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Diodes Incorporated SMF4L64A-7
- Part No.:
- SMF4L64A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L64A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:2,095
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Product details
Overview
SMF4L64A-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 64V working peak reverse voltage (VRWM), 71.1–78.6V breakdown range (VBR), 103V maximum clamping voltage (VC) at 3.9A surge current, and sub-1ns response time - deployed in automotive body control modules, industrial sensor interfaces, and battery management systems.
For engineers reviewing the SMF4L64A-7 datasheet, SMF4L64A-7 pinout, SMF4L64A-7 application, or SMF4L64A-7 equivalent, key selection criteria include clamping performance under IEC 61000-4-2 ±30kV ESD stress, DO-219AA package thermal resistance (RθJA = 96°C/W), unidirectional polarity marking (cathode band), and compliance with AEC-Q101 for automotive-grade reliability.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (71.1V min), it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its unidirectional configuration blocks reverse DC voltage up to 64V while clamping positive transients to ≤103V at 3.9A.
Designed for 10/1000µs waveform surges, it delivers 400W peak pulse power dissipation with fast turn-on (<1.0ns typical), low leakage (<0.5µA at VRWM), and stable operation across –55°C to +175°C junction temperature range - validated per JEDEC high-reliability standards and compatible with lead-free reflow profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC blocking level. |
| VBR (min/max) | 71.1V / 78.6V - Breakdown occurs within this range at 1mA test current; ensures predictable turn-on margin above VRWM. |
| VC @ IRSM | 103V @ 3.9A - Clamping voltage during 10/1000µs surge; limits protected circuit voltage stress to safe levels. |
| PPK | 400W - Peak pulse power handling capability; supports high-energy transients without failure. |
| IR @ VRWM | <0.5µA - Reverse leakage at rated working voltage; minimizes standby power loss in battery-powered systems. |
| Response Time | <1.0ns - Time from 0V to VBR onset; enables protection of high-speed digital and analog circuits. |
| Operating Temp | –55°C to +175°C - Junction temperature range; suitable for under-hood automotive and industrial environments. |
Pinout & Package
Package: DO-219AA - ultra-compact surface-mount molded plastic case (1.90 × 2.80 × 3.80 mm), halogen- and antimony-free, RoHS-compliant, moisture sensitivity level 1, matte tin-plated copper alloy leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes current path during positive transient clamping. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 12V rail); cathode band marking identifies polarity for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD Protection | ±30kV air discharge, ±30kV contact discharge - meets highest system-level ESD immunity requirements without external shielding. |
| Clamping Ratio (VC/VBR) | ~1.45 (103V / 71.1V) - tight ratio ensures minimal overvoltage overshoot during surge events. |
| Thermal Resistance (RθJA) | 96°C/W - enables reliable power dissipation on standard FR-4 PCBs without heatsinking. |
| AEC-Q101 Qualified | Qualified per JEDEC high-reliability standards - supports automotive applications requiring PPAP and IATF 16949 traceability. |
| Green Packaging | Halogen- and antimony-free, UL 94V-0 rated molding compound - satisfies environmental compliance for global OEMs. |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protects 12V supply inputs and LIN bus lines in BCMs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp spikes before reaching MCU and driver ICs. Use Value: Prevents latch-up or permanent damage to 3.3V/5V logic supplies by limiting transient voltage to ≤103V during 100V/50ms load dump events. |
Use Scenario: Safeguards CANH/CANL differential pair in factory automation gateways exposed to EFT and surge noise. IC Role / Device Role / Timing Role: Unidirectional TVS on each CAN line referenced to ground; coordinates with common-mode choke for differential-mode suppression. Use Value: Maintains CAN signal integrity by clamping common-mode transients to <103V while preserving <1ns response for fast edge preservation. |
| Battery Management System (BMS) Cell Monitor | Smart Meter Power Input Stage |
Use Scenario: Shields isolated ADC front-end and coupler inputs in multi-cell BMS from battery terminal transients during hot-plug or fault conditions. IC Role / Device Role / Timing Role: Low-leakage (0.5µA) unidirectional TVS placed upstream of isolation barrier to prevent coupling of surge energy into sensitive analog domain. Use Value: Enables accurate cell voltage measurement by eliminating false triggers or offset drift caused by sub-100ns transients on 3.3V monitoring rails. |
