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onsemi 1SMB22CAT3
- Part No.:
- 1SMB22CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB22CAT3.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,954
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Product details
Overview
1SMB22CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 22 V working peak reverse voltage (VRWM), 25.69–27.0 V breakdown voltage (VBR) at 1 mA, clamps to ≤35.5 V at 16.9 A peak pulse current, and responds in <1 ns - deployed in power supplies, automotive ECUs, and industrial control I/O interfaces.
For engineers reviewing the 1SMB22CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC ≤ protected device's absolute maximum rating, UL 497B certification for isolated loop safety, and SMB (DO-214AA) surface-mount compatibility with high-surge industrial environments.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling clamping of positive and negative transients without polarity sensitivity. Its low zener impedance and fast <1 ns response ensure effective suppression of ESD (≥16 kV HBM) and lightning-induced surges per IEC 61000-4-5.
The device uses a planar junction structure in a void-free Surmetic™ thermoset plastic package (Case 403A), rated for –65°C to +150°C operation. Thermal resistance from junction to lead is 40°C/W, supporting 600 W non-repetitive 1 ms pulses at TL = 25°C with derating above 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC/peak AC rail voltage. |
| VBR @ IT=1 mA | 25.69–27.0 V - Zener breakdown threshold range; defines onset of avalanche conduction under controlled test conditions. |
| VC @ IPP=16.9 A | ≤35.5 V - Clamped voltage during 1 ms 10/1000 µs surge; must stay below protected IC's absolute max input rating. |
| PPK | 600 W @ 1 ms - Peak surge power handling; validates robustness against IEC 61000-4-5 Level 4 (4 kV) transients. |
| IR @ VRWM | <5 µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Response Time | <1 ns - Time from transient onset to clamping activation; critical for protecting high-speed logic and analog front-ends. |
| UL Recognition | UL 497B (QVGV2) - Certified for isolated loop circuit protection; meets safety requirements for telecom and industrial isolation barriers. |
Pinout & Package
1SMB22CAT3 is housed in an SMB (DO-214AA) surface-mount package (Case 403A), featuring a bidirectional two-terminal configuration with no polarity marking. The package uses modified L-bend leads for enhanced solder joint reliability on FR-4 PCBs, rated for 260°C/10 s reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Common transient path | Both terminals function identically; connects across protected line-to-line or line-to-ground to clamp bidirectional surges. |
| Case / Body | Non-electrical mechanical interface | Void-free Surmetic™ thermoset plastic housing provides environmental sealing and thermal conduction to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), and floating I/O without polarity concerns. |
| 600 W peak pulse power | Supports compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in properly designed layouts. |
| UL 497B recognition | Validates suitability for safety-critical isolated loop protection in telecom, medical, and industrial control systems. |
| ESD robustness | Class 3 HBM rating (>16 kV) ensures resilience against handling and system-level electrostatic discharge events. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during surge events, reducing stress on downstream MOSFETs, op-amps, and microcontrollers. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails of programmable logic controllers (PLCs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Parallel-connected overvoltage clamp limiting transient excursions to ≤35.5 V during 100 A/100 ms load dump events. Use Value: Prevents latch-up or destruction of upstream DC-DC controllers and downstream FPGA I/O banks by holding rail voltage within safe operating area. |
Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in BCMs exposed to ISO 7637-2 Pulse 1/2a/5a surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to shunt transients before reaching ASIC-level protection networks. Use Value: Maintains signal integrity during 100 V/50 ms transients while meeting automotive EMC requirements without adding series impedance. |
| Medical Equipment Isolated Sensor Interfaces | Telecom DSL Line Card Surge Protection |
|
Use Scenario: Protecting isolated analog front-ends (e.g., patient monitoring ECG leads) compliant with IEC 60601-1 creepage/clearance rules. IC Role / Device Role / Timing Role: UL 497B-certified TVS installed on secondary side of reinforced isolation barrier to suppress coupling transients. Use Value: Enables certified isolation integrity by clamping coupled surges below 35.5 V without compromising creepage distance or dielectric strength. |
Use Scenario: Front-end protection of ADSL/VDSL line interface units (LIUs) connected to unshielded twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional clamp across tip/ring lines to absorb lightning-induced common-mode surges per GR-1089-CORE. Use Value: Survives repeated 10/700 µs surges up to 6 kV while maintaining low capacitance (<100 pF) to preserve high-frequency DSL signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA | Same SMB package, identical VRWM (22 V) and VC (35.5 V), but lower PPK (600 W vs. 600 W); identical UL 497B listing. | No functional difference in surge rating or safety certification; differs only in manufacturer branding and traceability chain. | Select 1SMB22CAT3 when ON Semiconductor's Surmetic™ molding process, extended temperature validation (–65°C), or preferred-device status is required. |
| P6SMB22CA | Same electrical specs (VRWM=22 V, VC≤35.5 V), but legacy P600 package (larger DO-214AB footprint); higher RJA (226°C/W vs. 226°C/W). | Requires PCB layout change due to larger body (7.11 × 6.22 mm vs. 5.21 × 4.57 mm); not drop-in compatible with SMB footprints. | Choose 1SMB22CAT3 for space-constrained designs needing DO-214AA footprint and optimized thermal performance on standard FR-4 pads. |
Compared with SMBJ22CA, 1SMB22CAT3 offers identical electrical performance with ON Semiconductor's preferred-device qualification and Surmetic™ packaging; versus P6SMB22CA, it delivers same protection in 30% smaller area and improved board-level thermal coupling without sacrificing surge margin.
