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Diodes Incorporated SMF4L9.0AQ-7
- Part No.:
- SMF4L9.0AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L9.0AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:4,211
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Product details
Overview
SMF4L9.0AQ from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in automotive and industrial power rails. It features a 9.0V working peak reverse voltage (VRWM), 10V minimum breakdown voltage (VBR), 15.4V maximum clamping voltage (VC) at 26A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is AEC-Q101 qualified and used in battery contact protection circuits.
For engineers reviewing the SMF4L9.0AQ datasheet, SMF4L9.0AQ pinout, SMF4L9.0AQ application, or SMF4L9.0AQ equivalent, key selection criteria include clamping performance under 26A surge, unidirectional polarity for DC rail protection, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with IEC61000-4-2 ±30kV ESD immunity.
Technical Context
This TVS diode operates as a fast-acting shunt clamp on DC power lines, activating when transient voltage exceeds its 10V breakdown threshold to divert up to 26A surge current away from sensitive downstream circuitry. Its sub-1ns response time ensures protection against EFT and lightning-induced transients before system-level damage occurs.
The device uses silicon avalanche junction technology in a planar construction, optimized for low dynamic impedance and stable clamping across temperature (–55°C to +175°C operating range). Its unidirectional configuration supports polarity-sensitive applications such as automotive 12V battery feeds and USB power inputs where reverse blocking is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0V - Maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 12V automotive systems. |
| VBR (min) | 10.0V - Minimum breakdown voltage at 1mA test current; defines earliest activation point for transient suppression. |
| VC (max) | 15.4V - Maximum clamping voltage at 26A IPP; determines peak stress imposed on protected ICs during surge events. |
| IPP (max) | 26A - Peak pulse current capability under 10/1000µs waveform; quantifies surge energy handling capacity. |
| PPK | 400W - Peak pulse power rating; enables reliable protection against ISO 7637-2 Pulse 1/2a/2b and IEC 61000-4-5 surges. |
| IR @ VRWM | 5µA - Reverse leakage current at rated VRWM; ensures minimal standby power loss in always-on battery-connected circuits. |
| TJ Range | –55°C to +175°C - Extended junction temperature range supports under-hood automotive placement and industrial high-temp environments. |
Pinout & Package
Package: DO-219AA - surface-mount, ultra-low-profile (height ≤ 0.75mm), green molded plastic case with matte tin-plated copper alloy leadframe; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; forms cathode-to-anode conduction path during transient clamping. |
| Cathode (marked with band) | High-side surge input terminal | Connected to protected line (e.g., battery+); avalanche breakdown initiates here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD protection | ±30kV air discharge, ±30kV contact discharge - meets highest industrial and automotive ESD immunity requirements without external shielding. |
| AEC-Q101 qualification | Qualified for automotive applications with PPAP capability and IATF 16949 manufacturing - supports Tier-1 supply chain traceability and change control. |
| Fast response time | <1.0ns (unidirectional) - activates before most microcontroller I/O pins can be damaged by EFT or ESD events. |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant (Br+Cl <1500ppm, Sb <1000ppm) - satisfies EU environmental mandates and OEM sustainability targets. |
| Thermal performance | RθJA = 96°C/W on 1"×1" FR-4 board - enables stable operation in compact PCB layouts without heatsinking. |
Applications
| Automotive Battery Protection | USB Power Input Protection |
|---|---|
|
Use Scenario: 12V battery feed line in engine control unit (ECU) exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery+ and ground to clamp ISO 7637-2 Pulse 5a (load dump) to ≤15.4V. Use Value: Prevents overvoltage damage to 3.3V/5V LDOs and CAN transceivers by limiting clamped voltage below their absolute maximum ratings. |
Use Scenario: VBUS line of USB Type-C port in infotainment head unit subjected to hot-plug ESD and cable-induced surges. IC Role / Device Role / Timing Role: Primary front-end clamp protecting USB controller and power switch from ±30kV contact ESD per IEC61000-4-2. Use Value: Eliminates need for secondary TVS stages due to low clamping voltage and sub-1ns response, preserving signal integrity on high-speed data lines. |
| Industrial Sensor Power Rail | DC Motor Drive Control Supply |
|
