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Diodes Incorporated SMF4L15A-7
- Part No.:
- SMF4L15A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L15A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,144
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Product details
Overview
SMF4L15A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in power rails and I/O lines. It features a 15V working peak reverse voltage (VRWM), 16.7–18.5V breakdown voltage (VBR) at 1mA, clamps to ≤24.4V at 16.4A peak pulse current, and delivers ±30kV ESD immunity per IEC61000-4-2 - ideal for automotive battery contact and USB power interface protection.
For engineers reviewing the SMF4L15A-7 datasheet, SMF4L15A-7 pinout, SMF4L15A-7 application, or SMF4L15A-7 equivalent, this page provides verified package mapping (DO-219AA), confirmed unidirectional polarity marking (cathode band), clamping performance under 10/1000µs surge, thermal resistance (RθJA = 96°C/W), and direct alternatives with documented VBR and IRSM differences.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during transient events: it remains high-impedance below VRWM (15V), breaks down sharply within 1.0ns (unidirectional), and limits voltage to ≤24.4V while diverting up to 16.4A of 10/1000µs surge current. Its DO-219AA package enables low-inductance PCB layout critical for high-speed transients.
Thermal design is constrained by DC power dissipation (1.0W) and junction-to-ambient thermal resistance (96°C/W); operation is rated from –55°C to +175°C, supporting under-hood automotive environments. Polarity is unidirectional, marked by a cathode band on the top surface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15V - maximum continuous reverse operating voltage before clamping begins; sets safe operating margin for 12V automotive systems. |
| VBR (min/max) | 16.7V / 18.5V @ 1mA - tight breakdown window ensures predictable turn-on without premature conduction. |
| VC (max) | 24.4V @ 16.4A - clamping voltage under full 10/1000µs surge; defines worst-case rail overshoot during transient suppression. |
| PPK | 400W - peak pulse power handling capability per 10/1000µs waveform; validates robustness against ISO 7637-2 Pulse 1/2/5a surges. |
| IR (max) | 0.5µA @ 15V - ultra-low leakage preserves battery life in always-on automotive modules. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - qualifies for high-reliability human-interface and sensor port protection. |
| RθJA | 96°C/W - thermal resistance dictates required copper area (1"×1", 2 oz Cu) for sustained 1.0W DC dissipation. |
Pinout & Package
Package: DO-219AA - surface-mount, flat-lead, green molded plastic (UL 94V-0), 0.016g weight, moisture sensitivity level 1. Cathode band denotes unidirectional polarity; no band indicates bidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential node; forms current path during reverse-biased clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., battery rail); cathode band identifies this terminal visually on top surface. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Enables single-device protection against severe load-dump and inductive switching transients in 12V systems. |
| 1.0ns response time (unidirectional) | Ensures clamping activation before sensitive downstream ICs experience damaging overvoltage stress. |
| RoHS-compliant, halogen-free "Green" construction | Meets automotive environmental compliance requirements (J-STD-020 MSL1, AEC-Q200 alignment). |
| 0.5µA max reverse leakage @ VRWM | Minimizes standby current drain in battery-powered modules such as telematics and body control units. |
| DO-219AA low-profile footprint (2.80 × 1.90 mm) | Supports high-density PCB layouts while maintaining low parasitic inductance for effective high-frequency surge suppression. |
Applications
| Automotive Battery Protection | USB Power Input Protection |
|---|---|
|
Use Scenario: Protects 12V battery feed lines in ECUs, ADAS cameras, and infotainment head units from load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and ground; activates within 1.0ns to clamp transients above 15V. Use Value: Limits peak voltage to ≤24.4V during 16.4A surge, preventing damage to PMICs and microcontrollers without derating system voltage margins. |
Use Scenario: Safeguards USB Type-C VBUS input in automotive dongles and portable diagnostic tools against ESD and hot-plug transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line; blocks >15V faults while passing 5V/3A nominal power with <0.5µA leakage. Use Value: Delivers ±30kV IEC61000-4-2 ESD protection without compromising USB power delivery efficiency or signal integrity. |
| Industrial Sensor Interface | DC-DC Converter Input Stage |
|
