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onsemi 1SMC26AT3
- Part No.:
- 1SMC26AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMC26AT3.pdf
- Description:
- TVS DIODE 26V 42.1V SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,599
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Product details
Overview
1SMC26AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel protection of sensitive electronics against ESD, lightning, and inductive load spikes. It features a 26 V working peak reverse voltage (VRWM), 31.9 V typical breakdown voltage (VBR) at 1 A test current, 42.1 V maximum clamping voltage (VC) at 35.6 A peak pulse current, and sub-1 ns response time. It is used in industrial power supplies and automotive control modules requiring robust overvoltage immunity.
For engineers reviewing the 1SMC26AT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, UL 497B-certified loop protection capability, thermal derating curves, SMC package mechanical dimensions, and validated alternative parts for design-in and supply continuity planning.
Technical Context
The 1SMC26AT3 operates as a unidirectional Zener-based TVS diode, triggered when reverse voltage exceeds its 26 V VRWM threshold. Its clamping action limits transient energy to ≤42.1 V at 35.6 A (1 ms pulse), with <5 µA leakage above 10 V and 54.6 °C/W junction-to-lead thermal resistance.
It complies with UL 497B for isolated loop circuit protection and meets Class 3 ESD immunity (>16 kV HBM). The device uses ON Semiconductor's SURMETIC™ SMC (Case 403) package with modified L-bend leads and cathode polarity notch, rated for 260 °C soldering (10 s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 28.9 / 30.4 / 31.9 V @ 1 A - Ensures reliable turn-on margin above system DC rail |
| VC @ IPP | 42.1 V @ 35.6 A - Limits protected circuit voltage during worst-case 1 ms surge |
| PPK | 1500 W @ 1 ms - Handles high-energy transients without failure |
| Response Time | <1 ns - Minimizes voltage overshoot before clamping engages |
| Leakage Current | <5 µA @ 26 V - Prevents excessive standby power loss in high-impedance circuits |
| UL Recognition | UL 497B (QVGQ2) - Certified for use in safety-critical isolated loop protection |
Pinout & Package
Package: SMC (Case 403), surface-mount, void-free thermosetting plastic body with cathode indicated by molded notch. Dimensions: 5.59–6.10 mm (D) × 6.60–7.11 mm (E) × 1.90–2.41 mm (A), lead finish solderable per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to ground or low-impedance return path to complete transient current loop |
| Cathode | Protected line connection | Connected to the voltage rail being safeguarded (e.g., +24 V input); polarity notch identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W Peak Pulse Power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without degradation |
| UL 497B Certification | Validated for telecom and industrial isolated loop protection, including strike voltage and endurance testing |
| ESD Rating >16 kV HBM | Eliminates need for additional ESD protection stages in front-end interfaces |
| Low Clamping Ratio (VC/VBR ≈ 1.39) | Minimizes voltage stress on downstream ICs compared to higher-ratio suppressors |
| SURMETIC™ Package Reliability | Proven moisture resistance and thermal cycling performance in automotive under-hood environments |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rails to clamp transients before they reach upstream rectifier and bulk capacitor. Use Value: Limits voltage to ≤42.1 V during 35.6 A surge, preventing MOSFET gate oxide rupture and electrolytic capacitor overvoltage failure. | Use Scenario: LIN bus or sensor supply line in BCM subjected to ISO 7637-2 pulse 1 and pulse 2a transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V sensor rail, coordinated with series impedance to meet ISO 16750-2 requirements. Use Value: Achieves <1 ns response and UL 497B compliance, enabling single-device protection without secondary filtering. |
| Medical Equipment AC/DC Adapter Interface | Telecom Remote Terminal Unit (RTU) Power Entry |
Use Scenario: Secondary-side 24 V output of medical-grade AC/DC adapter feeding patient-monitoring analog front-end. IC Role / Device Role / Timing Role: Final-stage transient suppressor on low-noise power rail, selected for low leakage (<5 µA) to avoid signal offset drift. Use Value: Maintains <0.1% full-scale error in 24-bit ADC reference paths while surviving 1 kV EFT bursts. | Use Scenario: -48 V DC power entry of outdoor RTU exposed to lightning-induced surges on copper pair feeds. IC Role / Device Role / Timing Role: First-line unidirectional clamp on isolated DC feed, paired with gas discharge tube (GDT) for staged protection. Use Value: 1500 W rating enables coordination with upstream GDT to handle 10/1000 µs surges up to 10 kA without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMC26AT3G | AEC-Q101 qualified; identical electrical specs but automotive-grade traceability and PPAP support | Required for automotive OEM designs needing certified change control and lot traceability | Select SZ1SMC26AT3G when qualifying for Tier 1 automotive programs; otherwise 1SMC26AT3 suffices for industrial use |
| SMCJ26A | Same SMC package, 26 V VRWM, but 1500 W rating with slightly higher VC (42.8 V @ 35.2 A) and no UL 497B listing | Lacks UL recognition for isolated loop protection; suitable only where certification is not mandated | Choose SMCJ26A if UL 497B is unnecessary and cost sensitivity outweighs certification needs |
Compared with SZ1SMC26AT3G, the 1SMC26AT3 offers identical clamping and surge performance but omits automotive-specific documentation and change control; versus SMCJ26A, it adds UL 497B certification critical for telecom and medical isolation barriers, justifying its use where safety standards govern.
