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onsemi 1SMB11CAT3
- Part No.:
- 1SMB11CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB11CAT3.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
1SMB11CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 11 V working peak reverse voltage (VRWM), 12.27 V nominal Zener breakdown voltage (VBR) at 1.0 mA test current, and clamps to 18.2 V at 33.0 A peak pulse current - enabling robust surge suppression in power supply rails and interface lines.
For engineers reviewing the 1SMB11CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its UL 497B recognition for isolated loop circuit protection, <1 ns response time, 5 µA max leakage above VRWM, and SMB (DO-214AA) surface-mount package compatibility with high-energy transients per 10/1000 µs waveform.
Technical Context
The 1SMB11CAT3 operates as a bidirectional avalanche diode, conducting symmetrically in both polarities once reverse voltage exceeds VBR. Its low zener impedance and fast turn-on (<1 ns) enable effective clamping of ESD and lightning-induced surges without significant overshoot when properly laid out.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs), with thermal resistance from junction to lead (RJL) of 40 °C/W and maximum operating temperature of +150 °C. Derating applies above 75 °C lead temperature or 25 °C ambient, per defined curves in ON Semiconductor's application notes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin for safe operation. |
| VBR (min/typ/max) | 11.1 / 12.27 / 13.5 V @ 1.0 mA - Confirmed breakdown threshold ensures predictable turn-on across production lots and temperature. |
| VC @ IPP | 18.2 V @ 33.0 A - Clamping voltage under full-rated surge defines worst-case protected-circuit overvoltage during transient events. |
| IPP | 33.0 A - Peak pulse current capability directly determines survivability against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges. |
| Leakage (IR) | <5 µA @ 11 V - Low reverse leakage minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| Response Time | <1 ns - Enables suppression before downstream ICs experience damaging overvoltage, critical for USB, RS-485, and PoE interfaces. |
| ESD Rating | Class 3 (>16 kV HBM) - Meets stringent electrostatic discharge immunity requirements for industrial and automotive end equipment. |
Pinout & Package
1SMB11CAT3 is housed in an SMB (DO-214AA) surface-mount plastic package (Case 403A), featuring a modified L-bend lead form for enhanced solder pad contact area and void-free transfer-molded thermosetting construction. Polarity band is not marked due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode side marking absent) | Common terminal for bidirectional conduction | No polarity marking required; terminals are functionally identical and interchangeable in PCB layout. |
| Anode (Cathode side marking absent) | Common terminal for bidirectional conduction | Enables symmetrical clamping on AC lines, differential buses, or unidirectional rails without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal paths (e.g., RS-485, CAN, audio) without polarity-sensitive placement. |
| UL 497B recognition (QVGV2) | Validated for isolated loop circuit protection - satisfies safety certification requirements for telecom and industrial isolation barriers. |
| 600 W peak pulse rating (10/1000 µs) | Withstands high-energy transients common in 48 V telecom power, automotive load dump, and motor drive feedback loops. |
| Low clamping ratio (VC/VBR ≈ 1.49) | Minimizes voltage overshoot relative to breakdown, reducing stress on downstream MOSFETs, op-amps, and microcontroller I/O. |
| Solderable leads & 260°C/10s reflow tolerance | Compatible with standard SMT assembly processes including lead-free reflow, eliminating special handling or post-soldering inspection. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 12 V battery rail in programmable logic controllers exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Parallel-connected TVS providing sub-20 V clamping to protect DC-DC converters and MCU power inputs. Use Value: Limits transient overvoltage to 18.2 V at 33 A, preventing latch-up or gate oxide damage in 20 V-rated input stages. |
Use Scenario: LIN bus line in door module subjected to ESD and inductive switching noise from window motor relays. IC Role / Device Role / Timing Role: Bidirectional shunt device placed at connector entry point to clamp ±15 kV HBM and ±1 kV ISO 7637-2 pulses. Use Value: Responds in <1 ns to suppress fast edges before they propagate into LIN transceiver input, maintaining bus integrity. |
| Medical Equipment Isolated Interfaces | Telecom Line Card Surge Protection |
|
Use Scenario: Isolated analog sensor interface in patient monitoring devices requiring UL 497B-compliant barrier protection. IC Role / Device Role / Timing Role: UL-recognized TVS on secondary-side signal lines to meet creepage/clearance and surge withstand requirements. Use Value: Validated under UL 497B for protector classification - eliminates need for additional external certification testing of the protection scheme. |
Use Scenario: T1/E1 data line protection in central office equipment facing lightning-induced surges on long copper runs. IC Role / Device Role / Timing Role: Primary-level TVS on transformer-coupled line interface, coordinated with gas discharge tube (GDT) upstream. Use Value: 600 W rating handles high-current surges while low VC ensures secondary-side transceivers remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11CA | Same SMB package, identical VRWM (11 V) and VC (18.2 V), but lower 600 W rating is specified per 10/1000 µs vs. generic "peak power" definition. | Approved for automotive AEC-Q101 qualification; preferred where automotive-grade reliability validation is mandatory. | Select SMBJ11CA when AEC-Q101 compliance is required; otherwise 1SMB11CAT3 offers equivalent electrical performance at broader industrial cost point. |
| P6SMB11CA | Same electrical specs and SMB package, but manufactured by STMicroelectronics; VBR tolerance tighter (±5% vs. ±10% typical for ON Semi). | Used in legacy designs with ST-sourced BOMs; identical footprint enables drop-in replacement where qualification allows. | Choose P6SMB11CA for cross-supplier continuity in existing ST-based platforms; verify thermal derating curves match prior validation. |
Compared with SMBJ11CA and P6SMB11CA, the 1SMB11CAT3 provides identical clamping performance and package compatibility while offering UL 497B recognition - a differentiating factor for medical and telecom isolation barrier designs where third-party safety certification is mandatory.
