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onsemi 1SMA26CAT3
- Part No.:
- 1SMA26CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMA26CAT3.pdf
- Description:
- TVS 400W 26V BIDIRECT SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,873
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Product details
Overview
1SMA26CAT3 from ON Semiconductor is a bidirectional 400 W peak power Zener transient voltage suppressor (TVS) diode with a 26 V working peak reverse voltage (VRWM), 30.42 V nominal breakdown voltage (VBR), and 42.1 V clamping voltage (VC) at 9.5 A peak pulse current (IPP). It features <1 ns response time, 16 kV ESD rating (HBM), and is housed in the Surmetic™ SMA package for robust surge protection in DC power rails and signal lines.
For engineers reviewing the 1SMA26CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to protected IC absolute maximum ratings, IPP capability under defined 10/1000 µs waveform, thermal derating above 75°C, and Pb-free compliance for RoHS-constrained designs.
Technical Context
The 1SMA26CAT3 operates as a bidirectional avalanche-clamping device, symmetrically suppressing positive and negative transients without polarity dependence. Its low zener impedance and fast <1 ns response enable effective protection of I/O ports and power inputs against ESD, lightning-induced surges, and inductive switching spikes.
It is rated for 400 W non-repetitive peak power (10/1000 µs waveform), with thermal resistance of 20 °C/W junction-to-lead and 250 °C/W junction-to-ambient (on FR-4 board). The device sustains operation from −65 °C to +150 °C and is qualified for automotive and industrial environments per its surge and ESD specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VBR (Nom) | 30.42 V - Measured at 1.0 mA test current; defines onset of avalanche conduction under controlled DC conditions. |
| VC @ IPP | 42.1 V - Clamping voltage at 9.5 A peak pulse current (10/1000 µs); determines maximum voltage seen by protected load during surge. |
| PPK | 400 W - Peak power dissipation capability for single 1 ms transient; defines energy-handling limit per event. |
| Response Time | <1 ns - Time from transient onset to clamping activation; ensures protection before sensitive ICs experience overstress. |
| ESD Rating | Class 3 (>16 kV) HBM - Confirmed human-body-model ESD immunity; validates robustness against handling and system-level ESD events. |
| TJ Range | −65 °C to +150 °C - Operating junction temperature range; supports deployment in under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: SMA (Case 403B-02), surface-mount plastic package with flat handling surface, low profile, and top-slide/bottom-board mounting flexibility. Cathode polarity notch is not used for polarity identification; device is bidirectional and symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional avalanche terminals | Identical electrical behavior in both directions; no functional anode/cathode distinction - either terminal may connect to line or ground. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns or external biasing. |
| 400 W peak power (10/1000 µs) | Supports high-energy surge suppression in power supply inputs and motor drive control circuits without cascaded devices. |
| <1 ns response time | Activates before most microcontrollers, transceivers, or sensors can be damaged by fast-rising ESD or switching transients. |
| Pb-free Surmetic™ package | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for reflow compatibility. |
| Low zener impedance | Minimizes voltage overshoot during high-di/dt events, improving clamping precision and reducing stress on downstream components. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
Use Scenario: 24 V DC input rail of programmable logic controller (PLC) power supply subjected to load dump and ISO 7637-2 Pulse 5a transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input terminals to limit surge voltage to ≤45 V, protecting upstream rectifier and downstream DC-DC converter. Use Value: 42.1 V clamping at 9.5 A ensures protected circuit remains below 45 V threshold while surviving 400 W peak energy pulses. |
Use Scenario: LIN bus transceiver data line exposed to battery disconnect transients and ESD in door module electronics. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and ground to shunt both positive and negative transients without polarity constraints. Use Value: Symmetrical clamping and <1 ns response prevent data corruption and transceiver latch-up during 15 kV contact ESD events. |
| Medical Equipment Signal Line Protection | POS Terminal Keypad Interface |
Use Scenario: Analog sensor interface (e.g., temperature or pressure) in portable diagnostic device connected to long PCB traces susceptible to ESD coupling. IC Role / Device Role / Timing Role: Localized TVS at connector entry point to clamp fast ESD transients before reaching ADC input or op-amp front-end. Use Value: 16 kV HBM rating and low capacitance (<100 pF typical) preserve signal integrity while meeting IEC 61000-4-2 Level 4 compliance. |
Use Scenario: Matrix keypad scan lines in retail payment terminal exposed to repeated user-contact ESD in public environments. IC Role / Device Role / Timing Role: Discrete TVS per key line to prevent false keypresses, microcontroller reset, or GPIO damage from fingertip discharge. Use Value: Bidirectional operation eliminates need for dual diodes per line; compact SMA footprint enables dense layout on space-constrained overlay PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA | Same VRWM (26 V) and bidirectional configuration, but SMB package (higher 600 W PPK, larger footprint, 28.9–31.9 V VBR range). | Higher surge rating suits 12/36 V automotive power nets; requires PCB redesign due to larger case (SMB vs SMA). | Select when higher energy handling (>400 W) is required and board space permits larger package. |
| 1.5SMC26CA | Same VRWM and bidirectionality, but SMC package (1500 W PPK, 28.9–31.9 V VBR, higher thermal mass). | Used in main power entry stages (e.g., AC/DC front-end, solar charge controllers); not suitable for fine-pitch signal lines. | Choose for primary-level surge protection where 1.5 kW peak power and enhanced thermal stability are critical. |
Compared with SMBJ26CA and 1.5SMC26CA, the 1SMA26CAT3 provides optimal balance of 400 W surge capability, compact SMA footprint, and cost efficiency for secondary-level protection in space-constrained industrial and consumer electronics - without requiring layout changes needed for larger packages.
