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onsemi 1SMB11AT3
- Part No.:
- 1SMB11AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB11AT3.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,658
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Product details
Overview
1SMB11AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, designed for parallel clamping protection of sensitive electronics. It features a 11 V working peak reverse voltage (VRWM), 13.5 V typical breakdown voltage (VBR) at 1.0 mA test current, and clamps to ≤18.2 V at 33.0 A peak pulse current (IPP), making it suitable for automotive power line surge suppression and industrial I/O port protection.
For engineers reviewing the 1SMB11AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, 600 W 1 ms surge capability, UL 497B recognition for isolated loop circuits, and Pb-free SMB package compatibility with automated SMT assembly.
Technical Context
The 1SMB11AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages above its VRWM of 11 V. Its low zener impedance and <1.0 ns response time enable fast suppression of ESD and lightning-induced surges without affecting normal DC operation.
It delivers 600 W peak pulse power per 10/1000 µs waveform, with thermal derating starting at 75°C junction temperature. The device is rated for −65°C to +150°C operating range and supports 100 A non-repetitive forward surge current, confirming robustness in high-energy transient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC voltage. |
| VBR (min/typ/max) | 11.7 V / 12.2 V / 12.85 V @ IT = 1.0 mA - Confirms reliable Zener turn-on threshold for predictable clamping onset. |
| VC @ IPP | ≤18.2 V @ 33.0 A - Clamped voltage during 600 W surge; determines maximum stress on downstream components. |
| IPP | 33.0 A - Peak pulse current supported at 10/1000 µs waveform; defines surge energy handling capacity. |
| IR @ VRWM | ≤5.0 µA - Reverse leakage at 11 V; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| Capacitance (Ctyp) | 1345 pF @ 0 V, 1 MHz - Junction capacitance affects high-frequency noise coupling; relevant for data line protection. |
| ESD Rating | Class 3 (>16 kV HBM) - Validates immunity to human-body-model electrostatic discharge events. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in unidirectional clamping configuration. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail); polarity band identifies this terminal for correct PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles 10/1000 µs transients up to 600 W without failure-sufficient for ISO 7637-2 Pulse 1/2a/5a automotive surges. |
| UL 497B recognition | Validated for isolated loop circuit protection per Underwriters Laboratories, enabling use in certified telecom and industrial safety systems. |
| <1.0 ns response time | Enables sub-nanosecond clamping onset-critical for protecting high-speed interfaces from ESD-induced latch-up. |
| Pb-free Surmetic® package | RoHS-compliant SMB package with corrosion-resistant finish and solderability verified at 260°C for 10 s. |
| Low zener impedance | Ensures stable clamping voltage under varying surge currents-reduces overshoot and improves protection consistency. |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Suppressing load dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges >35 V. Use Value: Limits voltage seen by downstream regulators and microcontrollers to ≤18.2 V, preventing damage during ISO 16750-2 tests. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across input terminals, referenced to common ground. Use Value: Withstands repetitive 600 W surges while maintaining <5 µA leakage at 24 V nominal, preserving input logic thresholds. |
| Medical Equipment Power Supply Input | Telecom Interface Surge Protection |
|
Use Scenario: Safeguarding AC/DC adapter outputs and internal DC distribution rails in diagnostic imaging devices. IC Role / Device Role / Timing Role: Secondary-level TVS on +5 V or +12 V supply lines feeding analog front-ends and sensors. Use Value: UL 497B certification validates compliance with medical isolation barrier requirements for patient-connected equipment. |
Use Scenario: Protecting RS-485 transceiver bus lines in building automation gateways exposed to lightning-induced ground differentials. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1SMB11AT3 used on positive rail only with series impedance. Use Value: 1345 pF capacitance minimally loads 120 Ω differential bus, preserving signal integrity up to 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ11A | Same VRWM (11 V), identical SMB package, but lower 600 W rating applies at TL = 25°C (vs. 75°C for 1SMB11AT3); slightly higher VC (19.9 V @ 31.2 A). | Less thermal margin in high-ambient environments; requires tighter layout thermal management. | Select when cost sensitivity outweighs thermal derating needs and UL 497B is not required. |
| 1.5SMC11A | Higher 1500 W rating, DO-214AB (SMC) package (larger footprint), same VRWM and VBR range; no UL 497B listing. | Occupies more PCB area; suited for higher-energy surges where space permits. | Choose when surge energy exceeds 600 W or legacy SMC footprint is standardized in design. |
Compared with SMBJ11A and 1.5SMC11A, the 1SMB11AT3 offers superior thermal derating (rated at 75°C lead temperature), UL 497B certification for safety-critical loops, and optimized SMB footprint for dense automotive and industrial layouts-making it preferred where regulatory compliance and thermal robustness are prioritized.
