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Diodes Incorporated SMF4L26AQ-7
- Part No.:
- SMF4L26AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L26AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,950
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Product details
Overview
SMF4L26AQ-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for automotive-grade overvoltage protection in power rails and battery interfaces. It features a 26V working peak reverse voltage (VRWM), 28.9V minimum breakdown voltage (VBR), 42.1A maximum peak pulse current (IPP), and clamps to ≤42.1V at rated surge, meeting AEC-Q101 qualification for under-hood and battery-contact applications.
For engineers reviewing the SMF4L26AQ-7 datasheet, SMF4L26AQ-7 pinout, SMF4L26AQ-7 application, or SMF4L26AQ-7 equivalent, key selection criteria include clamping voltage margin vs. system rail tolerance, IEC61000-4-2 ±30kV ESD robustness, DO-219AA footprint compatibility, and thermal performance under repetitive surge conditions in automotive power management circuits.
Technical Context
This TVS diode operates as a unidirectional clamp between power rail and ground, activating when reverse voltage exceeds VBR (28.9–31.9V) to divert transient energy while limiting VC to 42.1V at IPP = 42.1A (10/1000µs waveform). Its sub-1ns response time ensures protection against fast ESD events before downstream ICs are damaged.
Thermal design relies on low junction-to-solder-point resistance (RθJS = 70°C/W) and 1.0W DC power dissipation capability on standard FR-4 PCBs. The device is rated for continuous operation from –55°C to +175°C and supports PPAP documentation for automotive OEM programs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26V - Maximum steady-state reverse voltage before clamping begins; sets safe operating margin above 24V automotive nominal rail. |
| VBR (min) | 28.9V - Minimum breakdown voltage at 1mA test current; defines earliest activation threshold for transients. |
| VC (max) | 42.1V - Maximum clamped voltage at 42.1A peak pulse; determines worst-case stress on protected ICs. |
| IPP (max) | 42.1A - Peak pulse current handling at 10/1000µs waveform; quantifies surge energy absorption capacity. |
| ESD Rating | ±30kV contact/air per IEC61000-4-2 - Confirms immunity to human-body-model and system-level ESD events. |
| Package | DO-219AA - 2-pin surface-mount package with 1.9mm width, 2.8mm length, and 0.6mm height; optimized for high-density automotive PCB layouts. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and surge endurance per AEC stress test plan. |
Pinout & Package
Package: DO-219AA - ultra-compact, flat-lead, molded plastic case with matte tin-plated copper alloy leads; cathode band denotes unidirectional polarity; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system GND; forms low-impedance return path during clamping event. |
| Cathode | Protected line input | Connected to 24V rail or battery feed; reverse-biased during normal operation; conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Supports high-energy transients (e.g., ISO 7637-2 Pulse 1/2/5a) without degradation on 24V systems. |
| Fast response time | <1.0ns turn-on delay ensures protection against nanosecond-scale ESD and switching noise. |
| AEC-Q101 qualification | Validated for automotive under-hood environments including 1000h HTOL, temperature cycling, and surge life testing. |
| Green, halogen-free construction | Meets RoHS 3 (2015/863/EU) and automotive "Green" definition: Br+Cl <1500ppm, Sb <1000ppm. |
| Low clamping ratio (VC/VBR) | 1.46 (42.1V / 28.9V) - tight clamping minimizes overvoltage stress on downstream 30V-rated components. |
Applications
| Automotive Power Rail Protection | Battery Contact ESD Suppression |
|---|---|
|
Use Scenario: 24V supply line feeding body control module (BCM) or ADAS camera ECU exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp transients before they reach LDOs and microcontrollers. Use Value: Limits clamped voltage to 42.1V, staying within 30V IC absolute maximum ratings while absorbing up to 42.1A surge current. |
Use Scenario: Direct connection point between vehicle battery terminal and onboard charger or telematics unit. IC Role / Device Role / Timing Role: First-line defense against ±30kV contact ESD per IEC61000-4-2 during service or assembly. Use Value: Sub-1ns response prevents ESD-induced latch-up or gate oxide damage in sensitive analog front-ends and CAN transceivers. |
| Industrial 24V PLC Input Protection | EV Onboard Charger DC Link Clamp |
|
Use Scenario: Digital input channel of programmable logic controller interfacing with field sensors in factory automation. IC Role / Device Role / Timing Role: Standoff protection element on 24V optocoupler input side, shunting induced lightning surges. Use Value: Withstands 400W pulses without derating at 85°C ambient, enabling reliable operation in enclosed control cabinets. |
