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Diodes Incorporated SMF4L6.5A-7
- Part No.:
- SMF4L6.5A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L6.5A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,066
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Product details
Overview
SMF4L6.5A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in low-voltage DC power rails. It features a 6.5V working peak reverse voltage (VRWM), 7.22V minimum breakdown voltage (VBR), 11.2V maximum clamping voltage (VC) at 35.7A peak pulse current, and delivers ±30kV ESD immunity per IEC61000-4-2 - ideal for protecting USB ports, battery management circuits, and automotive body control modules.
For engineers reviewing the SMF4L6.5A-7 datasheet, SMF4L6.5A-7 pinout, SMF4L6.5A-7 application, or SMF4L6.5A-7 equivalent, key selection criteria include clamping performance under 10/1000µs surge, unidirectional polarity confirmation via cathode band marking, DO-219AA package thermal resistance (RθJA = 96°C/W), and compliance with AEC-Q200-ready manufacturing processes.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during voltage transients, leveraging avalanche breakdown to divert surge energy away from sensitive downstream circuitry. Its sub-1ns response time (unidirectional) ensures protection before IC damage thresholds are exceeded, and its 400W peak pulse power rating is validated using the standardized 10µs × 1000µs waveform.
The device is optimized for low-capacitance, high-reliability DC rail protection - not signal-line or AC applications. Its DO-219AA package enables compact placement near connectors or IC power pins, and its 1.0W steady-state power dissipation supports continuous operation in thermally constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 6.5V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 5V logic/bus rails. |
| VBR (min) | 7.22V @ 10mA - Confirmed avalanche onset threshold; ensures reliable triggering without premature conduction. |
| VC (max) | 11.2V @ 35.7A - Clamped voltage during worst-case 10/1000µs surge; guarantees protected ICs remain below absolute maximum ratings. |
| PPK | 400W - Peak pulse power handling capability; sustains 35.7A surge at 11.2V for 1ms duration without failure. |
| ESD Rating | ±30kV air / ±30kV contact (IEC61000-4-2) - Full system-level ESD immunity without external shielding or filtering. |
| Leakage (IR) | 500µA @ VRWM - Low standby current preserves battery life in always-on portable and automotive modules. |
| Package | DO-219AA - Surface-mount, 2-pin, 1.9mm × 2.8mm footprint; optimized for automated assembly and thermal transfer to PCB copper. |
Pinout & Package
DO-219AA package: ultra-compact, flat-lead, molded plastic housing with matte tin-plated copper alloy leads. Cathode band denotes unidirectional polarity; no band indicates bidirectional variant (not applicable to SMF4L6.5A-7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Completes clamping path during positive transients; must be routed with minimal inductance to ground plane. |
| Cathode | High-side connection to protected line (e.g., VBUS, BAT+) | Marked by visible band; carries full surge current into ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power (10/1000µs) | Enables single-device protection against ISO 7637-2 Pulse 1/2a/5a surges in 12V automotive systems without derating. |
| Sub-1ns response time (unidirectional) | Clamps transients before propagation into microcontroller I/O or PMIC input stages, preventing latch-up or gate oxide damage. |
| RoHS-compliant, halogen-free "Green" compound | Meets automotive and industrial environmental mandates (Br+Cl <1500ppm, Sb <1000ppm) without compromising thermal or mechanical reliability. |
| JEDEC-qualified high-reliability construction | Validated per AEC-Q200 stress test conditions; suitable for under-hood and infotainment applications requiring long-term stability. |
Applications
| USB Power Delivery Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 5V/9V/15V USB-C PD lines from hot-swap transients and ESD events during plug insertion. IC Role / Device Role: Unidirectional shunt clamp placed between VBUS and GND, upstream of buck converter input. Use Value: Limits clamped voltage to 11.2V, ensuring PD controller ICs (e.g., TUSB73x, FUSB302) operate within 16V absolute max rating. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs from load-dump and jump-start induced spikes in door modules. IC Role / Device Role: Primary rail clamp on 12V supply input to BCM power management IC (e.g., TLE4275). Use Value: Withstands 35.7A surge current while holding clamping voltage below 12.5V, preserving regulator input integrity. |
| Smartphone Battery Interface | Industrial Sensor Node Power Rail |
|