Use Scenario: 24V auxiliary supply feeding analog sensor front-ends in factory automation PLC modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24V rail to suppress inductive switching noise from nearby solenoid drivers. Use Value: Maintains <5µA leakage at 24V derated VRWM, preventing false triggering of precision ADC references while clamping transients to safe levels. |
Use Scenario: Gate driver supply rail in H-bridge motor controller subject to back-EMF spikes during PWM commutation. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp absorbing repetitive 26A surges generated by motor coil flyback. Use Value: Withstands 400W peak pulses without degradation, enabling >100,000 surge cycles per AEC-Q101 lifetime testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A | DO-214AC package; higher RθJA (125°C/W); 14.5V VC at 23.5A IPP | Larger footprint; lower surge current rating; less suitable for space-constrained automotive modules | Prefer SMF4L9.0AQ where board area and thermal performance are critical. |
| 1.5SMC9.0A | DO-214AB package; 400W rating but 15.0V VC at 26.7A IPP; higher leakage (10µA) | Higher clamping voltage increases risk to downstream 12V-tolerant ICs; not AEC-Q101 qualified | Choose SMF4L9.0AQ for AEC-Q101-compliant designs requiring tighter clamping and lower leakage. |
Compared with SMAJ9.0A and 1.5SMC9.0A, SMF4L9.0AQ delivers superior thermal efficiency (96°C/W vs. ≥125°C/W), lower clamping voltage (15.4V vs. ≥14.5V), and automotive-grade qualification-making it optimal for high-reliability, space-constrained 12V rail protection.
Availability
SMF4L9.0AQ is available at Aetrix Electronics and suitable for automotive battery management, USB power interface design, and industrial sensor power conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMF4L9.0AQ 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, industrial, and consumer markets.
The SMF4Lx.xAQ series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for compact, high-surge-capacity protection in next-generation automotive electronics and harsh-environment industrial controls.
FAQ
What is the polarity configuration of SMF4L9.0AQ?
SMF4L9.0AQ is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only when the cathode is positive relative to the anode, making it suitable for DC power line protection where reverse voltage blocking is required. Its behavior matches a standard Zener diode in reverse bias.
How does SMF4L9.0AQ perform under repeated surge stress?
Rated for 400W peak pulse power (10/1000µs waveform) and qualified to AEC-Q101, SMF4L9.0AQ maintains stable clamping voltage and leakage current after ≥1000 surge cycles at rated IPP. Its planar silicon junction and low thermal resistance (RθJA = 96°C/W) prevent parametric shift during repetitive transient events in automotive and industrial use.
Can SMF4L9.0AQ replace older SMAJ9.0A in existing designs?
Yes, with layout adaptation: SMF4L9.0AQ uses DO-219AA (1.90 × 2.80 mm) versus SMAJ9.0A's DO-214AC (4.32 × 2.62 mm), reducing footprint by ~60%. Electrical replacement is direct-same VRWM, VBR, and VC-but thermal performance improves significantly due to lower RθJA and higher surge current tolerance (26A vs. 23.5A).
Is SMF4L9.0AQ compatible with lead-free reflow processes?
Yes-SMF4L9.0AQ features a matte tin finish on copper alloy leadframe and is rated for standard lead-free reflow profiles (JEDEC J-STD-020, peak 260°C). Its moisture sensitivity level is 1, eliminating bake requirements prior to assembly. The green molding compound meets UL 94V-0 flammability and RoHS 3 compliance.
SMF4L9.0AQ-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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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
SMF4L9.0AQ-7 FAQ
1.How can I place an order for SMF4L9.0AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L9.0AQ-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 SMF4L9.0AQ-7 reliable?
The price and inventory of SMF4L9.0AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L9.0AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L9.0AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L9.0AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L9.0AQ-7?
SMF4L9.0AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L9.0AQ-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 SMF4L9.0AQ-7?
For technical support, including SMF4L9.0AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L9.0AQ-7 requirements.
6.How does Aetrix verify that SMF4L9.0AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L9.0AQ-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 SMF4L9.0AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L9.0AQ-7?
All SMF4L9.0AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L9.0AQ-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 SMF4L9.0AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L9.0AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L9.0AQ-7 Tags
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