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Diodes Incorporated SMF4L14CA-7
- Part No.:
- SMF4L14CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L14CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,589
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Product details
Overview
SMF4L14CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for ESD and surge protection on low-voltage signal and power lines. It features a 14V working peak reverse voltage (VRWM), 15.6V minimum breakdown voltage (VBR), 23.2V maximum clamping voltage (VC) at 17.2A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is used in automotive battery contacts and USB interface protection.
For engineers reviewing the SMF4L14CA-7 datasheet, SMF4L14CA-7 pinout, SMF4L14CA-7 application, or SMF4L14CA-7 equivalent, this page delivers verified electrical parameters, DO-219AA terminal mapping, IEC61000-4-2 ±30kV ESD performance, clamping behavior under transient stress, and direct alternatives with documented voltage and surge current differences.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or floating signal paths without polarity constraints. Its sub-1ns response time ensures suppression before downstream ICs experience overstress, and its low leakage (<0.5µA at VRWM) minimizes standby power impact in battery-powered systems.
The device uses silicon avalanche junction technology optimized for fast turn-on and stable clamping under repetitive transients. Thermal resistance from junction to solder point is 70°C/W, supporting reliable operation up to +175°C ambient when mounted per recommended 2 oz. copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 14 V - Maximum continuous reverse operating voltage before significant leakage; defines safe standoff for 12V automotive and USB 2.0/3.0 bus lines. |
| VBR (min) | 15.6 V - Minimum breakdown voltage at 1mA test current; guarantees conduction onset above normal operating voltage with margin. |
| VC (max) | 23.2 V - Maximum clamped voltage at 17.2A IPP; limits stress on protected ICs during 400W transient events. |
| IPP (max) | 17.2 A - Peak pulse current at VC; corresponds to 400W (10/1000µs waveform), sufficient for ISO 7637-2 Pulse 1/2a/3a surges. |
| IR (max) | 0.5 µA - Max reverse leakage at VRWM; ensures negligible quiescent current draw in always-on monitoring circuits. |
| ESD Rating | ±30 kV (air/contact per IEC61000-4-2); provides system-level immunity without external spark gaps or RC filters. |
| Package | DO-219AA - Surface-mount, 2.8 × 1.9 mm footprint; enables high-density PCB layouts while maintaining thermal performance via cathode-tab soldering. |
Pinout & Package
DO-219AA is a two-terminal surface-mount package with symmetrical bi-directional polarity: no cathode band marking. Terminals are co-planar matte tin-plated copper alloy leads, solderable per MIL-STD-202 Method 208. The cathode tab serves as primary thermal path to PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Bi-directional conduction allows identical clamping in both polarities; terminals interchangeable in layout. |
| Cathode Tab (exposed metal pad) | Thermal and mechanical anchor | Primary heat sink interface; must be connected to ≥1"² 2 oz. copper pour for rated 400W pulse handling. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD protection | ±30kV air/±30kV contact - eliminates need for additional ESD diodes in USB, CAN, LIN, and sensor interfaces. |
| Clamping ratio (VC/VBR) | 1.48 - tight ratio ensures minimal overvoltage overshoot during fast transients, critical for 3.3V/5V logic protection. |
| Response time | <5 ns (bi-directional) - activates before most microcontroller I/O pins enter latch-up or damage thresholds. |
| RoHS & Green compliance | Halogen-free, antimony-free, lead-free - meets automotive PPAP and IATF 16949 material traceability requirements. |
| JEDEC-qualified reliability | Qualified to AEC-Q200 stress tests - supports use in under-hood automotive modules and industrial control terminals. |
Applications
| Automotive Battery Protection | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protects body control module inputs from load dump and jump-start surges on 12V battery rails. IC Role / Device Role / Timing Role: Bi-directional TVS clamps negative-going transients (e.g., alternator ripple reversal) and positive spikes (e.g., ISO 7637-2 Pulse 1). Use Value: Withstands 400W pulses and maintains <0.5µA leakage at 14V VRWM, preserving low-power sleep mode integrity. |
Use Scenario: Shields USB D+/D− lines against ESD events during hot-plug insertion in infotainment head units. IC Role / Device Role / Timing Role: Fast-turn-on TVS diverts ±30kV ESD strikes away from USB transceiver PHY before data corruption occurs. Use Value: Sub-5ns response and 23.2V clamping prevent PHY latch-up while adding <0.3pF parasitic capacitance per line. |
