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Diodes Incorporated SMF4L7.5AQ-7
- Part No.:
- SMF4L7.5AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L7.5AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,045
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Product details
Overview
SMF4L7.5AQ from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection on low-voltage DC power rails and signal lines. It features a 7.5V working peak reverse voltage (VRWM), 8.3V minimum breakdown voltage (VBR), 12.9V maximum clamping voltage (VC) at 31A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is AEC-Q101 qualified and used in battery contact protection and ECU power input stages.
For engineers reviewing the SMF4L7.5AQ datasheet, SMF4L7.5AQ pinout, SMF4L7.5AQ application, or SMF4L7.5AQ equivalent, key selection criteria include clamping performance at 31A surge, unidirectional polarity for DC rail protection, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with IEC61000-4-2 ±30kV ESD.
Technical Context
This TVS operates as a fast-acting shunt clamp during transient events, diverting surge current away from sensitive downstream circuitry when reverse voltage exceeds its 8.3V breakdown threshold. Its sub-1ns response time ensures protection against ESD and fast-rising transients typical in automotive 12V systems.
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 provides forward conduction path only under reverse overvoltage, making it suitable for DC supply line protection where polarity is fixed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.5V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system nominal voltage (e.g., 5V or 12V rails). |
| VBR (min) | 8.3V @ 1mA - Guaranteed avalanche initiation voltage; ensures reliable triggering above VRWM with 0.8V design margin. |
| VC (max) | 12.9V @ 31A - Maximum clamped voltage during 10/1000µs surge; limits stress on protected ICs (e.g., MCU I/O or PMIC inputs). |
| PPK | 400W - Peak pulse power handling capability; supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC61000-4-5 surges. |
| IR @ VRWM | 100µA - Low leakage current at rated standoff voltage; minimizes quiescent power loss in always-on automotive modules. |
| TJ Range | –55°C to +175°C - Extended temperature rating enables use in engine bay, battery management, and under-hood ECUs. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics, including HTOL, TCT, and ESD qualification per JESD22. |
Pinout & Package
Package: DO-219AA - Surface-mount, flat-lead, molded plastic case with matte tin-plated copper alloy leadframe; 0.016g weight; UL 94V-0 rated; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms cathode-to-anode conduction path during reverse transient. |
| Cathode (marked band) | High-side connection point | Connected to protected line (e.g., battery+ or VCC); avalanche conduction occurs when cathode voltage exceeds anode by ≥8.3V. |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD protection | ±30kV air, ±30kV contact - Enables single-device compliance without external RC networks in infotainment and body control modules. |
| Fast response time | <1.0ns (unidirectional) - Clamps transients before propagation into microcontroller GPIO or CAN transceiver inputs. |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant - Meets automotive OEM environmental requirements and end-of-life recycling mandates. |
| Thermal performance | RθJA = 96°C/W on 1"×1" FR-4, 2 oz Cu - Supports sustained operation in high-ambient environments without derating at full power. |
| Automotive qualification | AEC-Q101, PPAP capable, IATF 16949 manufactured - Ensures supply chain traceability and process consistency for Tier 1 production programs. |
Applications
| Automotive Body Control Module (BCM) | 12V Battery Contact Protection |
|---|---|
Use Scenario: Protects microcontroller power inputs and LIN bus transceivers from load dump and jump-start transients in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between VBAT and GND, triggered within 1ns of overvoltage event. Use Value: Limits clamped voltage to ≤12.9V at 31A, preventing latch-up or permanent damage to 5V/3.3V logic supplies. |
Use Scenario: Installed across vehicle battery terminals to suppress ESD and ignition coil coupling during service operations. IC Role / Device Role / Timing Role: Primary front-end TVS on main power entry; absorbs >90% of 30kV ESD energy before reaching fuse box or DC-DC converter. Use Value: Maintains <100µA leakage at 7.5V, eliminating parasitic drain in parked vehicle mode while surviving repeated ±30kV contact discharges. |
| Infotainment System USB Power Rail | Telematics LTE Modem VCC Line |
Use Scenario: Safeguards USB Type-C VBUS input from hot-plug transients and cable-induced surges in head unit designs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch; clamps to 12.9V before USB PD controller overvoltage lockout activates. Use Value: Enables direct integration without series resistors or additional filtering, reducing BOM count and PCB area in space-constrained dashboards. |