Use Scenario: Shields analog sensor inputs (e.g., pressure, temperature) in factory automation PLCs from field-induced surges on 24V supply lines. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point; clamps induced spikes before reaching LDO or ADC front-end. Use Value: Maintains signal fidelity by limiting transient overshoot to 24.4V, avoiding latch-up or parametric drift in precision signal chains. |
Use Scenario: Protects buck converter input capacitors and MOSFET gates from voltage reversals and line surges in telecom power supplies. IC Role / Device Role / Timing Role: Primary-line TVS upstream of input filter; absorbs energy before it stresses bulk capacitance or controller ICs. Use Value: Handles 400W peak pulses without degradation, extending capacitor lifetime and eliminating need for redundant clamping stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same VRWM (15V) but lower PPK (400W vs. SMAJ's 400W), higher VC (24.4V vs. 24.4V), identical DO-214AC package. | Higher thermal resistance (RθJA ≈ 125°C/W) reduces sustained power handling on small pads. | Select SMF4L15A-7 for tighter board space and superior thermal performance in high-temperature ambient designs. |
| SMF4L15CA | Bidirectional variant: same VRWM (15V), VBR (16.7–18.5V), VC (24.4V), but double IR (1.0µA) and no cathode band marking. | Required where AC-coupled signals or bidirectional data lines (e.g., CAN, RS-485) need symmetrical clamping. | Choose SMF4L15A-7 only for DC rails with defined polarity; use SMF4L15CA when protecting differential or alternating-polarity interfaces. |
Compared with SMAJ15A, SMF4L15A-7 offers lower RθJA (96 vs. 125°C/W) and smaller DO-219AA footprint; versus SMF4L15CA, it provides half the leakage current and explicit unidirectional polarity identification - critical for deterministic fault-current paths in safety-critical 12V systems.
Availability
SMF4L15A-7 is available at Aetrix Electronics and suitable for automotive battery management, USB power interface protection, and industrial sensor interface applications requiring stable component supply across extended product lifecycles.
Supply support for SMF4L15A-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 and industrial markets.
The SMF4L series belongs to Diodes' high-power TVS portfolio engineered specifically for AEC-Q200-aligned automotive subsystems, emphasizing low-leakage, fast-response clamping in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMF4L15A-7 under a 10/1000µs surge?
The maximum clamping voltage (VC) is 24.4V at 16.4A peak pulse current, measured per the 10/1000µs standard 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 circuits during transient events.
Is SMF4L15A-7 suitable for automotive under-hood applications?
Yes - it is rated for –55°C to +175°C junction temperature, qualified to JEDEC reliability standards aligned with AEC-Q200, and packaged in a green, halogen-free DO-219AA case. Its 0.5µA leakage and 96°C/W RθJA support long-term operation in high-temperature engine bay environments.
How does the DO-219AA package compare to DO-214AC in thermal performance?
SMF4L15A-7 in DO-219AA achieves RθJA = 96°C/W on a 1"×1", 2 oz Cu pad, versus ~125°C/W for SMAJ15A in DO-214AC. The DO-219AA's shorter leadframe and optimized mold compound reduce thermal resistance by 23%, enabling higher sustained power handling in thermally constrained layouts.
Does SMF4L15A-7 meet IEC61000-4-2 ESD requirements?
Yes - it provides certified ±30kV air discharge and ±30kV contact discharge protection per IEC61000-4-2. This performance is intrinsic to its silicon structure and packaging, requiring no external circuitry, and is validated across production lots per Diodes' quality protocol.
SMF4L15A-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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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
SMF4L15A-7 FAQ
1.How can I place an order for SMF4L15A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L15A-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 SMF4L15A-7 reliable?
The price and inventory of SMF4L15A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L15A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L15A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L15A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L15A-7?
SMF4L15A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L15A-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 SMF4L15A-7?
For technical support, including SMF4L15A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L15A-7 requirements.
6.How does Aetrix verify that SMF4L15A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L15A-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 SMF4L15A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L15A-7?
All SMF4L15A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L15A-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 SMF4L15A-7 part is unused and in its original packaging.
Return procedure for SMF4L15A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L15A-7 Tags
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