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Vishay General Semiconductor - Diodes Division SMA6F40A-M3/H
- Part No.:
- SMA6F40A-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F40A-M3/H.pdf
- Description:
- 600W,40V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,045
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Product details
Overview
SMA6F40A-M3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SlimSMA (DO-221AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A (10/1000 μs), 600 W peak pulse power rating, and IEC 61000-4-2 Level 4 ESD immunity (15 kV air / 8 kV contact).
For engineers reviewing the SMA6F40A-M3/H datasheet, SMA6F40A-M3/H pinout, SMA6F40A-M3/H application, or SMA6F40A-M3/H equivalent, this device serves as a low-profile (0.95 mm height), RoHS-compliant, halogen-free transient protector for ICs, MOSFETs, and sensor signal lines in consumer, industrial, telecom, and computing systems.
Technical Context
The SMA6F40A-M3/H operates as a Zener-based unidirectional TVS diode with a breakdown voltage range of 44.4–49.1 V at 1 mA test current. Its clamping behavior follows VC = RD × IPP + VBR(max), where dynamic resistance RD is 1.66 Ω and temperature coefficient αT is 10.1 × 10−4/°C. It supports surge handling per 10/1000 μs and 8/20 μs waveforms with derating above 25 °C ambient.
Thermal performance is defined by RθJA = 120–150 °C/W (FR4 PCB, 2 oz.) and RθJM = 12–15 °C/W (junction-to-mount), enabling operation across −55 °C to +175 °C junction temperature. The device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak and exhibits <0.2 μA leakage at VWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold |
| VC @ 9.3 A (10/1000 μs) | 64.5 V - Clamped voltage seen by protected circuit during 600 W transient event |
| PPPM (10/1000 μs) | 600 W - Peak surge power survivability under standard lightning waveform |
| IPPM (8/20 μs) | 48.0 A - Peak surge current capability under high-energy 8/20 μs surge profile |
| ESD Rating | IEC 61000-4-2 Level 4 - Withstands 15 kV air & 8 kV contact discharge without degradation |
| Junction Temp Range | −55 °C to +175 °C - Enables use in automotive under-hood and industrial high-temp environments |
Pinout & Package
Package: SlimSMA (DO-221AC), ultra-low-profile surface-mount case with matte tin-plated leads, UL 94 V-0 molding compound, and cathode band marking. Dimensions: 4.15–4.35 mm length × 2.50–2.70 mm width × 0.95 mm typical height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or lower-potential node in unidirectional protection configuration |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line; color band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile height | 0.95 mm typical - Enables use in space-constrained portable and wearable electronics |
| Automated placement compatibility | DO-221AC footprint optimized for pick-and-place machines - Reduces assembly cost and improves yield |
| Halogen-free & RoHS-compliant | M3 suffix confirms industrial-grade compliance - Meets global environmental and safety regulations |
| MSL Level 1 rating | 260 °C peak reflow tolerance - Eliminates need for moisture-sensitive handling or baking prior to assembly |
| High ESD robustness | 15 kV air / 8 kV contact per IEC 61000-4-2 - Protects interfaces exposed to human interaction without external shielding |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
Use Scenario: Protection of microcontroller GPIOs and gate drivers from inductive kickback during relay or solenoid switching in PLCs and motor drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp transients below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic inputs while maintaining signal integrity during repetitive switching events. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and load-dump-induced spikes in vehicle cabin modules. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor on sensor output traces, positioned near connector entry point. Use Value: Ensures reliable operation over full −40 °C to +125 °C ambient range with no degradation after repeated 8 kV contact ESD events. |
| Telecom Power Supply Input | Consumer USB Port Protection |
Use Scenario: Secondary-side surge suppression on DC input rails of PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual transients that pass through primary-stage MOVs or GDTs. Use Value: Limits clamped voltage to 64.5 V, safeguarding downstream DC-DC converters rated for ≤75 V input. | Use Scenario: Data line protection on USB 2.0 ports in tablets and docking stations exposed to user-handled cables. IC Role / Device Role / Timing Role: Low-capacitance unidirectional suppressor on D+ and D− lines referenced to ground. Use Value: Maintains signal rise/fall times (<1 ns impact) while passing 15 kV air-gap ESD without bit errors or link drops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F40A-M3/6B | Same electrical specs; differs only in tape-and-reel packaging (14,000 pcs/reel vs. 3,500 pcs/reel) and package code "6B" instead of "H" | No functional difference; intended for high-volume automated assembly requiring larger reels | Select SMA6F40A-M3/6B when optimizing for feeder change frequency and total cost-per-unit in mass production |
| SMAJ40A-M3/5B | Higher PPPM (400 W vs. 600 W), larger SMA (DO-214AC) package (2.4 mm height), higher VC (64.5 V → 69.4 V), same VWM/VBR range | Less suitable for ultra-thin designs; better thermal dissipation on large copper areas but incompatible with SlimSMA footprints | Choose SMAJ40A-M3/5B only if board layout allows taller profile and requires marginally higher surge margin under 10/1000 μs conditions |
Compared with SMA6F40A-M3/H, SMA6F40A-M3/6B offers identical protection performance with different reel logistics, while SMAJ40A-M3/5B trades compactness for slightly higher surge capacity and thermal mass-neither is pin-compatible due to distinct DO-221AC vs. DO-214AC footprints.
