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Diodes Incorporated SMF4L75CA-7
- Part No.:
- SMF4L75CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L75CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,637
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Product details
Overview
SMF4L75CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 75V working peak reverse voltage (VRWM), 83.3V minimum breakdown voltage (VBR), 121A maximum peak pulse current (IRSM), and clamps to ≤121V at 3.3A. It is used in automotive battery interfaces and industrial I/O protection.
For engineers reviewing the SMF4L75CA-7 datasheet, SMF4L75CA-7 pinout, SMF4L75CA-7 application, or SMF4L75CA-7 equivalent, this page delivers verified electrical parameters, DO-219AA terminal mapping, real-world clamping performance data, and validated alternatives for 75V bi-directional TVS selection in AEC-Q-compliant designs.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with no cathode band marking per mechanical drawing. Its silicon avalanche structure enables sub-nanosecond response to transients, clamping within 5ns from 0V to VBR min under 10/1000µs waveform stress.
It delivers 400W peak pulse power dissipation (10/1000µs), supports ±30kV IEC61000-4-2 ESD immunity, and maintains <0.5µA reverse leakage at VRWM - critical for low-power sensor and CAN bus node protection where standby current integrity matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 75V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR (min) | 83.3V @ 1mA - Minimum voltage at which avalanche breakdown begins; defines turn-on threshold. |
| VC (max) | 121V @ 3.3A - Maximum clamped voltage during 10/1000µs surge; determines protected circuit's peak stress. |
| PPK | 400W - Peak pulse power handling capability under standard 10/1000µs waveform. |
| IR (max) | 0.5µA @ 75V - Reverse leakage current at rated VRWM; ensures minimal standby power loss. |
| ESD Rating | ±30kV air / ±30kV contact - Complies with IEC61000-4-2 Level 4, enabling robust front-end protection. |
| Package | DO-219AA - Surface-mount, 2-pin, ultra-compact (2.8 × 1.9 × 0.6 mm), RoHS/halogen-free "Green" molding compound. |
Pinout & Package
DO-219AA is a symmetrical, bi-directional surface-mount package with two identical terminals; no polarity marking required. The device has no anode/cathode distinction - both terminals function identically under reverse or forward transient stress.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bi-directional Surge Path | Connects to protected line (e.g., CAN_H or battery rail); conducts transient energy to ground in either polarity. |
| Terminal 2 | Bi-directional Surge Path | Connects to reference plane (e.g., chassis ground or system GND); completes low-inductance clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables protection against ISO 7637-2 Pulse 1/2a/3a surges and IEC 61000-4-5 Level 3 (1kV/2Ω) on 12V systems. |
| Sub-5ns Response Time | Clamps transients before sensitive downstream ICs (e.g., CAN transceivers, microcontrollers) experience overvoltage damage. |
| ±30kV ESD Robustness | Eliminates need for additional ESD diodes in USB, LIN, or sensor interface ports meeting automotive EMC requirements. |
| DO-219AA Footprint | Reduces PCB area by >40% vs. SMA/SMB packages while maintaining thermal performance via low RθJC (18°C/W). |
| AEC-Q200 Qualified Option | Q-suffix variants (e.g., SMF4L75CAQ-7) are available for automotive applications requiring PPAP and IATF 16949 traceability. |
Applications
| Automotive Battery Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12V battery feed lines in ADAS ECUs against load dump and jump-start surges. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between battery input and DC-DC converter input stage. Use Value: Limits voltage to ≤121V during 10/1000µs 30A surge, preventing MOSFET gate oxide failure and regulator latch-up. | Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TCAN1042) from ESD and coupled noise on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance (<50pF typical) TVS placed differential across CAN_H/CAN_L lines near connector. Use Value: Clamps ±30kV ESD events without distorting 5Mbps CAN FD signal integrity due to fast response and symmetric clamping. |
| Industrial Sensor Interface | Smart Meter Power Input |
Use Scenario: Shielding 4–20mA analog sensor inputs in PLC modules from field-induced surges and lightning-induced transients. IC Role / Device Role / Timing Role: Bi-directional TVS connected between signal line and local AGND, upstream of precision op-amp input stage. Use Value: Maintains <0.5µA leakage at 24V supply, avoiding offset error in µV-level measurement circuits. | Use Scenario: Securing AC/DC auxiliary power input (e.g., 75V DC derived from rectified mains) in utility smart meters against grid switching surges. IC Role / Device Role / Timing Role: Primary surge clamp on bulk DC rail feeding meter SoC and RTC backup circuitry. Use Value: Withstands repeated 400W pulses without degradation, ensuring >10-year field reliability under IEC 61000-4-5 Class 3 stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75CA-TP | Same VRWM (75V), higher VC (123V), SMA package (larger footprint, higher RθJA = 125°C/W) | Less suitable for space-constrained automotive modules; lower thermal efficiency on dense PCBs | Prefer SMF4L75CA-7 when board area < 3mm² is allocated and junction temperature rise must stay <25°C under 1Hz surge duty. |
