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Diodes Incorporated SMF4L26A-7
- Part No.:
- SMF4L26A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L26A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,444
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Product details
Overview
SMF4L26A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in power rails and I/O lines. It features a 26V working peak reverse voltage (VRWM), 28.9V minimum breakdown voltage (VBR), 42.1V maximum clamping voltage (VC) at 9.5A peak pulse current, and delivers ±30kV ESD immunity per IEC61000-4-2 - ideal for automotive battery interface and industrial sensor power conditioning.
For engineers reviewing the SMF4L26A-7 datasheet, SMF4L26A-7 pinout, SMF4L26A-7 application, or SMF4L26A-7 equivalent, this device is selected for high-reliability DC power line protection where fast response (<1.0ns), low leakage (<0.5µA), and AEC-Q200-compatible packaging are critical design requirements.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging silicon avalanche breakdown to divert transients above VBR while maintaining low dynamic impedance. Its DO-219AA package enables compact PCB layout with thermal resistance RθJA = 96°C/W and junction-to-solder-point RθJS = 70°C/W under standard FR-4 mounting.
The device sustains 400W peak pulse power (10/1000µs waveform), supports 40A non-repetitive forward surge current (8.3ms half-sine), and exhibits <3V forward voltage at 16A - enabling effective coordination with upstream fuses and downstream ICs in 12–24V automotive and industrial systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24V nominal systems. |
| VBR (min) | 28.9V @ 1mA - Guaranteed avalanche initiation threshold; ensures predictable turn-on during fast transients. |
| VC (max) | 42.1V @ 9.5A - Peak clamped voltage seen by protected circuit; determines survivability of downstream 33V-rated components. |
| IPP (max) | 9.5A - Maximum peak pulse current it can safely shunt without degradation; correlates to 400W rating at 42.1V. |
| IR @ VRWM | <0.5µA - Ultra-low reverse leakage; minimizes standby power loss in battery-powered applications. |
| ESD Rating | ±30kV contact/air per IEC61000-4-2 - Enables direct protection of exposed connectors without external shielding. |
| Response Time | <1.0ns - Sub-nanosecond turn-on ensures suppression of EFT/burst events before sensitive logic is disturbed. |
Pinout & Package
Package: DO-219AA - ultra-compact, flat-lead surface-mount package (2.80mm × 1.90mm × 0.60mm height), RoHS-compliant matte tin finish on copper alloy lead frame, moisture sensitivity level 1, UL 94V-0 molded plastic body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Current return path during clamping; must be routed with minimal inductance to maintain low VC. |
| Cathode | High-side connection to protected line (e.g., battery+, CAN_H) | Marked by cathode band; carries full transient current into ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power (10/1000µs) | Enables single-device protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges in 24V systems. |
| DO-219AA Package Footprint | Reduces board area by ~40% vs. SMA/SMB; compatible with high-density automotive ECUs and space-constrained IoT modules. |
| IEC61000-4-2 ±30kV ESD Protection | Eliminates need for secondary ESD stages on USB, LIN, or sensor interfaces - simplifies BOM and layout. |
| AEC-Q200 Qualified Process | Manufactured in IATF 16949-certified facilities with PPAP capability; supports automotive qualification without retesting. |
| Lead-Free & Halogen-Free ("Green") | Complies with RoHS 3 (2015/863/EU) and JEDEC J-STD-020; eliminates brominated flame retardants and antimony compounds. |
Applications
| Automotive Battery Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: 12V/24V battery feed line in engine control units subject to load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to limit voltage excursion to ≤42.1V. Use Value: Prevents damage to 33V-rated CAN transceivers and microcontrollers during ISO 7637-2 Pulse 5a (load dump up to 60V). |
Use Scenario: Analog input channel of a temperature/humidity sensor module exposed to ESD during field servicing. IC Role / Device Role / Timing Role: First-line ESD suppressor on signal line between connector and ADC front-end. Use Value: Absorbs ±30kV contact discharge without latch-up or parametric shift, preserving measurement accuracy. |
| USB-C Power Delivery Line | Smart Meter Power Supply Input |
Use Scenario: VBUS line in USB-C PD sink implementation handling up to 20V/5A, vulnerable to hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND to clamp overshoot during plug insertion. Use Value: Limits VBUS spike to 42.1V during 100ns edge events, protecting PD controller and buck converter MOSFETs. |
