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onsemi 1SMC22AT3
- Part No.:
- 1SMC22AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC22AT3.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,574
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Product details
Overview
1SMC22AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 22 V working peak reverse voltage (VRWM), 26.9 V minimum breakdown voltage (VBR) at 1 A test current, 35.5 V maximum clamping voltage (VC) at 42.2 A peak pulse current, and sub-1 ns response time. It is used in automotive power line protection and industrial power supply input stages.
For engineers reviewing the 1SMC22AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VDD, surge current capability under 8.3 ms waveform, UL 497B certification for isolated loop circuits, and SMC package thermal performance on FR-4 PCBs.
Technical Context
The 1SMC22AT3 operates as a unidirectional Zener-based TVS diode with avalanche breakdown behavior, triggered when reverse voltage exceeds its specified VBR range (25.65–28.1 V). Its low dynamic impedance and fast <1 ns response enable effective suppression of fast-rising transients without significant overshoot-provided layout minimizes trace inductance.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs waveform), derates linearly above 75°C junction temperature, and exhibits <5 µA leakage at VRWM. The device meets UL 497B for isolated loop circuit protection and Class 3 HBM ESD (>16 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC bus or signal swing. |
| VBR @ IT=1 A | 25.65–28.1 V - Breakdown onset range; defines minimum voltage at which full avalanche conduction initiates. |
| VC @ IPP=42.2 A | 35.5 V - Maximum clamped voltage during 8.3 ms surge; determines peak stress on downstream components. |
| PPK | 1500 W - Peak surge power handling (10/1000 µs); sets single-event robustness limit for lightning or EFT. |
| IR @ VRWM | 5 µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal integrity. |
| Response Time | <1 ns - Time from transient rise to clamping onset; critical for protecting high-speed interfaces and microcontrollers. |
| UL Recognition | UL 497B (QVGQ2 File #E210057) - Certified for use in isolated telecom/data line protectors, not just flammability. |
Pinout & Package
1SMC22AT3 is housed in the SMC (DO-214AB) surface-mount plastic package (Case 403), featuring a molded cathode notch polarity indicator and modified L-bend leads for enhanced solder joint reliability. Thermal resistance is 54.6°C/W junction-to-lead and 165°C/W junction-to-ambient (FR-4 board, min footprint).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to ground or low-impedance return plane; must minimize inductance to reduce overshoot. |
| Cathode | Protected line connection point | Connected to the line being protected (e.g., 24 V rail); polarity notch identifies this terminal physically. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 24 V systems. |
| Clamping ratio VC/VBR ≈ 1.39 | Provides tight voltage control margin-critical for safeguarding 3.3 V or 5 V logic powered from protected rails. |
| UL 497B recognition | Validates suitability for telecom/data line isolation barriers, exceeding basic flammability-only certifications. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 for system-level ESD immunity without additional front-end protection. |
| Pb-free SMC package | Complies with RoHS and JEDEC J-STD-020 reflow profiles (260°C/10 s), supporting automated assembly. |
Applications
| Automotive Power Distribution | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting 24 V CAN bus power lines and sensor supply rails against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional parallel clamp placed between VBAT and chassis ground, activated within nanoseconds of overvoltage event. Use Value: Limits peak voltage to ≤35.5 V, preventing damage to LIN transceivers, microcontrollers, and analog front-ends rated for 36 V absolute maximum. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: TVS diode mounted directly at terminal block entry, shunting induced transients before reaching optocoupler inputs. Use Value: Withstands 1500 W surges while maintaining <5 µA leakage-preserving input threshold accuracy and reducing false triggering. |
| Medical Equipment Power Entry | AC-DC Adapter Secondary Side |
|
Use Scenario: Surge protection on isolated 12–24 V auxiliary power rails inside diagnostic imaging devices. IC Role / Device Role / Timing Role: UL 497B-certified clamping element on secondary-side DC outputs, ensuring compliance with medical safety standards. Use Value: Validated for isolated loop protection enables direct use in SELV circuits without additional barrier components. |
Use Scenario: Output rail protection in wall-mounted AC-DC adapters supplying consumer electronics. IC Role / Device Role / Timing Role: Fast-response TVS placed across +VOUT and GND to suppress flyback spikes from output rectifier recovery. Use Value: Sub-1 ns turn-on prevents voltage overshoot from damaging downstream USB PD controllers or battery management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Same VRWM (22 V) and VC (35.5 V), but lower PPK = 600 W; SMB package has higher RJA (190°C/W vs 165°C/W). | Less suitable for repeated or high-energy surges (e.g., automotive load dump); better for space-constrained layouts where SMC footprint is prohibitive. | Select SMBJ22A only when board area is critical and surge energy remains below 600 W limits. |
| 1.5SMC22A | Identical electrical specs and SMC package, but obsolete ON Semiconductor part; no active UL 497B file renewal post-2018. | Lacks current UL 497B certification-may fail compliance audits for new medical or telecom designs requiring updated safety documentation. | Prefer 1SMC22AT3 for new designs requiring certified, actively supported TVS protection. |
Compared with SMBJ22A and 1.5SMC22A, the 1SMC22AT3 delivers superior surge robustness (1500 W vs 600 W), certified safety compliance (UL 497B QVGQ2), and ongoing manufacturer support-making it the recommended choice for industrial, automotive, and medical applications demanding reliability and audit readiness.
