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onsemi 1.5SMC15AT3
- Part No.:
- 1.5SMC15AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1.5SMC15AT3.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,349
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Product details
Overview
1.5SMC15AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 12.8 V working peak reverse voltage (VRWM), 15 V breakdown voltage (VBR) at 1 mA test current, clamps to 21.2 V at 71 A peak pulse current, and responds in under 1.0 ns. It is used in power supply input stages to protect DC-DC converters and rectifier outputs against ESD and lightning-induced surges.
For engineers reviewing the 1.5SMC15AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling at 1 ms, UL 497B certification for isolated loop protection, and thermal derating above 75°C ambient.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below VRWM (12.8 V), then avalanches sharply at VBR (15 V ±5%) to divert surge current away from downstream circuitry. Its low dynamic impedance ensures stable clamping during fast transients.
The device uses a planar junction structure in a SURMETIC® SMC (Case 403) package with modified L-bend leads, enabling 1500 W non-repetitive peak power dissipation at 25°C with <1.0 ns response time and <5 µA leakage above 10 V. It meets AEC-Q101 for automotive-grade reliability and UL 497B for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage | 12.8 V - maximum continuous DC or peak AC voltage before clamping activates |
| Breakdown Voltage | 15 V @ 1 mA - precise avalanche onset threshold for predictable protection timing |
| Clamping Voltage | 21.2 V @ 71 A - maximum voltage seen by protected circuit during worst-case surge |
| Leakage Current | <5 µA @ 12.8 V - negligible standby power loss and signal interference |
| Response Time | <1.0 ns - limits voltage overshoot during nanosecond-scale transients |
| ESD Rating | Class 3 (>16 kV HBM) - withstands human-body model electrostatic discharge events |
Pinout & Package
1.5SMC15AT3 is housed in an SMC (Case 403) surface-mount package with cathode indicated by a molded polarity notch. The package measures 5.59–6.10 mm × 6.60–7.11 mm × 1.90–2.41 mm (L×W×H) and supports reflow soldering at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Current exit point during reverse avalanche | Connected to protected line; polarity notch identifies this terminal on package body |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection per Underwriters Laboratories File #E210057 |
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and infotainment power rails |
| Pb-Free SURMETIC® Package | Void-free thermosetting plastic housing with corrosion-resistant, solderable leads |
| Low Clamping Ratio | VC/VBR = 21.2/15 = 1.41 - tight voltage margin between trigger and clamp levels |
| High Surge Robustness | Withstands 200 A forward surge (8.3 ms half-sine) without degradation |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS that clamps transients before they reach upstream DC-DC converter ICs. Use Value: Limits voltage to 21.2 V during 71 A surge, preventing latch-up or gate oxide damage in switching regulators rated for 28 V max input. |
Use Scenario: LIN bus or sensor supply line in BCM subjected to ESD events and battery reversal transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V auxiliary rail feeding microcontroller I/O and analog front-end. Use Value: Responds in <1 ns to suppress 15 kV HBM ESD strikes while maintaining <5 µA leakage to preserve low-power sleep mode current budget. |
| Medical Equipment AC/DC Adapter Output | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side 12 V output of medical-grade AC/DC adapter powering patient monitoring sensors. IC Role / Device Role / Timing Role: Final-stage transient suppressor ensuring SELV compliance and immunity to conducted surges per IEC 60601-1. Use Value: UL 497B recognition validates use in isolated loop circuits; clamping at 21.2 V protects low-voltage op-amps and ADC references. |
Use Scenario: DC feed line to PoE-powered Ethernet switch port exposed to lightning-induced surges on building wiring. IC Role / Device Role / Timing Role: Coordinated clamping element in multi-stage protection network alongside gas discharge tubes and series impedance. Use Value: 1500 W peak power rating enables coordination with upstream GDTs; 12.8 V VRWM matches typical 12 V PoE auxiliary rail requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1.5SMC15AT3G | Automotive-grade variant with AEC-Q101 qualification and PPAP documentation support | Required for OEM automotive designs requiring traceable process controls and change management | Select when automotive production compliance (not just reliability) is mandatory |
| 1.5SMC15A | Same electrical specs but supplied in bulk packaging (no tape-and-reel); no "T3" reel suffix | Suitable for prototyping or low-volume manual assembly where automated pick-and-place is not used | Choose for lab evaluation or small-batch builds avoiding reel logistics |
Compared with 1.5SMC15AT3, SZ1.5SMC15AT3G adds automotive process rigor without altering clamping behavior, while 1.5SMC15A omits tape-and-reel convenience but retains identical surge performance and thermal characteristics.
