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onsemi 1.5SMC47AT3
- Part No.:
- 1.5SMC47AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1.5SMC47AT3.pdf
- Description:
- TVS 1500W 47V UNIDIRECT SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,114
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Product details
Overview
1.5SMC47AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of DC power rails and signal lines. It features a 40.2 V working peak reverse voltage (VRWM), 47 V nominal breakdown voltage (VBR) at 1 mA test current, and clamps to 64.8 V at 23.2 A peak pulse current (IPP), making it suitable for automotive power supply surge protection and industrial I/O interface safeguarding.
For engineers reviewing the 1.5SMC47AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. protected device absolute maximum rating, thermal derating above 75°C, and UL 497B recognition for isolated loop circuit compliance.
Technical Context
The 1.5SMC47AT3 operates as a silicon avalanche diode in reverse-biased mode, triggering conduction when transient voltage exceeds its VBR of 44.7–49.4 V. Its low dynamic impedance (<1 Ω typical) and sub-1 ns response time enable rapid energy shunting during ESD or lightning-induced surges.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal resistance from junction to lead of 54.6 °C/W and junction-to-ambient of 165 °C/W on FR-4 board. The device exhibits a temperature coefficient of 0.101 %/°C for VBR drift and supports forward surge current up to 200 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 40.2 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (VBR) | 44.7–49.4 V @ 1 mA - precise avalanche threshold defining turn-on onset |
| Clamping Voltage (VC) | 64.8 V @ 23.2 A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Leakage Current (IR) | <5 µA @ 40.2 V - negligible standby power loss and minimal loading on source |
| ESD Rating | Class 3 (>16 kV HBM) - meets stringent electrostatic discharge immunity requirements |
| UL Recognition | UL 497B QVGV2 - certified for isolated loop circuit protection in safety-critical systems |
Pinout & Package
1.5SMC47AT3 is housed in an SMC (DO-214AB) surface-mount plastic package (Case 403), featuring a modified L-bend lead form, void-free thermosetting molding, and cathode polarity indicated by a molded notch. Dimensions: 6.60–7.11 mm × 5.59–6.10 mm × 2.92–3.07 mm (L×W×H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in unidirectional clamp configuration |
| Cathode | High-side transient input terminal | Connected to protected line; conducts avalanche current to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic™ package reliability | Void-free transfer-molded construction ensures long-term mechanical stability and solder-joint integrity under thermal cycling |
| Fast response time | <1 ns typical - limits voltage overshoot before clamping engages, critical for protecting fast logic and analog ICs |
| Low zener impedance | <1 Ω dynamic impedance - minimizes clamping voltage rise under high di/dt transients |
| High surge capability | 200 A forward surge rating - withstands repetitive inrush or fault currents without degradation |
| Thermal robustness | Rated for 260°C soldering (10 s) and –65°C to +150°C operating range - supports automotive and industrial reflow profiles |
Applications
| Automotive Power Rail Protection | 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 TVS placed between power rail and chassis ground to clamp transients above 40.2 V. Use Value: Limits voltage to ≤64.8 V during 23.2 A surges, preventing damage to 45 V-rated regulators and microcontrollers. |
Use Scenario: 24 V digital input modules in factory automation subject to inductive switching spikes from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected TVS at field-side connector to absorb 1500 W inductive kickback energy. Use Value: Prevents latch-up or destruction of optocoupler input stages by clamping within 1 ns while maintaining <5 µA leakage at 24 V. |
| Medical Equipment Power Supply Input | Telecom Line Interface Surge Suppression |
Use Scenario: Secondary-side DC output of medical-grade AC/DC converters requiring UL 497B-compliant isolation barrier protection. IC Role / Device Role / Timing Role: UL-recognized TVS installed across isolated DC output to meet IEC 60601-1 transient immunity requirements. Use Value: Provides certified overvoltage protection without compromising creepage/clearance distances due to compact SMC footprint. |
Use Scenario: Ethernet or RS-485 data lines entering building premises subject to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Unidirectional TVS on signal pair referenced to local ground, absorbing common-mode transients. Use Value: Clamps 10/1000 µs surges to 64.8 V before reaching PHY ICs rated for 65 V absolute maximum, ensuring system-level compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A | 600 W peak power, 45 V VRWM, SMB package (smaller footprint, lower surge rating) | Suitable for space-constrained consumer electronics with lower surge exposure | Select when board area is limited and peak surge energy does not exceed 600 W |
| 1.5KE47A | Through-hole DO-201 package, identical 47 V VBR but higher thermal resistance (RJA = 180 °C/W) | Better suited for prototyping or legacy through-hole designs requiring manual assembly | Choose for hand-soldered or wave-soldered boards where SMT placement is impractical |
Compared with SMBJ45A, the 1.5SMC47AT3 delivers 2.5× higher surge power handling and superior thermal performance on FR-4; versus 1.5KE47A, it offers SMT compatibility and 30% lower RJA, enabling denser layouts and improved reliability in automated production.
