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Diodes Incorporated SMF4L75AQ-7
- Part No.:
- SMF4L75AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L75AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:6,998
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Product details
Overview
SMF4L75AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection in power rails and signal lines. It features a 75V working peak reverse voltage (VRWM), 83.3–92.1V breakdown voltage (VBR), 121V maximum clamping voltage (VC) at 3.3A surge current, and AEC-Q101 qualification for under-hood and battery-contact applications.
For engineers reviewing the SMF4L75AQ-7 datasheet, SMF4L75AQ-7 pinout, SMF4L75AQ-7 application, or SMF4L75AQ-7 equivalent, key selection criteria include clamping performance at 3.3A, unidirectional polarity, DO-219AA package thermal resistance (RθJA = 96°C/W), and IEC 61000-4-2 ±30kV ESD robustness - all critical for automotive power management and battery interface design.
Technical Context
This TVS operates as a fast-acting shunt clamp during transients, with sub-1ns response time for unidirectional devices. Its silicon avalanche structure enables precise VBR tolerance (±10% typical) and stable clamping across temperature (-55°C to +175°C).
The device uses a planar junction in a molded DO-219AA package with matte tin terminals, optimized for high surge current handling (400W, 10/1000µs waveform) while maintaining low junction-to-ambient thermal resistance and compatibility with automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 75V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above nominal 60V automotive system rails. |
| VBR (min/max) | 83.3V / 92.1V - Breakdown occurs within this range at 1mA test current; ensures predictable turn-on during transients. |
| VC @ IRSM | 121V at 3.3A - Clamping voltage limits downstream IC stress during ISO 7637-2 pulse 1/2a/5a events. |
| PPK | 400W - Peak pulse power rating per 10/1000µs waveform; supports robust protection against load dump and inductive switching spikes. |
| ESD Rating | ±30kV contact/air (IEC 61000-4-2) - Enables direct placement on exposed connectors without external shielding. |
| Operating Temp | -55°C to +175°C - Validated for under-hood environments including engine control units and battery management systems. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics, including HTGB, HTRB, and TCT. |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount plastic package (2.80mm × 1.90mm × 0.60mm), RoHS-compliant, halogen-free, with cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected line | Connected to ground or return path; forms current sink during transient clamping. |
| Cathode | High-side connection to protected line | Connected to supply rail or signal line; blocks reverse leakage (<0.5µA at 75V) in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Withstands 10/1000µs surges up to 3.3A without degradation - sufficient for ISO 7637-2 Pulse 5a (load dump) in 12V/24V systems. |
| Fast response time | <1.0ns from 0V to VBR - prevents voltage overshoot beyond protected IC's absolute maximum ratings. |
| AEC-Q101 qualification | Validated for automotive use with PPAP documentation support and IATF 16949 manufacturing - reduces qualification effort for Tier 1 suppliers. |
| DO-219AA footprint | 0.016g weight and 2.8mm × 1.9mm outline - enables high-density layout near connectors and ECUs without thermal crowding. |
| ±30kV ESD protection | Fully complies with IEC 61000-4-2 Level 4 - eliminates need for secondary ESD components on CAN, LIN, or sensor interfaces. |
Applications
| Automotive Power Rail Protection | Battery Contact Interface |
|---|---|
|
Use Scenario: 12V/24V vehicle power distribution networks exposed to load dump, jump-start, and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery+ and chassis ground to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 121V at 3.3A, protecting downstream 100V-rated MOSFETs and PMICs without derating. |
Use Scenario: Direct battery terminal connections in start-stop systems and battery management modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp at physical battery interface, absorbing ESD and hot-swap transients before entering fuse box or BMS ASIC. Use Value: Withstands ±30kV contact ESD and 400W surges while maintaining <0.5µA leakage at 75V - preserves battery standby current budget. |
| Engine Control Unit (ECU) Input Protection | Body Control Module (BCM) Sensor Lines |
|
Use Scenario: 5V/3.3V supply inputs to engine control units subjected to cranking dips and ignition noise. IC Role / Device Role / Timing Role: Secondary TVS after primary LC filter, providing fast-response clamping for residual spikes that pass filtering. Use Value: Sub-1ns response ensures clamping occurs before 5V LDOs or MCU IO pins experience overvoltage stress during cranking transients. |