Use Scenario: Guarding lithium-ion battery protection ICs (e.g., BQ297xx) and fuel gauges against ESD during charging port handling. IC Role / Device Role: Bidirectional-capable but used unidirectionally between BAT+ and system ground to block reverse polarity faults. Use Value: 500µA leakage at 6.5V minimizes self-discharge; ±30kV ESD rating eliminates need for secondary polymer TVS. |
Use Scenario: Securing 3.3V/5V power inputs of wireless sensor nodes (LoRaWAN, NB-IoT) deployed in harsh factory environments. IC Role / Device Role: First-line transient suppressor on main DC input, placed before LDO regulators and RF front-end ICs. Use Value: DO-219AA footprint allows placement within 2mm of connector; 96°C/W RθJA enables stable operation at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5A | Same VRWM (6.5V) and VC (11.2V), but SMA package (larger footprint, higher RθJA = 110°C/W) | Less suitable for space-constrained PCBs; lower thermal efficiency limits sustained surge duty cycle | Select when legacy SMA footprint compatibility is required and board area permits. |
| SMF4L6.5CA | Bidirectional variant; identical VRWM, VBR, VC, and PPK, but symmetrical clamping for AC-coupled or floating lines | Required only where reverse-polarity transients exist (e.g., RS-485, CAN bus); unnecessary for DC rail protection | Choose only if bidirectional clamping is mandated by system-level surge test requirements. |
Compared with SMAJ6.5A, SMF4L6.5A-7 offers superior thermal performance and smaller size; compared with SMF4L6.5CA, it provides lower capacitance and avoids redundant bidirectional capability in unidirectional DC applications - optimizing cost, layout, and reliability.
Availability
SMF4L6.5A-7 is available at Aetrix Electronics and suitable for USB-C power delivery systems, automotive body electronics, and industrial sensor node designs requiring stable component supply across extended production lifecycles.
Supply support for SMF4L6.5A-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' high-power surface-mount TVS portfolio, engineered specifically for compact, high-efficiency transient suppression in next-generation automotive ECUs and portable electronics with stringent ESD and surge immunity requirements.
FAQ
What is the polarity configuration of SMF4L6.5A-7?
SMF4L6.5A-7 is a unidirectional TVS diode, indicated by the cathode band marking on the DO-219AA package. It conducts only during positive transients on the cathode side relative to anode, making it suitable for DC power rail protection where reverse voltage is not expected.
Does SMF4L6.5A-7 meet AEC-Q200 requirements?
While SMF4L6.5A-7 itself is not AEC-Q200 certified, it is manufactured in IATF 16949-certified facilities and qualified to JEDEC standards referenced in AEC-Q200. For full qualification, Diodes offers the automotive-grade Q-suffix variant SMF4L6.5AQ-7.
How does SMF4L6.5A-7 compare to older SMF series devices?
SMF4L6.5A-7 delivers 400W peak power (vs. 200W in legacy SMF), improved clamping ratio (VC/VBR ≈ 1.55), and tighter VBR tolerance (±5% typical). Its DO-219AA package reduces footprint by 40% versus DO-214AA, enabling denser PCB layouts without sacrificing surge capability.
Can SMF4L6.5A-7 be used in parallel for higher surge current handling?
No - paralleling TVS diodes is not recommended due to mismatched VBR tolerances causing current imbalance and premature failure. For >35.7A surge capability, select a higher-rated part (e.g., SMF4L8.0A-7) or implement staged protection with upstream fusing and downstream TVS arrays.
SMF4L6.5A-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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 35.7A
- 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
SMF4L6.5A-7 FAQ
1.How can I place an order for SMF4L6.5A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L6.5A-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 SMF4L6.5A-7 reliable?
The price and inventory of SMF4L6.5A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L6.5A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L6.5A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L6.5A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L6.5A-7?
SMF4L6.5A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L6.5A-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 SMF4L6.5A-7?
For technical support, including SMF4L6.5A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L6.5A-7 requirements.
6.How does Aetrix verify that SMF4L6.5A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L6.5A-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 SMF4L6.5A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L6.5A-7?
All SMF4L6.5A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L6.5A-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 SMF4L6.5A-7 part is unused and in its original packaging.
Return procedure for SMF4L6.5A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L6.5A-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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