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Diodes Incorporated SMF4L11CAQ-7
- Part No.:
- SMF4L11CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L11CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:5,633
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Product details
Overview
SMF4L11CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for automotive-grade overvoltage protection. It features a 11 V working peak reverse voltage (VRWM), 12.2–13.5 V breakdown voltage (VBR), 18.2 V maximum clamping voltage (VC) at 22 A surge current, and 400 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and used in battery contact and power management circuits to suppress ESD and load dump transients.
For engineers reviewing the SMF4L11CAQ-7 datasheet, SMF4L11CAQ-7 pinout, SMF4L11CAQ-7 application, or SMF4L11CAQ-7 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, IEC61000-4-2 ±30 kV ESD rating, DO-219AA mechanical dimensions, and real-world automotive use context - all without referencing external documentation.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal/power lines without polarity dependency. Its sub-5 ns response time ensures clamping before sensitive downstream circuitry sustains damage during fast transients like ISO 7637-2 pulse 1 or ESD events.
The device uses planar junction technology in a low-inductance DO-219AA surface-mount package, minimizing parasitic inductance to preserve clamping performance at high di/dt. Thermal resistance from junction to solder point (RθJS = 70 °C/W) supports reliable operation under repeated surge conditions in constrained automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse voltage before leakage exceeds 0.5 µA; sets operating margin below clamping threshold. |
| VBR (min/max) | 12.2 V / 13.5 V - Measured at 1 mA; defines guaranteed conduction onset window for predictable surge triggering. |
| VC @ IRSM | 18.2 V @ 22 A - Clamping voltage during 10/1000 µs surge; limits peak stress on protected ICs or connectors. |
| PPK | 400 W - Peak pulse power handling per 10/1000 µs waveform; enables robust protection against ISO 16750-2 load dump surges. |
| ESD Rating | ±30 kV air / ±30 kV contact per IEC61000-4-2 - Confirmed immunity to human-body-model ESD events in vehicle assembly and service environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive under temperature cycling, HTRB, and surge life testing; supports PPAP submission. |
| Package | DO-219AA - 2.8 × 1.9 mm surface-mount outline with 0.6 mm lead length; optimized for automated placement and thermal relief on 2 oz Cu pads. |
Pinout & Package
DO-219AA is a two-terminal, bi-directional surface-mount package with no polarity marking (no cathode band). Terminals are matte tin-plated copper alloy leads, solderable per MIL-STD-202 Method 208. Device weight is 0.016 g; moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional transient path | Either terminal serves as anode or cathode depending on transient polarity; enables single-device protection of bidirectional lines like CAN or LIN bus stubs. |
| Solder Pad Interface | Thermal and electrical interface | Low-inductance connection to PCB ground plane or protected line; RθJS = 70 °C/W enables effective heat dissipation during repetitive surges. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant with PPAP capability and IATF 16949 manufacturing - meets OEM Tier 1 supply chain requirements for engine control, body electronics, and infotainment. |
| Ultra-low clamping ratio | VC/VRWM = 1.65 - Tight voltage margin between standoff and clamping improves system-level surge margin without overdesigning downstream voltage tolerances. |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant (Br+Cl <1500 ppm, Sb <1000 ppm) - satisfies EU ELV and OEM sustainability mandates. |
| Fast transient response | <5.0 ns turn-on from 0 V to VBR - Ensures clamping activation prior to propagation delay of typical automotive microcontrollers or transceivers. |
Applications
| Automotive Battery Protection | CAN/LIN Bus Line Protection |
|---|---|
Use Scenario: Protects 12 V battery feed lines in start-stop systems against load dump transients up to 35 V and jump-start spikes. IC Role / Device Role / Timing Role: Standoff clamping device placed directly at battery connector entry point to shunt surge energy before reaching PMIC or MCU power rails. Use Value: Withstands 400 W pulses and maintains VRWM = 11 V, allowing safe operation across cold-crank (6.5 V) to load dump (35 V) extremes while avoiding false triggering. |
Use Scenario: Shields differential CAN FD or LIN physical layer transceivers from ESD events during vehicle assembly, service, or cable hot-plug. IC Role / Device Role / Timing Role: Bi-directional TVS placed across CANH–CANL or LIN–GND to clamp common-mode and differential transients without disrupting DC bias. Use Value: Sub-5 ns response and ±30 kV ESD rating prevent latch-up or damage in transceivers such as TCAN1042 or TLE7259, preserving communication integrity. |
| Infotainment USB Port Protection | ADAS Camera Power Input Protection |
