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Diodes Incorporated SMF4L24A-7
- Part No.:
- SMF4L24A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L24A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMF4L24A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 24V working peak reverse voltage (VRWM), 26.7–29.5V breakdown voltage (VBR) at 1mA, 38.9V maximum clamping voltage (VC) at 10.3A peak pulse current, and IEC61000-4-2 ±30kV ESD immunity - deployed in automotive battery contacts and industrial power management systems.
For engineers reviewing the SMF4L24A-7 datasheet, SMF4L24A-7 pinout, SMF4L24A-7 application, or SMF4L24A-7 equivalent, this page delivers verified electrical parameters, DO-219AA package details, real-world use scenarios, and validated alternative parts - all grounded in Diodes' DS43394 Rev. 3-2 specification and official mechanical data.
Technical Context
This TVS operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast transient suppression on DC power lines. Its sub-1ns response time (<1.0ns from 0V to VBR min) ensures protection against EFT (IEC61000-4-4) and lightning-induced surges (10/1000µs waveform).
The device uses silicon planar construction in a molded DO-219AA package with matte tin-plated copper alloy leads, rated for -55°C to +175°C operation and qualified per JEDEC high-reliability standards. Thermal resistance junction-to-ambient is 96°C/W on standard FR-4 PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10µs × 1000µs waveform) - sustains single-event surge energy without failure |
| Working Peak Reverse Voltage | 24V - maximum continuous DC or RMS voltage before leakage exceeds 1µA |
| Breakdown Voltage (VBR) | 26.7–29.5V @ 1mA - precise avalanche onset threshold for predictable clamping |
| Clamping Voltage (VC) | 38.9V @ 10.3A - limits downstream circuit voltage during 400W transient event |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - meets automotive and industrial ESD immunity requirements |
| Leakage Current (IR) | 0.5µA @ 24V - negligible standby power loss in battery-powered systems |
| Package | DO-219AA - ultra-compact 2.8mm × 1.9mm footprint with low thermal resistance (RθJA = 96°C/W) |
Pinout & Package
SMF4L24A-7 is housed in the DO-219AA surface-mount package: a 2-pin, flat-lead, cathode-banded, lead-free, halogen-free molded plastic case measuring 2.80mm × 1.90mm × 0.60mm (L × W × H). The cathode band denotes the cathode terminal; anode is the opposite end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point under forward bias; connected to protected line's lower-potential side | Enables unidirectional clamping - conducts only when line voltage drops below ground reference |
| Cathode | Current exit point under forward bias; marked by band; tied to system ground or higher-potential rail | Defines clamping direction - avalanche conduction occurs when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast response time | <1.0ns (unidirectional) - captures transients before sensitive ICs experience overstress |
| High ESD robustness | ±30kV contact discharge - eliminates need for secondary ESD protection in cost-sensitive designs |
| Green packaging compliance | RoHS 3, halogen-free (<900ppm Br+Cl), antimony-free - satisfies automotive Tier-1 environmental mandates |
| Thermal performance | RθJC = 18°C/W - enables reliable operation at 175°C junction temperature in engine bay applications |
| Automotive readiness | JEDEC-qualified high-reliability construction - supports AEC-Q200-compliant derivative (Q-suffix) qualification path |
Applications
| Automotive Battery Protection | Industrial Power Rail Clamping |
|---|---|
|
Use Scenario: Protecting 24V battery-fed ECUs from load dump and jump-start surges in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps 38.9V at 10.3A to prevent MOSFET gate oxide rupture and regulator latch-up during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding PLC I/O module power inputs against induced surges from relay coil flyback and motor switching. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24V auxiliary supply rail upstream of LDOs and microcontrollers. Use Value: Limits transient voltage to ≤38.9V within 1ns, preserving 3.3V/5V logic integrity without derating margin loss. |
| USB-C Power Delivery Line | Telecom DC Feeder Protection |
|
Use Scenario: Guarding USB-C VBUS line in portable docking stations against hot-plug overshoot and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS path, positioned after fuse but before buck controller. Use Value: Withstands ±30kV ESD strikes while maintaining <0.5µA leakage at 24V - avoids false triggering of PD negotiation. |