Availability
1SMC26AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, medical equipment interfaces, and telecom infrastructure requiring stable component supply and long-term obsolescence management.
Supply support for 1SMC26AT3 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 power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMC26AT3 belongs to the SMC-series unidirectional TVS family, engineered for high-reliability transient suppression in harsh environments where UL 497B compliance, 1500 W surge handling, and sub-1 ns response are mandatory.
FAQ
What is the maximum clamping voltage of the 1SMC26AT3 under a 1 ms surge?
The 1SMC26AT3 has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current of 35.6 A with a 1 ms pulse width. This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the 1SMC26AT3 RoHS-compliant and lead-free?
Yes, the 1SMC26AT3 is manufactured in a Pb-free (RoHS-compliant) SURMETIC™ SMC package. The "T3" suffix denotes tape-and-reel packaging, and ON Semiconductor confirms full compliance with JEDEC JS-066 and EU RoHS Directive 2011/65/EU, with no exemptions applied to lead content.
Does the 1SMC26AT3 require a heatsink for standard operation?
No, the 1SMC26AT3 does not require an external heatsink under normal transient conditions. Its thermal resistance from junction-to-lead is 54.6 °C/W, and it is rated for 4.0 W DC power dissipation at 75 °C lead temperature. Heatsinking is only necessary for repetitive surge duty cycles exceeding derating limits shown in Figure 3 of the datasheet.
How does the 1SMC26AT3 differ from bidirectional TVS diodes?
The 1SMC26AT3 is unidirectional and functions only during reverse-voltage transients - it behaves like a Zener diode above VRWM and conducts forward current below ~1.5 V. Bidirectional variants (e.g., 1SMC26AT3G-B) clamp in both polarities but exhibit higher capacitance and lack UL 497B certification, making the 1SMC26AT3 preferred for DC rail protection with strict leakage and certification requirements.
Can the 1SMC26AT3 be used in place of the 1N6267A?
No - the 1N6267A is a legacy DO-201AB packaged 1500 W TVS with 26 V VRWM but significantly larger footprint, higher thermal resistance (70 °C/W), and no UL 497B listing. The 1SMC26AT3 replaces it in SMC-layout designs requiring surface-mount compatibility, improved thermal performance, and certified loop protection, but PCB redesign is required due to package differences.
1SMC26AT3 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:
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- Operating Temperature:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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1SMC26AT3 FAQ
1.How can I place an order for 1SMC26AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC26AT3 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 1SMC26AT3 reliable?
The price and inventory of 1SMC26AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC26AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC26AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC26AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC26AT3?
1SMC26AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC26AT3 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 1SMC26AT3?
For technical support, including 1SMC26AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC26AT3 requirements.
6.How does Aetrix verify that 1SMC26AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC26AT3 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 1SMC26AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC26AT3?
All 1SMC26AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC26AT3, 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 1SMC26AT3 part is unused and in its original packaging.
Return procedure for 1SMC26AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC26AT3 Tags
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