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Diodes Incorporated SMF4L14A-7
- Part No.:
- SMF4L14A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L14A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,977
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Product details
Overview
SMF4L14A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in DC power rails and signal 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 IEC61000-4-2 ±30kV ESD immunity - deployed in automotive battery interfaces and industrial power management systems.
For engineers reviewing the SMF4L14A-7 datasheet, SMF4L14A-7 pinout, SMF4L14A-7 application, or SMF4L14A-7 equivalent, this device is selected for its fast sub-1ns response time, low leakage (<0.5µA at VRWM), DO-219AA package footprint compatibility with high-density PCB layouts, and AEC-Q qualified variants for automotive-grade reliability assurance.
Technical Context
This TVS diode operates as a unidirectional clamp, conducting only during negative transients relative to its cathode-marked terminal. Its silicon avalanche structure delivers precise VBR tolerance (±5% typical), stable thermal performance up to +175°C junction temperature, and low dynamic impedance (calculated ~1.35Ω from VC–VBR/IPP).
The device uses a planar junction process optimized for repeatable surge handling under 10/1000µs waveform stress. Its DO-219AA package enables efficient heat dissipation via cathode tab soldering, with RθJC = 18°C/W and RθJS = 70°C/W to PCB, supporting sustained operation in thermally constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform); sustains single-event surges without degradation in power rail protection. |
| Working Peak Reverse Voltage | 14V; sets maximum continuous DC bias before leakage exceeds 0.5µA - matches 12V automotive systems. |
| Breakdown Voltage (Min) | 15.6V @ 1mA; ensures reliable triggering above normal operating voltage with margin against false conduction. |
| Clamping Voltage (Max) | 23.2V @ 17.2A; limits downstream IC voltage stress during 8/20µs surge events in battery line protection. |
| ESD Rating | ±30kV contact & air per IEC61000-4-2; eliminates need for secondary ESD components on exposed connectors. |
| Junction Temperature Range | −55°C to +175°C; supports under-hood automotive deployment and industrial ambient extremes. |
| Leakage Current | <0.5µA @ 14V; prevents measurable power loss in always-on battery-backed circuits. |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount molded plastic case (2.80mm × 1.90mm × 0.60mm), halogen-free, RoHS-compliant, with matte tin-plated copper alloy leads and cathode band marking for polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path during reverse-bias surge | Connected to protected line (e.g., 12V rail); conducts when voltage exceeds VBR. |
| Cathode | Reference terminal / clamping node | Connected to ground or lower-potential reference; defines clamping threshold and polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | <1.0ns turn-on time ensures suppression before sensitive ICs experience overvoltage damage. |
| High surge current capability | 17.2A peak pulse current (IPP) enables protection against ISO 7637-2 Load Dump pulses in automotive ECUs. |
| Low-profile packaging | DO-219AA footprint (2.8mm × 1.9mm) saves >40% board area vs. SMA packages while maintaining thermal performance. |
| Automotive-ready qualification | JEDEC-qualified for high-reliability applications; Q-suffix variants available for full AEC-Q101 compliance. |
| Green material composition | Halogen- and antimony-free molding compound (Br+Cl <1500ppm, Sb <1000ppm) meets automotive environmental mandates. |
Applications
| Automotive Battery Protection | Industrial Power Supply Input |
|---|---|
|
Use Scenario: 12V battery feed line in engine control units exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits voltage to ≤23.2V during 100V/50ms load dump events, preventing MOSFET gate oxide rupture and regulator latch-up. |
Use Scenario: Input stage of DIN-rail mounted 24V industrial PSU subjected to lightning-induced surges on AC/DC front-end. IC Role / Device Role / Timing Role: Primary surge suppression element ahead of bridge rectifier and bulk capacitor. Use Value: Absorbs 400W transient energy without failure, reducing need for upstream MOVs and simplifying Class II insulation design. |
| USB-C Port ESD Protection | Smart Meter Battery Backup Circuit |
|
Use Scenario: VBUS line protection in USB-C receptacles where hot-plug events induce ±15kV ESD strikes. IC Role / Device Role / Timing Role: First-line ESD clamp on 5V power rail feeding USB PD controller and port logic. Use Value: Clamps ESD pulses within 1ns to <12V, preserving USB-C PHY integrity without degrading signal integrity on CC/D+/D− lines. |