Availability
1.5SMC47AT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC digital I/O safeguarding, and medical equipment power supply input circuits requiring stable component supply and full traceability.
Supply support for 1.5SMC47AT3 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 power management, analog, sensor, and discrete devices for automotive, industrial, and communications markets.
The 1.5SMC47AT3 belongs to ON Semiconductor's SMC-series transient voltage suppressors, engineered specifically for high-energy surge protection in harsh environments where reliability, UL certification, and consistent clamping performance are mandatory.
FAQ
What is the working peak reverse voltage (VRWM) of the 1.5SMC47AT3?
The 1.5SMC47AT3 has a working peak reverse voltage (VRWM) of 40.2 V. This value defines the maximum continuous DC or peak AC voltage the device can withstand without entering avalanche conduction. It ensures reliable operation below this threshold while allowing sufficient margin above typical 36 V or 40 V system rails before clamping activates.
How does the 1.5SMC47AT3 differ from bidirectional TVS diodes?
The 1.5SMC47AT3 is strictly unidirectional and functions only in reverse-bias avalanche mode - it blocks forward current like a standard diode and clamps only negative transients relative to its cathode. Bidirectional variants (e.g., 1.5SMC47CAT3) would conduct in both directions, but no bidirectional version exists in the 1.5SMCxxAT3 series per ON Semiconductor documentation.
Is the 1.5SMC47AT3 UL 497B recognized?
Yes, the 1.5SMC47AT3 carries UL 497B recognition under file #116110 for isolated loop circuit protection. This certification confirms successful completion of strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - validating its use in safety-critical telecom and medical isolation barriers.
What is the maximum clamping voltage of the 1.5SMC47AT3 at rated peak pulse current?
The 1.5SMC47AT3 clamps to a maximum of 64.8 V at its rated peak pulse current (IPP) of 23.2 A, measured using the standard 10/1000 µs double-exponential waveform. This clamping voltage must be compared directly against the absolute maximum ratings of downstream components to ensure survivability during surge events.
Can the 1.5SMC47AT3 be used in place of the 1.5SMC43AT3 or 1.5SMC51AT3?
The 1.5SMC47AT3 is not a direct replacement for 1.5SMC43AT3 (VRWM = 36.8 V) or 1.5SMC51AT3 (VRWM = 43.6 V) due to its specific 40.2 V VRWM and 47 V VBR. Substitution requires verifying that the protected circuit's operating voltage aligns with 40.2 V and that 64.8 V clamping remains within safe margins - no pin-compatible or functional drop-in claim is supported.
1.5SMC47AT3 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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1.5SMC47AT3 FAQ
1.How can I place an order for 1.5SMC47AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC47AT3 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 1.5SMC47AT3 reliable?
The price and inventory of 1.5SMC47AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC47AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC47AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC47AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC47AT3?
1.5SMC47AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC47AT3 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 1.5SMC47AT3?
For technical support, including 1.5SMC47AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC47AT3 requirements.
6.How does Aetrix verify that 1.5SMC47AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC47AT3 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 1.5SMC47AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC47AT3?
All 1.5SMC47AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC47AT3, 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 1.5SMC47AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC47AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC47AT3 Tags
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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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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