Availability
1SMA26CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical sensor interfaces, and POS terminal designs requiring stable component supply, RoHS-compliant packaging, and proven surge resilience.
Supply support for 1SMA26CAT3 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient electronics, with leadership in power management, analog, sensing, and connectivity solutions.
The 1SMA26CAT3 belongs to the 1SMAxxCAT3 series of bidirectional TVS diodes engineered for cost-sensitive, high-volume transient suppression in DC power rails and low-voltage signal paths across industrial, automotive, and medical systems.
FAQ
What is the clamping voltage of the 1SMA26CAT3 and how is it measured?
The 1SMA26CAT3 has a clamping voltage (VC) of 42.1 V, measured at a peak pulse current (IPP) of 9.5 A using the standard 10/1000 µs double-exponential surge waveform. This value represents the maximum voltage that appears across the device during a defined transient event and is critical for ensuring protected circuitry remains within safe operating limits. The 1SMA26CAT3 achieves this clamping performance while maintaining low dynamic impedance and sub-nanosecond response.
Is the 1SMA26CAT3 unidirectional or bidirectional, and how does that affect circuit placement?
The 1SMA26CAT3 is a bidirectional transient voltage suppressor, meaning it clamps both positive- and negative-going transients identically across its terminals. There is no functional anode or cathode - either lead may connect to signal or ground. This eliminates polarity concerns during placement and simplifies design for AC-coupled, differential, or floating interfaces. The 1SMA26CAT3's symmetry makes it ideal for LIN, CAN, RS-485, and other bidirectional communication lines.
Does the 1SMA26CAT3 meet RoHS and lead-free soldering requirements?
Yes, the "G" suffix in 1SMA26CAT3 indicates a Pb-free Surmetic™ package compliant with RoHS Directive 2011/65/EU. It supports lead-free reflow soldering up to 260°C for 10 seconds and meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The 1SMA26CAT3 is fully compatible with modern assembly processes and environmental regulations without requiring special handling or exemptions.
What is the thermal derating behavior of the 1SMA26CAT3 above 75°C?
The 1SMA26CAT3 has a DC power dissipation rating of 1.5 W at TL = 75°C, with linear derating of 20 mW/°C above that temperature. Its thermal resistance from junction-to-lead is 20 °C/W, enabling efficient heat transfer to the PCB copper pad. For reliable operation in elevated ambient conditions, designers should follow ON Semiconductor's recommended minimum footprint for Case 403B and verify thermal performance using the pulse derating curve in Figure 3 of the datasheet.
How does the 1SMA26CAT3 compare to the unidirectional 1SMA26AT3 in terms of application suitability?
The 1SMA26CAT3 is bidirectional, while the 1SMA26AT3 is unidirectional - meaning the latter only clamps transients of one polarity and requires correct orientation relative to DC bias. The 1SMA26CAT3 is preferred for AC signals, floating nodes, or systems where voltage polarity reversal is possible (e.g., hot-swap connectors, bidirectional buses). The 1SMA26AT3 is used where strict DC polarity is maintained and lower leakage is prioritized - but the 1SMA26CAT3 offers greater design flexibility without sacrificing clamping performance.
1SMA26CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1SMA26CAT3 FAQ
1.How can I place an order for 1SMA26CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA26CAT3 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 1SMA26CAT3 reliable?
The price and inventory of 1SMA26CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA26CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMA26CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA26CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA26CAT3?
1SMA26CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA26CAT3 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 1SMA26CAT3?
For technical support, including 1SMA26CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA26CAT3 requirements.
6.How does Aetrix verify that 1SMA26CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA26CAT3 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 1SMA26CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMA26CAT3?
All 1SMA26CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA26CAT3, 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 1SMA26CAT3 part is unused and in its original packaging.
Return procedure for 1SMA26CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA26CAT3 Tags
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DESD3V3E1BL-7B
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