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Diodes Incorporated SMF4L90AQ-7
- Part No.:
- SMF4L90AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L90AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,076
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Product details
Overview
SMF4L90AQ from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive power rails and battery interfaces. It features a 90V working peak reverse voltage (VRWM), 100V minimum breakdown voltage (VBR), 146V maximum clamping voltage (VC) at 2.7A, and 400W peak pulse power dissipation (10/1000µs waveform). It is AEC-Q101 qualified and RoHS-compliant.
For engineers reviewing the SMF4L90AQ datasheet, SMF4L90AQ pinout, SMF4L90AQ application, or SMF4L90AQ equivalent, key selection criteria include clamping performance under 2.7A surge current, unidirectional polarity for DC rail protection, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with IEC61000-4-2 ±30kV contact/air ESD.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (100–111V), it avalanches to divert surge current away from downstream circuitry. Its fast response time (<1.0ns from 0V to VBR) ensures protection before sensitive components experience overvoltage stress.
The device is optimized for automotive-grade reliability-manufactured in IATF 16949-certified facilities, PPAP-capable, and rated for operation from −55°C to +175°C. Its DO-219AA package enables low-inductance mounting and efficient heat transfer via cathode tab soldering to PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 90V - Maximum continuous reverse operating voltage before leakage exceeds 5μA; sets upper limit for protected DC rail voltage. |
| VBR (min) | 100V - Minimum voltage at which avalanche conduction begins (measured at 1mA); defines turn-on threshold under surge conditions. |
| VC (max) | 146V - Maximum clamped voltage at 2.7A peak surge current; determines worst-case overvoltage seen by protected ICs. |
| PPK | 400W - Peak pulse power handling (10/1000µs waveform); supports robust protection against ISO 7637-2 Pulse 1/2a/5a transients. |
| IR @ VRWM | 0.5μA - Reverse leakage at rated standoff voltage; ensures minimal quiescent power loss in always-on battery circuits. |
| TJ Range | −55°C to +175°C - Junction temperature range; validates suitability for under-hood automotive environments. |
| RθJA | 96°C/W - Thermal resistance junction-to-ambient on 1"×1" FR-4 board; informs derating requirements for sustained power dissipation. |
Pinout & Package
Package: DO-219AA surface-mount molded plastic case (UL 94V-0), 2.80mm × 1.90mm footprint, 3.80mm height, 0.016g weight. Cathode band denotes unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to power rail or signal line requiring surge suppression; referenced to ground through cathode path during clamping. |
| Cathode | Ground reference terminal | Soldered directly to PCB ground plane or thermal pad; serves as primary heat-sinking path (RθJS = 70°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 ESD rating | ±30kV air, ±30kV contact - Enables single-device compliance for automotive infotainment and body control module ESD immunity testing. |
| AEC-Q101 qualification | Qualified per stress test standard for discrete semiconductors - Confirms reliability for automotive powertrain and chassis applications. |
| Fast response time | <1.0ns (0V to VBR) - Limits voltage overshoot during nanosecond-scale ESD events, protecting high-speed CAN/LIN transceivers. |
| Green construction | Halogen- and antimony-free, RoHS 3 compliant - Meets EU environmental directives and OEM sustainability requirements. |
| Low clamping ratio | VC/VRWM = 1.62 - Delivers tight voltage margin between operating rail and clamping level, reducing risk of overvoltage damage to 12V/24V systems. |
Applications
| Automotive Power Distribution | Battery Management Systems |
|---|---|
Use Scenario: Protection of 12V/24V supply lines feeding ADAS ECUs, lighting modules, and gateway controllers against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps ISO 7637-2 Pulse 5a (75V/100ms) to ≤146V, preventing latch-up or burnout of upstream PMICs. | Use Scenario: Surge protection on cell monitor IC inputs and pack voltage sensing lines in EV battery packs. IC Role / Device Role / Timing Role: Standoff-rated TVS on high-impedance analog sense paths to suppress coupling from nearby high-current switching. Use Value: 0.5μA leakage at 90V minimizes measurement error in precision voltage monitoring circuits. |
| Infotainment Head Units | Industrial Control Inputs |
