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Diodes Incorporated SMF4L90A-7
- Part No.:
- SMF4L90A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L90A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,616
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Product details
Overview
SMF4L90A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 90V working peak reverse voltage (VRWM), 100–111V breakdown voltage range (VBR), and clamps up to 146V at 2.7A peak surge current - enabling reliable protection of automotive ECUs, battery management systems, and industrial I/O interfaces against ESD and lightning-induced transients.
For engineers reviewing the SMF4L90A-7 datasheet, SMF4L90A-7 pinout, SMF4L90A-7 application, or SMF4L90A-7 equivalent, key selection criteria include its DO-219AA package footprint, 146V clamping voltage at 2.7A, ±30kV IEC61000-4-2 ESD rating, and suitability for AEC-Q101-compliant automotive designs requiring high surge immunity in space-constrained layouts.
Technical Context
This TVS operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<1.0ns) and low clamping ratio (VC/VBR ≈ 1.46). Its junction design delivers stable 90V standoff while maintaining <0.5µA reverse leakage at VRWM - critical for low-power sensor and microcontroller supply rail protection.
The device uses a planar silicon junction structure in a molded DO-219AA package with matte tin-plated copper alloy leads, achieving 96°C/W junction-to-ambient thermal resistance on standard FR-4 PCBs. It complies with JEDEC reliability standards and supports IATF 16949 manufacturing traceability for automotive-grade deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 90V - maximum continuous reverse operating voltage before conduction begins; sets safe operating margin for 72–96V automotive battery systems. |
| VBR (min/max) | 100V / 111V @ 1mA - defines precise avalanche onset window; ensures predictable turn-on during transients without premature triggering. |
| VC (max) | 146V @ 2.7A - clamping voltage under 10/1000µs surge; limits downstream IC stress to safe levels during ISO 7637-2 pulse 1/2/5a events. |
| PPK | 400W - peak pulse power handling per 10/1000µs waveform; supports repeated surge suppression in engine control and ADAS modules. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - eliminates need for external ESD diodes in USB, CAN, and LIN interface protection circuits. |
| IR @ VRWM | 0.5µA - ultra-low reverse leakage; preserves battery life in always-on telematics and remote keyless entry receivers. |
| Package | DO-219AA - 2.8mm × 1.9mm surface-mount outline with 0.6mm lead length; enables high-density placement near connectors and power entry points. |
Pinout & Package
SMF4L90A-7 is housed in the DO-219AA surface-mount package: a compact, halogen-free molded plastic case with matte tin-plated copper alloy leads, UL 94V-0 rated, and moisture sensitivity level 1. The cathode band denotes the unidirectional polarity - anode connects to protected line, cathode to ground or higher-potential rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Protected Line Input | Connected to the circuit node requiring transient suppression (e.g., battery feed, CAN_H, or sensor VDD). |
| Cathode (banded end) | Clamp Reference Node | Typically tied to system ground or a stable reference; determines clamping threshold and directionality. |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables single-device protection against ISO 7637-2 Pulse 5a (500V/10Ω) surges in 12V automotive systems without derating. |
| Fast Response Time | <1.0ns turn-on latency ensures clamping initiates before sensitive logic or analog front-ends are exposed to damaging voltage overshoot. |
| Low Clamping Ratio | VC/VBR = 1.46 maximizes margin between clamping voltage and downstream IC absolute maximum ratings (e.g., 16V-rated MCU I/O). |
| AEC-Q101 Qualified | Validated for automotive use including temperature cycling (-55°C to +175°C), HTRB, and ESD stress - supports PPAP documentation for Tier 1 suppliers. |
| Green Construction | Halogen- and antimony-free molding compound (<900ppm Br+Cl, <1000ppm Sb) meets automotive OEM environmental compliance requirements. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting 12V supply inputs of BCM microcontrollers from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping positive-going surges on VBAT rail before they reach LDO regulators and MCU power pins. Use Value: Prevents brownout resets and latch-up by limiting voltage to ≤146V during 120V/350ms load dump events per ISO 16750-2. |
Use Scenario: Safeguarding 24V digital input channels of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff diode placed between terminal block and optocoupler input, absorbing fast transients before isolation barrier. Use Value: Maintains functional safety integrity by ensuring optocoupler LED remains within 30V reverse rating during 1kV/500Ω surge tests (IEC 61000-4-5). |
| USB-C Power Delivery Port | Battery Management System (BMS) Cell Monitor |
