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Diodes Incorporated SMF4L6.5CAQ-7
- Part No.:
- SMF4L6.5CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L6.5CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
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Product details
Overview
SMF4L6.5CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for automotive-grade ESD and surge protection on low-voltage signal and power lines. It features 6.5V working peak reverse voltage (VRWM), 7.22–7.98V breakdown voltage (VBR), 11.2A maximum reverse surge current (IRSM), 500μA max reverse leakage at VRWM, and clamps to ≤11.2V under 35.7A peak pulse current. It is deployed in battery contact protection and CAN/LIN bus interfaces.
For engineers reviewing the SMF4L6.5CAQ-7 datasheet, SMF4L6.5CAQ-7 pinout, SMF4L6.5CAQ-7 application, or SMF4L6.5CAQ-7 equivalent, key selection criteria include clamping voltage vs. protected IC VDD tolerance, AEC-Q101 qualification status, IEC61000-4-2 ±30kV ESD rating, and DO-219AA thermal performance in high-density automotive PCB layouts.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or floating signal lines without polarity dependency. Its sub-5ns response time ensures suppression before sensitive downstream circuitry experiences overvoltage stress, and its 400W peak pulse power rating (10/1000µs waveform) supports ISO 16750-2 load dump and ISO 7637-2 pulse 1/2/3a immunity requirements.
The device exhibits 1.0W DC power dissipation capability on standard FR-4 PCBs, with junction-to-ambient thermal resistance of 96°C/W - critical for sustained transient events in engine control units and body electronics modules where ambient temperatures exceed +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 6.5V - Maximum continuous reverse voltage before significant leakage; sets upper limit for protected line operating voltage. |
| VBR (min/max) | 7.22V / 7.98V - Breakdown occurs within this range at 10mA test current; defines turn-on threshold consistency. |
| VC (max) | 11.2V - Clamping voltage at 35.7A peak pulse; must remain below absolute maximum rating of protected IC. |
| IPP (max) | 35.7A - Peak pulse current supported at VC; determines survivability against ISO 7637-2 Pulse 1 (inductive switch-off). |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - Enables single-device compliance for automotive infotainment and sensor interface ports. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and mechanical shock per AEC stress test plan. |
| Package | DO-219AA - Surface-mount, low-profile (0.81–1.20mm height), 0.016g weight; optimized for automated placement and high thermal conductivity via cathode tab. |
Pinout & Package
DO-219AA package features two terminals: anode and cathode, with no polarity marking for bi-directional configuration. The cathode band is omitted per marking convention in the SMF4L6.5CAQ series, confirming symmetrical bidirectional operation. Thermal path is optimized through the cathode tab to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during negative transients | Connects to protected line; forms low-impedance shunt path to ground when voltage exceeds -VC. |
| Cathode | Current entry point during positive transients | Typically tied to system ground plane; provides primary thermal conduction path to PCB for pulse energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Supports repeated surge events in 12V automotive systems without degradation, meeting ISO 16750-2 Class III/IV requirements. |
| AEC-Q101 qualified & PPAP capable | Enables direct integration into Tier-1 automotive BOMs with full change control, traceability, and IATF 16949 manufacturing assurance. |
| Bi-directional clamping symmetry | Equal VC = 11.2V for ±35.7A pulses ensures balanced protection of differential buses like LIN or RS-485 without polarity concerns. |
| Green, halogen-free, RoHS-compliant | Meets EU Directive 2015/863/EU with Br+Cl <1500ppm and Sb <1000ppm - required for global OEM environmental compliance programs. |
| Fast response time (<5.0ns) | Activates before most microcontroller I/O pins reach destructive voltage levels during ESD events, reducing need for additional filtering. |
Applications
| Automotive Battery Interface | CAN Bus Protection |
|---|---|
|
Use Scenario: Protection of 12V battery feed lines entering ECUs, where load dump and jump-start surges occur. IC Role / Device Role / Timing Role: Primary shunt clamp absorbing up to 400W transient energy while holding line voltage ≤11.2V. Use Value: Prevents latch-up or gate oxide damage in PMICs and MCU power inputs without requiring series impedance or derating. |
Use Scenario: ESD and surge protection on CAN_H/CAN_L differential pair in body control modules. IC Role / Device Role / Timing Role: Bi-directional TVS placed across differential pair to clamp common-mode transients while preserving signal integrity. Use Value: Maintains CAN bit timing by limiting voltage excursion to <11.2V, avoiding recessive-to-dominant corruption during ±30kV ESD events. |
| LIN Transceiver Port | Infotainment USB Power Line |
|
Use Scenario: Protection of single-wire LIN bus against battery reversal and alternator noise coupling. IC Role / Device Role / Timing Role: Bidirectional clamp referenced to ground, suppressing both positive and negative spikes on the LIN line. Use Value: Ensures LIN transceiver remains functional after 35.7A surge events, eliminating need for redundant protection schemes. |
