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onsemi SMF17AT1
- Part No.:
- SMF17AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF17AT1.pdf
- Description:
- TVS DIODE 17VWM 27.6VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:7,291
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Product details
Overview
SMF17AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode in SOD−123FL package, designed for overvoltage protection of sensitive electronics. It features a 17 V working peak reverse voltage (VRWM), 27.6 A maximum peak pulse current (IPP), 27.6 V clamping voltage (VC) at IPP, <1 ns response time, and 200 W peak pulse power (10/1000 µs). It is used in DC power rails of portable industrial sensors and USB-powered peripherals.
For engineers reviewing the SMF17AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, VC headroom relative to IC absolute maximum ratings, surge current capability under IEC61000−4−4 40 A transients, and SOD−123FL thermal performance with minimum PCB pad area.
Technical Context
The SMF17AT1 operates as a Zener-based unidirectional TVS, conducting only during reverse overvoltage events above its breakdown threshold (VBR = 18.9–20.9 V at IT = 1 mA). Its low zener impedance ensures stable clamping under fast-rising transients such as ESD (≥16 kV HBM) and EFT (IEC61000−4−4 Level 4).
Thermal design relies on junction-to-ambient resistance (RθJA = 325 °C/W) with recommended FR−4 footprint, enabling 385 mW steady-state dissipation at TA = 25°C. Peak surge handling is defined for non-repetitive 10/1000 µs pulses up to 200 W, derated linearly above 25°C ambient per Figure 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail by ≥10%. |
| VBR @ IT=1 mA | 18.9–20.9 V - Breakdown onset range; defines minimum overvoltage threshold for protection activation. |
| VC @ IPP=27.6 A | 27.6 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs. |
| IPP | 27.6 A - Peak pulse current survivability; supports IEC61000−4−4 40 A line-to-ground surges with margin. |
| Response Time | <1 ns - Enables suppression of sub-nanosecond ESD events before damage occurs to CMOS inputs. |
| ESD Rating | Class 3 HBM (>16 kV) - Meets IEC61000−4−2 Level 4 for robust handling in manufacturing and end-use environments. |
| Package | SOD−123FL - Surface-mount flat-lead package (1.5–1.8 mm × 2.5–2.9 mm × ≤1.0 mm height); compatible with standard 8 mm tape-and-reel automation. |
Pinout & Package
SOD−123FL is a two-terminal surface-mount package with cathode indicated by a polarity band. Mounting orientation is unrestricted; leads are 100% matte tin with MSL 1 rating and 260°C reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected circuit's higher-potential node (e.g., VBUS); conducts during reverse overvoltage. |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes current path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL | Max height 1.0 mm - Enables use in ultra-thin portable devices and space-constrained IoT sensor modules. |
| Small footprint area | 8.45 mm² - Reduces PCB real estate vs. SMA/SMB packages while maintaining surge robustness. |
| Fast response <1 ns | Prevents voltage overshoot beyond IC absolute maximum ratings during nanosecond-scale ESD strikes. |
| IEC61000−4−2/−4 compliance | Validated for 16 kV contact ESD and 40 A EFT bursts - eliminates need for external filtering in Class B industrial designs. |
| Tape-and-reel packaging | 3,000 units/reel, 8 mm carrier - Supports high-volume automated assembly without manual handling or static risk. |
Applications
| USB 2.0 Data Line Protection | Industrial Sensor Power Input |
|---|---|
|
Use Scenario: Protects D+ and D− lines in USB host/peripheral ports against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between data line and ground, clamping transients before they reach USB transceiver ESD structures. Use Value: Prevents lockup or latch-up in USB PHY ICs by limiting voltage to ≤27.6 V during 15 kV HBM strikes, preserving signal integrity. |
Use Scenario: Shields 12–24 V DC input of temperature/humidity sensors in factory automation panels. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, triggered by inductive switching spikes from nearby solenoids or relays. Use Value: Absorbs 200 W surges without degradation, ensuring sensor uptime during 40 A IEC61000−4−4 burst tests. |
| POS Terminal Power Supply | Smart Meter Battery Backup Circuit |
|
Use Scenario: Guards 5 V logic supply in point-of-sale terminals exposed to AC mains coupling and hot-plug transients. IC Role / Device Role / Timing Role: Secondary protection stage after bulk MOV, providing precise clamping near microcontroller VDD tolerance limits. Use Value: Limits clamped voltage to 27.6 V with <1 ns latency, preventing brownout resets during 10/1000 µs surges. |
Use Scenario: Protects lithium coin-cell backup path in utility smart meters from battery insertion transients and ESD. IC Role / Device Role / Timing Role: Low-leakage (IR ≤1 µA @ 17 V) TVS placed across backup rail to avoid draining CR2032 cells. Use Value: Maintains <1 µA reverse leakage at 17 V VRWM, extending 10-year meter battery life while surviving 16 kV ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | DO−214AC package; 400 W peak power; higher RθJA (50°C/W); larger footprint (4.3 × 2.6 mm). | Better surge handling but requires more PCB area and heatsinking; less suitable for ultra-thin devices. | Select SMAJ17A when 400 W surge margin is required and board space allows DO−214AC mounting. |
| 1.5SMC17A | DO−214AB package; 1500 W peak power; 10× larger size (7.1 × 6.2 mm); higher IR (5 µA @ 17 V). | Designed for AC mains or high-energy industrial surges; over-specified for low-voltage DC rails. | Choose 1.5SMC17A only for primary AC-side protection where 1500 W rating justifies large footprint and leakage penalty. |
Compared with SMAJ17A and 1.5SMC17A, SMF17AT1 delivers optimal balance of 200 W surge capability, 1.0 mm profile, and 8.45 mm² footprint-making it the preferred choice for space-constrained 12–24 V DC systems requiring certified ESD/EFT immunity without thermal derating penalties.