|
Use Scenario: Suppressing ESD and hot-swap transients on USB-C VBUS lines in portable docking stations. IC Role / Device Role / Timing Role: Primary clamp on 5–20V VBUS path, coordinated with upstream eFuse and downstream PD controller. Use Value: Passes ±30kV IEC61000-4-2 contact discharge without degradation, eliminating need for secondary TVS cascading. |
Use Scenario: Shielding precision cell voltage monitoring ICs from battery pack-level switching noise and fault currents. IC Role / Device Role / Timing Role: Localized TVS on each cell sense line (e.g., between BQ769x2 input and battery tab), referenced to local ground plane. Use Value: Limits transient-induced offset error to <1mV during 100A short-circuit events, preserving SOC estimation 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 |
|---|---|---|---|
| SMAJ90A | Same DO-214AC package; 400W rating but higher VC (150V) and larger footprint (4.5×2.7mm vs. 2.8×1.9mm). | Less suitable for ultra-dense layouts; requires 2.5× more PCB area than SMF4L90A-7. | Choose SMAJ90A only when legacy board space allows and DO-219AA rework is impractical. |
| TPSMF90A | Same DO-219AA package; identical electrical specs but qualified to AEC-Q101 Grade 0 (−40°C to +175°C) with enhanced HTGB testing. | Required for under-hood applications exceeding +125°C ambient, such as engine control units. | Specify TPSMF90A for high-temperature zones where extended lifetime validation is mandated. |
Compared with SMAJ90A and TPSMF90A, SMF4L90A-7 offers optimal balance of miniaturization, automotive qualification, and cost efficiency for cabin-located electronics - delivering identical surge performance in 45% less board area than SMAJ90A and at lower unit cost than TPSMF90A for non-extreme-temperature use cases.
Availability
SMF4L90A-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, and USB-C power delivery ports requiring stable component supply across multi-year production cycles.
Supply support for SMF4L90A-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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and consumer markets.
The SMF4L series belongs to Diodes' automotive-qualified TVS portfolio, engineered specifically for space-constrained, high-surge environments where AEC-Q101 compliance, low clamping voltage, and ultra-fast response are mandatory.
FAQ
What is the maximum clamping voltage of SMF4L90A-7 under surge conditions?
The maximum clamping voltage (VC) is 146V at 2.7A peak pulse current using the 10/1000µs waveform. This value is guaranteed across the full operating temperature range (−55°C to +175°C) and represents the upper limit of voltage seen by downstream components during transient events.
Is SMF4L90A-7 suitable for bidirectional signal line protection?
No - SMF4L90A-7 is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection (e.g., RS-485, CAN bus), the SMF4L90CA variant must be used, which has symmetrical breakdown characteristics and no polarity marking.
Does SMF4L90A-7 require derating at elevated ambient temperatures?
Yes - its peak pulse power must be linearly derated above +25°C ambient, following the curve in Figure 1 of DS43394. At +85°C, it retains ~70% of rated 400W capability (280W), and at +125°C, ~45% (180W), based on junction-to-ambient thermal resistance of 96°C/W.
Can SMF4L90A-7 be used in parallel for higher surge current handling?
No - paralleling TVS diodes is not recommended due to mismatched VBR tolerances (±10%), which causes uneven current sharing and potential thermal runaway. For >2.7A surge requirements, select a higher-rated part like SMF4L100A-7 (162W clamping at 2.5A) or verify layout-based current division with SPICE simulation.
SMF4L90A-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L90A-7 FAQ
1.How can I place an order for SMF4L90A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L90A-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 SMF4L90A-7 reliable?
The price and inventory of SMF4L90A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L90A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L90A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L90A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L90A-7?
SMF4L90A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L90A-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 SMF4L90A-7?
For technical support, including SMF4L90A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L90A-7 requirements.
6.How does Aetrix verify that SMF4L90A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L90A-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 SMF4L90A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L90A-7?
All SMF4L90A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L90A-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 SMF4L90A-7 part is unused and in its original packaging.
Return procedure for SMF4L90A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L90A-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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