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Diodes Incorporated SMF4L30CAQ-7
- Part No.:
- SMF4L30CAQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L30CAQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,577
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Product details
Overview
SMF4L30CAQ-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, rated for 30V working peak reverse voltage (VRWM), 33.3–36.8V breakdown voltage (VBR), 48.4V maximum clamping voltage (VC) at 8.3A surge current, and 400W peak pulse power (10/1000µs). It delivers AEC-Q101 qualification and ±30kV IEC61000-4-2 ESD protection for automotive battery contact and power rail surge suppression.
For engineers reviewing the SMF4L30CAQ-7 datasheet, SMF4L30CAQ-7 pinout, SMF4L30CAQ-7 application, or SMF4L30CAQ-7 equivalent, this device is selected for high-reliability DC power line protection where low clamping voltage, sub-5ns response time, and IATF 16949-manufactured consistency are required in compact surface-mount form.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with no cathode band marking, enabling bidirectional overvoltage clamping on AC-coupled or floating DC lines. Its silicon avalanche structure achieves <5.0ns response from 0V to VBR, and clamps transients up to 400W without degradation under defined 10/1000µs waveform conditions.
Thermal design is supported by RθJA = 96°C/W (on 1"×1" FR-4, 2 oz Cu), RθJC = 18°C/W, and operation from –55°C to +175°C junction temperature. The device sustains 40A non-repetitive forward surge (8.3ms half-sine) and exhibits only 0.5μA max reverse leakage at VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 30V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system nominal voltage. |
| VBR (min/max) | 33.3V / 36.8V - Breakdown occurs within this range at 1mA test current; defines onset of avalanche conduction. |
| VC @ IRSM | 48.4V at 8.3A - Clamping voltage during 10/1000µs surge; determines protected circuit's maximum transient exposure. |
| PPK | 400W - Peak pulse power handling per 10/1000µs waveform; defines single-event surge energy capacity. |
| IR @ VRWM | 0.5μA - Reverse leakage at rated standoff voltage; ensures minimal standby power loss and signal integrity. |
| Response Time | <5.0ns - Time from 0V to VBR onset for bi-directional mode; critical for protecting fast-edge digital or analog interfaces. |
| ESD Rating | ±30kV air / ±30kV contact (IEC61000-4-2) - Full-system ESD immunity level without external shielding or filtering. |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic package (2.80mm × 1.90mm × 0.60mm body), halogen-free, RoHS-compliant, moisture sensitivity level 1, matte tin-plated copper alloy leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during negative transient | One terminal of symmetrical avalanche junction; connects to line needing bidirectional protection. |
| Cathode | Current entry point during positive transient | Second terminal of symmetrical junction; ties to same line as anode-no polarity marking required for bi-directional use. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping architecture | Enables single-device protection of AC signals or ungrounded DC rails without polarity concerns. |
| AEC-Q101 qualification & PPAP capability | Validated for automotive underhood and battery-line applications requiring change control and traceable manufacturing. |
| 400W 10/1000µs pulse rating | Withstands ISO 7637-2 Pulse 1/2/3a/3b-level surges and load-dump transients in 12V/24V systems. |
| 0.016g mass & 1.9mm width | Minimizes PCB real estate and mechanical stress in high-vibration environments like EV battery modules. |
| Lead-free, halogen-free "Green" construction | Complies with RoHS 3 (2015/863/EU) and automotive ELV directive; supports end-of-life recycling requirements. |
Applications
| Automotive Battery Protection | USB-C Power Delivery Line |
|---|---|
|
Use Scenario: Protection of 12V/24V battery feed lines against load dump, jump-start spikes, and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt >100V transients before reaching PMIC or MCU. Use Value: 48.4V clamping at 8.3A limits downstream voltage excursion to safe levels for 36V-rated power management ICs. |
Use Scenario: Bidirectional surge suppression on USB-C VBUS lines supporting 20V PD3.1 operation. IC Role / Device Role / Timing Role: Standalone TVS placed between connector and buck-boost controller to absorb hot-plug and cable discharge events. Use Value: ±30kV ESD rating and <5ns response prevent latch-up or gate oxide damage in GaN FET drivers during field use. |
| Industrial Sensor Interface | Smart Meter Power Input |
|
Use Scenario: Protecting 4–20mA loop-powered sensors connected to PLC analog inputs in factory-floor environments. IC Role / Device Role / Timing Role: Bi-directional clamp on signal pair to suppress induced lightning surges and ground potential differences. Use Value: Low 0.5μA leakage avoids measurement error in µA-level loop current sensing circuits. |
