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Diodes Incorporated SMF4L11A-7
- Part No.:
- SMF4L11A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L11A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,961
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Product details
Overview
SMF4L11A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 11V working peak reverse voltage (VRWM), 12.2–13.5V breakdown voltage (VBR) at 1mA, 18.2V maximum clamping voltage (VC) at 22A surge current, and sub-1ns response time - deployed in automotive battery interfaces, USB port ESD protection, and industrial sensor I/O conditioning.
For engineers reviewing the SMF4L11A-7 datasheet, SMF4L11A-7 pinout, SMF4L11A-7 application, or SMF4L11A-7 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, 400W 10/1000µs pulse rating under transient stress, DO-219AA package thermal resistance (RθJA = 96°C/W), and IEC 61000-4-2 ±30kV air/contact ESD compliance.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 12.2V minimum breakdown threshold. Its low 18.2V clamping voltage at 22A ensures downstream ICs remain within safe operating limits during 8/20µs surges or ESD events.
The device uses silicon planar junction technology with a cathode band marking, optimized for fast turn-on (<1.0ns) and minimal parasitic capacitance (typ. 120pF at 0V). Thermal design leverages the DO-219AA package's 70°C/W junction-to-solder-point resistance and 1.0W steady-state dissipation capability on standard FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform): sustains high-energy transients without failure |
| Clamping Voltage VC | 18.2V at 22A: limits voltage seen by protected circuit during surge |
| Breakdown Voltage VBR | 12.2V–13.5V @ 1mA: defines precise conduction onset for reliable triggering |
| Reverse Leakage IR | ≤0.5µA @ 11V VRWM: minimizes standby power loss in battery-powered systems |
| ESD Rating | ±30kV (air/contact per IEC 61000-4-2): meets highest system-level ESD immunity requirements |
| Response Time | <1.0ns (unidirectional): activates before most IC damage thresholds are exceeded |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic case (2.80 × 1.90 × 0.60 mm), halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to GND or lowest potential node; enables unidirectional clamping from cathode to anode |
| Cathode (marked band) | High-side transient input terminal | Connected to protected line (e.g., VBUS, CAN_H); conducts surge current to ground when VRWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Enables single-device protection against ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-5 combination wave surges |
| 18.2V clamping at 22A | Provides ≥1.8V margin below typical 20V absolute max ratings of automotive MCUs and transceivers |
| ±30kV IEC 61000-4-2 ESD | Eliminates need for additional ESD diodes in USB, LIN, or sensor interface designs |
| DO-219AA footprint | Reduces PCB area by 40% vs. SMA packages while maintaining thermal performance via optimized copper pad layout |
Applications
| Automotive Battery Protection | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting infotainment head unit power input from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps reverse polarity and surge energy on 12V rail before reaching DC-DC converter input. Use Value: Withstands 400W pulses and maintains <18.2V clamping to prevent overvoltage shutdown or latch-up in PMICs. | Use Scenario: Safeguarding USB D+ and D− lines against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Low-capacitance (120pF) unidirectional clamp shunts ±30kV ESD strikes to ground without signal distortion. Use Value: Preserves USB 2.0 signal integrity up to 480Mbps while meeting IEC 61000-4-2 Level 4 immunity. |
| Industrial Sensor Signal Conditioning | POS Terminal Power Input |
Use Scenario: Shielding 4–20mA analog sensor outputs from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: TVS placed at connector side to absorb common-mode transients before signal conditioning op-amps. Use Value: 12.2V VBR aligns with 24V loop supply headroom; 18.2V VC prevents op-amp input stage damage. | Use Scenario: Securing 5V/12V power input of retail point-of-sale terminals against AC line coupling and EFT bursts. IC Role / Device Role / Timing Role: Primary front-end clamp on main power rail, coordinated with fuse and MOV for staged protection. Use Value: 400W rating handles repetitive 10/1000µs surges per IEC 61000-4-4; RoHS/Green compliance supports global market access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Same 11V VRWM, but SMA package (larger footprint, RθJA = 100°C/W), lower 400W rating at 25°C only | Less suitable for space-constrained automotive modules; requires larger thermal pad | Select if legacy SMA layout exists and thermal derating margin is available |
| SMF4L11CA | Bi-directional variant; identical VRWM, VBR, VC, and package; symmetrical clamping for AC/communication lines | Required for differential bus protection (e.g., RS-485, CAN) where polarity reversal occurs | Choose only when bidirectional clamping is needed; not drop-in for unidirectional DC rail use |
Compared with SMAJ11A and SMF4L11CA, SMF4L11A-7 delivers superior board-area efficiency and thermal performance in unidirectional DC protection, while SMF4L11CA adds polarity-agnostic clamping at no size penalty - making the -7 variant optimal for compact, high-reliability 12V automotive and industrial power rail designs.
Availability
SMF4L11A-7 is available at Aetrix Electronics and suitable for automotive battery management, USB interface hardening, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for SMF4L11A-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 manufacturer of discrete semiconductors and integrated circuits, specializing in high-reliability protection, signal integrity, and power management solutions.
The SMF4L series belongs to Diodes' high-power TVS portfolio, engineered specifically for AEC-Q200-compliant automotive and harsh-environment industrial applications demanding robust ESD/surge immunity in miniature packages.
FAQ
What is the maximum clamping voltage of SMF4L11A-7 at rated surge current?
The maximum clamping voltage (VC) is 18.2V at 22A peak pulse current (10/1000µs waveform), measured per JEDEC standards. This value ensures protected circuits remain within safe operating voltage limits during transient events, and is validated across temperature range −55°C to +175°C with no derating required up to +125°C ambient.
Is SMF4L11A-7 qualified for automotive applications?
Yes - SMF4L11A-7 is manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 for passive components. While the base part number lacks a Q-suffix, it meets all mechanical, thermal, and reliability requirements for automotive use; Q-grade variants (e.g., SMF4L11AQ-7) are available for PPAP-controlled programs requiring formal change control documentation.
How does the DO-219AA package affect thermal performance compared to SMA?
The DO-219AA package achieves RθJA = 96°C/W (vs. SMA's ~100°C/W) due to optimized die attach and shorter thermal path to the cathode tab. When mounted on a 1"×1" FR-4 board with 2 oz. copper, its RθJS = 70°C/W enables higher sustained power handling than SMA equivalents - critical for repeated surge events in engine control units and ADAS modules.
Can SMF4L11A-7 replace older SMAJ11A in existing designs?
Yes, with layout adaptation: both share identical electrical specs (VRWM, VBR, VC, IPP), but SMF4L11A-7 uses DO-219AA (2.80 × 1.90 mm) vs. SMA (4.5 × 2.7 mm). Pad redesign is required; thermal simulation confirms improved junction temperature rise due to lower RθJA. No requalification is needed for ESD/surge performance, as test data matches or exceeds SMAJ11A.
SMF4L11A-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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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
SMF4L11A-7 FAQ
1.How can I place an order for SMF4L11A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L11A-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 SMF4L11A-7 reliable?
The price and inventory of SMF4L11A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L11A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L11A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L11A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L11A-7?
SMF4L11A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L11A-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 SMF4L11A-7?
For technical support, including SMF4L11A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L11A-7 requirements.
6.How does Aetrix verify that SMF4L11A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L11A-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 SMF4L11A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L11A-7?
All SMF4L11A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L11A-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 SMF4L11A-7 part is unused and in its original packaging.
Return procedure for SMF4L11A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L11A-7 Tags
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ESD9B5.0ST5G
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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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