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onsemi SMF26AT1
- Part No.:
- SMF26AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF26AT1.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:5,450
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Product details
Overview
SMF26AT1 from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD−123FL package, designed for overvoltage protection of sensitive electronics. It features a 26 V working peak reverse voltage (VRWM), 42.1 A maximum peak pulse current (IPP), 31.9 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 DC power rails in portable industrial sensors.
For engineers reviewing the SMF26AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. system operating voltage, VC vs. IC absolute maximum ratings, thermal derating under repeated surge conditions, and SOD−123FL footprint compatibility with high-density PCB layouts.
Technical Context
The SMF26AT1 operates as a unidirectional Zener-based TVS diode, conducting only in reverse breakdown during transients while remaining high-impedance under normal bias. Its clamping action begins at VBR = 28.9–31.9 V (tested at IT = 1 mA), with low zener impedance ensuring stable voltage limiting during fast ESD or lightning-induced surges.
It meets IEC61000−4−2 Level 4 (±16 kV contact / ±15 kV air) and IEC61000−4−4 (40 A, 5/50 ns) immunity standards. Thermal performance is defined by RθJA = 325°C/W (on FR-4 with recommended pad), enabling 385 mW steady-state dissipation at TA = 25°C - critical for sustained leakage management in always-on battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26 V - must be ≥ continuous DC operating voltage to avoid leakage-induced power loss |
| VBR (min/max) | 28.9 V / 31.9 V @ IT = 1 mA - defines precise breakdown onset for predictable clamping threshold |
| VC @ IPP | 31.9 V @ 42.1 A - maximum voltage seen by protected IC during worst-case 10/1000 µs surge |
| IPP | 42.1 A - peak surge current capability before clamping voltage exceeds safe system limits |
| Response Time | <1 ns - ensures suppression activation prior to damage in nanosecond-scale ESD events |
| ESD Rating | Class 3 HBM (>16 kV) - qualifies for direct interface protection in handheld device USB/IO ports |
| Package | SOD−123FL - 2.5 × 1.6 mm footprint, 1.0 mm max height, compatible with automated SMT assembly |
Pinout & Package
SOD−123FL surface-mount package with cathode indicated by polarity band; leads are coplanar, matte tin-plated, MSL 1 rated, and qualified for 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink node | Connected to protected line; conducts surge current to ground when VRWM exceeded |
| 2 (Anode) | Reference/ground return | Typically tied to system ground plane; completes clamping path during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL | 1.0 mm max height enables use in ultra-thin consumer wearables and stacked PCB modules |
| 200 W peak pulse power | Supports robust protection against IEC61000−4−4 40 A surges without derating in compact layouts |
| 100% matte Sn lead finish | Ensures reliable solder wetting and eliminates whisker risk in long-life industrial deployments |
| ESD & surge co-certification | Single-device compliance with both IEC61000−4−2 Level 4 and IEC61000−4−4 reduces BOM count vs. dual-stage solutions |
Applications
| Industrial Sensor Interface | USB-C Port Protection |
|---|---|
Use Scenario: 24 V DC-powered pressure sensor module exposed to inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VDD rail and GND to clamp transients induced by nearby relay coils or motor drives. Use Value: Clamps 42.1 A surges to ≤31.9 V, keeping downstream LDO input within its 36 V abs-max rating and preventing brownout resets. |
Use Scenario: USB-C receptacle on portable medical monitor requiring ESD-safe hot-plug capability. IC Role / Device Role / Timing Role: Per-pin TVS on VBUS line to absorb ±15 kV air-gap ESD per IEC61000−4−2 without degrading signal integrity. Use Value: Sub-1 ns response prevents ESD energy from reaching USB PD controller, eliminating latch-up risk during clinical environment cable swaps. |
| Smart Meter Power Input | Automotive Body Control Module |
Use Scenario: AC/DC converter input stage in utility smart meter subjected to lightning-induced surges on mains lines. IC Role / Device Role / Timing Role: Primary TVS on rectified DC bus to limit voltage spikes before bulk capacitor and primary-side controller. Use Value: 200 W peak power rating sustains multiple 10/1000 µs surges without degradation, meeting ANSI C12.1 transient immunity requirements. |
Use Scenario: LIN bus transceiver power supply rail in automotive door module exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary-level TVS after primary 12 V regulator to protect low-voltage logic from residual overshoot. Use Value: 26 V VRWM provides 20% margin above nominal 24 V system, avoiding leakage at elevated ambient temperatures up to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same VRWM (26 V), but SMA package (larger footprint, higher RθJA = 40°C/W) | Lower power density; requires larger PCB area and heatsinking for repeated surges | Choose SMAJ26A only if legacy board layout lacks SOD−123FL clearance or demands higher single-pulse energy handling |
| P6SMB26A | Same VRWM, DO-214AA package, 600 W peak power, higher VC = 42.1 V @ 9.5 A | Higher clamping voltage risks exceeding downstream IC abs-max ratings in low-voltage systems | Prefer P6SMB26A only when system tolerates >42 V clamping and needs higher surge repetition rate due to lower thermal resistance |
Compared with SMAJ26A and P6SMB26A, the SMF26AT1 delivers superior space efficiency and tighter clamping (31.9 V vs. ≥42.1 V), making it optimal for modern compact designs where PCB real estate and voltage margin are constrained - especially in battery-powered and USB-connected devices.
