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onsemi SMF6.5AT1
- Part No.:
- SMF6.5AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF6.5AT1.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:5,937
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Product details
Overview
SMF6.5AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for primary overvoltage protection at DC power rails and signal lines. It features a 6.5 V working peak reverse voltage (VRWM), 11.2 V maximum clamping voltage (VC) at 17.9 A peak pulse current (IPP), and 200 W peak pulse power (10/1000 µs). It is used in portable electronics power input stages to absorb ESD and lightning-induced surges.
For engineers reviewing the SMF6.5AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, clamping voltage headroom relative to protected IC absolute maximum ratings, IEC 61000-4-2/4-4 compliance, and SOD−123FL footprint compatibility with high-density PCB layouts.
Technical Context
The SMF6.5AT1 operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its breakdown threshold (VBR = 7.22–7.98 V @ IT = 10 mA). Its <1 ns response time enables suppression of fast transients before downstream components experience overstress.
It delivers 200 W peak pulse power per 10/1000 µs waveform and sustains 1000 W under 8/20 µs surge conditions. Thermal resistance is 325°C/W (junction-to-ambient, FR-4 board), with MSL 1 reflow rating up to 260°C for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 6.5 V - Maximum continuous reverse voltage before clamping begins; must exceed circuit's max operating voltage by ≥10%. |
| VBR (min/max) | 7.22 V / 7.98 V @ 10 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPP | 11.2 V @ 17.9 A - Clamped voltage seen by protected load during worst-case 10/1000 µs surge. |
| IR @ VRWM | 250 µA max - Low leakage preserves battery life in always-on portable devices. |
| ESD Rating | Class 3 (>16 kV HBM); IEC 61000-4-2 Level 4 - Validated for direct human-contact interface protection. |
| Package | SOD−123FL - 2.5 mm × 1.2 mm footprint, 1.0 mm max height; compatible with standard 8 mm tape-and-reel automation. |
| Thermal Resistance | RθJA = 325°C/W - Requires minimum recommended pad layout (4.19 mm²) for rated 385 mW steady-state dissipation. |
Pinout & Package
SOD−123FL surface-mount package: cathode indicated by polarity band; anode and cathode terminals occupy opposing ends of the molded body. Mounting position is unrestricted; qualified for 260°C reflow (MSL 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to system ground or low-impedance return path; carries full surge current during clamping. |
| 2 (Non-banded End) | Anode | Connected to protected line (e.g., VBUS, USB_VCC); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL | 1.0 mm max height enables use in ultra-thin mobile designs without mechanical interference. |
| Fast response time | <1 ns enables suppression of ESD events before logic-level ICs enter latch-up or suffer gate oxide damage. |
| IEC 61000-4-4 compliance | 40 A surge immunity supports industrial-grade power supply and communication port protection. |
| Matte tin lead finish | RoHS-compliant, solderable with standard SnPb or lead-free processes; no post-solder cleaning required. |
Applications
| USB Power Input Protection | Smartphone Battery Charging Circuit |
|---|---|
|
Use Scenario: Protects USB Type-C VBUS line against hot-plug transients and ESD during cable insertion. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND, clamping surges before they reach USB controller or PMIC. Use Value: Limits VBUS overshoot to ≤11.2 V, preserving 5.5 V absolute maximum rating of USB PD controllers. |
Use Scenario: Shields lithium-ion battery charge management IC from voltage spikes induced by adapter switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery input rail, activated within 1 ns of transient onset. Use Value: Prevents false overvoltage shutdown and extends cycle life by eliminating >6.5 V stress on battery monitor inputs. |
| Industrial Sensor Node Power Rail | POS Terminal Serial Interface |
|
Use Scenario: Guards 3.3 V or 5 V sensor node power input against 4 kV ESD per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: First-line defense on main DC input, absorbing energy before it propagates to LDOs and microcontrollers. Use Value: Enables certified ESD robustness without adding bulk capacitance that would slow power-up sequencing. |
Use Scenario: Protects RS-232/RS-485 transceiver pins from customer-handling ESD in retail environments. IC Role / Device Role / Timing Role: Point-of-entry TVS on differential bus lines, referenced to local ground plane. Use Value: Maintains signal integrity by limiting clamping voltage to 11.2 V while adding only 0.5 pF parasitic capacitance @ 0 V. |
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 (6.5 V) and VC (11.2 V), but SMA package (larger footprint, higher RθJA = 40°C/W). | Requires 5.3 mm × 2.6 mm board area vs. SMF6.5AT1's 2.5 mm × 1.2 mm - unsuitable for space-constrained designs. | Select SMAJ6.5A only if higher steady-state power handling (>500 mW) is needed and board area permits. |
| 1.5SMC6.5A | Higher peak power (1500 W vs. 200 W), DO-214AB package, VRWM = 6.5 V, VC = 11.2 V. | Designed for AC mains or automotive load-dump protection; overqualified for low-energy portable ESD. | Choose 1.5SMC6.5A only for high-energy surge environments (e.g., 12 V automotive accessory ports), not consumer USB rails. |
Compared with SMAJ6.5A and 1.5SMC6.5A, the SMF6.5AT1 provides optimal balance of compact size, low leakage (250 µA), and IEC-compliant ESD performance for battery-powered portable electronics - where board area, quiescent current, and reflow compatibility are critical.
