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Diodes Incorporated SMF4L15CAQ-7
- Part No.:
- SMF4L15CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L15CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,342
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Product details
Overview
SMF4L15CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for automotive-grade overvoltage protection. It features a 15 V working peak reverse voltage (VRWM), 16.7–18.5 V breakdown voltage (VBR), 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power dissipation (10/1000 µs waveform). It is AEC-Q101 qualified and used in battery contact and power management circuits.
For engineers reviewing the SMF4L15CAQ-7 datasheet, SMF4L15CAQ-7 pinout, SMF4L15CAQ-7 application, or SMF4L15CAQ-7 equivalent, key selection criteria include clamping performance under IEC 61000-4-2 ±30 kV ESD stress, bi-directional surge handling capability, thermal resistance (RθJA = 96 °C/W), and compliance with automotive PPAP and IATF 16949 manufacturing requirements.
Technical Context
This bi-directional TVS operates symmetrically across both polarities to clamp transient surges on signal or power lines without polarity dependence. Its low clamping ratio (VC/VRWM ≈ 1.63) and sub-5 ns response time ensure fast suppression of ESD and lightning-induced transients before downstream ICs are damaged.
The device leverages planar junction technology in a molded green plastic DO-219AA package with matte tin-plated copper alloy leads. Thermal design is supported by RθJC = 18 °C/W and RθJS = 70 °C/W, enabling reliable operation up to +175 °C junction temperature in compact automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; defines safe standoff for 12 V automotive systems. |
| VBR (min/max) | 16.7 V / 18.5 V - Measured at 1 mA; ensures predictable turn-on threshold with ≤10.8% tolerance for robust design margin. |
| VC @ IPP | 24.4 V @ 16.4 A - Clamping voltage during 10/1000 µs surge; limits stress on protected 15 V-rated circuitry. |
| PPK | 400 W - Peak pulse power rating; supports high-energy transients per ISO 7637-2 Pulse 1/2/5a in automotive environments. |
| IR @ VRWM | 0.5 µA - Reverse leakage at 15 V; negligible power loss and minimal impact on battery drain in always-on modules. |
| ESD Rating | ±30 kV (air/contact) per IEC 61000-4-2 - Full system-level ESD immunity without external shielding or filtering. |
| TJ Range | −55 °C to +175 °C - Enables deployment in engine bay, battery management, and ADAS sensor modules. |
Pinout & Package
Package: DO-219AA - surface-mount, flat lead, bi-directional configuration with no cathode band marking; dimensions: 1.90 mm × 2.80 mm × 0.60 mm (L × W × H); weight: 0.016 g; RoHS-compliant, halogen-free green molding compound (UL 94V-0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional transient conduction path | No polarity sensitivity - connects across any two-point node (e.g., CAN_H/CAN_L, USB D+/D−, battery terminals) without orientation check. |
| Case / Mold Compound | Thermal and mechanical interface | Provides RθJC = 18 °C/W path to PCB copper; requires 2 oz. FR-4 pad layout per datasheet for rated power derating. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and ESD robustness - enables direct integration into PPAP-controlled BOMs. |
| Bi-directional clamping | Single-device protection for AC-coupled or differential lines (e.g., LIN, CAN, USB) without polarity constraints or dual-diode arrangements. |
| Low clamping ratio (VC/VRWM) | 1.63 - Minimizes overvoltage overshoot during surge events, preserving margin for 15 V logic and analog ICs downstream. |
| Fast response time | <5 ns - Activates before most microcontroller I/O pins can be damaged by ESD or load dump transients. |
| Green packaging | Halogen- and antimony-free (Br+Cl <1500 ppm, Sb <1000 ppm) - meets global environmental compliance mandates without sacrificing surge performance. |
Applications
| Battery Management Systems | Automotive LIN Bus Nodes |
|---|---|
Use Scenario: Protection of 12 V battery input terminals against load dump and jump-start transients. IC Role / Device Role: Primary clamping element placed directly at connector entry point before DC-DC converter input. Use Value: Withstands 400 W surges and clamps to 24.4 V, preventing damage to upstream PMICs and ensuring system reset recovery after ISO 7637-2 Pulse 5a events. |
Use Scenario: ESD and noise suppression on LIN physical layer wiring in door modules and seat controllers. IC Role / Device Role: Bi-directional TVS bridging LIN bus pair (LIN_H/L) to ground. Use Value: ±30 kV IEC 61000-4-2 immunity and sub-5 ns response prevent communication lockup during factory handling or field service. |
