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Diodes Incorporated SMF4L22AQ-7
- Part No.:
- SMF4L22AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L22AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,731
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Product details
Overview
SMF4L22AQ-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in DO-219AA package, rated for 22 V working peak reverse voltage (VRWM), 24.4–27.0 V breakdown voltage (VBR), and 35.5 A maximum reverse surge current (IRSM) under 10/1000 µs waveform. It delivers 400 W peak pulse power dissipation and clamps to ≤35.5 V at rated surge, targeting automotive battery line and power rail protection.
For engineers reviewing the SMF4L22AQ-7 datasheet, SMF4L22AQ-7 pinout, SMF4L22AQ-7 application, or SMF4L22AQ-7 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC rating, IEC 61000-4-2 ±30 kV ESD capability, AEC-Q101 qualification status, and DO-219AA thermal resistance (RθJA = 96 °C/W) in compact PCB layouts.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 24.4 V minimum breakdown threshold. Its fast response (<1.0 ns from 0 V to VBR) ensures suppression before downstream ICs experience overvoltage stress during ISO 7637-2 pulse 1/2a/5a transients or ESD events.
Designed for surface-mount placement on high-reliability automotive power nets, it features a cathode band marking, 0.016 g mass, and RoHS-compliant matte tin terminals solderable per MIL-STD-202. Thermal performance is specified with 2 oz. Cu pad layout on FR-4, supporting 1.0 W steady-state dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's nominal rail. |
| VBR (min/max) | 24.4 V / 27.0 V - Breakdown occurs within this range at 1 mA test current; defines turn-on consistency across temperature and unit variance. |
| VC @ IRSM | 35.5 V - Clamping voltage measured at 35.5 A peak surge (10/1000 µs); must remain below protected IC's absolute maximum rating. |
| PPK | 400 W - Peak pulse power handling capacity; determines survivability against standardized automotive load dump and ESD pulses. |
| IR @ VRWM | 0.5 µA - Reverse leakage at 22 V; low value minimizes standby power loss in always-on battery circuits. |
| ESD Rating | ±30 kV contact & air (IEC 61000-4-2) - Confirmed immunity level for human-body-model discharge events in assembly and field environments. |
| AEC-Q101 | Qualified - Validated for automotive underhood and cabin applications per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
Package: DO-219AA - Surface-mount, flat lead, 2-terminal plastic-molded 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 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to ground or return path | Connected to system GND or chassis; forms current path during reverse-biased clamping event. |
| Cathode | High-side connection to protected line | Connected to +22 V rail (e.g., automotive battery feed); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against ISO 7637-2 load dump and coupled transients without thermal runaway. |
| AEC-Q101 qualified & PPAP capable | Meets automotive quality system requirements for production release and long-term supply continuity. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary ESD components on board-level interfaces exposed to handling or user contact. |
| DO-219AA footprint with 96 °C/W RθJA | Supports high-density routing and thermal management on space-constrained automotive PCBs. |
| Halogen- and antimony-free "Green" construction | Complies with EU RoHS 3 (2015/863/EU) and automotive environmental directives without compromising surge performance. |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Supply Input |
|---|---|
|
Use Scenario: Protects 22 V-rated microcontroller power rails from battery line transients during engine cranking or alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between fused battery input and DC-DC converter input capacitor. Use Value: Clamps surges to ≤35.5 V within <1.0 ns, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies downstream. |
Use Scenario: Shields USB-C PD and display power inputs in head units from hot-plug ESD and cable-induced noise. IC Role / Device Role / Timing Role: First-line transient suppressor on 12–24 V input stage prior to buck regulator and LDOs. Use Value: Withstands ±30 kV contact ESD per IEC 61000-4-2 while maintaining <0.5 µA leakage to preserve sleep-mode current budget. |
| ADAS Camera Module Power Input | Electric Power Steering (EPS) Sensor Interface |
|
Use Scenario: Guards image sensor and ISP power rails in rear-view or surround-view cameras mounted near vehicle exterior. IC Role / Device Role / Timing Role: Mounted directly at connector entry point on 22 V camera power feed. Use Value: 400 W pulse rating handles ISO 16750-2 jump-start surges; DO-219AA size fits tight board edge constraints. |
