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onsemi SMF16AT1
- Part No.:
- SMF16AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF16AT1.pdf
- Description:
- TVS DIODE 16VWM 26VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:8,412
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Product details
Overview
SMF16AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 16 V working peak reverse voltage (VRWM), 26 A maximum peak pulse current (IPP), 26 V maximum clamping voltage (VC) at IPP, <1 ns response time, and 200 W peak pulse power rating at 10/1000 µs waveform - ideal for protecting USB ports, I/O interfaces, and low-voltage microcontroller inputs against ESD and surge events.
For engineers reviewing the SMF16AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM alignment with system operating voltage, VC margin relative to IC absolute maximum ratings, thermal derating under repeated surge conditions, and SOD−123FL footprint compatibility with high-density PCB layouts.
Technical Context
The SMF16AT1 operates as a Zener-based unidirectional TVS, conducting only in reverse breakdown when transient voltage exceeds VRWM = 16 V. Its clamping action limits downstream voltage to ≤26 V at 26 A peak pulse current (10/1000 µs), with low zener impedance ensuring minimal overshoot during fast transients.
It delivers Class 3 HBM ESD immunity (>16 kV), meets IEC61000−4−2 Level 4 (±8 kV contact / ±15 kV air) and IEC61000−4−4 (40 A, 5/50 ns) standards, and maintains <1 µA leakage at VRWM - critical for battery-powered sensor nodes and always-on circuits where standby current must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 16 V - sets minimum system operating voltage threshold before clamping begins; matches 12–15 V nominal rails with safety margin. |
| Breakdown Voltage (VBR) @ IT = 1 mA | 17.8–19.7 V - defines statistical distribution of turn-on voltage; ensures reliable conduction above VRWM without premature triggering. |
| Maximum Clamping Voltage (VC) @ IPP = 26 A | 26 V - maximum voltage seen by protected IC during worst-case 10/1000 µs surge; must stay below downstream device absolute max rating. |
| Peak Pulse Power (Ppk) @ 10/1000 µs | 200 W - energy-handling capacity for single transient events; sufficient for IEC61000−4−5 Line-to-Ground surges up to 1 kV. |
| Response Time | <1 ns - enables suppression of nanosecond-scale ESD spikes before logic-level damage occurs. |
| Leakage Current (IR) @ VRWM | <1 µA - negligible standby power loss in always-on applications such as real-time clocks or battery-backed memory. |
| ESD Rating (HBM) | >16 kV - exceeds JEDEC JS-001 Class 3 requirement, enabling direct protection of exposed connectors without external RC filtering. |
Pinout & Package
SOD−123FL surface-mount package: 2.5–2.9 mm length × 1.5–1.8 mm width × ≤1.0 mm height; cathode indicated by polarity band; 100% matte tin lead finish; MSL 1 rated; compatible with standard reflow profiles up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink node | Connected to protected line; carries full surge current to ground path during clamping; requires low-inductance trace routing. |
| 2 (Anode) | Reference / Ground return | Must connect directly to low-impedance system ground plane; shared ground with protected IC improves clamping effectiveness. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL package | Max height 1.0 mm - enables use in ultra-thin portable devices like wearables and slim IoT sensors without mechanical interference. |
| Small footprint area | 8.45 mm² - minimizes PCB area consumption while maintaining thermal performance via optimized pad layout per datasheet Figure 6. |
| High surge capability | 200 W peak power (10/1000 µs) - withstands multiple industrial-grade surges without degradation, supporting long-term field reliability. |
| Fast response & low leakage | <1 ns turn-on + <1 µA IR - preserves signal integrity on high-speed lines and extends battery life in energy-constrained edge nodes. |
| Tape-and-reel packaging | 3,000 units/reel - supports automated SMT assembly with consistent orientation (cathode toward sprocket holes) and zero manual handling. |
Applications
| USB 2.0 Data Lines | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting D+ and D− lines in USB host/device ports against ESD discharge during cable insertion or handling. IC Role / Device Role: Unidirectional TVS placed between each data line and ground, with VRWM ≥ 3.3 V and VC ≤ 5.5 V to avoid violating USB transceiver specs. Use Value: SMF16AT1's 26 V clamping is oversized for 5 V USB, but its 16 V VRWM allows safe placement on 3.3 V auxiliary lines (e.g., VBUS detect, ID pin), and its <1 ns response prevents bit errors during hot-plug events. |
Use Scenario: Shielding analog output (4–20 mA) or digital I/O (RS-485) circuits in factory-floor sensors from induced lightning surges and relay-switching transients. IC Role / Device Role: Primary front-end surge protector mounted at connector entry point, shunting energy before it reaches precision op-amps or isolated UART transceivers. Use Value: With 200 W peak power and 26 V clamping, SMF16AT1 limits transient voltage to levels compatible with 30 V-rated isolation barriers and protects 24 V loop-powered sensor electronics from 1 kV/0.5 J surges. |
| Smartphone Camera Module Interface | Automotive Body Control Module (BCM) Inputs |
Use Scenario: Safeguarding MIPI CSI-2 clock and data lanes connecting image sensor to AP, exposed to ESD during module replacement or flex-cable bending. IC Role / Device Role: Low-capacitance (<50 pF at 0 V) unidirectional TVS placed adjacent to connector, grounded to local shield plane to minimize stub inductance. Use Value: SMF16AT1's 8.45 mm² footprint fits tight camera module spacing; its <1 µA leakage avoids loading bias networks; and sub-1 ns response prevents pixel corruption during ESD events. |
Use Scenario: Protecting wake-up inputs (e.g., door handle touch sensors, trunk release switches) connected to 12 V vehicle battery rail from load-dump and jump-start transients. IC Role / Device Role: First-stage clamp on 12 V input, sized to handle ISO 7637-2 Pulse 1 (−150 V, 100 ms) and Pulse 3a/b (±100 V, 150 ns) waveforms. Use Value: SMF16AT1's 16 V VRWM aligns with 12 V nominal systems; its 26 V VC stays below typical BCM input absolute max (36 V); and SOD−123FL allows placement near connector with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Same VRWM (16 V) and VC (26 V), but SMA package (larger footprint: 4.5 × 2.7 mm vs. SOD−123FL's 2.7 × 1.7 mm); 400 W peak power rating. | Better suited for higher-energy surges (e.g., automotive load dump) where board space permits larger package. | Select SMAJ16A if surge energy exceeds 200 W or thermal mass requirements demand larger copper pads. |
| P6SMB16A | Same VRWM and VC, but SMB package (3.6 × 2.7 mm); 600 W peak power; higher IR (≤5 µA @ VRWM). | Preferred for industrial AC/DC power supply inputs where higher clamping consistency across temperature is needed. | Choose P6SMB16A when operating ambient exceeds 105°C or when legacy SMB footprint reuse is required. |
Compared with SMAJ16A and P6SMB16A, SMF16AT1 offers the smallest PCB footprint and lowest leakage, making it optimal for space- and power-constrained portable electronics - whereas the alternatives trade size for higher surge robustness in less dense designs.