Availability
SMF26AT1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C port protection, and smart meter power inputs requiring stable component supply across multi-year production cycles.
Supply support for SMF26AT1 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 IoT markets.
The SMF26AT1 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 working peak reverse voltage (VRWM) specification for SMF26AT1?
The SMF26AT1 has a VRWM of 26 V, meaning it remains non-conductive up to this DC or continuous peak reverse voltage. This value ensures minimal leakage current during normal operation while providing sufficient margin above typical 24 V industrial rails - a key parameter verified in the official onsemi datasheet revision 0 (March 2003).
How does the clamping voltage VC of SMF26AT1 compare to its breakdown voltage VBR?
The SMF26AT1 exhibits a VBR range of 28.9 V to 31.9 V at 1 mA test current, while its maximum clamping voltage VC is 31.9 V at 42.1 A peak pulse current. This tight convergence indicates low dynamic impedance, enabling highly effective voltage limiting during fast transients - a characteristic confirmed in the "ELECTRICAL CHARACTERISTICS" table of the SMF5.0AT1 Series datasheet.
Is SMF26AT1 suitable for IEC61000−4−2 Level 4 ESD protection?
Yes, the SMF26AT1 is rated for Class 3 Human Body Model (>16 kV) and complies with IEC61000−4−2 Level 4 (±15 kV air, ±8 kV contact). Its sub-1 ns response time and low leakage ensure reliable ESD suppression without interfering with signal integrity - data directly sourced from the "Specification Features" section of the official onsemi documentation.
What is the thermal resistance and steady-state power dissipation of SMF26AT1?
The SMF26AT1 has a junction-to-ambient thermal resistance RθJA of 325°C/W when mounted on FR-4 with the recommended SOD−123FL footprint, yielding a DC power dissipation of 385 mW at TA = 25°C. This value is derived from TJ(max) = 150°C and is validated in the "MAXIMUM RATINGS" table of the datasheet.
Does SMF26AT1 have polarity marking, and how is it oriented in tape-and-reel packaging?
Yes, the SMF26AT1 uses a cathode polarity band for identification, with Pin 1 designated as cathode and Pin 2 as anode. In 8 mm tape-and-reel packaging (3,000 units/reel), the cathode lead is oriented toward the sprocket holes - a mechanical detail specified in the "ORDERING INFORMATION" and "MARKING DIAGRAM" sections of the onsemi SMF5.0AT1 Series datasheet.
SMF26AT1 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- 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
SMF26AT1 FAQ
1.How can I place an order for SMF26AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26AT1 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 SMF26AT1 reliable?
The price and inventory of SMF26AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF26AT1 is usually 5 days.
3.What payment methods are accepted for SMF26AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26AT1?
SMF26AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26AT1 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 SMF26AT1?
For technical support, including SMF26AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26AT1 requirements.
6.How does Aetrix verify that SMF26AT1 is sourced from the original manufacturer or authorized distributors?
All SMF26AT1 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 SMF26AT1 meets industry standards.
7.What is the process for return or replacement of SMF26AT1?
All SMF26AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF26AT1, 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 SMF26AT1 part is unused and in its original packaging.
Return procedure for SMF26AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF26AT1 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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