Use Scenario: Protects AC/DC converter primary-side input against lightning-induced surges and neutral-ground faults in utility smart meters. IC Role / Device Role / Timing Role: First-stage clamping device on rectified DC bus, coordinated with MOV and fuse for staged overvoltage defense. Use Value: Extends product lifetime by absorbing 400W surge energy without degradation, meeting IEC 61000-4-5 Level 3 (2kV/1kA) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Same VRWM (64V), but lower PPK (400W same), higher VC (104V), DO-214AC package (larger, RθJA = 50°C/W) | Less space-constrained designs; higher thermal mass allows longer surge duration tolerance | Choose SMAJ64A if board layout permits larger footprint and higher thermal inertia is preferred over miniaturization. |
| SMF4L64CA | Bidirectional variant; identical VRWM (64V), VBR, VC, and package; symmetrical clamping for AC or dual-polarity signals | Required for protecting bidirectional data lines (e.g., RS-485, USB D+/D−) or AC-coupled sensors | Choose SMF4L64CA only when transient threats exist on both polarities - unidirectional SMF4L64A offers lower leakage and tighter clamping for DC rails. |
Compared with SMAJ64A, SMF4L64A-7 provides 30% smaller footprint and superior high-frequency response due to lower junction capacitance, while SMF4L64CA trades unidirectional leakage advantage for bidirectional symmetry - making SMF4L64A optimal for compact, low-leakage DC protection.
Availability
SMF4L64A-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial CAN bus interfaces, and battery management systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMF4L64A-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, manufacturing, and distribution operations across Asia, Europe, and the Americas.
SMF4L64A-7 belongs to Diodes' SMF4L series of ultra-compact TVS diodes engineered specifically for space-constrained, high-reliability applications in automotive and industrial electronics where low leakage, fast response, and AEC-Q101 qualification are mandatory.
FAQ
What is the polarity configuration of SMF4L64A-7?
SMF4L64A-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It blocks reverse DC voltage up to 64V and clamps positive transients to ≤103V. The anode connects to ground or the lowest potential node, while the cathode connects to the protected line - critical for correct placement in DC power rail protection.
Does SMF4L64A-7 meet automotive qualification standards?
Yes - SMF4L64A-7 is qualified to AEC-Q101 and JEDEC high-reliability standards, manufactured in IATF 16949-certified facilities. It supports PPAP documentation and is listed in Diodes' automotive-grade product portfolio, making it suitable for under-hood and chassis applications requiring change control and extended temperature operation (–55°C to +175°C).
How does SMF4L64A-7 compare to SMF4L64CA in circuit implementation?
SMF4L64CA is the bidirectional variant: identical VRWM, VBR, and package, but symmetric clamping for both polarities. Unlike SMF4L64A-7's 0.5µA leakage at 64V, SMF4L64CA exhibits double leakage (1.0µA) due to dual-junction structure. Use SMF4L64A-7 for DC rails; select SMF4L64CA only when protecting AC-coupled or bidirectional signal paths like RS-485 or audio lines.
What is the recommended PCB layout for optimal thermal performance?
Mount SMF4L64A-7 on a 1" × 1" FR-4 board with 2 oz. copper pads matching the DO-219AA footprint (pad dimensions: C = 2.86 mm, G = 1.52 mm, X = 1.34 mm). Ensure solder fillets fully wet both terminals and avoid thermal relief on ground connections to maintain RθJA ≤ 96°C/W. Do not place heat-generating components within 2 mm.
SMF4L64A-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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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
SMF4L64A-7 FAQ
1.How can I place an order for SMF4L64A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L64A-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 SMF4L64A-7 reliable?
The price and inventory of SMF4L64A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L64A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L64A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L64A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L64A-7?
SMF4L64A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L64A-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 SMF4L64A-7?
For technical support, including SMF4L64A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L64A-7 requirements.
6.How does Aetrix verify that SMF4L64A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L64A-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 SMF4L64A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L64A-7?
All SMF4L64A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L64A-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 SMF4L64A-7 part is unused and in its original packaging.
Return procedure for SMF4L64A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L64A-7 Tags
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