Availability
1SMC22AT3 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC input protection, and medical equipment power entry requiring stable component supply and long-term lifecycle assurance.
Supply support for 1SMC22AT3 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 is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMC22AT3 belongs to the SMC-series transient voltage suppressors-a family engineered for high-energy surge clamping in harsh environments, with emphasis on UL-certified reliability and thermally robust surface-mount packaging.
FAQ
What is the maximum clamping voltage of the 1SMC22AT3 under surge conditions?
The 1SMC22AT3 has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 42.2 A (8.3 ms waveform). This value is guaranteed per the ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure downstream components tolerate at least 35.5 V peak stress. The 1SMC22AT3 achieves this clamping performance while maintaining low leakage (<5 µA) at its 22 V working voltage.
Is the 1SMC22AT3 suitable for bidirectional signal line protection?
No, the 1SMC22AT3 is a unidirectional TVS diode and is not suitable for bidirectional signal line protection such as RS-485 or USB data lines. Its design clamps only in reverse bias above VRWM; forward conduction follows standard silicon diode behavior (~0.7–1.0 V). For bidirectional protection, a dedicated bidirectional TVS like SMAJ22CA or an external series resistor/diode arrangement would be required. The 1SMC22AT3 datasheet explicitly states "Bidirectional devices will not be available in this series."
Does the 1SMC22AT3 have UL 497B certification, and what does that cover?
Yes, the 1SMC22AT3 carries UL 497B recognition (File #E210057, category QVGQ2) for protector applications-not just package flammability. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing under isolated loop conditions. It confirms suitability for telecom/data line isolation barriers and distinguishes the 1SMC22AT3 from competitors with only basic material certifications. UL listing applies to the entire 1SMC5.0AT3 series, including 1SMC22AT3.
What is the thermal resistance and maximum junction temperature for the 1SMC22AT3?
The 1SMC22AT3 has a thermal resistance of 54.6°C/W junction-to-lead (RJL) and 165°C/W junction-to-ambient (RJA) on FR-4 board with ON Semiconductor's recommended minimum footprint. Its operating and storage temperature range is −65°C to +150°C. Derating begins above 75°C for lead temperature and above 25°C for ambient temperature. These values are measured per standardized test conditions in the datasheet and directly impact sustained surge duty cycle capability.
How does the 1SMC22AT3 compare to the older 1.5SMC22A part?
The 1SMC22AT3 replaces the obsolete 1.5SMC22A with identical electrical specifications (VRWM = 22 V, VC = 35.5 V, PPK = 1500 W) and SMC package, but adds active UL 497B certification (QVGQ2 File #E210057) and ongoing manufacturing support. The 1.5SMC22A lacks current UL file maintenance and is no longer recommended for new designs. Both share the same marking code "GEX" and Pb-free "G" suffix, but only the 1SMC22AT3 guarantees compliance with modern safety audit requirements.
1SMC22AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 42.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
1SMC22AT3 FAQ
1.How can I place an order for 1SMC22AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC22AT3 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 1SMC22AT3 reliable?
The price and inventory of 1SMC22AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC22AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC22AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC22AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC22AT3?
1SMC22AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC22AT3 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 1SMC22AT3?
For technical support, including 1SMC22AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC22AT3 requirements.
6.How does Aetrix verify that 1SMC22AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC22AT3 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 1SMC22AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC22AT3?
All 1SMC22AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC22AT3, 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 1SMC22AT3 part is unused and in its original packaging.
Return procedure for 1SMC22AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC22AT3 Tags
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