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onsemi SMF14AT1
- Part No.:
- SMF14AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF14AT1.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:7,746
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Product details
Overview
SMF14AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 14 V working peak reverse voltage (VRWM), 23.2 A maximum peak pulse current (IPP), 17.2 V maximum breakdown voltage (VBR), 23.2 V clamping voltage (VC) at IPP, and <1 ns response time - making it suitable for protecting USB ports, DC-DC converter inputs, and microcontroller I/O pins against ESD and lightning-induced surges.
For engineers reviewing the SMF14AT1 datasheet, pinout, applications, or equivalent options, this device is evaluated for fast transient suppression in space-constrained consumer and industrial electronics where low-profile SOD−123FL packaging, IEC61000−4−2 Level 4 (±16 kV HBM) ESD robustness, and sub-1 ns turn-on are critical selection criteria.
Technical Context
The SMF14AT1 operates as a zener-based unidirectional TVS, leveraging avalanche breakdown to clamp transients above its VRWM of 14 V. Its low zener impedance ensures stable clamping under 23.2 A 10/1000 µs surge pulses, while its thermal resistance (RθJA = 325 °C/W) supports 385 mW steady-state dissipation on FR-4 with recommended pad layout.
It meets IEC61000−4−2 Level 4 (±16 kV contact discharge) and IEC61000−4−4 (40 A surge) immunity standards. The device is rated for −55 °C to +150 °C operation, qualified to MSL 1, and reflow-compatible up to 260 °C for 10 s - enabling reliable integration into automated SMT production lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 14 V - sets minimum operating voltage threshold before clamping begins; must exceed circuit's max continuous DC voltage. |
| Breakdown Voltage (VBR) @ IT = 1 mA | 15.6–17.2 V - defines guaranteed avalanche onset range; ensures predictable turn-on during transients. |
| Clamping Voltage (VC) @ IPP = 23.2 A | 23.2 V - maximum voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| Peak Pulse Power (Ppk) @ 10/1000 µs | 200 W - energy-handling capability for single high-energy transients; sufficient for IEC61000−4−5 line surges. |
| Response Time | <1 ns - enables suppression before sensitive logic or analog circuits experience damaging overvoltage. |
| ESD Rating (HBM) | Class 3 (>16 kV) - exceeds IEC61000−4−2 Level 4 requirements for handheld and portable equipment. |
| Package | SOD−123FL - ultra-low profile (max height 1.0 mm), small footprint (8.45 mm²), tape-and-reel (3,000 units/reel). |
Pinout & Package
SOD−123FL surface-mount package with cathode indicated by polarity band; 2-terminal configuration optimized for compact PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Anode-side connection point for reverse-biased clamping | Connected to protected line (e.g., VBUS); conducts when transient exceeds VRWM. |
| 2 (Anode) | Reference/ground return path | Connected to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL package | Max height 1.0 mm - enables use in slim mobile devices and stacked PCB assemblies without mechanical interference. |
| IEC61000−4−2 Level 4 ESD protection | ±16 kV contact discharge - eliminates need for external ESD filters in USB, HDMI, and button interfaces. |
| Fast 10/1000 µs surge rating | 200 W peak power - handles induced lightning surges per IEC61000−4−5 in AC/DC adapters and PoE injectors. |
| Low leakage current | <1 µA @ 14 V - prevents battery drain in always-on IoT sensors and wearable power rails. |
| MSL 1 moisture sensitivity | No dry-pack or bake required - simplifies inventory handling and reduces manufacturing cost in high-volume SMT lines. |
Applications
| USB 2.0 Data Line Protection | DC-DC Converter Input Rail |
|---|---|
Use Scenario: Protecting D+ and D− lines in smartphone charging circuits from hot-plug transients and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between data line and ground to clamp ±15 kV HBM discharges before reaching USB PHY. Use Value: Prevents latch-up and permanent damage to USB transceivers while maintaining signal integrity due to low capacitance (<100 pF @ 0 V). |
Use Scenario: Safeguarding input stage of buck converters in industrial PLCs exposed to 24 V supply line surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across VIN and GND to shunt 10/1000 µs transients exceeding 14 V before regulator IC sees overvoltage. Use Value: Enables compliance with IEC61000−4−4 (40 A) immunity testing without derating converter input voltage range. |
| Microcontroller GPIO Protection | Automotive Body Control Module (BCM) Inputs |
Use Scenario: Shielding 3.3 V I/O pins of ARM Cortex-M MCUs in smart home hubs from cable discharge events. IC Role / Device Role / Timing Role: Localized TVS mounted directly at connector entry point to minimize trace inductance and ensure sub-ns clamping. Use Value: Eliminates need for series resistors or RC filters, preserving rise/fall times for SPI/I²C signals up to 1 MHz. |
Use Scenario: Protecting LIN bus inputs and sensor analog inputs in BCMs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS (VRWM = 14 V) placed on 12 V rail-derived sensing lines to block transients while passing nominal 12 V signals. Use Value: Survives automotive-grade temperature cycling (−40 °C to +125 °C ambient) and maintains clamping performance after 1,000 surge cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Same VRWM (14 V), but SMA package (higher RθJA = 50°C/W); 400 W peak power (10/1000 µs) | Larger footprint (10.5 mm²) and 2.2 mm height - unsuitable for ultra-thin designs | Select when higher surge energy handling is needed and board space allows larger package. |
| P6SMB14A | Same VRWM (14 V), DO-214AA package; 600 W peak power (10/1000 µs); higher VC (23.2 V same) | Through-hole or larger SMT footprint (29 mm²); not MSL 1 qualified | Choose for legacy through-hole designs or where >200 W surge margin is mandatory despite size penalty. |
Compared with SMAJ14A and P6SMB14A, the SMF14AT1 delivers identical clamping performance in a 40% smaller footprint and 55% lower profile, enabling miniaturization in portable electronics - though its 200 W rating requires careful coordination with upstream fusing for sustained surge events.