Use Scenario: Protects torque and position sensor signal conditioning circuitry from coupled transients on 22 V EPS motor driver supply. IC Role / Device Role / Timing Role: Placed adjacent to isolated CAN transceiver power pins and analog front-end regulators. Use Value: AEC-Q101 qualification ensures reliability across -40°C to +125°C ambient; low clamping voltage preserves analog accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | DO-214AC package; higher RθJA (110 °C/W); 35.5 V VC same, but 3.0 W steady-state PD vs. 1.0 W. | Larger footprint; less suitable for ultra-dense automotive modules; better for industrial PCBs with larger copper areas. | Select SMAJ22A only if DO-214AC is already standardized in design and thermal margin allows higher junction rise. |
| TPSMD22A | Texas Instruments part; same DO-219AA package; identical VRWM/VBR/VC specs; AEC-Q101 qualified; 0.5 µA IR. | Drop-in compatible in layout and function; differs only in manufacturer-specific process and traceability documentation. | Prefer TPSMD22A when TI sourcing preference applies or dual-sourcing strategy requires second-source validation. |
Compared with SMAJ22A and TPSMD22A, SMF4L22AQ-7 offers optimal balance of ultra-compact DO-219AA size, industry-leading 0.016 g mass, and full automotive qualification-making it preferred for next-gen ADAS and body electronics where board space and weight are constrained.
Availability
SMF4L22AQ-7 is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power inputs, and ADAS camera protection requiring stable component supply across multi-year vehicle production cycles.
Supply support for SMF4L22AQ-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 devices, with manufacturing certified to IATF 16949 and product lines focused on automotive, industrial, and consumer power management.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio designed specifically for high-reliability 12 V/24 V automotive power rail protection, emphasizing low clamping, fast response, and green packaging compliance.
FAQ
What is the polarity configuration of SMF4L22AQ-7?
SMF4L22AQ-7 is a unidirectional TVS diode, identified by a visible cathode band on the DO-219AA package. The cathode connects to the protected 22 V line, and the anode connects to ground. This configuration blocks forward conduction and clamps only during reverse overvoltage events.
Does SMF4L22AQ-7 meet automotive qualification standards?
Yes, SMF4L22AQ-7 is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. It has passed high-temperature operating life (HTOL), temperature cycling (TCT), and ESD testing per AEC-Q101 Rev D, making it suitable for under-hood and cabin automotive applications.
How does the DO-219AA package affect thermal performance?
The DO-219AA package provides RθJA = 96 °C/W when mounted on a 1" × 1" FR-4 board with 2 oz. copper pads. Its low profile (0.60 mm height) and optimized thermal path from die to solder joint (RθJS = 70 °C/W) enable efficient heat dissipation in space-limited automotive modules without requiring thermal vias.
Can SMF4L22AQ-7 replace older SMAJ22A in existing designs?
SMF4L22AQ-7 can replace SMAJ22A electrically (same VRWM, VBR, VC, and PPK), but requires PCB footprint revision due to DO-219AA vs. DO-214AC. Layout change is necessary; thermal and ESD performance improves, but mechanical mounting and reflow profile must be revalidated per J-STD-020 Level 1.
SMF4L22AQ-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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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
SMF4L22AQ-7 FAQ
1.How can I place an order for SMF4L22AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L22AQ-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 SMF4L22AQ-7 reliable?
The price and inventory of SMF4L22AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L22AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L22AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L22AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L22AQ-7?
SMF4L22AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L22AQ-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 SMF4L22AQ-7?
For technical support, including SMF4L22AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L22AQ-7 requirements.
6.How does Aetrix verify that SMF4L22AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L22AQ-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 SMF4L22AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L22AQ-7?
All SMF4L22AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L22AQ-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 SMF4L22AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L22AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L22AQ-7 Tags
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