Use Scenario: DC bus monitoring node in 400V EV onboard charger where 24V auxiliary rail interfaces with high-voltage isolation barrier. IC Role / Device Role / Timing Role: Secondary clamp protecting isolated DC-DC converter feedback path from coupling transients across transformer. Use Value: DO-219AA footprint allows placement adjacent to isolation boundary with minimal parasitic inductance, preserving clamping speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same VRWM (26V), but SMA package (larger DO-214AC); 400W rating; VC = 42.1V; slower thermal response due to higher RθJA (100°C/W). | Less suitable for high-density automotive modules; requires larger PCB area and exhibits higher junction temperature rise under repeated surges. | Select if legacy SMA footprint compatibility is required and space constraints are less critical than thermal cycling endurance. |
| 1.5SMC27A | Higher VRWM (27V), DO-214AB package; 1500W rating; VC = 43.5V; not AEC-Q101 qualified; no IEC61000-4-2 certification. | Intended for industrial power supplies, not automotive; lacks PPAP support and automotive reliability validation. | Choose only for non-automotive 24V systems where cost is prioritized over qualification and ESD compliance. |
Compared with SMAJ26A and 1.5SMC27A, SMF4L26AQ-7 delivers superior board-space efficiency, automotive-grade reliability, and guaranteed ±30kV ESD performance-making it the optimal choice for next-generation compact, safety-critical 24V electronic control units.
Availability
SMF4L26AQ-7 is available at Aetrix Electronics and suitable for automotive power management, battery-contact ESD suppression, and industrial 24V PLC input protection requiring stable component supply across multi-year production cycles.
Supply support for SMF4L26AQ-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMF4L series belongs to Diodes' AEC-Q101-qualified TVS portfolio, engineered specifically for automotive power rail and interface protection where space, reliability, and ESD immunity are critical design constraints.
FAQ
What is the polarity configuration of SMF4L26AQ-7?
SMF4L26AQ-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only when reverse-biased beyond its breakdown voltage (28.9V min), making it suitable for DC power rail protection where polarity is fixed and ground-referenced clamping is required.
Does SMF4L26AQ-7 meet automotive qualification standards?
Yes, SMF4L26AQ-7 is AEC-Q101 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable. It undergoes full automotive stress testing including high-temperature operating life, temperature cycling, and surge endurance, supporting deployment in engine control units, body electronics, and ADAS subsystems.
How does the DO-219AA package affect thermal performance?
The DO-219AA package provides a junction-to-solder-point thermal resistance (RθJS) of 70°C/W, significantly lower than legacy SMA or SMB packages. This enables efficient heat transfer to the PCB copper pour, allowing sustained operation at 85°C ambient with minimal derating-critical for sealed automotive enclosures.
Can SMF4L26AQ-7 replace older SMF series devices in existing designs?
Yes, SMF4L26AQ-7 is a direct functional and mechanical replacement for legacy SMF26A devices in DO-219AA footprint, offering identical electrical specs plus enhanced ESD rating (±30kV vs. ±25kV) and tighter clamping (VC = 42.1V). No layout changes are needed, and qualification retesting is minimized due to identical AEC-Q101 stress profiles.
SMF4L26AQ-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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- 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
SMF4L26AQ-7 FAQ
1.How can I place an order for SMF4L26AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L26AQ-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 SMF4L26AQ-7 reliable?
The price and inventory of SMF4L26AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L26AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L26AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L26AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L26AQ-7?
SMF4L26AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L26AQ-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 SMF4L26AQ-7?
For technical support, including SMF4L26AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L26AQ-7 requirements.
6.How does Aetrix verify that SMF4L26AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L26AQ-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 SMF4L26AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L26AQ-7?
All SMF4L26AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L26AQ-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 SMF4L26AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L26AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L26AQ-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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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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