Availability
SMF14AT1 is available at Aetrix Electronics and suitable for USB interface protection, DC-DC input rail hardening, and microcontroller I/O safeguarding requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF14AT1 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, and sensor solutions for automotive, industrial, and consumer markets.
The SMF14AT1 belongs to the SMF5.0AT1 Series of unidirectional TVS diodes engineered for high-surge, low-profile overvoltage protection in space-constrained portable and industrial electronics.
FAQ
What is the clamping voltage of the SMF14AT1 at its rated peak pulse current?
The SMF14AT1 has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current (IPP) of 23.2 A under the standard 10/1000 µs waveform. This value is specified in the Electrical Characteristics table on page 3 of the official datasheet and represents the upper limit of voltage imposed on the protected circuit during worst-case surge conditions. Designers must verify that downstream components tolerate this clamping level.
Is the SMF14AT1 suitable for bidirectional transient protection?
No, the SMF14AT1 is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics - including breakdown voltage and clamping behavior - are defined only for reverse-bias conduction (cathode positive relative to anode). For AC signal lines or applications requiring symmetrical ± transient suppression, a dedicated bidirectional part such as SMBJ14CA must be used instead of the SMF14AT1.
What is the maximum operating temperature range for the SMF14AT1?
The SMF14AT1 is rated for an operating and storage temperature range of −55 °C to +150 °C. This wide range supports deployment in harsh environments such as automotive engine compartments, industrial motor drives, and outdoor telecom equipment. The device maintains its specified VRWM, VBR, and clamping performance across this full range, as confirmed in the Maximum Ratings table (page 2) and derating curves (page 5) of the datasheet.
Does the SMF14AT1 meet IEC61000−4−4 immunity requirements?
Yes, the SMF14AT1 provides 40 A surge protection per IEC61000−4−4 (electrical fast transient/burst) when applied in accordance with the recommended PCB layout and grounding practices. This capability is explicitly stated in the Specification Features section (page 1) and validated via standardized test waveforms. System-level compliance requires proper placement near threat entry points and low-inductance grounding - the SMF14AT1 alone does not guarantee full system pass without correct implementation.
How is the polarity marked on the SMF14AT1 SOD−123FL package?
The SMF14AT1 uses a cathode band - a visible stripe printed on the body near terminal 1 - to indicate polarity. As shown in the Marking Diagram (page 1) and Outline Dimensions (page 7), terminal 1 is the cathode and terminal 2 is the anode. During PCB layout, the cathode band must align with the designated cathode pad (typically connected to the protected line), and misorientation will prevent proper clamping function. The band is clearly visible under 10× magnification and compatible with automated optical inspection (AOI).
SMF14AT1 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- 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
SMF14AT1 FAQ
1.How can I place an order for SMF14AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF14AT1 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 SMF14AT1 reliable?
The price and inventory of SMF14AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF14AT1 is usually 5 days.
3.What payment methods are accepted for SMF14AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF14AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF14AT1?
SMF14AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF14AT1 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 SMF14AT1?
For technical support, including SMF14AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF14AT1 requirements.
6.How does Aetrix verify that SMF14AT1 is sourced from the original manufacturer or authorized distributors?
All SMF14AT1 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 SMF14AT1 meets industry standards.
7.What is the process for return or replacement of SMF14AT1?
All SMF14AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF14AT1, 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 SMF14AT1 part is unused and in its original packaging.
Return procedure for SMF14AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF14AT1 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.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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