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Diodes Incorporated SMF4L24CA-7
- Part No.:
- SMF4L24CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L24CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:7,492
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Product details
Overview
SMF4L24CA-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 on data lines and power rails. It features a 24V working peak reverse voltage (VRWM), 26.7V minimum breakdown voltage (VBR), 38.9V maximum clamping voltage (VC) at 10.3A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is used in automotive infotainment USB interfaces to protect against ISO 10605 ±30kV contact discharge.
For engineers reviewing the SMF4L24CA-7 datasheet, SMF4L24CA-7 pinout, SMF4L24CA-7 application, or SMF4L24CA-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, IEC 61000-4-2 ESD robustness, bi-directional symmetry for AC-coupled signal lines, and thermal performance under repeated surge events in compact automotive PCB layouts.
Technical Context
This bi-directional TVS operates symmetrically across both polarities with matched VBR min/max (26.7V / 29.5V @ 1mA) and identical clamping behavior in forward and reverse directions. Its sub-5ns response time ensures suppression before sensitive downstream circuitry sustains damage during fast transients like ESD or inductive switching spikes.
The device uses planar junction silicon construction in a low-inductance DO-219AA surface-mount package, enabling effective suppression of high-frequency surge energy without parasitic resonance. Thermal resistance from junction to solder point (RθJS = 70°C/W) supports reliable operation under repetitive 400W pulses when mounted on 2 oz. copper pads per JEDEC layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line DC bias. |
| VBR (min/max) | 26.7V / 29.5V @ 1mA - Confirmed breakdown threshold range; defines onset of avalanche conduction during overvoltage events. |
| VC @ IPP | 38.9V @ 10.3A - Clamping voltage measured at peak pulse current; determines maximum stress imposed on downstream ICs. |
| PPK | 400W (10/1000µs) - Peak surge power handling capability; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ESD Rating | ±30kV air / ±30kV contact (IEC 61000-4-2) - Confirmed immunity level for human-body-model ESD events on exposed connectors. |
| IR @ VRWM | 0.5µA - Reverse leakage at rated working voltage; ensures negligible standby power loss in battery-powered systems. |
| Package | DO-219AA - Compact 2.8mm × 1.9mm surface-mount outline with low thermal resistance (RθJS = 70°C/W) and RoHS-compliant matte tin terminations. |
Pinout & Package
SMF4L24CA-7 is a two-terminal bi-directional TVS diode in DO-219AA package. No cathode band marking; terminals are symmetrical and interchangeable. The package has no polarity designation and functions identically in either orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals serve as bidirectional surge conduction paths; no fixed anode/cathode assignment due to bi-directional architecture. |
| Case / Body | Thermal interface | Exposed copper lead frame provides primary heat transfer path to PCB; requires direct soldering to thermal pad per JEDEC layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping symmetry | Matched VBR and VC in both polarities enables protection of AC-coupled or floating differential lines without polarity concerns. |
| Sub-5ns response time | Ensures clamping activation within 5ns of transient onset, limiting voltage overshoot before sensitive logic or analog inputs are stressed. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage margin between breakdown and clamping, reducing stress on protected ICs while maintaining robust surge margin. |
| Green, halogen-free construction | Meets J-STD-020 moisture sensitivity level 1 and contains <900ppm Br/Cl, supporting automotive PPAP and IATF 16949 compliance. |
| High-reliability qualification | Qualified to AEC-Q101 standards for discrete semiconductors, including HTGB, AC/DC life test, and temperature cycling. |
Applications
| Automotive Infotainment USB Port | Industrial CAN Bus Node |
|---|---|
|
Use Scenario: Protecting USB 2.0 D+/D− lines in head unit against ESD from user insertion and cable coupling. IC Role / Device Role: Bi-directional TVS placed directly at connector, shunting transient energy to ground before reaching USB transceiver. Use Value: Maintains signal integrity with <1pF junction capacitance while clamping to 38.9V-well below USB PHY's 40V abs max rating. |
Use Scenario: Guarding CANH/CANL differential pair in vehicle body control module against load dump and inductive kickback. IC Role / Device Role: Paired bi-directional TVS devices on each line, referenced to chassis ground, absorbing common-mode surges up to 400W. Use Value: Withstands repeated ISO 7637-2 Pulse 5a (12V system) without degradation, preserving bus timing and error-free communication. |
| Smart Meter RS-485 Interface | Medical Patient Monitor ECG Input |
|
Use Scenario: Securing long-haul RS-485 data lines in utility meters exposed to lightning-induced surges on outdoor wiring. IC Role / Device Role: Line-to-ground TVS on A/B bus lines, coordinated with GDT front-end for multi-stage protection. Use Value: 38.9V clamping prevents latch-up in isolated RS-485 transceivers while surviving 10/1000µs surges up to 10.3A. |