Availability
SMF6.5AT1 is available at Aetrix Electronics and suitable for USB power delivery systems, smartphone charging circuits, and industrial sensor node protection requiring stable component supply and full traceability.
Supply support for SMF6.5AT1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SMF6.5AT1 belongs to the SMF5.0AT1 Series of unidirectional TVS diodes engineered specifically for space-constrained, low-leakage DC rail protection in portable and battery-operated electronics.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF6.5AT1?
The SMF6.5AT1 has a VRWM of 6.5 V, meaning it remains non-conductive up to this reverse voltage under normal operation. This value is selected to exceed typical 5 V system rails by ~30%, ensuring no leakage during steady-state while enabling fast clamping above that threshold. The SMF6.5AT1 maintains this rating across −55°C to +150°C operating temperature.
How does the SMF6.5AT1 compare to bidirectional TVS diodes in ESD protection?
The SMF6.5AT1 is unidirectional and optimized for DC power line protection, offering lower leakage (250 µA max @ VRWM) than comparable bidirectional parts. Unlike bidirectional TVS diodes, it does not conduct in forward bias - making it ideal for asymmetric rails like VBUS/GND. The SMF6.5AT1 achieves Class 3 HBM (>16 kV) and IEC 61000-4-2 Level 4 without compromising forward conduction behavior.
Can the SMF6.5AT1 be used on a 3.3 V rail?
No - the SMF6.5AT1 is not suitable for 3.3 V rails because its 6.5 V VRWM exceeds the 3.3 V supply by nearly 100%, risking insufficient margin for tolerance and ripple. For 3.3 V systems, a part like SMF3.3AT1 (VRWM = 3.3 V) is required. Using SMF6.5AT1 on 3.3 V would leave excessive headroom, allowing damaging transients to pass unclamped until reaching 11.2 V.
What is the maximum clamping voltage of the SMF6.5AT1 under surge conditions?
The SMF6.5AT1 exhibits a maximum clamping voltage (VC) of 11.2 V when subjected to its rated peak pulse current of 17.9 A (10/1000 µs waveform). This value is guaranteed across temperature and represents the highest voltage imposed on the protected circuit during worst-case transient events. The SMF6.5AT1 achieves this with minimal parasitic capacitance (<0.5 pF), preserving signal integrity in high-speed interfaces.
Is the SMF6.5AT1 compliant with lead-free assembly standards?
Yes - the SMF6.5AT1 features 100% matte tin (Sn) lead finish and is qualified for lead-free reflow up to 260°C for 10 seconds, meeting J-STD-020 MSL 1 requirements. Its SOD−123FL package supports automated placement and standard Pb-free solder profiles without delamination or voiding. The SMF6.5AT1 is RoHS-compliant and halogen-free per onsemi documentation.
SMF6.5AT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOD-123F
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 17.9A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123FL
SMF6.5AT1 FAQ
1.How can I place an order for SMF6.5AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF6.5AT1 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 SMF6.5AT1 reliable?
The price and inventory of SMF6.5AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF6.5AT1 is usually 5 days.
3.What payment methods are accepted for SMF6.5AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF6.5AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF6.5AT1?
SMF6.5AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF6.5AT1 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 SMF6.5AT1?
For technical support, including SMF6.5AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF6.5AT1 requirements.
6.How does Aetrix verify that SMF6.5AT1 is sourced from the original manufacturer or authorized distributors?
All SMF6.5AT1 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 SMF6.5AT1 meets industry standards.
7.What is the process for return or replacement of SMF6.5AT1?
All SMF6.5AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF6.5AT1, 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 SMF6.5AT1 part is unused and in its original packaging.
Return procedure for SMF6.5AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF6.5AT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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