Use Scenario: Shields LTE modem's 3.3V/5V supply pins from antenna-coupled RF transients and power rail noise in connected car telematics units. IC Role / Device Role / Timing Role: Secondary-level TVS on regulated output rail; activated only during fast-edge surges exceeding 8.3V, complementing primary DC-DC OVP. Use Value: Provides 400W surge capacity with <1ns response, ensuring modem remains operational during roadside ESD events without reset or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A | DO-214AC package; higher RθJA (110°C/W); 13.3V VC @ 30.5A | Larger footprint; lower thermal efficiency on dense PCBs; less suitable for under-hood placement | Prefer SMF4L7.5AQ where board space and thermal performance are constrained, e.g., in compact telematics modules. |
| TPSMA6L7.5A | DO-214AC; AEC-Q101 qualified; 12.5V VC @ 31.5A; 1.5pF junction capacitance | Higher capacitance may degrade high-speed signal integrity; same thermal limitations as SMAJ7.5A | Choose SMF4L7.5AQ for superior thermal resistance and smaller DO-219AA footprint in new automotive designs targeting ASIL-B functional safety paths. |
Compared with SMAJ7.5A and TPSMA6L7.5A, SMF4L7.5AQ delivers 12% lower thermal resistance and 25% smaller footprint while maintaining identical clamping performance and AEC-Q101 compliance-making it optimal for next-generation space- and thermally-constrained automotive electronics.
Availability
SMF4L7.5AQ is available at Aetrix Electronics and suitable for automotive body control modules, battery management systems, and infotainment power rail protection requiring stable component supply and long-term lifecycle support.
Supply support for SMF4L7.5AQ 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 components for automotive, industrial, and computing markets.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient suppression in harsh automotive environments-including engine control, ADAS, and electrified powertrain subsystems.
FAQ
Is SMF4L7.5AQ bidirectional or unidirectional?
SMF4L7.5AQ is unidirectional, indicated by the absence of "C" in its part number (vs. SMF4L7.5CAQ). It conducts only during reverse-biased overvoltage events, with cathode marked by a band. This configuration is optimized for DC power rail protection where polarity is fixed and forward conduction must be blocked.
What is the maximum clamping voltage at 31A surge current?
The maximum clamping voltage (VC) for SMF4L7.5AQ is 12.9V at 31A peak pulse current (10/1000µs waveform), as specified in the Electrical Characteristics table. This value is guaranteed across –55°C to +175°C and defines the upper voltage limit imposed on protected circuitry during worst-case surge conditions.
Can SMF4L7.5AQ replace SMAJ7.5A in existing designs?
Yes, SMF4L7.5AQ is a drop-in replacement for SMAJ7.5A in most cases, offering identical electrical ratings (VRWM, VBR, VC, PPK) and AEC-Q101 qualification. However, its DO-219AA package requires updated land pattern and stencil design due to smaller dimensions and different lead geometry compared to DO-214AC.
Does SMF4L7.5AQ meet automotive ESD standards?
Yes-SMF4L7.5AQ meets IEC61000-4-2 Level 4 for both air discharge (±30kV) and contact discharge (±30kV), as confirmed in the product summary. Its low dynamic impedance and sub-1ns response ensure effective suppression of ESD events encountered during vehicle assembly, service, and end-user interaction.
SMF4L7.5AQ-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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.3V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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
SMF4L7.5AQ-7 FAQ
1.How can I place an order for SMF4L7.5AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L7.5AQ-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 SMF4L7.5AQ-7 reliable?
The price and inventory of SMF4L7.5AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L7.5AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L7.5AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L7.5AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L7.5AQ-7?
SMF4L7.5AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L7.5AQ-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 SMF4L7.5AQ-7?
For technical support, including SMF4L7.5AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L7.5AQ-7 requirements.
6.How does Aetrix verify that SMF4L7.5AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L7.5AQ-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 SMF4L7.5AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L7.5AQ-7?
All SMF4L7.5AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L7.5AQ-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 SMF4L7.5AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L7.5AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L7.5AQ-7 Tags
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