Use Scenario: Protecting 48V DC feeder lines in remote radio units (RRUs) from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground on positive feed conductor. Use Value: Delivers 400W pulse handling with 38.9V clamping - keeps PoE-like interface ICs within absolute maximum ratings during Telcordia GR-1089 Class B events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | DO-214AC package; 400W rating; VBR = 26.7–29.5V; VC = 38.9V @ 10.3A - identical electrical specs but 3.5mm × 2.7mm footprint | Larger board area required; less suitable for space-constrained automotive modules | Select when legacy SMA layout exists or thermal mass requirement exceeds DO-219AA capability |
| SMF4L24CA | Bi-directional variant; same DO-219AA package; VRWM = 24V; VBR = 26.7–29.5V; VC = 38.9V @ 10.3A; IR = 1.0µA (doubled) | Protects AC-coupled or bidirectional signal lines (e.g., CAN, RS-485); not for DC power rails | Choose only for symmetrical transient threats where polarity reversal is possible |
Compared with SMAJ24A, SMF4L24A-7 saves >50% PCB area while matching clamping performance; versus SMF4L24CA, it offers half the leakage for DC bias stability but lacks bidirectional surge tolerance.
Availability
SMF4L24A-7 is available at Aetrix Electronics and suitable for automotive battery protection, industrial power rail clamping, and USB-C power delivery line protection requiring stable component supply across production lifecycles.
Supply support for SMF4L24A-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.
SMF4L24A-7 belongs to Diodes' SMF4L series of high-power, low-profile TVS diodes engineered specifically for space-constrained automotive and industrial power systems demanding AEC-Q200-aligned reliability and IEC61000-4-2 compliance.
FAQ
What is the maximum operating temperature for SMF4L24A-7?
The SMF4L24A-7 is rated for junction temperatures from –55°C to +175°C. Its thermal resistance junction-to-ambient is 96°C/W on a standard 1" × 1" FR-4 board with 2 oz. copper, enabling reliable operation in under-hood automotive environments and industrial enclosures without forced cooling.
Is SMF4L24A-7 compliant with automotive qualification standards?
SMF4L24A-7 is JEDEC-qualified for high reliability and manufactured in IATF 16949-certified facilities. While the base part is not AEC-Q200 certified, Diodes offers a Q-suffix automotive-grade variant (e.g., SMF4L24AQ) with full PPAP documentation and extended temperature validation.
How does the DO-219AA package compare to SMA (DO-214AC) in thermal performance?
DO-219AA has RθJC = 18°C/W and RθJA = 96°C/W, versus SMA's typical RθJA ≈ 65°C/W - meaning DO-219AA achieves lower junction temperature rise per watt under identical PCB layout due to its thinner profile and optimized thermal path to the cathode tab, despite smaller footprint.
Can SMF4L24A-7 be used in bidirectional signal lines like CAN or RS-485?
No - SMF4L24A-7 is unidirectional (cathode-banded) and only clamps positive transients relative to ground. For bidirectional protection, use the bi-directional SMF4L24CA variant, which provides symmetrical clamping above and below ground with doubled leakage (1.0µA at VRWM).
SMF4L24A-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:
- 1
- Bidirectional Channels:
- -
- 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
SMF4L24A-7 FAQ
1.How can I place an order for SMF4L24A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L24A-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 SMF4L24A-7 reliable?
The price and inventory of SMF4L24A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L24A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L24A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L24A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L24A-7?
SMF4L24A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L24A-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 SMF4L24A-7?
For technical support, including SMF4L24A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L24A-7 requirements.
6.How does Aetrix verify that SMF4L24A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L24A-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 SMF4L24A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L24A-7?
All SMF4L24A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L24A-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 SMF4L24A-7 part is unused and in its original packaging.
Return procedure for SMF4L24A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L24A-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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