Availability
1SMB11CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical isolated interfaces, and telecom line card surge protection requiring stable component supply and traceable sourcing.
Supply support for 1SMB11CAT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and communications markets.
The 1SMB11CAT3 belongs to the SMB-series transient voltage suppressor family, engineered specifically for high-energy surge protection in space-constrained surface-mount applications where reliability, UL recognition, and fast response are critical.
FAQ
What is the clamping voltage of the 1SMB11CAT3 under maximum surge conditions?
The 1SMB11CAT3 clamps to 18.2 V at its rated peak pulse current of 33.0 A (10/1000 µs waveform). This value is measured and guaranteed per ON Semiconductor's electrical characteristics table and defines the maximum voltage seen by protected circuitry during a full-rated transient event. The 1SMB11CAT3 maintains this clamping performance across its operating temperature range when mounted per recommended footprint.
Is the 1SMB11CAT3 unidirectional or bidirectional, and how does that affect PCB layout?
The 1SMB11CAT3 is a bidirectional TVS diode, meaning it clamps symmetrically for both positive and negative voltage excursions. As a result, no polarity marking is present on the device, and either end may be connected to either side of the protected line - simplifying layout and eliminating orientation errors during automated assembly. This makes the 1SMB11CAT3 ideal for AC signals, differential buses, and floating grounds.
Does the 1SMB11CAT3 meet UL safety standards, and which specific certification applies?
Yes, the 1SMB11CAT3 carries UL 497B recognition under file #116110 for protectors (QVGV2 category). This certification validates its use in isolated loop circuit protection - covering tests such as strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance. Unlike basic flammability-only recognition, UL 497B confirms functional safety compliance for surge suppression in telecom and industrial isolation barriers.
What is the maximum operating temperature and thermal derating behavior of the 1SMB11CAT3?
The 1SMB11CAT3 has a maximum junction temperature of +150 °C and is rated for DC power dissipation of 3.0 W at 75 °C lead temperature, derating linearly at 25 mW/°C above that point. At 25 °C ambient, its DC dissipation is 0.55 W, derating at 4.4 mW/°C. These values are defined in the "Maximum Ratings" table and must be applied alongside pulse derating curves when designing for repetitive surge conditions.
Can the 1SMB11CAT3 replace older SMA-package TVS diodes in existing designs?
No - the 1SMB11CAT3 uses the larger SMB (DO-214AA) package, not SMA (DO-214AC). While both are surface-mount, SMB has greater thermal mass and higher surge capability (600 W vs. typically 400 W for SMA), but requires a different PCB footprint. Direct replacement would necessitate layout revision unless the original design already used SMB or included compatible pad geometry. Always verify mechanical fit and thermal performance before substitution.
1SMB11CAT3 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 740pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB11CAT3 FAQ
1.How can I place an order for 1SMB11CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB11CAT3 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 1SMB11CAT3 reliable?
The price and inventory of 1SMB11CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB11CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB11CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB11CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB11CAT3?
1SMB11CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB11CAT3 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 1SMB11CAT3?
For technical support, including 1SMB11CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB11CAT3 requirements.
6.How does Aetrix verify that 1SMB11CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB11CAT3 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 1SMB11CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB11CAT3?
All 1SMB11CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB11CAT3, 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 1SMB11CAT3 part is unused and in its original packaging.
Return procedure for 1SMB11CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB11CAT3 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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