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Diodes Incorporated SMF4L24AQ-7
- Part No.:
- SMF4L24AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L24AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,703
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Product details
Overview
SMF4L24AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 24V working peak reverse voltage, 26.7–29.5V breakdown range, and 38.9V maximum clamping voltage at 10.3A surge current. It delivers ±30kV ESD protection per IEC61000-4-2 and is AEC-Q101 qualified for automotive power line and battery contact protection.
For engineers reviewing the SMF4L24AQ-7 datasheet, SMF4L24AQ-7 pinout, SMF4L24AQ-7 application, or SMF4L24AQ-7 equivalent, this device is selected for high-reliability DC power rail surge suppression where fast response (<1.0ns), low leakage (<0.5μA), and DO-219AA space-constrained packaging are critical.
Technical Context
This TVS operates as a unidirectional clamp in series with positive supply rails, activating when reverse voltage exceeds 26.7V to divert transients away from downstream ICs. Its 400W peak pulse power (10/1000µs waveform) and 38.9V clamping voltage at 10.3A ensure robust protection against ISO 7637-2 pulses and load dump events.
Designed for automotive-grade reliability, it features AEC-Q101 qualification, IATF 16949 manufacturing, and operates across –55°C to +175°C. The DO-219AA package enables low-inductance PCB layout with 0.016g mass and 94V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 24 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 26.7 V / 29.5 V - Breakdown initiates within this range at 1 mA test current |
| VC @ IPP | 38.9 V - Clamping voltage observed at 10.3 A peak surge current |
| IPP (max) | 10.3 A - Peak pulse current supported under 10/1000 µs waveform |
| IR @ VRWM | <0.5 µA - Reverse leakage ensures minimal standby power loss in battery systems |
| ESD Rating | ±30 kV (air/contact) - Full IEC61000-4-2 Level 4 compliance without external circuitry |
| Response Time | <1.0 ns - Enables protection of high-speed logic and MCU I/O pins against nanosecond transients |
Pinout & Package
Package: DO-219AA - ultra-thin, surface-mount plastic case with cathode band marking; dimensions: 1.90 mm × 2.80 mm × 0.60 mm (L×W×H); weight: 0.016 g; moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side for unidirectional clamping | Connected to protected line (e.g., battery+); conducts during forward surge only if misapplied |
| Cathode | Clamp output / reference node | Connected to ground or lower-potential rail; carries full surge current during transient event |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Supports ISO 7637-2 Pulse 1/2a/5a testing without derating on standard FR-4 layouts |
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics applications requiring PPAP submission |
| DO-219AA footprint | Reduces board area by 40% vs. SMA while maintaining thermal performance via low RθJC (18°C/W) |
| Lead-free & halogen-free | Complies with RoHS 3 and automotive "Green" standards (<900 ppm Br/Cl, <1000 ppm Sb) |
| Fast 1.0 ns response | Clamps before most microcontroller I/O structures can be damaged by EFT or ESD events |
Applications
| Automotive Power Distribution | Battery Management Systems |
|---|---|
Use Scenario: Protection of 24V CAN bus power lines and LIN transceiver supplies against load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS placed between fused battery feed and regulator input. Use Value: Limits clamped voltage to 38.9V, preventing overvoltage damage to 40V-rated LDOs and CAN PHYs. |
Use Scenario: Guarding cell monitor IC inputs and fuel gauge analog front-ends in 12–48V battery packs. IC Role / Device Role: Point-of-load TVS on sense resistor return paths and ADC reference rails. Use Value: Sub-0.5μA leakage avoids measurement drift; DO-219AA allows placement adjacent to precision analog components. |
| Industrial Control Power Rails | Telematics Module Inputs |
Use Scenario: Surge suppression on 24V PLC I/O module power inputs exposed to relay coil back-EMF and field wiring noise. IC Role / Device Role: Primary clamping device upstream of DC/DC converters and isolated gate drivers. Use Value: 400W rating handles repetitive 50A/10ms surges common in factory automation environments. |
Use Scenario: Protecting GNSS/GSM antenna power feeds and USB-C VBUS lines in vehicle-mounted telematics units. IC Role / Device Role: Bidirectional-capable variant not used; unidirectional SMF4L24AQ-7 applied on DC bias lines only. Use Value: Cathode-band polarity ensures correct orientation in compact 2-layer PCB designs with tight keep-out zones. |
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 | Higher clamping voltage (43.5V @ 9.2A); SMA package (larger footprint, higher inductance) | Limited suitability for space-constrained automotive modules due to 4.5mm × 2.7mm outline | Select when legacy SMA layout exists and 4.5V higher VC is acceptable for downstream 45V-rated components |
| TPSMD24 | Lower peak power (300W); same DO-219AA package; 37.5V clamping at 8.0A | Not AEC-Q101 qualified; intended for industrial/commercial use only | Choose for cost-sensitive non-automotive designs where 100W lower pulse rating meets system test requirements |
Compared with SMAJ24A and TPSMD24, SMF4L24AQ-7 uniquely balances AEC-Q101 compliance, DO-219AA miniaturization, and 38.9V clamping-enabling next-gen automotive ECUs to pass stringent OEM surge immunity tests without layout compromise.
Availability
SMF4L24AQ-7 is available at Aetrix Electronics and suitable for automotive power distribution, battery management systems, and industrial control power rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMF4L24AQ-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 protection, power management, and signal integrity solutions for automotive and industrial markets.
The SMF4LxxAQ series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for compact, high-surge automotive subsystems where DO-219AA footprint and sub-1ns response are mandatory.
FAQ
What is the maximum operating temperature for SMF4L24AQ-7?
The SMF4L24AQ-7 is rated for junction temperatures from –55°C to +175°C, validated per AEC-Q101 stress testing. Its thermal resistance (RθJC = 18°C/W) enables reliable operation in under-hood automotive environments when mounted on 2 oz. copper pads per Diodes' recommended layout.
Is SMF4L24AQ-7 unidirectional or bidirectional?
SMF4L24AQ-7 is unidirectional, indicated by its cathode band marking. It clamps only during reverse-voltage transients on the anode-to-cathode path and conducts forward current only under fault conditions. The bidirectional variant is SMF4L24CAQ-7, which lacks the cathode band.
Does SMF4L24AQ-7 require a heatsink for 400W pulse handling?
No external heatsink is required for single 10/1000µs pulses. The 400W rating is defined for non-repetitive events; thermal design relies on PCB copper area (1" × 1", 2 oz. Cu per Diodes' spec). Continuous power dissipation is limited to 1.0W DC, well below pulse energy accumulation thresholds.
How does SMF4L24AQ-7 differ from older SMF24A devices?
SMF4L24AQ-7 uses the smaller DO-219AA package (vs. DO-214AB in SMF24A), achieves lower clamping voltage (38.9V vs. ~44V), and adds AEC-Q101 qualification with enhanced ESD robustness (±30kV vs. ±25kV). It also features halogen/antimony-free "Green" molding compound compliant with latest automotive environmental standards.
SMF4L24AQ-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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L24AQ-7 FAQ
1.How can I place an order for SMF4L24AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L24AQ-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 SMF4L24AQ-7 reliable?
The price and inventory of SMF4L24AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L24AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L24AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L24AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L24AQ-7?
SMF4L24AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L24AQ-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 SMF4L24AQ-7?
For technical support, including SMF4L24AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L24AQ-7 requirements.
6.How does Aetrix verify that SMF4L24AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L24AQ-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 SMF4L24AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L24AQ-7?
All SMF4L24AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L24AQ-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 SMF4L24AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L24AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L24AQ-7 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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