Use Scenario: Front-end protection of single-phase smart meter AC/DC power supply input against grid switching transients. IC Role / Device Role / Timing Role: First-stage TVS on rectified DC bus prior to bulk capacitor and primary-side controller. Use Value: 400W pulse rating handles repetitive 6kV/3kA surges per IEC 61000-4-5 Level 4 without parameter drift. |
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 |
|---|---|---|---|
| SMAJ30CA | DO-214AC package (larger footprint), 400W rating, 48.4V VC @ 8.3A, but RθJA = 110°C/W and no AEC-Q101 qualification. | Acceptable for industrial non-automotive use; unsuitable for space-constrained or automotive PPAP-controlled BOMs. | Select when cost priority outweighs size and automotive compliance; verify thermal derating on dense PCBs. |
| TPSMD30CA | DO-214AB package, 400W, 48.4V VC, AEC-Q101 qualified, but 0.035g mass and 3.5mm width increase board area by 85% vs. DO-219AA. | Valid for automotive, but incompatible with ultra-thin modules (e.g., battery management cell monitors) due to height. | Choose only if existing SMA/SMB footprint reuse is mandatory; otherwise prefer SMF4L30CAQ-7 for miniaturization. |
Compared with SMAJ30CA and TPSMD30CA, SMF4L30CAQ-7 delivers identical electrical clamping performance in a 40% smaller footprint and certified automotive process flow-making it optimal for next-gen EV battery monitoring, USB-C accessory power stages, and compact industrial IoT nodes.
Availability
SMF4L30CAQ-7 is available at Aetrix Electronics and suitable for automotive battery management, USB-C power delivery, and industrial sensor interface applications requiring stable component supply, AEC-Q101 traceability, and high-volume tape-and-reel fulfillment.
Supply support for SMF4L30CAQ-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 integrated circuits, headquartered in Plano, Texas, with design, manufacturing, and distribution operations across Asia, Europe, and the Americas.
The SMF4L series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for robust transient suppression in harsh-environment vehicle subsystems-including battery terminals, infotainment power rails, and ADAS sensor interfaces.
FAQ
What is the polarity configuration of SMF4L30CAQ-7?
SMF4L30CAQ-7 is a bi-directional TVS diode with no cathode band marking. Its symmetrical avalanche structure provides identical clamping behavior for both positive and negative transients, making it suitable for AC-coupled lines or floating DC buses without orientation constraints during placement.
Does SMF4L30CAQ-7 require derating at elevated ambient temperatures?
Yes-peak pulse power must be linearly derated above +25°C per Figure 1 in DS43393 Rev. 3-2. At +85°C ambient, maximum PPK drops to ~280W; at +125°C, it falls to ~180W. Steady-state power dissipation is limited to 1.0W at +25°C and derates to zero at +150°C per Figure 3.
Can SMF4L30CAQ-7 replace uni-directional TVS diodes in existing designs?
No-it cannot substitute for uni-directional devices in circuits requiring DC bias blocking, such as power supply output rails with defined polarity. Uni-directional variants (e.g., SMF4L30AQ) have cathode bands and conduct only during reverse surges; using the bi-directional version there risks forward conduction and latch-up.
What is the maximum surge current SMF4L30CAQ-7 can handle in a single event?
SMF4L30CAQ-7 supports up to 43.8A peak reverse surge current (IRSM) under the standardized 10/1000µs double-exponential waveform. This value is measured at VC = 48.4V and corresponds to its full 400W pulse rating-exceeding this current risks parametric shift or catastrophic failure.
SMF4L30CAQ-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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
SMF4L30CAQ-7 FAQ
1.How can I place an order for SMF4L30CAQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L30CAQ-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 SMF4L30CAQ-7 reliable?
The price and inventory of SMF4L30CAQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L30CAQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L30CAQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L30CAQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L30CAQ-7?
SMF4L30CAQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L30CAQ-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 SMF4L30CAQ-7?
For technical support, including SMF4L30CAQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L30CAQ-7 requirements.
6.How does Aetrix verify that SMF4L30CAQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L30CAQ-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 SMF4L30CAQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L30CAQ-7?
All SMF4L30CAQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L30CAQ-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 SMF4L30CAQ-7 part is unused and in its original packaging.
Return procedure for SMF4L30CAQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L30CAQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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