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onsemi 1SMB15AT3
- Part No.:
- 1SMB15AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMB15AT3.pdf
- Description:
- TVS DIODE 15V 24.4V SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,716
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Product details
Overview
1SMB15AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, designed for parallel clamping protection of DC power rails and signal lines. It features a 15 V working peak reverse voltage (VRWM), 24.4 V maximum clamping voltage at 24.0 A peak pulse current (VC @ IPP), and <1.0 ns response time - deployed in automotive power supplies, industrial control I/O modules, and medical equipment surge protection circuits.
For engineers reviewing the 1SMB15AT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, real-world clamping behavior, UL 497B certification status, SMB package mechanical dimensions, and direct alternatives with documented parameter divergence - all specific to the 1SMB15AT3 variant.
Technical Context
The 1SMB15AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its 16.4 V nominal breakdown voltage (VBR @ IT = 1.0 mA). Its low zener impedance and fast junction response enable sub-nanosecond turn-on under ESD or lightning-induced surges.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and maintains <5.0 µA leakage at VRWM - making it suitable for high-reliability DC bus protection where low standby loss and robust surge margin are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin for safe operation. |
| VBR (min/typ/max) | 15.6 / 16.4 / 17.2 V @ IT = 1.0 mA - Confirmed Zener breakdown range ensures predictable turn-on threshold across temperature and unit variation. |
| VC @ IPP | 24.4 V @ 24.0 A - Measured clamping voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected ICs. |
| PPK | 600 W @ 1.0 ms - Peak transient energy handling capacity; determines survivability against IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | 5.0 µA max - Low reverse leakage preserves efficiency in battery-backed or low-power systems. |
| Response Time | <1.0 ns - Junction-limited switching speed enables effective suppression of fast-rising ESD events (IEC 61000-4-2). |
| ESD Rating | Class 3 (>16 kV HBM) - Validated human-body-model robustness for handling-sensitive board assembly environments. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for isolated loop circuit protection in telecom and industrial safety-critical applications. |
Pinout & Package
1SMB15AT3 uses the SMB (Case 403A) surface-mount plastic package: void-free thermosetting body, modified L-bend leads, cathode indicated by polarity band, and RoHS-compliant Pb-free construction (G suffix). Mounting position is unrestricted; max solder temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping (unidirectional mode) | Connected to lower-potential side (e.g., GND or return path); defines directionality of protection. |
| Cathode | Current exit terminal during clamping; marked with polarity band | Connected to protected line (e.g., 12 V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 4 kV without failure in properly designed layouts. |
| 24.4 V clamping at 24 A | Ensures downstream 24 V logic or analog circuits remain below absolute maximum ratings during transient events. |
| UL 497B recognition | Validates compliance for use in certified telecom and industrial isolators - eliminates need for additional safety testing. |
| <1.0 ns response time | Minimizes voltage overshoot before clamping engages, critical for protecting high-speed interfaces like CAN or RS-485. |
| Pb-free Surmetic package | Meets RoHS Directive 2011/65/EU and supports lead-free reflow profiles (J-STD-020). |
Applications
| Automotive Power Distribution | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤24.4 V, preventing damage to MCU power pins and CAN transceivers rated for 36 V absolute max. |
Use Scenario: 24 V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input channel to absorb induced surges from relay coil flyback or EMI coupling. Use Value: Maintains <5 µA leakage at 24 V nominal, avoiding false triggering while clamping 1 kV/500 A transients per IEC 61000-4-5. |
| Medical Equipment Power Entry | Telecom Line Interface Protection |
Use Scenario: AC/DC adapter output stage feeding sensitive analog front-ends in patient monitoring devices. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp after filtering, before LDO regulators. Use Value: UL 497B certification confirms suitability for isolated loop protection in Class II medical power supplies per IEC 60601-1. |
