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onsemi SMF11AT1
- Part No.:
- SMF11AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF11AT1.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
SMF11AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode in SOD−123FL package, designed for overvoltage protection of sensitive electronics. It features a 11 V working peak reverse voltage (VRWM), 18.2 V maximum clamping voltage (VC) at 11.0 A peak pulse current (IPP), and 200 W peak pulse power rating at 10/1000 µs waveform - ideal for protecting USB ports, I/O lines, and DC power rails in portable consumer devices.
For engineers reviewing the SMF11AT1 datasheet, pinout, applications, or equivalent options, this device delivers sub-1 ns response time, <2.5 µA reverse leakage at VRWM, Class 3 ESD immunity (>16 kV HBM), and low-profile surface-mount compatibility with 1.0 mm max height - critical for space-constrained, high-reliability board-level surge protection.
Technical Context
The SMF11AT1 operates as a Zener-based unidirectional TVS, triggering when reverse voltage exceeds its 12.2–13.5 V breakdown range (VBR @ IT = 1 mA). Its clamping action limits transient energy to ≤18.2 V under 11.0 A 10/1000 µs pulses, maintaining system integrity during ESD or lightning-induced surges.
Thermally, it uses a void-free thermosetting plastic case rated MSL 1, with 26 °C/W junction-to-cathode thermal resistance and 325 °C/W junction-to-ambient (on FR-4 with recommended footprint). It supports reflow up to 260 °C for 10 s and operates from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin for safe operation. |
| VBR (min/max) | 12.2 V / 13.5 V @ 1 mA - Confirmed Zener breakdown range; ensures predictable turn-on threshold across temperature and unit variation. |
| VC @ IPP | 18.2 V @ 11.0 A - Clamped voltage during worst-case 10/1000 µs surge; defines maximum stress imposed on downstream ICs. |
| IPP | 11.0 A - Peak pulse current capability at rated clamping voltage; determines survivability against IEC61000-4-4 40 A surge events. |
| IR @ VRWM | ≤2.5 µA - Ultra-low reverse leakage at operating voltage; avoids parasitic loading on low-power sensor or battery-backed circuits. |
| Response Time | <1 ns - Enables suppression of fast-rising transients (e.g., ESD contact discharge) before damage occurs to CMOS inputs. |
| ESD Rating | >16 kV HBM (Class 3), IEC61000-4-2 Level 4 - Validated immunity to human-body-model and system-level electrostatic discharge events. |
Pinout & Package
SOD−123FL surface-mount package: 2-terminal, low-profile (max height 1.0 mm), footprint area 8.45 mm², cathode indicated by polarity band. Compliant with JEDEC MO-203AA, MSL 1, and 260 °C reflow capable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink node | Connected to protected line (e.g., USB D+); carries full surge current to ground during clamping event. |
| 2 (Anode) | Reference/ground return path | Typically tied to system ground plane; must maintain low-inductance path to handle fast di/dt without voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 18.2 V VC at 11.0 A ensures downstream 3.3 V/5 V logic remains within absolute maximum ratings during surge. |
| Sub-1 ns response | Enables protection of high-speed interfaces (e.g., USB 2.0, HDMI) where transients exceed 100 V/ns slew rate. |
| Class 3 ESD robustness | Withstands >16 kV contact discharge per HBM, eliminating need for external ESD diodes in handheld product designs. |
| Small-footprint SOD−123FL | 8.45 mm² area and 1.0 mm height allow placement directly at connector entry points without PCB real estate penalty. |
| High surge reliability | Rated for 200 W (10/1000 µs) and 1000 W (8/20 µs) pulses - supports industrial-grade IEC61000-4-4 compliance testing. |
Applications
| USB 2.0 Data Line Protection | DC Power Rail Clamp |
|---|---|
Use Scenario: Protecting D+ and D− lines in smartphone charging ports against ESD and hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed in series with each data line, referenced to ground. Use Value: Limits voltage excursion to ≤18.2 V during ±15 kV air discharge, preserving USB PHY integrity without signal distortion. |
Use Scenario: Safeguarding 12 V input rails in automotive body control modules from load-dump spikes. IC Role / Device Role / Timing Role: Parallel-connected clamp between rail and chassis ground. Use Value: Absorbs 200 W transient energy within 1 ms, preventing regulator latch-up or microcontroller brownout. |
| Industrial Sensor Interface | POS Terminal Keypad ESD Shield |
Use Scenario: Shielding 4–20 mA analog input circuits in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional SMF11AT1 used with polarity-aware layout. Use Value: 2.5 µA leakage avoids measurement error in µA-level current loops while clamping to 18.2 V. |
Use Scenario: Hardening membrane keypad traces in retail point-of-sale terminals against operator ESD events. IC Role / Device Role / Timing Role: Discrete TVS mounted at each key trace origin, cathode to signal, anode to ground. Use Value: Sub-1 ns response prevents ESD-induced MCU reset or phantom keypresses during customer interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Same VRWM (11 V) and VC (18.2 V), but SMA package (larger footprint, 2.5 mm height). | Less suitable for ultra-thin mobile designs; better thermal dissipation in high-ambient industrial enclosures. | Choose SMAJ11A when board space allows and higher steady-state power handling (500 W Ppk) is needed. |
| P6SMB11A | Higher Ppk (600 W), DO-214AA package, 19.9 V VC @ 10.1 A - looser clamping tolerance. | Used in legacy AC/DC adapter outputs; not optimized for high-density portable PCB layouts. | Choose P6SMB11A only if legacy footprint reuse is mandatory and clamping voltage margin permits 19.9 V. |
Compared with SMAJ11A and P6SMB11A, the SMF11AT1 provides the smallest form factor and tightest clamping (18.2 V), making it optimal for modern compact electronics where board area and voltage headroom are constrained - though its 200 W rating requires careful surge duty-cycle management.