Availability
SMF17AT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial sensor power inputs, POS terminal supplies, and smart meter backup circuits requiring stable component supply and full IEC61000−4−2/−4 compliance.
Supply support for SMF17AT1 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SMFxxAT1 series belongs to onsemi's transient voltage suppressor product line, engineered specifically for compact, high-reliability DC rail protection in portable and industrial electronics where low profile and fast response are critical.
FAQ
What is the working peak reverse voltage (VRWM) of SMF17AT1?
The SMF17AT1 has a VRWM of 17 V, meaning it remains non-conductive under normal operation up to this reverse voltage. This value is selected to be ≥10% above typical 15 V industrial sensor rails or 12 V USB power buses, ensuring no leakage or conduction during steady-state conditions while allowing headroom for ripple and tolerance.
How does SMF17AT1 compare to bidirectional TVS diodes in ESD protection?
SMF17AT1 is unidirectional and optimized for DC power-line protection where polarity is fixed, offering lower clamping voltage (27.6 V) and tighter VBR tolerance than equivalent bidirectional parts. Bidirectional variants like SMBJ17CA introduce ~10% higher VC due to dual-Zener structure and are unnecessary when circuit polarity is known and stable-making SMF17AT1 more efficient for single-rail applications.
Can SMF17AT1 be used in automotive infotainment USB ports?
Yes, SMF17AT1 meets ISO 10605 (330 pF/330 Ω) ESD requirements up to ±15 kV and supports IEC61000−4−4 EFT testing-key for automotive infotainment USB ports. Its SOD−123FL package withstands vibration and thermal cycling, and its 17 V VRWM aligns with 5 V USB VBUS with margin. However, AEC-Q200 qualification must be confirmed separately per application.
What is the maximum allowable PCB pad size for optimal thermal performance of SMF17AT1?
The datasheet specifies a minimum recommended footprint for the SOD−123FL package to achieve rated RθJA = 325 °C/W and 385 mW steady-state dissipation. Increasing pad area beyond the minimum (e.g., using thermal vias or copper pours) lowers RθJA and improves surge survivability-but no maximum pad size is specified. For 200 W transient handling, doubling pad area can reduce junction temperature rise by ~30% during pulse events.
Does SMF17AT1 require derating at elevated ambient temperatures?
Yes, SMF17AT1 must be derated above 25°C ambient per Figure 4 in the datasheet: peak pulse power drops linearly to zero at 150°C. At 85°C ambient, usable peak power is ~70% of 200 W (≈140 W), and steady-state power drops to ~220 mW. Designers must verify clamping performance under worst-case thermal conditions using the provided derating curve and actual board layout.
SMF17AT1 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- 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
SMF17AT1 FAQ
1.How can I place an order for SMF17AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF17AT1 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 SMF17AT1 reliable?
The price and inventory of SMF17AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF17AT1 is usually 5 days.
3.What payment methods are accepted for SMF17AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF17AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF17AT1?
SMF17AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF17AT1 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 SMF17AT1?
For technical support, including SMF17AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF17AT1 requirements.
6.How does Aetrix verify that SMF17AT1 is sourced from the original manufacturer or authorized distributors?
All SMF17AT1 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 SMF17AT1 meets industry standards.
7.What is the process for return or replacement of SMF17AT1?
All SMF17AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF17AT1, 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 SMF17AT1 part is unused and in its original packaging.
Return procedure for SMF17AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF17AT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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