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Vishay General Semiconductor - Diodes Division SMA6F40A-M3/I
- Part No.:
- SMA6F40A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F40A-M3/I.pdf
- Description:
- 600W,40V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,236
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Product details
Overview
SMA6F40A-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) in SlimSMA (DO-221AC) package, designed to protect sensitive electronics against inductive switching transients and ESD events. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage at 9.3 A (10/1000 μs), 600 W peak pulse power, and IEC 61000-4-2 Level 4 ESD immunity (15 kV air / 8 kV contact).
For engineers reviewing the SMA6F40A-M3/I datasheet, SMA6F40A-M3/I pinout, SMA6F40A-M3/I application, or SMA6F40A-M3/I equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in industrial sensor interfaces, telecom power supplies, and automotive control modules where low-profile mounting and high surge resilience are required.
Technical Context
This TVS diode operates as a unidirectional Zener-clamped protector with fast response to transient surges. Its clamping behavior is defined by dynamic resistance (RD = 1.66 Ω) and junction temperature coefficient (αT = 10.1 × 10⁻⁴ /°C), enabling predictable voltage limiting across operating temperatures from –55 °C to +175 °C.
The device uses a silicon avalanche structure optimized for 10/1000 μs and 8/20 μs waveforms, delivering 600 W (10/1000 μs) and 4 kW (8/20 μs) peak pulse power. Its SlimSMA package supports automated placement and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - guaranteed breakdown threshold range for reliable triggering |
| VC @ IPP | 64.5 V at 9.3 A (10/1000 μs) - clamping voltage under standard surge, limiting downstream stress |
| PPPM (10/1000 μs) | 600 W - surge energy handling capacity for common lightning/inductive transients |
| ESD rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - validated electrostatic discharge immunity |
| Junction temp | –55 °C to +175 °C - extended thermal range suitable for under-hood and industrial environments |
| Package | SlimSMA (DO-221AC), 0.95 mm height - ultra-low profile for space-constrained PCB layouts |
Pinout & Package
SlimSMA (DO-221AC) surface-mount package with cathode band marking; 2-terminal unidirectional configuration; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction; connected to system ground or low-side reference | Provides return path for surge current during clamping; must be routed with low-inductance ground plane |
| Cathode | Current exit during reverse-biased clamping; connected to protected line | Connected to the rail or signal being protected; color band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile height | 0.95 mm typical - enables use in ultra-thin consumer and portable electronics assemblies |
| High-energy clamping | 600 W (10/1000 μs) and 4 kW (8/20 μs) - handles both slow inductive spikes and fast lightning surges |
| Automated placement ready | DO-221AC footprint with JESD201 Class 2 whisker resistance - compatible with high-speed SMT lines |
| Halogen-free & RoHS | M3 suffix indicates halogen-free molding compound and industrial-grade compliance - meets environmental and reliability mandates |
| ESD-hardened construction | 15 kV air / 8 kV contact per IEC 61000-4-2 Level 4 - eliminates need for additional ESD components on I/O lines |
Applications
| Industrial Sensor Interface | Telecom Power Input |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., 4–20 mA loops, RS-485 transceivers) from field-induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground, clamping surges before they reach precision ADCs or isolation amplifiers. Use Value: Prevents latch-up or permanent damage to 24 V sensor interface ICs during load dump or nearby relay switching events. | Use Scenario: Safeguarding primary DC input of telecom power supply units exposed to lightning-induced surges on outdoor copper lines. IC Role / Device Role / Timing Role: First-stage overvoltage clamp on 48 V input rail, absorbing multi-kW 8/20 μs transients before upstream converters. Use Value: Enables compliance with ITU-T K.20/21 immunity requirements without adding bulkier MOV-based solutions. |
| Automotive Body Control Module | Consumer USB-C Power Delivery |
Use Scenario: Protecting LIN bus lines and switched 12 V loads (e.g., door locks, lighting) from battery dump and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS on each protected line, leveraging low leakage (<0.2 μA at 40 V) to avoid parasitic drain. Use Value: Maintains ISO 16750-2 pulse 5a/b compliance while fitting within tight module height constraints (≤1.0 mm). | Use Scenario: Clamping VBUS overvoltage on USB-C receptacles during hot-plug events or adapter faults in portable chargers and docks. IC Role / Device Role / Timing Role: Secondary protection after primary OVP IC, absorbing fast 100 ns–1 μs transients that bypass active circuitry. Use Value: Prevents catastrophic failure of USB PD controllers and port power switches during ±20 V fault conditions. |
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/H | Same electrical specs; differs only in tape-and-reel packaging (3500 pcs vs. 14000 pcs per reel) | No functional difference; selection driven by production volume and SMT feeder compatibility | Choose SMA6F40A-M3/H for pilot runs or low-volume assembly; SMA6F40A-M3/I for high-throughput manufacturing |
| SMAJ40A-M3/5B | Higher clamping voltage (64.5 V vs. 69.4 V), lower RD (1.66 Ω vs. 2.05 Ω), same VWM/VBR, but in larger SMA (DO-214AC) package (2.3 mm height) | Less suitable for ultra-low-profile designs; better thermal dissipation on FR4 due to larger pad area | Select SMAJ40A-M3/5B when board layout allows >2 mm component height and higher long-duration surge margin is needed |
Compared with SMA6F40A-M3/H, the SMA6F40A-M3/I offers identical protection performance with higher reel quantity for cost-efficient high-volume production; versus SMAJ40A-M3/5B, it trades off some thermal mass for 60 % lower profile-critical for slim handheld and automotive ECUs.