Use Scenario: Secures USB 2.0 VBUS and D+/D− lines in head unit or rear-seat entertainment against ESD and coupling-induced surges. IC Role / Device Role / Timing Role: Dual-channel protection using discrete bi-directional TVS devices on each signal pair to maintain signal integrity at 480 Mbps. Use Value: Low capacitance (typ. 100 pF at 1 MHz) avoids signal rise-time degradation; 11 V VRWM aligns with 5 V USB power rail derating margins. |
Use Scenario: Guards 12 V input to image sensor modules in surround-view or front ADAS cameras exposed to harness-induced transients. IC Role / Device Role / Timing Role: Primary clamping element upstream of DC-DC converter to prevent overvoltage shutdown or MOSFET avalanche failure during ignition noise events. Use Value: 18.2 V VC limits peak stress on buck controller ICs (e.g., TPS65381), extending reliability in thermally constrained camera housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CA | DO-214AC package (4.5 × 2.7 mm); higher RθJA (110 °C/W); same VRWM/VBR/VC specs. | Larger footprint and lower thermal efficiency limit use in dense ADAS modules or thin-profile infotainment boards. | Select when legacy layout compatibility or higher surge repetition tolerance (due to larger die mass) is prioritized over space savings. |
| TPSMD11CA | DO-214AB package (7.1 × 6.2 mm); 600 W PPK; 12.2–13.5 V VBR; 19.5 V VC @ 24.5 A. | Higher power rating suits heavy-duty commercial vehicle applications but requires 3× board area vs. DO-219AA. | Choose for off-highway equipment or battery energy storage systems where surge energy exceeds 400 W but space constraints are relaxed. |
Compared with SMAJ11CA and TPSMD11CA, SMF4L11CAQ-7 delivers identical clamping performance in a 60% smaller footprint and 35% lower thermal resistance - making it optimal for modern automotive ECUs where PCB real estate and thermal management are critical.
Availability
SMF4L11CAQ-7 is available at Aetrix Electronics and suitable for automotive battery protection, CAN/LIN bus line protection, infotainment USB port protection, and ADAS camera power input protection requiring stable component supply across production lifecycles.
Supply support for SMF4L11CAQ-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive power line and data line surge suppression with emphasis on small size, high ESD immunity, and IATF 16949 process control.
FAQ
What is the maximum clamping voltage of SMF4L11CAQ-7 at its rated surge current?
The maximum clamping voltage (VC) is 18.2 V at 22 A peak pulse current (IRSM), measured under the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (–55 °C to +175 °C) and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMF4L11CAQ-7 unidirectional or bidirectional, and how is polarity identified?
SMF4L11CAQ-7 is a bi-directional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. It has no cathode band marking - the DO-219AA package is physically and electrically symmetrical, with identical electrical characteristics regardless of orientation on the PCB.
How does the DO-219AA package improve thermal performance compared to SMA or SMB packages?
The DO-219AA package achieves RθJS = 70 °C/W (junction-to-solder-point), significantly lower than SMA (RθJS ≈ 120 °C/W) due to its shorter internal leadframe and optimized thermal path to the PCB pad. This allows sustained surge duty cycles in automotive under-hood applications without exceeding 175 °C junction temperature.
Does SMF4L11CAQ-7 meet OEM-specific ESD test requirements beyond IEC61000-4-2?
Yes - its ±30 kV contact/air ESD rating exceeds common OEM requirements including GMW3172 (±25 kV), Ford ES-XW7T-1A278-AC (±25 kV), and VW80000 (±25 kV). The device has been validated in-system on multiple Tier 1 modules and supports full PPAP documentation per customer request.
SMF4L11CAQ-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:
- -
- Bidirectional Channels:
- 1
- 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
SMF4L11CAQ-7 FAQ
1.How can I place an order for SMF4L11CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L11CAQ-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 SMF4L11CAQ-7 reliable?
The price and inventory of SMF4L11CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L11CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L11CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L11CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L11CAQ-7?
SMF4L11CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L11CAQ-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 SMF4L11CAQ-7?
For technical support, including SMF4L11CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L11CAQ-7 requirements.
6.How does Aetrix verify that SMF4L11CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L11CAQ-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 SMF4L11CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L11CAQ-7?
All SMF4L11CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L11CAQ-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 SMF4L11CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L11CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L11CAQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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