Availability
1SMB22CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical isolated sensor interfaces requiring stable component supply, long-term lifecycle support, and UL-certified surge protection.
Supply support for 1SMB22CAT3 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
1SMB22CAT3 belongs to the SMB-series transient voltage suppressors - engineered for high-energy surge immunity in compact surface-mount form, targeting cost-sensitive yet safety-critical industrial and automotive applications.
FAQ
What is the clamping voltage of the 1SMB22CAT3 under maximum surge conditions?
The 1SMB22CAT3 clamps to a maximum of 35.5 V when subjected to its rated peak pulse current of 16.9 A (10/1000 µs waveform). This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must verify that this clamping voltage remains below the absolute maximum ratings of downstream components. The 1SMB22CAT3 achieves this with low dynamic impedance and fast avalanche response.
Is the 1SMB22CAT3 suitable for bidirectional signal line protection like RS-485?
Yes, the 1SMB22CAT3 is explicitly designed as a bidirectional TVS diode, making it appropriate for protecting balanced differential interfaces such as RS-485, CAN, or LVDS. Its symmetrical breakdown behavior ensures equal clamping on both polarities without polarity marking, and its low capacitance (<100 pF) minimizes signal distortion. The 1SMB22CAT3 is commonly deployed across A/B lines or between line and ground in such applications.
Does the 1SMB22CAT3 have UL certification for safety-critical applications?
Yes, the 1SMB22CAT3 carries UL 497B recognition (File #116110, Category QVGV2) for isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming suitability for telecom, medical, and industrial isolation barriers where regulatory compliance is mandatory. The 1SMB22CAT3 is not rated for surgical implant or life-support systems.
What is the maximum operating temperature range for the 1SMB22CAT3?
The 1SMB22CAT3 is specified for an operating and storage temperature range of –65°C to +150°C. This wide range supports deployment in under-hood automotive environments, industrial motor drives, and outdoor telecom equipment. Derating of peak power begins above 75°C at the lead temperature, and ambient derating applies above 25°C per the published curves. The 1SMB22CAT3 maintains full electrical performance across this entire range when used within thermal limits.
How does the 1SMB22CAT3 compare to unidirectional TVS diodes in circuit design?
The 1SMB22CAT3 eliminates polarity concerns in AC-coupled or floating circuits, simplifying layout and eliminating risk of reverse installation - unlike unidirectional TVS diodes which require correct anode/cathode orientation relative to DC bias. It is ideal for line-to-line protection or ground-referenced AC rails. However, unidirectional variants offer slightly lower leakage in DC-biased applications. The 1SMB22CAT3's bidirectional nature is intrinsic to its Zener-based construction and documented in the "Bi–Directional TVS" marking diagram.
1SMB22CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 16.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 390pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB22CAT3 FAQ
1.How can I place an order for 1SMB22CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB22CAT3 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 1SMB22CAT3 reliable?
The price and inventory of 1SMB22CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB22CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB22CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB22CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB22CAT3?
1SMB22CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB22CAT3 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 1SMB22CAT3?
For technical support, including 1SMB22CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB22CAT3 requirements.
6.How does Aetrix verify that 1SMB22CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB22CAT3 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 1SMB22CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB22CAT3?
All 1SMB22CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB22CAT3, 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 1SMB22CAT3 part is unused and in its original packaging.
Return procedure for 1SMB22CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB22CAT3 Tags
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ESD9B5.0ST5G
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