC-biased lines where polarity is fixed. It conducts only in reverse breakdown (cathode-to-anode) above VWM and does not suppress negative-going transients on AC or bipolar signals. For bidirectional protection, two SMA6F45A-M3/I devices may be used in series-opposed configuration, or a dedicated bidirectional part like SMA6F45CA should be selected.
What is the thermal resistance of the SMA6F45A-M3/I on a standard FR4 PCB?
The SMA6F45A-M3/I 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 and the recommended footprint. This value is critical for calculating safe power dissipation limits at elevated ambient temperatures and is defined per JEDEC 51-2A test methodology. Derating curves in the official Vishay datasheet (Doc. #89458) must be consulted for precise thermal design.
Is the SMA6F45A-M3/I compatible with lead-free reflow soldering processes?
Yes, the SMA6F45A-M3/I is rated for MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, fully compatible with standard lead-free soldering profiles. Its matte tin-plated terminals meet J-STD-002 and JESD22-B102 solderability requirements, and the M3 suffix confirms halogen-free, RoHS-compliant construction suitable for industrial-grade manufacturing.
How does the voltage temperature coefficient affect the SMA6F45A-M3/I's breakdown voltage?
The SMA6F45A-M3/I has a voltage temperature coefficient (αT) of 10.2 × 10⁻⁴ /°C, meaning its breakdown voltage increases linearly with junction temperature. At 125 °C, VBR rises approximately 10.2 % above its 25 °C value (50.0–55.3 V), resulting in ~55–61 V range. This behavior is accounted for in system-level surge margin calculations and ensures consistent clamping performance across the full -55 °C to +175 °C junction temperature range.
SMA6F45A-M3/I 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.3V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMA6F45A-M3/I FAQ
1.How can I place an order for SMA6F45A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F45A-M3/I 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 SMA6F45A-M3/I reliable?
The price and inventory of SMA6F45A-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F45A-M3/I is usually 5 days.
3.What payment methods are accepted for SMA6F45A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F45A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F45A-M3/I?
SMA6F45A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F45A-M3/I 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 SMA6F45A-M3/I?
For technical support, including SMA6F45A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F45A-M3/I requirements.
6.How does Aetrix verify that SMA6F45A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMA6F45A-M3/I 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 SMA6F45A-M3/I meets industry standards.
7.What is the process for return or replacement of SMA6F45A-M3/I?
All SMA6F45A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F45A-M3/I, 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 SMA6F45A-M3/I part is unused and in its original packaging.
Return procedure for SMA6F45A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F45A-M3/I Tags
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