Use Scenario: Input protection for USB Type-C VBUS lines in automotive head units exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: First-line defense against ±30kV contact ESD and 100ns fast-rising transients on 5V supply rail. Use Value: Clamps VBUS to 11.2V within 5ns, preventing overvoltage shutdown of USB PD controllers and maintaining enumeration reliability. |
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 |
|---|---|---|---|
| SMAJ6.5CA | DO-214AC package; 600W rating; higher VC = 11.5V at 38.2A; slower thermal response due to larger junction-to-ambient RθJA (110°C/W). | Less suitable for space-constrained automotive modules; requires larger pad layout and greater board area. | Prefer SMF4L6.5CAQ-7 where PCB real estate and thermal mass are limited, e.g., in compact ADAS camera modules. |
| TPSMF6.5CA | Same DO-219AA package; 600W rating; lower VC = 10.5V at 38.2A; tighter VBR tolerance (7.22–7.67V); higher IR leakage (1000μA). | Better clamping margin for 3.3V/5V logic rails but higher steady-state leakage may affect ultra-low-power sleep modes. | Choose TPSMF6.5CA where clamping voltage margin is critical and leakage is not constrained by system sleep budget. |
Compared with SMAJ6.5CA and TPSMF6.5CA, SMF4L6.5CAQ-7 delivers optimal balance of compact DO-219AA footprint, AEC-Q101 compliance, and 11.2V clamping at 35.7A - making it the preferred choice for next-generation automotive domain controllers where size, qualification, and predictable voltage limiting are jointly prioritized.
Availability
SMF4L6.5CAQ-7 is available at Aetrix Electronics and suitable for automotive battery management, CAN/LIN bus protection, infotainment power input, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMF4L6.5CAQ-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 components for automotive, industrial, and computing markets with IATF 16949-certified facilities.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive subsystems demanding robust ESD immunity, compact packaging, and guaranteed parametric stability over -55°C to +175°C.
FAQ
What is the difference between SMF4L6.5AQ and SMF4L6.5CAQ-7?
SMF4L6.5AQ is unidirectional (cathode-banded), while SMF4L6.5CAQ-7 is bidirectional (no cathode band), enabling symmetric protection of AC or floating lines. Both share identical VRWM (6.5V), VBR (7.22–7.98V), and VC (11.2V), but differ in polarity marking and application scope - the 'C' suffix explicitly denotes bi-directionality per Diodes' ordering nomenclature.
Does SMF4L6.5CAQ-7 meet automotive ESD requirements beyond IEC61000-4-2?
Yes - it satisfies AEC-Q101 stress tests including HTGB (high-temperature gate bias), H3TRB (highly accelerated temperature-humidity bias), and temperature cycling (-55°C to +175°C). Its ±30kV IEC61000-4-2 rating covers system-level ESD, and its 400W pulse rating aligns with ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (battery disconnect) waveforms.
Can SMF4L6.5CAQ-7 be used in 24V commercial vehicle systems?
No - its 6.5V VRWM and 11.2V VC are designed for 12V nominal systems. For 24V applications, Diodes recommends SMF4L24CAQ-7 (VRWM = 24V, VC = 38.9V) or SMF4L36CAQ-7 (VRWM = 36V, VC = 58.1V), which maintain appropriate voltage margins above system operating rails and load dump peaks.
How does the DO-219AA package improve thermal performance over SMA (DO-214AC)?
DO-219AA's low-profile design (max 1.20mm height) and exposed cathode tab provide lower junction-to-board thermal resistance (RθJB ≈ 14°C/W vs. ~25°C/W for SMA), enabling faster heat dissipation during repetitive transients. Its 0.016g mass also reduces thermal inertia, improving pulse-to-pulse recovery in high-frequency surge environments like motor drive feedback lines.
SMF4L6.5CAQ-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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 35.7A
- 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
SMF4L6.5CAQ-7 FAQ
1.How can I place an order for SMF4L6.5CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L6.5CAQ-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 SMF4L6.5CAQ-7 reliable?
The price and inventory of SMF4L6.5CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L6.5CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L6.5CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L6.5CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L6.5CAQ-7?
SMF4L6.5CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L6.5CAQ-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 SMF4L6.5CAQ-7?
For technical support, including SMF4L6.5CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L6.5CAQ-7 requirements.
6.How does Aetrix verify that SMF4L6.5CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L6.5CAQ-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 SMF4L6.5CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L6.5CAQ-7?
All SMF4L6.5CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L6.5CAQ-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 SMF4L6.5CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L6.5CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L6.5CAQ-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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Diodes Incorporated
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