Use Scenario: AC/DC adapter output feeding meter MCU and RTC, exposed to lightning-induced surges on utility grid. IC Role / Device Role / Timing Role: Secondary surge protector after MOV, providing precise clamping and low leakage. Use Value: Maintains <0.5µA leakage across -40°C to +85°C, ensuring >10-year RTC backup battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same VRWM (26V) but SMA package (larger footprint, RθJA = 60°C/W); 400W rating, 43.5V VC @ 9.2A. | Higher thermal resistance limits sustained surge duty cycle; less suitable for sealed enclosures with no airflow. | Select when legacy SMA layout exists and board space is not constrained. |
| TPSMD26A | DO-214AB package; identical VRWM/VBR/VC specs but higher IR (1µA) and no AEC-Q200 qualification. | Lacks automotive process controls and PPAP documentation; unsuitable for Tier-1 automotive programs. | Select for cost-sensitive industrial applications where AEC-Q200 is not mandated. |
Compared with SMAJ26A and TPSMD26A, SMF4L26A-7 delivers superior thermal performance in minimal area (DO-219AA), guaranteed AEC-Q200 compliance, and lower leakage - making it the preferred choice for next-gen automotive ECUs and high-density portable electronics requiring long-term reliability.
Availability
SMF4L26A-7 is available at Aetrix Electronics and suitable for automotive battery management, industrial sensor interface, and USB-C power delivery applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for SMF4L26A-7 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q standards.
SMF4L26A-7 belongs to the SMF4L series of high-power TVS diodes engineered specifically for automotive-grade transient suppression in harsh environments - emphasizing low clamping voltage, fast response, and robust package reliability.
FAQ
What is the maximum clamping voltage of SMF4L26A-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 42.1V at 9.5A peak pulse current (10/1000µs waveform), measured per JEDEC-standard test conditions. This value ensures downstream 33V-rated ICs remain within absolute maximum ratings during surge events, and is validated across -55°C to +175°C operating temperature range.
Is SMF4L26A-7 qualified for automotive use per AEC-Q200?
Yes - SMF4L26A-7 is manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 Rev H for stress testing including temperature cycling, humidity bias, and mechanical shock. It supports PPAP documentation and change control required by Tier-1 automotive suppliers.
How does the DO-219AA package improve thermal performance versus SMA?
Despite its smaller size, DO-219AA achieves RθJS = 70°C/W (junction-to-solder-point) due to optimized copper lead frame geometry and direct die-to-pad thermal path - outperforming SMA's typical RθJS of 100°C/W. This allows higher surge repetition rates in thermally constrained layouts.
Can SMF4L26A-7 replace bi-directional TVS devices in signal line protection?
No - SMF4L26A-7 is unidirectional (cathode-banded) and only protects against positive transients on the cathode side. For bidirectional signal lines like RS-485 or CAN, SMF4L26CA (its bi-directional counterpart) must be used to suppress both polarities without DC bias complications.
SMF4L26A-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-219AA
- Series:
- SMF4L
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L26A-7 FAQ
1.How can I place an order for SMF4L26A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L26A-7 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 SMF4L26A-7 reliable?
The price and inventory of SMF4L26A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L26A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L26A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L26A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L26A-7?
SMF4L26A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L26A-7 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 SMF4L26A-7?
For technical support, including SMF4L26A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L26A-7 requirements.
6.How does Aetrix verify that SMF4L26A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L26A-7 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 SMF4L26A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L26A-7?
All SMF4L26A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L26A-7, 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 SMF4L26A-7 part is unused and in its original packaging.
Return procedure for SMF4L26A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L26A-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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