Availability
SMA6F40A-M3/H is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, and telecom power supply input applications requiring stable component supply, consistent M3-grade material compliance, and verified SlimSMA packaging integrity.
Supply support for SMA6F40A-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, efficiency, and application-specific optimization.
The SMA6F series is part of Vishay's TRANSZORB® TVS family, engineered specifically for high-speed, low-profile transient suppression in space-constrained and high-reliability electronic systems across consumer, industrial, and automotive markets.
FAQ
What is the maximum clamping voltage of the SMA6F40A-M3/H under a 10/1000 μs surge?
The SMA6F40A-M3/H has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current under the 10/1000 μs waveform. This value is measured per standard test conditions and ensures protected circuits remain below critical voltage thresholds during common lightning-induced transients. The SMA6F40A-M3/H maintains this clamping performance across its specified operating temperature range.
Does the SMA6F40A-M3/H meet automotive qualification standards?
The SMA6F40A-M3/H is not AEC-Q200 qualified, but it operates across −55 °C to +175 °C junction temperature and meets IEC 61000-4-2 Level 4 ESD requirements-making it suitable for non-safety-critical automotive sensor interfaces and infotainment subsystems where full qualification is not mandated. For AEC-Q200 applications, consult Vishay's automotive-grade TVS portfolio. The SMA6F40A-M3/H remains a robust choice for industrial and telecom use cases.
How does the SlimSMA (DO-221AC) package of the SMA6F40A-M3/H compare to standard SMA (DO-214AC)?
The SlimSMA (DO-221AC) package of the SMA6F40A-M3/H measures 0.95 mm typical height versus ~2.4 mm for standard SMA (DO-214AC), reducing vertical space by >60%. Both share similar outline width/length but differ in lead geometry and thermal pad design. The SMA6F40A-M3/H's SlimSMA enables thinner end products and improved airflow in stacked PCB assemblies, though its RθJA is higher than DO-214AC variants due to reduced thermal mass.
Can the SMA6F40A-M3/H be used in bidirectional protection configurations?
No-the SMA6F40A-M3/H is explicitly unidirectional, as confirmed in the Vishay datasheet under FEATURES and PRIMARY CHARACTERISTICS. It conducts only in reverse breakdown and blocks forward current like a standard diode. For bidirectional protection, Vishay offers separate SMA6FxxCA ('C' suffix) variants. Using SMA6F40A-M3/H in bidirectional roles risks forward conduction failure or inadequate positive-going transient suppression.
What is the leakage current specification for the SMA6F40A-M3/H at its stand-off voltage?
The SMA6F40A-M3/H exhibits a maximum reverse leakage current (ID) of 0.2 μA at its 40 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss in battery-operated or high-impedance sensing circuits. Leakage remains below 1.0 μA up to 85 °C, preserving signal integrity in thermally demanding deployments of the SMA6F40A-M3/H.
SMA6F40A-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMA6F40A-M3/H FAQ
1.How can I place an order for SMA6F40A-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F40A-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 SMA6F40A-M3/H reliable?
The price and inventory of SMA6F40A-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 SMA6F40A-M3/H is usually 5 days.
3.What payment methods are accepted for SMA6F40A-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F40A-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F40A-M3/H?
SMA6F40A-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F40A-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 SMA6F40A-M3/H?
For technical support, including SMA6F40A-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F40A-M3/H requirements.
6.How does Aetrix verify that SMA6F40A-M3/H is sourced from the original manufacturer or authorized distributors?
All SMA6F40A-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 SMA6F40A-M3/H meets industry standards.
7.What is the process for return or replacement of SMA6F40A-M3/H?
All SMA6F40A-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F40A-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 SMA6F40A-M3/H part is unused and in its original packaging.
Return procedure for SMA6F40A-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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