Availability
SMF16AT1 is available at Aetrix Electronics and suitable for USB interface protection, industrial sensor I/O hardening, smartphone camera module safeguarding, and automotive body control module inputs requiring stable component supply across high-mix, low-volume production runs.
Supply support for SMF16AT1 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 SMFxxAT1 series belongs to onsemi's transient voltage suppressor product line, engineered specifically for compact, high-reliability overvoltage protection in space-constrained portable and automotive electronics where low leakage and fast response are mandatory.
FAQ
What is the working peak reverse voltage (VRWM) of SMF16AT1, and why does it matter for circuit protection?
The SMF16AT1 has a VRWM of 16 V, meaning it remains non-conductive until reverse voltage exceeds this threshold. This value must be selected to be equal to or greater than the normal operating voltage of the protected line - for example, a 12 V automotive circuit or 15 V industrial sensor supply - ensuring no false triggering during steady-state operation while still providing timely clamping during overvoltage events. Choosing a VRWM too close to the operating voltage risks nuisance conduction; too high reduces clamping margin.
How does the clamping voltage (VC) of SMF16AT1 affect downstream IC reliability?
The SMF16AT1 specifies a maximum clamping voltage (VC) of 26 V at 26 A peak pulse current (10/1000 µs). This is the highest voltage that will appear across the protected line during a worst-case surge. To ensure reliability, this VC must remain below the absolute maximum input voltage rating of the downstream IC - for instance, a microcontroller with a 30 V absolute max rating gains 4 V of margin, allowing safe operation even under repetitive surge stress. Exceeding VC risks permanent gate oxide damage.
Can SMF16AT1 be used for bidirectional transient suppression?
No, SMF16AT1 is a unidirectional TVS diode, designed to clamp only reverse-polarity transients on a positive-rail system. It conducts in forward bias like a standard diode (VF ≈ 1.25 V @ 200 mA) and does not suppress positive-going transients on negative rails or AC signals. For bidirectional protection - such as RS-485 differential pairs or audio lines - a dedicated bidirectional TVS like SMBJ16CA or an array like SP1003-01UTG must be used instead of SMF16AT1.
What is the thermal derating behavior of SMF16AT1 at elevated ambient temperatures?
SMF16AT1's DC power dissipation derates linearly above 25°C at 4.0 mW/°C, with a thermal resistance RθJA of 325°C/W (mounted on recommended FR-4 pad). At 85°C ambient, its usable DC power drops to approximately 165 mW. However, its 200 W peak pulse rating applies only to single, non-repetitive events - for repetitive surges, duty cycle and pulse width must be limited per Figure 5 in the datasheet to prevent junction overheating, especially in enclosed enclosures with poor airflow.
Is SMF16AT1 compliant with major ESD and surge immunity standards?
Yes, SMF16AT1 is explicitly rated for >16 kV Human Body Model (HBM) ESD per ANSI/ESDA/JEDEC JS-001 Class 3, IEC61000−4−2 Level 4 (±8 kV contact, ±15 kV air), and IEC61000−4−4 (40 A, 5/50 ns ring wave). These certifications confirm its suitability for end-equipment compliance testing in consumer, industrial, and automotive applications - provided layout follows best practices: short traces, direct ground connection, and no vias in the TVS current path.
SMF16AT1 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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 7.7A
- 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
SMF16AT1 FAQ
1.How can I place an order for SMF16AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF16AT1 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 SMF16AT1 reliable?
The price and inventory of SMF16AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF16AT1 is usually 5 days.
3.What payment methods are accepted for SMF16AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF16AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF16AT1?
SMF16AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF16AT1 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 SMF16AT1?
For technical support, including SMF16AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF16AT1 requirements.
6.How does Aetrix verify that SMF16AT1 is sourced from the original manufacturer or authorized distributors?
All SMF16AT1 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 SMF16AT1 meets industry standards.
7.What is the process for return or replacement of SMF16AT1?
All SMF16AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF16AT1, 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 SMF16AT1 part is unused and in its original packaging.
Return procedure for SMF16AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF16AT1 Tags
-
ESD9B5.0ST5G
onsemi
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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
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
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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