| Industrial Sensor Interface | RS-485 Transceiver Protection |
Use Scenario: Safeguards analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bi-directional clamping absorbs induced lightning surges on long cable runs without polarity biasing. Use Value: 14V VRWM aligns with 10–15V sensor supply rails; low leakage avoids DC offset errors in precision measurement paths. |
Use Scenario: Guards RS-485 transceivers (e.g., MAX1487, SN65HVD72) against ground potential differences and EFT bursts. IC Role / Device Role / Timing Role: Clamps differential and common-mode transients simultaneously due to symmetrical bi-directional structure. Use Value: 23.2V VC ensures transceiver remains within absolute maximum ratings even during 4kV EFT (IEC61000-4-4) events. |
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 |
|---|---|---|---|
| SMAJ14CA | DO-214AC package; 200W rating; 25.1V VC at 12.3A IPP | Larger footprint (4.5 × 2.7 mm); lower power handling limits use in high-energy surge environments | Select when legacy SMA layout exists and 200W suffices; avoid for ISO 7637-2 Pulse 5a compliance. |
| SMF4L15CA | 15V VRWM; 16.7V VBR(min); 24.4V VC at 16.4A IPP | Higher standoff voltage better suits 13.5V nominal systems; slightly higher clamping increases risk for 3.3V IOs | Prefer for newer 12V+ designs with tighter tolerance margins; verify VC compatibility with downstream IC abs max ratings. |
Compared with SMAJ14CA, SMF4L14CA-7 delivers 2× peak power in 40% smaller area and lower clamping voltage; versus SMF4L15CA, it offers tighter VRWM alignment with standard 12V automotive rails but requires verification against 14V battery float conditions.
Availability
SMF4L14CA-7 is available at Aetrix Electronics and suitable for automotive battery management, USB interface protection, and industrial sensor conditioning requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMF4L14CA-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' high-reliability transient suppression portfolio, engineered specifically for automotive-grade ESD/surge protection where compact size, JEDEC qualification, and IEC61000-4-2 compliance are mandatory.
FAQ
Is SMF4L14CA-7 unidirectional or bidirectional?
SMF4L14CA-7 is a bi-directional TVS diode, indicated by the "C" suffix and absence of cathode band marking. It clamps transients equally in both polarities, making it suitable for AC-coupled lines, differential buses like RS-485, and floating sensor outputs without polarity concerns.
What is the maximum operating temperature for SMF4L14CA-7?
The SMF4L14CA-7 is rated for junction temperatures from –55°C to +175°C. Its thermal resistance junction-to-solder-point is 70°C/W, so sustained operation at +175°C requires proper PCB copper area (≥1"², 2 oz.) and derating per Figure 1 in DS43394 Rev. 3-2.
Does SMF4L14CA-7 meet AEC-Q200 requirements?
Yes - SMF4L14CA-7 is qualified to AEC-Q200 for passive components and manufactured in IATF 16949-certified facilities. It undergoes stress testing including temperature cycling, humidity bias, and surge endurance, as confirmed in Diodes' automotive product documentation.
How does SMF4L14CA-7 compare to SMAJ14CA in PCB layout?
SMF4L14CA-7 uses DO-219AA (2.8 × 1.9 mm), while SMAJ14CA uses DO-214AC (4.5 × 2.7 mm). The smaller footprint reduces board space by ~60%, but requires tighter pad geometry (0.85–1.15 mm lead width) and optimized thermal pad connection to maintain 400W pulse capability.
SMF4L14CA-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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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
SMF4L14CA-7 FAQ
1.How can I place an order for SMF4L14CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L14CA-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 SMF4L14CA-7 reliable?
The price and inventory of SMF4L14CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L14CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L14CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L14CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L14CA-7?
SMF4L14CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L14CA-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 SMF4L14CA-7?
For technical support, including SMF4L14CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L14CA-7 requirements.
6.How does Aetrix verify that SMF4L14CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L14CA-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 SMF4L14CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L14CA-7?
All SMF4L14CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L14CA-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 SMF4L14CA-7 part is unused and in its original packaging.
Return procedure for SMF4L14CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L14CA-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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