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Diodes Incorporated SMF4L11AQ-7
- Part No.:
- SMF4L11AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L11AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,208
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Product details
Overview
SMF4L11AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in automotive and industrial power rails. It features a 11V working peak reverse voltage (VRWM), 12.2–13.5V breakdown voltage (VBR), 18.2V maximum clamping voltage (VC) at 22A surge current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMF4L11AQ-7 datasheet, SMF4L11AQ-7 pinout, SMF4L11AQ-7 application, or SMF4L11AQ-7 equivalent, key selection criteria include clamping performance under 10/1000µs surge, IEC61000-4-2 ±30kV ESD immunity, DO-219AA package thermal resistance (RθJA = 96°C/W), and unidirectional polarity marking with cathode band.
Technical Context
This TVS diode operates as a fast-acting shunt protector in DC power lines, triggering when transient voltage exceeds its breakdown threshold to divert surge energy away from sensitive downstream circuitry. Its sub-1ns response time ensures protection against ESD and lightning-induced transients before damage occurs.
The device uses silicon avalanche junction technology optimized for low clamping ratio (VC/VRWM ≈ 1.65) and stable leakage (<0.5µA at VRWM). It is rated for 400W peak pulse power (10/1000µs waveform), 40A non-repetitive forward surge current, and operates across –55°C to +175°C ambient range - meeting stringent automotive under-hood requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin. |
| VBR (min/max) | 12.2V / 13.5V - Breakdown occurs within this range at 1mA test current; defines turn-on consistency. |
| VC @ IRSM | 18.2V at 22A - Clamping voltage during 10/1000µs surge; determines maximum stress on protected ICs. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; defines single-event surge capacity. |
| IR @ VRWM | <0.5µA - Reverse leakage at rated standoff voltage; ensures minimal quiescent power loss. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - Validates robustness against human-body-model ESD events. |
| Operating Temp | –55°C to +175°C - Enables placement near high-temperature sources (e.g., engine control units, power converters). |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic package (1.90mm × 2.80mm × 3.80mm), halogen-free, RoHS-compliant, with matte tin-plated copper alloy leadframe and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Current path during reverse-biased clamping; must be routed with low-inductance ground plane. |
| Cathode (marked by band) | High-side connection to protected line (e.g., 12V rail) | Defines unidirectional polarity; connects to input side of load; clamps positive transients only. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains. |
| DO-219AA footprint | Enables high-density PCB layout with 30% smaller area vs. SMA; supports automated optical inspection (AOI) via top-view marking. |
| Fast response time | <1.0ns turn-on from 0V to VBR - limits voltage overshoot during nanosecond-scale ESD events. |
| Green construction | Halogen- and antimony-free molding compound (Br+Cl <1500ppm, Sb <1000ppm); meets automotive environmental compliance mandates. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery feed line in vehicle infotainment head unit exposed to load-dump and jump-start transients. IC Role / Device Role: Primary shunt TVS at main power entry point, upstream of DC-DC converter input. Use Value: Limits clamped voltage to ≤18.2V, protecting 24V-rated buck controller ICs and preventing latch-up or gate oxide failure. |
Use Scenario: 24V analog sensor signal line (e.g., pressure transducer) in factory automation PLC module. IC Role / Device Role: Localized transient suppression adjacent to connector interface, before signal conditioning amplifier. Use Value: Maintains signal integrity by suppressing 1kV EFT bursts without adding capacitance (>100pF would distort 10kHz sensor bandwidth). |
| USB-C Power Delivery Input | Telematics Module Battery Backup Line |
Use Scenario: VBUS line protection in automotive USB-C charging port subjected to hot-plug and cable discharge events. IC Role / Device Role: First-line defense against ±30kV contact ESD per IEC61000-4-2, placed before USB PD controller. Use Value: Prevents controller reset or permanent damage while maintaining <0.5µA leakage to avoid battery drain in parked state. |
Use Scenario: 3.3V backup supply line powering real-time clock (RTC) and CAN transceiver SRAM in telematics gateway. IC Role / Device Role: Low-leakage TVS on coin-cell or supercapacitor backup rail to prevent reverse-current surge during main power fault. Use Value: Ensures RTC continuity by blocking >11V transients without loading the microamp-level backup current budget. |
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 | Higher clamping voltage (20.8V @ 21.2A); SMA package (larger footprint, RθJA = 100°C/W) | Less suitable for space-constrained automotive modules requiring tight voltage margins | Prefer SMF4L11AQ-7 where board area and thermal performance are critical. |
| TPSMD11A | Same DO-219AA package but higher leakage (≤1µA); not AEC-Q101 qualified | Limited to commercial/industrial use; lacks automotive change control and PPAP support | Choose SMF4L11AQ-7 for OEM automotive programs requiring full traceability and qualification documentation. |
Compared with SMAJ11A and TPSMD11A, SMF4L11AQ-7 delivers superior thermal efficiency (RθJA = 96°C/W), tighter clamping (18.2V vs. ≥20.8V), and full automotive qualification - making it optimal for high-reliability, space-constrained 12V rail protection.
Availability
SMF4L11AQ-7 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, USB-C power delivery inputs, and telematics backup power systems requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF4L11AQ-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 analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and consumer markets.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive-grade transient suppression in harsh environments - emphasizing low clamping, fast response, and green packaging compliance.
FAQ
What is the polarity configuration of SMF4L11AQ-7?
SMF4L11AQ-7 is a unidirectional TVS diode, identified by a visible cathode band on the DO-219AA package. It conducts only during positive transients on the cathode side relative to anode, making it suitable for DC power line protection where polarity is fixed and reverse-voltage events are not expected.
Does SMF4L11AQ-7 require derating at elevated temperatures?
Yes - its peak pulse power rating decreases linearly above +25°C ambient, following the derating curve in Figure 1 of DS43393. At +125°C, maximum PPK drops to approximately 220W. Designers must apply thermal modeling to ensure junction temperature remains below +175°C during surge events.
How does the DO-219AA package affect PCB layout and thermal performance?
The DO-219AA's compact size (1.90mm × 2.80mm) reduces parasitic inductance and enables placement directly at connectors or IC inputs. Its low RθJA (96°C/W) requires a minimum 1" × 1" 2oz copper pad for rated power dissipation; thermal vias beneath the cathode tab further improve heat transfer to internal ground planes.
Is SMF4L11AQ-7 compatible with lead-free reflow profiles?
Yes - it is fully compatible with standard JEDEC J-STD-020 Level 1 reflow profiles. The matte tin finish on the copper alloy leadframe supports soldering at peak temperatures up to 260°C, and the package is rated for moisture sensitivity level 1, eliminating bake requirements prior to assembly.
SMF4L11AQ-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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L11AQ-7 FAQ
1.How can I place an order for SMF4L11AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L11AQ-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 SMF4L11AQ-7 reliable?
The price and inventory of SMF4L11AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L11AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L11AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L11AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L11AQ-7?
SMF4L11AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L11AQ-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 SMF4L11AQ-7?
For technical support, including SMF4L11AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L11AQ-7 requirements.
6.How does Aetrix verify that SMF4L11AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L11AQ-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 SMF4L11AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L11AQ-7?
All SMF4L11AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L11AQ-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 SMF4L11AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L11AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L11AQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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