Use Scenario: ESD protection on USB, HDMI, and LVDS interfaces exposed to user-accessible ports in vehicle dashboards. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS on VBUS and data lines, grounded to chassis via low-inductance trace. Use Value: Sub-1ns turn-on ensures clamping occurs before ±30kV ESD pulses reach USB PHY transceivers. | Use Scenario: Input protection for PLC digital I/O modules connected to field sensors in harsh industrial environments. IC Role / Device Role / Timing Role: Rail-to-rail TVS on 24V DC input terminals subjected to lightning-induced surges and inductive kickback. Use Value: 400W peak power rating sustains multiple 10/1000µs surges without degradation, supporting long-term field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | DO-214AC package; higher RθJA (120°C/W); 146V VC at 2.6A | Larger footprint; lower thermal efficiency; less suitable for high-density automotive PCBs | Prefer SMF4L90AQ where space and thermal performance are critical. |
| 1.5SMC90A | DO-214AB package; 400W rating; 146V VC at 2.7A; higher VF (3.0V @ 16A) | Higher forward voltage increases power loss during sustained overvoltage; larger body height | Choose SMF4L90AQ for lower profile and superior thermal resistance in constrained layouts. |
Compared with SMAJ90A and 1.5SMC90A, SMF4L90AQ delivers identical clamping performance in a smaller DO-219AA package with 29% lower junction-to-ambient thermal resistance-critical for maintaining reliability in thermally dense automotive modules.
Availability
SMF4L90AQ is available at Aetrix Electronics and suitable for automotive power distribution, battery management systems, infotainment head units, and industrial control inputs requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for SMF4L90AQ 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-grade transient suppression in power management, battery interface, and signal line protection applications.
FAQ
What is the polarity configuration of SMF4L90AQ?
SMF4L90AQ is a unidirectional TVS diode, indicated by a cathode band marking on the DO-219AA package. It conducts only when the anode is more positive than the cathode by ≥100V, making it suitable for DC rail protection where reverse voltage is not expected.
How does SMF4L90AQ perform under repeated surge stress?
Per Diodes' DS43393 Rev. 3–2, SMF4L90AQ maintains clamping performance after multiple 10/1000µs surges up to 400W, provided ambient temperature remains within derated limits (see Fig. 1). Its AEC-Q101 qualification confirms endurance across 1,000 cycles under specified test conditions.
Can SMF4L90AQ be used in bidirectional signal lines?
No-SMF4L90AQ is unidirectional and unsuitable for AC or bidirectional signal lines like RS-485 or CAN. For such applications, the bi-directional variant SMF4L90CAQ (marked TV) must be selected, offering symmetric clamping for ±90V working voltage.
What is the recommended PCB layout for optimal thermal performance?
Diodes recommends a 1" × 1" FR-4 pad with 2 oz. copper for the cathode terminal, per DS43393. The suggested pad layout (X = 1.34mm, Y = 1.80mm, C = 2.86mm) maximizes solder joint area and thermal conduction to internal ground planes, achieving the specified RθJA = 96°C/W.
SMF4L90AQ-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):
- 90V
- Voltage - Breakdown (Min):
- 100V
- Voltage - Clamping (Max) @ Ipp:
- 146V
- Current - Peak Pulse (10/1000µs):
- 2.7A
- 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
SMF4L90AQ-7 FAQ
1.How can I place an order for SMF4L90AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L90AQ-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 SMF4L90AQ-7 reliable?
The price and inventory of SMF4L90AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L90AQ-7 is usually 5 days.
3.What payment methods are accepted for SMF4L90AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L90AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L90AQ-7?
SMF4L90AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L90AQ-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 SMF4L90AQ-7?
For technical support, including SMF4L90AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L90AQ-7 requirements.
6.How does Aetrix verify that SMF4L90AQ-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L90AQ-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 SMF4L90AQ-7 meets industry standards.
7.What is the process for return or replacement of SMF4L90AQ-7?
All SMF4L90AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L90AQ-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 SMF4L90AQ-7 part is unused and in its original packaging.
Return procedure for SMF4L90AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L90AQ-7 Tags
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Diodes Incorporated
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