Use Scenario: Lithium coin-cell backup path in utility smart meters requiring decade-level data retention during main power outage. IC Role / Device Role / Timing Role: Reverse-polarity and surge protector on CR2032 anode connection to real-time clock IC. Use Value: Blocks reverse current flow while suppressing 30kV ESD events on exposed test points, eliminating risk of cell venting or RTC corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Same VRWM (14V) but SMA package (larger footprint, higher RθJA = 110°C/W) | Lower power density; unsuitable for space-constrained automotive modules | Select when legacy PCB layout prohibits DO-219AA rework and thermal derating is acceptable. |
| SMF4L14CA | Bi-directional variant; identical VRWM, VBR, VC, and IPP ratings | Protects AC-coupled or bidirectional signal lines (e.g., CAN bus, RS-485) | Choose for differential or symmetrical surge environments where polarity reversal must be suppressed. |
Compared with SMAJ14A and SMF4L14CA, SMF4L14A-7 offers superior board-area efficiency and thermal performance in unidirectional DC applications, while the bi-directional SMF4L14CA extends protection to AC signals without sacrificing clamping precision or surge rating.
Availability
SMF4L14A-7 is available at Aetrix Electronics and suitable for automotive battery protection, industrial power supply input stages, USB-C port ESD hardening, and smart meter backup circuitry requiring stable component supply across multi-year production cycles.
Supply support for SMF4L14A-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 North America.
This device belongs to Diodes' SMF4L series of high-power, low-profile TVS diodes engineered specifically for automotive and industrial transient suppression where space, reliability, and ESD robustness are critical.
FAQ
What is the polarity configuration of SMF4L14A-7?
SMF4L14A-7 is a unidirectional TVS diode, identified by a visible cathode band on the DO-219AA package. It conducts only when the anode is driven negative relative to the cathode, making it suitable for DC rail protection where polarity is fixed and reverse-voltage blocking is required.
Does SMF4L14A-7 meet AEC-Q101 requirements?
SMF4L14A-7 itself is not AEC-Q101 qualified; however, Diodes offers the automotive-grade SMF4L14AQ-7 variant, which undergoes full AEC-Q101 stress testing including HTGB, HTRB, and temperature cycling, and is manufactured in IATF 16949-certified facilities.
How does SMF4L14A-7 compare to SMAJ14A in thermal performance?
SMF4L14A-7 has RθJC = 18°C/W and RθJS = 70°C/W, enabling more efficient heat transfer to the PCB than SMAJ14A (RθJA = 110°C/W). This allows SMF4L14A-7 to sustain higher average surge repetition rates in thermally dense layouts without exceeding Tj(max) = +175°C.
Can SMF4L14A-7 be used in parallel for higher surge current handling?
No - paralleling TVS diodes is not recommended due to VBR mismatch causing current imbalance. For higher IPP, select a single device with matching VRWM but higher rating (e.g., SMF4L15A-7 offers 16.4A IPP) or use a TVS array with matched characteristics.
SMF4L14A-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L14A-7 FAQ
1.How can I place an order for SMF4L14A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L14A-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 SMF4L14A-7 reliable?
The price and inventory of SMF4L14A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L14A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L14A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L14A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L14A-7?
SMF4L14A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L14A-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 SMF4L14A-7?
For technical support, including SMF4L14A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L14A-7 requirements.
6.How does Aetrix verify that SMF4L14A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L14A-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 SMF4L14A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L14A-7?
All SMF4L14A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L14A-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 SMF4L14A-7 part is unused and in its original packaging.
Return procedure for SMF4L14A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L14A-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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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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