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onsemi 1SMB16AT3
- Part No.:
- 1SMB16AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB16AT3.pdf
- Description:
- TVS DIODE 16VWM 26VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,959
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Product details
Overview
1SMB16AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, with 16 V working peak reverse voltage (VRWM), 19.7 V breakdown voltage (VBR) at 1.0 mA test current, and 26.0 V clamping voltage (VC) at 23.1 A peak pulse current. It protects sensitive electronics in power supplies and industrial control systems against ESD and lightning-induced surges.
For engineers reviewing the 1SMB16AT3 datasheet, pinout, applications, or equivalent options, this device is selected for robust overvoltage protection where fast response (<1.0 ns), low leakage (<5.0 µA above 10 V), and UL 497B certification for isolated loop circuits are required.
Technical Context
The 1SMB16AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients. Its design centers on high-energy surge handling (600 W @ 1 ms, 10/1000 µs waveform) and low dynamic impedance to limit voltage overshoot during fast-rising events.
It features a thermally optimized Surmetic SMB package (Case 403A) with modified L-bend leads for enhanced solder joint reliability and thermal dissipation. The device meets Class 3 ESD rating (>16 kV HBM) and is Pb-free compliant per J-STD-609.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 600 W @ 1 ms pulse - handles high-energy transients like lightning surges without failure |
| Working Peak Reverse Voltage (VRWM) | 16 V - sets maximum continuous operating voltage before clamping activates |
| Breakdown Voltage (VBR) | 19.7 V min @ IT = 1.0 mA - defines precise avalanche onset threshold under DC test conditions |
| Clamping Voltage (VC) | 26.0 V @ IPP = 23.1 A - limits protected circuit voltage during worst-case surge event |
| Response Time | <1.0 ns - ensures sub-nanosecond turn-on to suppress fast ESD and switching spikes |
| Leakage Current (IR) | <5.0 µA @ VRWM - minimizes standby power loss and avoids false triggering in high-impedance circuits |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for system-level ESD immunity |
| UL Recognition | UL 497B (QVGQ2) - certified for use in isolated loop circuit protection per safety standard |
Pinout & Package
SMB package (Case 403A), surface-mount, void-free thermosetting plastic body with cathode polarity band. Dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H); lead pitch 3.56 mm; modified L-bend leads for improved pad contact area and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., VBUS, signal line) - polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic SMB packaging | High-reliability, cost-effective molded plastic housing with optimized thermal path to PCB copper |
| Low clamping ratio (VC/VBR) | 1.32 - tight voltage margin between breakdown and clamping ensures minimal overvoltage stress on downstream ICs |
| UL 497B recognition | Validated for protector-class isolation in telecom and industrial loop circuits - not just flammability compliance |
| Pb-free construction | RoHS-compliant (1SMB16AT3G suffix) with compatible reflow profile up to 260°C for 10 s |
| High surge current capability | 23.1 A peak pulse current - supports repeated surge events in harsh environments like factory automation |
Applications
| Industrial Power Supplies | Automotive ECUs |
|---|---|
Use Scenario: Input stage of 24 V DC-DC converters exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rails to clamp surges before they reach regulator ICs. Use Value: Clamps 26.0 V at 23.1 A, protecting downstream PMICs rated for ≤30 V absolute max, while surviving >1000 surges per MIL-STD-1275E. | Use Scenario: CAN bus power line (VCC_CAN) in engine control units subject to ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail feeding CAN transceivers. Use Value: Sub-1 ns response prevents voltage overshoot from exceeding transceiver's 36 V tolerance, validated per AEC-Q101 stress testing. |
| Medical Equipment Interfaces | Communication System Ports |
Use Scenario: USB or RS-232 interface lines in diagnostic imaging devices requiring UL 497B-certified isolation. IC Role / Device Role / Timing Role: Secondary protection device after primary common-mode choke, ensuring differential-mode surge suppression. Use Value: UL 497B QVGQ2 listing confirms suitability for patient-connected equipment isolation barriers, reducing certification effort. | Use Scenario: Ethernet PHY power rail (3.3 V or 5 V) in industrial switches exposed to induced lightning surges. IC Role / Device Role / Timing Role: Localized clamping element adjacent to PHY IC to minimize trace inductance effects. Use Value: 26.0 V clamping voltage ensures PHY ICs (e.g., DP83848) remain within 30 V absolute max rating even during 10/1000 µs 1 kV surge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ16A | Same VRWM (16 V), but 600 W peak power, 26.0 V VC @ 23.1 A - identical electrical specs; different marking and minor package tolerance stack-up | No functional difference in clamping performance or footprint compatibility | Drop-in alternative with identical SMB case outline and thermal profile; preferred by some distributors for inventory consolidation |
| P6SMB16A | Same VRWM (16 V), 600 W rating, but 26.5 V VC @ 22.7 A - slightly higher clamping voltage and lower surge current | Marginally reduced protection level for ultra-sensitive 3.3 V logic rails | Valid alternative where 0.5 V higher clamping is acceptable; widely available but lacks UL 497B recognition |
Compared with SMBJ16A and P6SMB16A, the 1SMB16AT3 offers identical surge handling and tighter clamping, plus UL 497B certification critical for medical and telecom isolation - making it the preferred choice where safety compliance drives design validation.