| 1.5KE75CA | Higher PPK (1500W), DO-204AC package, slower response (>10ns), higher IR (5µA) | Used in legacy industrial power supplies; not compliant with modern ESD or automotive footprint requirements | Choose SMF4L75CA-7 for new designs targeting AEC-Q200, IEC61000-4-2 Level 4, and DO-219AA assembly compatibility. |
Compared with SMAJ75CA-TP and 1.5KE75CA, SMF4L75CA-7 delivers superior space efficiency, lower thermal resistance, tighter clamping (121V vs. 123V/135V), and guaranteed ±30kV ESD performance - making it optimal for next-gen automotive and compact industrial electronics where layout density and EMC compliance are critical.
Availability
SMF4L75CA-7 is available at Aetrix Electronics and suitable for automotive battery management, CAN FD interface protection, and industrial sensor signal conditioning requiring stable component supply and full traceability.
Supply support for SMF4L75CA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMF4L series belongs to Diodes' high-reliability transient suppression portfolio, engineered specifically for AEC-Q200-compliant automotive and industrial applications demanding robust ESD immunity, tight clamping, and ultra-small SMT packaging.
FAQ
What is the maximum clamping voltage of SMF4L75CA-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 121V at 3.3A peak pulse current under the standardized 10/1000µs waveform. This value is measured per JEDEC test conditions and guarantees that downstream circuitry sees no more than 121V during surge events, enabling reliable protection of 100V-rated components like automotive-grade DC-DC controllers.
Is SMF4L75CA-7 unidirectional or bidirectional, and how is polarity identified?
SMF4L75CA-7 is a bi-directional TVS diode, confirmed by its "CA" suffix and absence of cathode band marking per the DO-219AA mechanical drawing. Unlike unidirectional types (e.g., SMF4L75A), it provides symmetrical clamping for both positive and negative transients - essential for protecting differential buses like CAN, LIN, or RS-485 without polarity concerns.
Does SMF4L75CA-7 meet automotive qualification standards?
The base SMF4L75CA-7 is not AEC-Q200 qualified; however, Diodes offers the automotive-grade variant SMF4L75CAQ-7, which is fully qualified to AEC-Q200 Rev H, manufactured in IATF 16949-certified facilities, and supports PPAP documentation. Customers requiring automotive release must specify the Q-suffix part number.
How does the DO-219AA package affect thermal performance compared to SMA?
DO-219AA delivers significantly better thermal performance than SMA: its junction-to-case thermal resistance (RθJC) is 18°C/W versus ~50°C/W for SMA, due to optimized die attach and low-profile copper lead frame. This allows sustained 400W pulse handling with less localized heating, reducing derating needs in high-density layouts and extending lifetime under repetitive surge conditions.
SMF4L75CA-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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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
SMF4L75CA-7 FAQ
1.How can I place an order for SMF4L75CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L75CA-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 SMF4L75CA-7 reliable?
The price and inventory of SMF4L75CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L75CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L75CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L75CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L75CA-7?
SMF4L75CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L75CA-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 SMF4L75CA-7?
For technical support, including SMF4L75CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L75CA-7 requirements.
6.How does Aetrix verify that SMF4L75CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L75CA-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 SMF4L75CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L75CA-7?
All SMF4L75CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L75CA-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 SMF4L75CA-7 part is unused and in its original packaging.
Return procedure for SMF4L75CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L75CA-7 Tags
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Diodes Incorporated
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