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Diodes Incorporated SMF4L14AQ-7
- Part No.:
- SMF4L14AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L14AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,046
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Product details
Overview
SMF4L14AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 14V working peak reverse voltage, 15.6V minimum breakdown voltage, and 23.2V maximum clamping voltage at 17.2A surge current. It provides ESD protection per IEC61000-4-2 (±30kV air/contact), features <1.0ns response time, and is AEC-Q101 qualified for automotive power line and battery contact protection.
For engineers reviewing the SMF4L14AQ-7 datasheet, SMF4L14AQ-7 pinout, SMF4L14AQ-7 application, or SMF4L14AQ-7 equivalent, this device is selected for robust overvoltage suppression in 12V automotive subsystems, battery management interfaces, and industrial DC power rails where fast clamping, low leakage (<0.5μA), and DO-219AA space efficiency are critical.
Technical Context
The SMF4L14AQ-7 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds 15.6V (min) and clamping to ≤23.2V at 17.2A (10/1000µs waveform). Its junction capacitance is not specified in the datasheet, but its sub-1ns response ensures effective suppression of EFT and ESD transients on low-voltage DC lines.
Designed for automotive-grade reliability, it delivers 400W peak pulse power dissipation, withstands 40A forward surge current (8.3ms half-sine), and maintains stable operation from –55°C to +175°C. The device uses a copper alloy leadframe with matte tin finish and is manufactured in IATF 16949-certified facilities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 14 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min) | 15.6 V - Minimum voltage at which avalanche breakdown initiates (1mA test current) |
| VC (max) | 23.2 V - Maximum clamped voltage seen by protected circuit during 17.2A transient |
| IPP (max) | 17.2 A - Peak pulse current capability under 10/1000µs waveform |
| IR @ VRWM | <0.5 µA - Reverse leakage ensures minimal standby power loss in battery-critical systems |
| PPK | 400 W - Peak pulse power handling defines transient energy absorption capacity |
| Response Time | <1.0 ns - Enables suppression of nanosecond-scale ESD events before downstream IC damage |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic package (2.80 mm × 1.90 mm × 0.60 mm), halogen- and antimony-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Cathode-band side reference | Connected to lower-potential node (e.g., ground or return path); polarity marking essential for unidirectional operation |
| Cathode | Reverse-biased terminal / Surge current sink | Connected to protected line (e.g., 12V rail); conducts transient energy to ground when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD stress per JEDEC standards |
| IEC61000-4-2 ESD rating | ±30kV air discharge and ±30kV contact discharge immunity enables direct interface with exposed connectors |
| DO-219AA footprint | Reduces PCB area by ~40% vs. SMA/SMB packages while maintaining thermal performance via copper leadframe |
| Fast response time | <1.0ns enables clamping before most microcontrollers or CAN transceivers experience latch-up or gate oxide damage |
| Low IR leakage | <0.5µA at 14V supports multi-year battery life in always-on automotive modules (e.g., telematics, body control units) |
Applications
| Automotive Power Distribution | Battery Management Systems |
|---|---|
Use Scenario: Protection of 12V supply lines feeding infotainment head units, ADAS cameras, and lighting controllers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused 12V rail and local DC-DC input, clamping surges within 1ns to prevent upstream regulator failure. Use Value: Withstands 40A 8.3ms surge and maintains <0.5µA leakage-critical for meeting ISO 16750-2 load dump and quiescent current requirements. | Use Scenario: Input protection for battery monitoring ICs (e.g., BQ769x0) connected directly to Li-ion or lead-acid cell stacks. IC Role / Device Role / Timing Role: TVS mounted at battery connector to shunt ESD and cable-disconnect spikes before reaching precision analog front-end. Use Value: 15.6V VBR aligns with 14V nominal battery systems; 23.2V VC ensures protected ICs remain below absolute maximum ratings during 17.2A transients. |
| Industrial Sensor Interfaces | USB-C Power Delivery Ports |
Use Scenario: Overvoltage protection on 24V fieldbus lines (e.g., RS-485, CAN FD) in factory automation equipment exposed to inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional-capable variant used (SMF4L14CAQ), but unidirectional SMF4L14AQ applied where ground-referenced signaling dominates. Use Value: Sub-1ns response prevents data corruption during fast-rising transients; DO-219AA allows placement adjacent to connector without sacrificing board real estate. | Use Scenario: Secondary-level surge protection on VBUS lines of USB-C receptacles in docking stations and portable monitors. IC Role / Device Role / Timing Role: TVS placed after primary EMI filter and before USB PD controller to absorb residual ESD and hot-plug spikes. Use Value: 400W PPK handles repeated ±30kV ESD strikes without degradation; RoHS/Green compliance meets EU and China regulatory mandates for consumer electronics. |
Availability
SMF4L14AQ-7 is available at Aetrix Electronics and suitable for automotive power distribution, battery management systems, industrial sensor interfaces, and USB-C power delivery ports requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMF4L14AQ-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMF4L series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for high-energy transient suppression in 12V–48V vehicle electrical systems while meeting stringent AEC-Q101 and IATF 16949 requirements.
FAQ
What is the polarity configuration of SMF4L14AQ-7?
The SMF4L14AQ-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only when the cathode is biased positively relative to the anode, making it suitable for DC rail protection where polarity is fixed and reverse conduction must be blocked.
How does SMF4L14AQ-7 differ from SMF4L14CAQ-7?
The SMF4L14AQ-7 is unidirectional with a cathode band marking, while SMF4L14CAQ-7 is bidirectional (no cathode band) and symmetrically clamps both positive and negative transients. Their VBR, VC, and IPP values are identical, but circuit placement and grounding strategy differ significantly between the two variants.
Is SMF4L14AQ-7 compatible with lead-free reflow processes?
Yes-SMF4L14AQ-7 features a matte tin finish on a copper alloy leadframe and is rated for standard lead-free reflow profiles (J-STD-020 Level 1). Its thermal resistance (RθJA = 96°C/W) and 175°C max junction temperature support reliable soldering on FR-4 PCBs with 2 oz. copper pads.
Does SMF4L14AQ-7 require derating at elevated ambient temperatures?
Yes-peak pulse power must be linearly derated above +25°C per Figure 1 in DS43393 Rev. 3-2. At +85°C ambient, PPK drops to approximately 280W (70% of 400W), and at +125°C, it falls to ~160W. Steady-state power dissipation is limited to 1.0W at +25°C and derates to zero at +150°C per Figure 3.
SMF4L14AQ-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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L14AQ-7 FAQ
1.How can I place an order for SMF4L14AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L14AQ-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 SMF4L14AQ-7 reliable?
The price and inventory of SMF4L14AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L14AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L14AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L14AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L14AQ-7?
SMF4L14AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L14AQ-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 SMF4L14AQ-7?
For technical support, including SMF4L14AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L14AQ-7 requirements.
6.How does Aetrix verify that SMF4L14AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L14AQ-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 SMF4L14AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L14AQ-7?
All SMF4L14AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L14AQ-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 SMF4L14AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L14AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L14AQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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