Use Scenario: Safeguarding high-impedance ECG electrode inputs against defibrillator discharge and hospital-grade ESD events. IC Role / Device Role: Low-leakage (0.5µA) bi-directional TVS placed after input RC filter to avoid signal distortion. Use Value: Enables Class BF patient-connected design by limiting leakage and ensuring <±30kV IEC 61000-4-2 immunity without compromising DC accuracy. |
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 |
|---|---|---|---|
| SMAJ24CA | Same VRWM (24V) but SMA package (larger footprint, RθJA = 96°C/W vs. 70°C/W); 400W rating at 10/1000µs; VBR min 26.7V, VC 38.9V. | Higher thermal resistance limits repetitive surge duty cycle in space-constrained designs; less suitable for dense automotive PCBs. | Select when legacy SMA footprint compatibility is required and thermal derating can be accommodated via larger copper area. |
| TPSMF24CA | Same DO-219AA package and electrical specs, but qualified to AEC-Q101 Grade 0 (–40°C to +175°C) and includes enhanced PPAP documentation support. | Designed specifically for automotive safety-critical modules requiring full change control and IATF 16949 traceability. | Select for new automotive programs where full PPAP submission, lot-level reliability data, and extended temperature validation are mandatory. |
Compared with SMAJ24CA and TPSMF24CA, SMF4L24CA-7 offers optimal balance of compact DO-219AA packaging, industry-standard AEC-Q101 qualification, and cost-effective sourcing-making it ideal for volume automotive and industrial applications where thermal efficiency and supply chain stability are prioritized over Grade 0 extremes or legacy footprint retention.
Availability
SMF4L24CA-7 is available at Aetrix Electronics and suitable for automotive infotainment, industrial CAN networks, smart metering, and medical patient monitoring systems requiring stable component supply and consistent surge protection performance across production batches.
Supply support for SMF4L24CA-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 distribution operations across Asia, Europe, and North America.
The SMF4L series belongs to Diodes' high-reliability transient suppression portfolio, engineered specifically for automotive and industrial applications demanding robust ESD immunity, tight parametric consistency, and AEC-Q101 qualification in ultra-compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMF4L24CA-7 under standard test conditions?
The maximum clamping voltage (VC) is 38.9V at 10.3A peak pulse current using the 10/1000µs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (–55°C to +175°C) and represents the highest voltage seen across the device during worst-case surge events.
Is SMF4L24CA-7 suitable for protecting high-speed data lines like USB 2.0 or HDMI?
Yes-its typical junction capacitance is below 1pF at 0V, minimizing signal distortion on 480Mbps USB 2.0 differential pairs. Combined with sub-5ns response and symmetrical bi-directional clamping, it preserves eye diagram integrity while meeting IEC 61000-4-2 ±30kV ESD requirements at the connector.
How does the DO-219AA package improve thermal performance compared to SMA or SMC?
The DO-219AA package achieves RθJS = 70°C/W (junction-to-solder-point), significantly lower than SMA's 96°C/W. Its low-profile, wide-pad design maximizes copper contact area, enabling faster heat extraction during repetitive 400W surges-critical for automotive modules operating in high-ambient environments.
Does SMF4L24CA-7 meet automotive qualification standards?
Yes-it is qualified to AEC-Q101 Rev H for discrete semiconductors, including stress tests for high-temperature operating life, humidity resistance, and mechanical shock. It is manufactured in IATF 16949-certified facilities and supports PPAP documentation for Tier 1 automotive programs.
SMF4L24CA-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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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
SMF4L24CA-7 FAQ
1.How can I place an order for SMF4L24CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L24CA-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 SMF4L24CA-7 reliable?
The price and inventory of SMF4L24CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L24CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L24CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L24CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L24CA-7?
SMF4L24CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L24CA-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 SMF4L24CA-7?
For technical support, including SMF4L24CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L24CA-7 requirements.
6.How does Aetrix verify that SMF4L24CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L24CA-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 SMF4L24CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L24CA-7?
All SMF4L24CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L24CA-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 SMF4L24CA-7 part is unused and in its original packaging.
Return procedure for SMF4L24CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L24CA-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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