Use Scenario: Protection of Ethernet PHY or xDSL line drivers connected to external wiring. IC Role / Device Role / Timing Role: Primary surge limiter on tip/ring lines, coordinated with gas discharge tubes (GDTs) for staged protection. Use Value: 24.4 V clamping aligns with 25 V-rated Ethernet magnetics and PHY IO tolerances, enabling compact two-stage designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | Same VRWM (15 V), but higher VC = 24.4 V @ 24.4 A; identical SMB package and 600 W rating. | No functional difference in clamping performance; minor variation in test current (IT = 1 mA vs. 1 mA) and thermal resistance (RJA = 226 °C/W). | Select SMBJ15A if sourcing from STMicroelectronics or requiring dual-sourcing with identical electrical envelope. |
| 1.5SMC15A | Higher package thermal mass (SMC, 7.1 mm × 6.2 mm); same VRWM and VC, but PPK = 1500 W - over-spec'd for most 600 W use cases. | Requires PCB layout change (larger footprint); better suited for high-temperature ambient (>100°C) or repeated surge environments. | Choose 1.5SMC15A only when extended thermal margin or legacy SMC footprint compatibility is mandatory. |
Compared with 1SMB15AT3, SMBJ15A offers functionally identical protection in an alternate SMB-sourced part, while 1.5SMC15A trades smaller size for higher surge capacity and larger board area - neither is pin-compatible due to differing case outlines, and both require validation of layout and thermal derating.
Availability
1SMB15AT3 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC digital I/O protection, and medical equipment power entry requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1SMB15AT3 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 manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and communications markets.
The 1SMB15AT3 belongs to the SMB-series unidirectional TVS family, engineered for cost-effective, high-reliability transient suppression in space-constrained surface-mount applications where UL 497B certification and sub-ns response are essential.
FAQ
What is the clamping voltage of the 1SMB15AT3 under standard surge conditions?
The 1SMB15AT3 has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current of 24.0 A (10/1000 µs waveform). This value is measured per ON Semiconductor's test methodology and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1SMB15AT3 RoHS compliant and lead-free?
Yes, the "G" suffix in 1SMB15AT3 indicates a Pb-free Surmetic package compliant with RoHS Directive 2011/65/EU. The device uses lead-free terminations and meets J-STD-020 moisture sensitivity level (MSL) requirements for standard reflow soldering, with maximum solder temperature specified at 260°C for 10 seconds.
Does the 1SMB15AT3 have UL recognition, and for what standard?
Yes, the 1SMB15AT3 carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification validates performance in dielectric withstand, strike voltage breakdown, endurance conditioning, and discharge testing - confirming suitability for safety-critical telecom and industrial isolation applications.
What is the maximum reverse leakage current of the 1SMB15AT3 at its working voltage?
The 1SMB15AT3 specifies a maximum reverse leakage current (IR) of 5.0 µA when biased at its working peak reverse voltage (VRWM) of 15 V. This low leakage ensures minimal power loss in always-on or battery-powered systems and avoids false triggering in high-impedance sensing circuits.
How does the 1SMB15AT3 differ from bidirectional TVS diodes like the 1SMB15CAT3?
The 1SMB15AT3 is unidirectional and functions only during reverse overvoltage events, while the 1SMB15CAT3 is bidirectional and clamps both positive and negative transients. The 1SMB15AT3 has lower capacitance and is preferred for DC power rail protection, whereas the CAT3 version suits AC signal lines or differential buses where polarity reversal occurs.
1SMB15AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
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1SMB15AT3 FAQ
1.How can I place an order for 1SMB15AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB15AT3 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 1SMB15AT3 reliable?
The price and inventory of 1SMB15AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB15AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB15AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB15AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB15AT3?
1SMB15AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB15AT3 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 1SMB15AT3?
For technical support, including 1SMB15AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB15AT3 requirements.
6.How does Aetrix verify that 1SMB15AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB15AT3 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 1SMB15AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB15AT3?
All 1SMB15AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB15AT3, 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 1SMB15AT3 part is unused and in its original packaging.
Return procedure for 1SMB15AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB15AT3 Tags
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