Availability
SMF11AT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial sensor conditioning, and DC power rail clamping requiring stable component supply and consistent surge performance across production batches.
Supply support for SMF11AT1 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 SMF11AT1 belongs to the SMF5.0AT1 Series of unidirectional TVS diodes, engineered specifically for board-level ESD and surge protection in space-constrained, high-reliability portable and industrial electronics.
FAQ
What is the clamping voltage of SMF11AT1 under maximum rated surge current?
The SMF11AT1 has a maximum clamping voltage (VC) of 18.2 V when subjected to its peak pulse current (IPP) of 11.0 A under the standard 10/1000 µs waveform. This value is guaranteed across temperature and process variation per the onsemi datasheet, ensuring downstream circuitry remains within safe operating voltage limits during transient events.
Is SMF11AT1 suitable for bidirectional signal line protection?
No - the SMF11AT1 is a unidirectional TVS diode, intended for DC-biased or ground-referenced lines like power rails or single-ended data paths. For bidirectional applications such as RS-485 or AC-coupled interfaces, a symmetric (bidirectional) TVS like SMBJ11CA would be required instead of SMF11AT1.
What is the reverse leakage current specification for SMF11AT1 at its working voltage?
At its working peak reverse voltage (VRWM) of 11 V and TA = 25°C, the SMF11AT1 exhibits a maximum reverse leakage current (IR) of 2.5 µA. This ultra-low leakage ensures minimal impact on battery life and signal integrity in always-on, low-power systems where the SMF11AT1 is deployed.
Can SMF11AT1 withstand IEC61000-4-2 Level 4 ESD events?
Yes - the SMF11AT1 is rated for Class 3 Human Body Model (>16 kV) and meets IEC61000-4-2 Level 4 (±8 kV contact, ±15 kV air) ESD requirements. Its sub-1 ns response time and low clamping voltage ensure effective protection of sensitive inputs without system upset when integrated per layout guidelines in the onsemi application notes.
What is the thermal resistance and maximum power dissipation of SMF11AT1 on a standard FR-4 PCB?
On a standard FR-4 board with the recommended SOD−123FL footprint, the SMF11AT1 has a junction-to-ambient thermal resistance (RθJA) of 325 °C/W, yielding a DC power dissipation limit of 385 mW at 25°C ambient. Derating applies above 25°C per the datasheet curve - critical for sustained surge duty cycles or high-temperature environments.
SMF11AT1 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 11A
- 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
SMF11AT1 FAQ
1.How can I place an order for SMF11AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF11AT1 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 SMF11AT1 reliable?
The price and inventory of SMF11AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF11AT1 is usually 5 days.
3.What payment methods are accepted for SMF11AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF11AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF11AT1?
SMF11AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF11AT1 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 SMF11AT1?
For technical support, including SMF11AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF11AT1 requirements.
6.How does Aetrix verify that SMF11AT1 is sourced from the original manufacturer or authorized distributors?
All SMF11AT1 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 SMF11AT1 meets industry standards.
7.What is the process for return or replacement of SMF11AT1?
All SMF11AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF11AT1, 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 SMF11AT1 part is unused and in its original packaging.
Return procedure for SMF11AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF11AT1 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
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D5V0L1B2WS-7
Diodes Incorporated
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