Use Scenario: LIN bus and analog sensor inputs (e.g., temperature, pressure) in body control modules. IC Role / Device Role / Timing Role: Signal-line TVS placed at connector entry point to suppress coupled transients from nearby high-current loads. Use Value: Low capacitance (typ. 100pF at 1MHz) avoids signal integrity degradation on 20kbps LIN lines while delivering full ±30kV ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Same VRWM (75V), but SMA package (larger footprint, RθJA = 110°C/W), lower PPK (400W same), higher VC (123V @ 3.3A) | Less suitable for space-constrained automotive modules; requires larger PCB area and has reduced thermal margin. | Select when legacy SMA footprint compatibility is required and board space allows. |
| 1.5SMC75A | Higher PPK (1500W), DO-214AB package, slower response (~5ns), higher VC (129V @ 12.3A) | Designed for industrial surge suppression (IEC 61000-4-5), not optimized for automotive ESD or compact layout. | Select only for high-energy lightning/surge applications where size and speed are secondary to energy handling. |
Compared with SMAJ75A and 1.5SMC75A, SMF4L75AQ-7 delivers superior thermal performance (RθJA = 96°C/W), smaller DO-219AA footprint, and faster response - making it the preferred choice for modern automotive ECUs, BCMs, and battery interfaces where space, speed, and AEC-Q101 compliance are mandatory.
Availability
SMF4L75AQ-7 is available at Aetrix Electronics and suitable for automotive power management, battery contact protection, and engine control unit (ECU) input conditioning requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMF4L75AQ-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design and manufacturing facilities certified to IATF 16949 and AEC-Q101 standards.
The SMF4L series belongs to Diodes' automotive-qualified TVS portfolio, engineered specifically for robust transient suppression in harsh vehicle environments - emphasizing low clamping voltage, fast response, and long-term reliability under thermal cycling and humidity exposure.
FAQ
What is the maximum clamping voltage of SMF4L75AQ-7 and at what test current?
The maximum clamping voltage (VC) is 121V, measured at a peak reverse surge current (IRSM) of 3.3A using the 10/1000µs standard waveform. This value is guaranteed across the full operating temperature range (-55°C to +175°C) and defines the upper voltage limit imposed on protected circuits during transient events.
Is SMF4L75AQ-7 suitable for bidirectional signal line protection?
No - SMF4L75AQ-7 is a unidirectional TVS diode, identified by its cathode band marking. For bidirectional protection (e.g., on AC-coupled or differential lines), the bi-directional variant SMF4L75CAQ-7 must be used, which exhibits symmetrical clamping in both polarities and double the reverse leakage specification.
How does the DO-219AA package improve thermal performance over SMA or SMB packages?
The DO-219AA package achieves RθJA = 96°C/W (vs. ~110°C/W for SMAJ and ~130°C/W for SMB), due to its optimized copper leadframe geometry and low-profile thermal path to the PCB. This enables higher sustained surge capability in compact layouts and better reliability under repeated transient stress in automotive under-hood applications.
Does SMF4L75AQ-7 require derating for operation above +25°C ambient?
Yes - peak pulse power must be linearly derated above +25°C per Figure 1 in DS43393. At +125°C ambient, the 400W rating drops to approximately 200W. Designers must verify clamping performance under worst-case thermal conditions using the published derating curve and ensure PCB copper area meets the 1"×1" FR-4, 2 oz. Cu reference layout for rated thermal resistance.
SMF4L75AQ-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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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
SMF4L75AQ-7 FAQ
1.How can I place an order for SMF4L75AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L75AQ-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 SMF4L75AQ-7 reliable?
The price and inventory of SMF4L75AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L75AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L75AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L75AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L75AQ-7?
SMF4L75AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L75AQ-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 SMF4L75AQ-7?
For technical support, including SMF4L75AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L75AQ-7 requirements.
6.How does Aetrix verify that SMF4L75AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L75AQ-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 SMF4L75AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L75AQ-7?
All SMF4L75AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L75AQ-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 SMF4L75AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L75AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L75AQ-7 Tags
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