Availability
SMA6F40A-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom power inputs, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for SMA6F40A-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMA6F series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in space-constrained, high-reliability DC power and signal line applications across industrial, telecom, and automotive sectors.
FAQ
What is the maximum clamping voltage of the SMA6F40A-M3/I under a 10/1000 μs surge?
The SMA6F40A-M3/I has a maximum clamping voltage (VC) of 64.5 V at 9.3 A for a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 89458) and defines the upper voltage limit imposed on protected circuits during such transients. The SMA6F40A-M3/I maintains this clamping performance across its full operating temperature range.
Is the SMA6F40A-M3/I suitable for bidirectional transient protection?
No, the SMA6F40A-M3/I is a unidirectional TVS diode and is not rated for bidirectional operation. It conducts only in reverse bias above VBR and blocks forward current like a standard diode. For bidirectional protection, a dedicated bidirectional TVS such as SMBJ40CA or an external series diode configuration would be required. The SMA6F40A-M3/I datasheet explicitly states "Unidirectional only" in its FEATURES section.
What does the "/I" suffix indicate in SMA6F40A-M3/I?
Within the SMA6F40A-M3/I ordering code, the "/I" suffix denotes the preferred package code for 13-inch diameter plastic tape-and-reel delivery containing 14,000 units. This distinguishes it from the "/H" variant (7-inch reel, 3,500 units), while both share identical electrical, thermal, and mechanical specifications. The SMA6F40A-M3/I and SMA6F40A-M3/H are functionally interchangeable in circuit design.
Does the SMA6F40A-M3/I meet automotive AEC-Q200 requirements?
The SMA6F40A-M3/I is not AEC-Q200 qualified. While it operates across –55 °C to +175 °C and is used in automotive body control modules, Vishay does not list this part under its AEC-Q200-certified portfolio. For automotive applications requiring formal qualification, engineers should consider Vishay's AEC-Q200-compliant alternatives such as the 1.5SMC40A-Q or similar qualified TVS families. The SMA6F40A-M3/I remains appropriate for non-safety-critical automotive subsystems where customer validation suffices.
How does the thermal resistance of the SMA6F40A-M3/I affect its power derating?
The SMA6F40A-M3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on FR4 PCB with 2 oz. copper. At ambient temperatures above 25 °C, its power dissipation must be linearly derated: for example, at 85 °C ambient, maximum continuous power drops to approximately 4.4 W (calculated from PD = 8 W × (1 − (85 − 55)/125)). This derating ensures TJ stays within the 175 °C absolute maximum, preserving reliability. The SMA6F40A-M3/I datasheet provides the full derating curve in Figure 5.
SMA6F40A-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):
- 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/I FAQ
1.How can I place an order for SMA6F40A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F40A-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 SMA6F40A-M3/I reliable?
The price and inventory of SMA6F40A-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 SMA6F40A-M3/I is usually 5 days.
3.What payment methods are accepted for SMA6F40A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F40A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F40A-M3/I?
SMA6F40A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F40A-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 SMA6F40A-M3/I?
For technical support, including SMA6F40A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F40A-M3/I requirements.
6.How does Aetrix verify that SMA6F40A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMA6F40A-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 SMA6F40A-M3/I meets industry standards.
7.What is the process for return or replacement of SMA6F40A-M3/I?
All SMA6F40A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F40A-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 SMA6F40A-M3/I part is unused and in its original packaging.
Return procedure for SMA6F40A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F40A-M3/I Tags
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