| Infotainment USB Interfaces | ADAS Camera Power Rails |
Use Scenario: Surge protection on USB 2.0 data lines (D+/D−) in head unit and display modules. IC Role / Device Role: Low-capacitance bi-directional TVS placed inline with differential pair. Use Value: Clamps transients without distorting 480 Mbps signaling integrity; VRWM = 15 V avoids interference with VBUS detection logic. |
Use Scenario: Input rail protection for 12 V camera modules exposed to engine bay EMI and ignition noise. IC Role / Device Role: Standoff protection on main power input before LDO regulator. Use Value: 175 °C max junction temperature and AEC-Q101 qualification ensure reliability in high-ambient under-hood deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CA | DO-214AC package; higher RθJA (110 °C/W); same VRWM/VBR/VC ratings. | Larger footprint (4.5 × 2.7 mm vs. 1.9 × 2.8 mm); less suitable for space-constrained ADAS modules. | Preferred where legacy board space allows and cost sensitivity outweighs size/thermal advantages. |
| TPSMD15CA | DO-214AB package; 600 W PPK; slightly higher VC (25.5 V @ 15.5 A); same AEC-Q101 grade. | Higher surge capacity but larger body (7.1 × 6.2 mm); may require PCB redesign. | Chosen when system-level testing demands >400 W margin, such as heavy-duty commercial vehicle power nets. |
Compared with SMAJ15CA and TPSMD15CA, SMF4L15CAQ-7 delivers optimal balance of miniaturization (DO-219AA), thermal efficiency (RθJA = 96 °C/W), and automotive qualification - making it the preferred choice for next-gen compact, high-temperature automotive electronics.
Availability
SMF4L15CAQ-7 is available at Aetrix Electronics and suitable for automotive battery management, LIN bus nodes, infotainment USB interfaces, and ADAS camera power rails requiring stable component supply across long production lifecycles.
Supply support for SMF4L15CAQ-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 ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive power line and data bus protection with emphasis on miniaturization, ESD hardness, and thermal resilience.
FAQ
Is SMF4L15CAQ-7 unidirectional or bidirectional?
SMF4L15CAQ-7 is a bi-directional TVS diode, indicated by the "C" in its part number and absence of cathode band marking. It provides symmetrical clamping for both positive and negative transients, making it ideal for differential buses like LIN and USB without polarity concerns.
What is the maximum operating temperature for SMF4L15CAQ-7?
The SMF4L15CAQ-7 has an operating junction temperature range of −55 °C to +175 °C. This rating is validated per AEC-Q101 stress tests and supports deployment in under-hood automotive locations, including battery junction boxes and radar modules.
Does SMF4L15CAQ-7 meet IEC 61000-4-2 ESD requirements?
Yes - SMF4L15CAQ-7 provides ±30 kV air discharge and ±30 kV contact discharge protection per IEC 61000-4-2. This performance is measured and guaranteed across its full temperature range and is integral to its AEC-Q101 qualification.
How does the DO-219AA package improve thermal performance over DO-214AC?
The DO-219AA package achieves RθJA = 96 °C/W versus ~110 °C/W for DO-214AC due to its lower profile, optimized copper leadframe, and enhanced thermal path to the PCB. This allows higher sustained surge duty cycles in thermally dense automotive PCBs without derating.
SMF4L15CAQ-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):
- 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
SMF4L15CAQ-7 FAQ
1.How can I place an order for SMF4L15CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L15CAQ-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 SMF4L15CAQ-7 reliable?
The price and inventory of SMF4L15CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L15CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L15CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L15CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L15CAQ-7?
SMF4L15CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L15CAQ-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 SMF4L15CAQ-7?
For technical support, including SMF4L15CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L15CAQ-7 requirements.
6.How does Aetrix verify that SMF4L15CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L15CAQ-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 SMF4L15CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L15CAQ-7?
All SMF4L15CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L15CAQ-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 SMF4L15CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L15CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L15CAQ-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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