Availability
1SMB16AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, medical equipment interfaces, and communication system ports requiring stable component supply and long-term lifecycle support.
Supply support for 1SMB16AT3 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1SMB16AT3 belongs to the SMB series of unidirectional Zener TVS diodes, engineered specifically for high-reliability transient suppression in harsh environments - emphasizing surge robustness, fast response, and safety certification for mission-critical systems.
FAQ
What is the clamping voltage of the 1SMB16AT3 at its rated peak pulse current?
The 1SMB16AT3 has a maximum clamping voltage (VC) of 26.0 V at 23.1 A peak pulse current (IPP), measured using the standard 10/1000 µs waveform. This value ensures protected circuits remain below critical voltage thresholds during surge events, and is confirmed in the Electrical Characteristics table on page 3 of the official ON Semiconductor datasheet for the 1SMB5.0AT3 Series.
Is the 1SMB16AT3 RoHS-compliant and lead-free?
Yes, the 1SMB16AT3 is available in a Pb-free version designated as 1SMB16AT3G, fully compliant with RoHS Directive 2011/65/EU and J-STD-609. The device supports standard reflow profiles with a maximum soldering temperature of 260°C for 10 seconds, and its Surmetic SMB package uses environmentally compliant molding compounds - all verified in ON Semiconductor's official packaging documentation.
Does the 1SMB16AT3 have UL recognition, and for what standard?
The 1SMB16AT3 carries UL 497B recognition under file #E210057, specifically certified for protector-class applications in isolated loop circuits. This goes beyond basic flammability testing and includes validation for strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - making it suitable for safety-critical medical and telecom infrastructure where regulatory compliance is mandatory.
What is the thermal resistance from junction-to-lead (RJL) for the 1SMB16AT3?
The thermal resistance from junction-to-lead (RJL) for the 1SMB16AT3 is 40°C/W, measured with zero lead length on a 1 in² copper pad (FR-4 board). This parameter enables accurate thermal modeling when mounting the device on PCBs with thermal relief patterns or copper pours, and directly supports derating calculations for sustained surge duty cycles per Figure 3 in the datasheet.
How does the 1SMB16AT3 differ from bidirectional TVS diodes like the 1SMB16CAT3?
The 1SMB16AT3 is unidirectional and functions only during reverse-bias surges, behaving as a low-leakage diode in forward bias. In contrast, the 1SMB16CAT3 is bidirectional and clamps surges of either polarity - making it suitable for AC lines or differential data signals. The 1SMB16AT3's unidirectional architecture delivers lower capacitance and tighter clamping for DC power rails, while the bidirectional variant sacrifices some clamping precision for symmetrical protection.
1SMB16AT3 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):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 23.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 965pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB16AT3 FAQ
1.How can I place an order for 1SMB16AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB16AT3 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 1SMB16AT3 reliable?
The price and inventory of 1SMB16AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB16AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB16AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB16AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB16AT3?
1SMB16AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB16AT3 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 1SMB16AT3?
For technical support, including 1SMB16AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB16AT3 requirements.
6.How does Aetrix verify that 1SMB16AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB16AT3 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 1SMB16AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB16AT3?
All 1SMB16AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB16AT3, 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 1SMB16AT3 part is unused and in its original packaging.
Return procedure for 1SMB16AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB16AT3 Tags
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