Availability
1SMB11AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and medical power supply designs requiring stable component supply, RoHS compliance, and UL-recognized surge protection.
Supply support for 1SMB11AT3 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, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMB11AT3 belongs to the SMB series of unidirectional Zener TVS diodes, engineered specifically for high-reliability transient suppression in harsh environments-including automotive load dump, industrial motor switching, and medical equipment power inputs.
FAQ
What is the clamping voltage of the 1SMB11AT3 under maximum surge conditions?
The 1SMB11AT3 clamps to a maximum of 18.2 V at its rated peak pulse current of 33.0 A (10/1000 µs waveform). This value is specified in the Electrical Characteristics table and represents the upper limit of voltage imposed on protected circuitry during a 600 W transient event. Designers must ensure this clamping voltage remains below the absolute maximum ratings of downstream ICs. The 1SMB11AT3 achieves this performance with low dynamic impedance and fast response.
Is the 1SMB11AT3 suitable for bidirectional transient protection?
No, the 1SMB11AT3 is a unidirectional TVS diode and is not rated for bidirectional surge suppression. Its electrical characteristics-including breakdown voltage, clamping behavior, and leakage-are defined only for reverse-biased operation (cathode positive relative to anode). For bidirectional protection, ON Semiconductor offers the 1SMB11CAT3 variant. Using the 1SMB11AT3 in a bidirectional configuration may result in forward conduction damage or inadequate clamping on negative transients.
Does the 1SMB11AT3 have UL recognition, and for what standard?
Yes, the 1SMB11AT3 carries UL Recognition under UL 497B for Isolated Loop Circuit Protection (File #E210057, Category QVGQ2). This certification confirms successful completion of multiple safety tests including Strike Voltage Breakdown, Endurance Conditioning, Dielectric Withstand, and Discharge testing-specifically validating its use in telecom, industrial control, and medical equipment where galvanic isolation integrity is critical. The "G" suffix denotes Pb-free compliance aligned with this listing.
What is the maximum operating temperature range for the 1SMB11AT3?
The 1SMB11AT3 is rated for an operating and storage temperature range of −65°C to +150°C. Its junction-to-lead thermal resistance is 40°C/W, and power derating begins above 75°C lead temperature (25 mW/°C reduction). At +150°C, the device maintains functional integrity but with reduced surge margin; system-level thermal design must ensure the lead temperature stays within limits during repeated transients. This wide range supports under-hood automotive and industrial edge-node deployments.
How does the 1SMB11AT3 compare to the 1SMB10AT3 in terms of voltage ratings?
The 1SMB11AT3 has a 11 V working peak reverse voltage (VRWM) and 12.2 V typical breakdown voltage (VBR), whereas the 1SMB10AT3 specifies 10 V VRWM and 11.1 V typical VBR. Both share identical 600 W peak power, SMB package, and UL 497B recognition. The 1SMB11AT3 provides higher voltage headroom for 12 V nominal systems experiencing ripple or tolerance stack-up, reducing risk of premature clamping during normal operation while maintaining the same surge-handling capability.
1SMB11AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- 1345pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB11AT3 FAQ
1.How can I place an order for 1SMB11AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB11AT3 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 1SMB11AT3 reliable?
The price and inventory of 1SMB11AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB11AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB11AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB11AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB11AT3?
1SMB11AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB11AT3 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 1SMB11AT3?
For technical support, including 1SMB11AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB11AT3 requirements.
6.How does Aetrix verify that 1SMB11AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB11AT3 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 1SMB11AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB11AT3?
All 1SMB11AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB11AT3, 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 1SMB11AT3 part is unused and in its original packaging.
Return procedure for 1SMB11AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB11AT3 Tags
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