Availability
1.5SMC15AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, medical equipment power rails, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1.5SMC15AT3 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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1.5SMC15AT3 belongs to the SMC-series unidirectional TVS family, engineered for robust transient suppression in harsh environments where high surge immunity, fast response, and regulatory certifications (UL 497B, AEC-Q101) are critical.
FAQ
What is the clamping voltage of the 1.5SMC15AT3 and how is it measured?
The 1.5SMC15AT3 has a maximum clamping voltage (VC) of 21.2 V, measured at a peak pulse current (IPP) of 71 A with a 10/1000 µs waveform. This value represents the highest voltage the device allows across its terminals during a standardized surge event, ensuring downstream components remain within safe operating limits. The 1.5SMC15AT3 achieves this clamping performance while maintaining low dynamic impedance and sub-nanosecond response.
Does the 1.5SMC15AT3 meet automotive qualification standards?
Yes, the 1.5SMC15AT3 is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications such as body control modules and powertrain subsystems. While the base 1.5SMC15AT3 meets these requirements, the SZ-prefix variant (SZ1.5SMC15AT3G) provides additional site-specific control documentation required for Tier 1 OEM production. Both versions share identical electrical specifications and SMC package construction.
How does the 1.5SMC15AT3 differ from bidirectional TVS diodes?
The 1.5SMC15AT3 is strictly unidirectional and conducts only during reverse-biased overvoltage events - it blocks forward current beyond its low forward voltage (~3.5 V). Bidirectional variants (e.g., 1.5SMC15AT3G-B) would clamp in both polarities, which is unnecessary and potentially harmful in DC-coupled applications like 12 V power rails. The 1.5SMC15AT3's unidirectional design optimizes clamping efficiency and minimizes leakage in single-polarity systems.
What is the thermal derating behavior of the 1.5SMC15AT3 above 75°C?
The 1.5SMC15AT3 derates linearly above 75°C ambient temperature at 18.3 mW/°C, reducing its DC power dissipation capability from 4.0 W at 75°C to zero at approximately 195°C. For transient operation, peak pulse power remains 1500 W at 25°C lead temperature but must be reduced per Figure 3 in the datasheet when ambient exceeds 25°C. Proper PCB copper area and airflow are essential to maintain safe junction temperatures during repeated surges.
Is the 1.5SMC15AT3 RoHS and Pb-free compliant?
Yes, the 1.5SMC15AT3 is a Pb-free device manufactured in ON Semiconductor's SURMETIC® package and complies with RoHS Directive 2011/65/EU. The "G" suffix (as in 1.5SMC15AT3G) explicitly denotes Pb-free construction, though the base part number 1.5SMC15AT3 also conforms to lead-free requirements per ON Semiconductor's Pb-Free strategy documentation and soldering guidelines.
1.5SMC15AT3 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:
- -
- Supplier Device Package:
- -
1.5SMC15AT3 FAQ
1.How can I place an order for 1.5SMC15AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC15AT3 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 1.5SMC15AT3 reliable?
The price and inventory of 1.5SMC15AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC15AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC15AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC15AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC15AT3?
1.5SMC15AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC15AT3 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 1.5SMC15AT3?
For technical support, including 1.5SMC15AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC15AT3 requirements.
6.How does Aetrix verify that 1.5SMC15AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC15AT3 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 1.5SMC15AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC15AT3?
All 1.5SMC15AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC15AT3, 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 1.5SMC15AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC15AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC15AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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