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Diodes Incorporated SMF4L15AQ-7
- Part No.:
- SMF4L15AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L15AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,941
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Product details
Overview
SMF4L15AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) with 15V working peak reverse voltage, 16.7–18.5V breakdown voltage range at 1mA, 24.4V maximum clamping voltage at 16.4A surge current, and AEC-Q101 qualification for automotive power line protection in battery management and ECU interfaces.
For engineers reviewing the SMF4L15AQ-7 datasheet, SMF4L15AQ-7 pinout, SMF4L15AQ-7 application, or SMF4L15AQ-7 equivalent, this device is selected for high-reliability DC power rail surge suppression where fast response (<1.0ns), low leakage (<0.5μA at 15V), and IATF 16949-manufactured consistency are required.
Technical Context
This TVS diode operates as a unidirectional clamping device in series with DC power inputs, triggering when reverse voltage exceeds its 16.7V minimum breakdown threshold to divert transients up to 400W (10/1000µs waveform) while limiting downstream voltage to ≤24.4V. Its DO-219AA package enables compact placement near connectors or fuse blocks.
It delivers ±30kV ESD immunity per IEC61000-4-2 (air/contact), supports continuous operation from –55°C to +175°C, and maintains <0.5μA reverse leakage at VRWM = 15V - critical for low-power always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform): sustains automotive load-dump and ISO 7637-2 pulse 5a surges without failure |
| Working Peak Reverse Voltage | 15V: matches 12V automotive system nominal rails with 25% margin for ripple and transients |
| Breakdown Voltage Range | 16.7–18.5V @ 1mA: ensures reliable turn-on before damage threshold of protected ICs (e.g., MCU power pins) |
| Maximum Clamping Voltage | 24.4V @ 16.4A: limits voltage seen by downstream components during worst-case surge events |
| Reverse Leakage Current | <0.5μA @ 15V: avoids battery drain in always-connected vehicle modules (e.g., telematics, ADAS sensors) |
| Response Time | <1.0ns (unidirectional): faster than typical microcontroller reset or watchdog timeout windows |
| AEC-Q101 Qualified | Validated for automotive use: includes temperature cycling, HTRB, and ESD stress per AEC standard |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount molded plastic case (2.80mm × 1.90mm × 0.60mm), halogen-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC input return path | Connected to ground or low-side reference; completes clamping path during overvoltage |
| Cathode (marked with band) | Protected line connection | Connected to 12V rail or signal line; conducts surge current to ground when VR > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse rating | Handles ISO 7637-2 Pulse 5a (load dump) without degradation in automotive power systems |
| ±30kV ESD protection | Meets IEC61000-4-2 Level 4 for direct contact discharge on exposed ports (e.g., OBD-II, USB-C) |
| Fast <1.0ns response | Clamps before transient energy couples into sensitive analog or digital circuitry |
| AEC-Q101 qualified & PPAP capable | Supports automotive production release with full change control and traceable manufacturing |
| DO-219AA footprint | Reduces PCB area by 40% vs. SMA packages while maintaining thermal performance via copper leadframe |
Applications
| Battery Management Systems (BMS) | Engine Control Units (ECU) |
|---|---|
|
Use Scenario: Protection of 12V supply input to lithium-ion BMS monitoring ICs against jump-start spikes and alternator load dump. IC Role / Device Role: Unidirectional clamping TVS placed between fuse and LDO input. Use Value: Limits voltage to ≤24.4V during 400W surges, preventing latch-up or gate oxide damage in precision analog front-ends. |
Use Scenario: Surge suppression on 12V power rail feeding microcontroller, CAN transceiver, and sensor interface circuits. IC Role / Device Role: Primary overvoltage clamp upstream of bulk capacitance and local regulators. Use Value: Maintains <0.5μA leakage to avoid parasitic drain on vehicle battery during extended key-off periods. |
| Telematics Control Units (TCU) | Advanced Driver Assistance Systems (ADAS) |
|
Use Scenario: Input protection for LTE/GNSS module power inputs exposed to external antenna/power cable coupling. IC Role / Device Role: First-line defense against induced transients from nearby ignition or RF sources. Use Value: Responds in <1.0ns to clamp sub-microsecond EFT bursts, preserving modem boot integrity and GPS lock stability. |
Use Scenario: Power rail protection for radar sensor SoCs operating in harsh under-hood environments. IC Role / Device Role: High-temp-rated TVS mounted adjacent to connector entry point on 77GHz radar PCB. Use Value: Rated for –55°C to +175°C operation, ensuring reliability across thermal cycling in engine bay deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same 15V VRWM, but SMA package (larger footprint, higher RθJA = 120°C/W) | Less suitable for space-constrained automotive modules requiring DO-219AA density | Select SMF4L15AQ-7 when board area is limited and thermal resistance must be minimized |
| TPSMD15A | Higher clamping voltage (27.7V @ 13.7A), lower peak power (300W), same DO-219AA package | Lower surge handling margin for ISO 7637-2 Pulse 5a compliance in 12V systems | Choose SMF4L15AQ-7 for full 400W capability and tighter clamping in safety-critical ECUs |
Compared with SMAJ15A and TPSMD15A, SMF4L15AQ-7 delivers superior power density (400W in DO-219AA), lower clamping voltage (24.4V vs. ≥27.7V), and guaranteed AEC-Q101 qualification - making it optimal for next-generation automotive electronics demanding compact, high-fidelity surge protection.
Availability
SMF4L15AQ-7 is available at Aetrix Electronics and suitable for automotive battery management, engine control units, telematics modules, and ADAS sensor power protection requiring stable component supply across multi-year vehicle production cycles.
Supply support for SMF4L15AQ-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 SMF4LxxAQ series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient suppression in 12V/24V automotive power networks with emphasis on small form factor and high surge endurance.
FAQ
What is the polarity configuration of SMF4L15AQ-7?
SMF4L15AQ-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only during reverse-biased overvoltage events, with anode tied to ground and cathode connected to the protected line - ideal for DC power rail clamping where forward conduction must be blocked.
Does SMF4L15AQ-7 meet automotive qualification standards?
Yes - SMF4L15AQ-7 is AEC-Q101 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC requirements, supporting full automotive production release.
How does the DO-219AA package improve thermal performance versus SMA?
The DO-219AA package uses a copper alloy leadframe with matte tin finish and optimized die attach, achieving RθJA = 96°C/W - 20% lower than SMAJ15A's 120°C/W. This allows higher sustained surge duty cycles and better reliability in thermally dense automotive PCB layouts.
Can SMF4L15AQ-7 replace older SMF15A devices?
No - SMF4L15AQ-7 is not a drop-in replacement for legacy SMF15A. It features enhanced surge rating (400W vs. 200W), tighter clamping (24.4V vs. ~27V), and AEC-Q101 qualification. Board layout must accommodate DO-219AA dimensions (2.80 × 1.90 mm), differing from SMA's 4.5 × 2.7 mm outline.
SMF4L15AQ-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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L15AQ-7 FAQ
1.How can I place an order for SMF4L15AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L15AQ-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 SMF4L15AQ-7 reliable?
The price and inventory of SMF4L15AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L15AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L15AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L15AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L15AQ-7?
SMF4L15AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L15AQ-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 SMF4L15AQ-7?
For technical support, including SMF4L15AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L15AQ-7 requirements.
6.How does Aetrix verify that SMF4L15AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L15AQ-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 SMF4L15AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L15AQ-7?
All SMF4L15AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L15AQ-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 SMF4L15AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L15AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L15AQ-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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