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onsemi 1SMC43AT3
- Part No.:
- 1SMC43AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC43AT3.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,426
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Product details
Overview
1SMC43AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 43 V working peak reverse voltage (VRWM), 52.8 V breakdown voltage (VBR) at 1 A test current, clamps to ≤69.4 V at 21.6 A peak pulse current, and responds in <1 ns. It is used in industrial power supplies to protect downstream regulators and microcontrollers from ESD and lightning-induced surges.
For engineers reviewing the 1SMC43AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, VRWM alignment with nominal bus voltage (e.g., 36–42 V DC systems), thermal derating above 75°C, and UL 497B recognition for isolated loop safety compliance.
Technical Context
The 1SMC43AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to shunt transient energy away from sensitive circuitry. Its low dynamic impedance and sub-1 ns response ensure effective suppression of fast-rising transients such as ESD (≥16 kV HBM) and inductive switching spikes.
It is rated for 1500 W peak pulse power (10/1000 µs waveform), with thermal performance defined by junction-to-lead resistance (54.6 °C/W) and junction-to-ambient resistance (165 °C/W). The device is Pb-free, housed in an SMC (DO-214AB) package, and marked "GFT" per ON Semiconductor's standard coding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 43 V - Maximum continuous reverse operating voltage; must be ≥ system nominal DC voltage to avoid leakage during normal operation. |
| VBR @ IT=1 A | 50.3–52.8 V - Breakdown onset range; defines minimum voltage at which clamping begins under standardized test conditions. |
| VC @ IPP=21.6 A | ≤69.4 V - Maximum clamped voltage during 10/1000 µs surge; determines worst-case stress on protected ICs. |
| IPP | 21.6 A - Peak pulse current supported at rated clamping voltage; correlates directly with surge energy handling (1500 W). |
| IR @ VRWM | ≤5 µA - Reverse leakage at 43 V; ensures minimal standby power loss and no false triggering in high-impedance circuits. |
| Response Time | <1 ns - Enables suppression of nanosecond-scale ESD events before protected devices experience overstress. |
| ESD Rating | Class 3 (>16 kV HBM) - Meets IEC 61000-4-2 Level 4 for system-level ESD immunity without external shielding. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for use in isolated loop telecom and industrial control protection circuits. |
Pinout & Package
1SMC43AT3 is packaged in ON Semiconductor's Surmetic™ SMC (DO-214AB) case (Case 403-03), a surface-mount plastic package with modified L-bend leads for enhanced solder joint reliability. Cathode is marked by a molded polarity notch on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse transient events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., +48 V rail); carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Supports high-energy surge events common in industrial motor drives and 48 V telecom power distribution. |
| Clamping voltage ≤69.4 V at 21.6 A | Provides 30%+ margin below typical 100 V absolute maximum ratings of 48 V system MOSFETs and controllers. |
| UL 497B recognition (QVGQ2) | Validates suitability for safety-critical isolated loop applications including process instrumentation and fieldbus interfaces. |
| Pb-free SMC package (RoHS compliant) | Enables lead-free reflow assembly per J-STD-020; maximum solder temperature 260°C for 10 seconds. |
| Leakage <5 µA @ 43 V | Prevents measurable loading on high-impedance sensor bias networks or battery-backed monitoring circuits. |
| Response time <1 ns | Ensures clamping activation prior to propagation delay of most MCU I/O pins and analog front-end components. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary overvoltage clamp placed across bulk input capacitor to limit transient excursions to safe levels for downstream buck converters and supervisors. Use Value: Clamps 1500 W surges to ≤69.4 V while maintaining <5 µA leakage-preserving efficiency and enabling compact thermal design without heatsinking. |
Use Scenario: CAN FD data line protection in BCM where ESD and coupled transients threaten transceiver integrity. IC Role / Device Role: Unidirectional TVS placed between CAN_H and ground to absorb common-mode transients without affecting differential signaling. Use Value: Sub-1 ns response and UL 497B certification ensure compliance with automotive EMC requirements (ISO 10605, ISO 16750-2) without compromising signal integrity. |
| Medical Equipment Isolated Power Rails | Telecom Remote Radio Unit (RRU) DC Feeds |
Use Scenario: Secondary-side 24 V isolated output of medical-grade AC/DC adapter powering patient-monitoring analog front ends. IC Role / Device Role: Final-stage transient guard before precision ADC references and op-amp signal chains. Use Value: Low leakage (<5 µA) prevents offset drift in high-gain sensor amplifiers; 69.4 V clamping protects 36 V-rated op-amps from latch-up. |
Use Scenario: -48 V DC feed line to outdoor RRU, subject to lightning-induced surges and induced transients on long cable runs. IC Role / Device Role: Line-to-ground TVS on power entry board, coordinated with upstream gas discharge tube (GDT) for staged protection. Use Value: 1500 W rating handles multi-kA surge currents; UL 497B recognition validates use in telecom safety isolation boundaries per GR-1089-CORE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A (ON Semiconductor) | Same VRWM (43 V) and VBR range, but lower 600 W peak power rating and SMB package (smaller footprint, higher thermal resistance). | Preferred for space-constrained PCBs where surge energy is limited to ≤600 W (e.g., low-power IoT nodes). | Select 1SMC43AT3 when 1500 W surge handling is required; SMBJ43A suits cost-optimized, lower-energy designs. |
| 1.5SMC43A (Littelfuse) | Identical electrical specs (VRWM=43 V, VC≤69.4 V @ 21.6 A, 1500 W), same SMC package, but lacks UL 497B recognition. | Acceptable for non-safety-critical industrial controls where UL certification is not mandated. | Choose 1SMC43AT3 for UL-compliant designs; 1.5SMC43A offers equivalent clamping performance where certification is optional. |
Compared with SMBJ43A and 1.5SMC43A, the 1SMC43AT3 uniquely combines 1500 W surge capability, UL 497B safety listing, and ON Semiconductor's validated SMC package reliability-making it optimal for certified industrial and telecom infrastructure where both energy handling and regulatory compliance are mandatory.
Availability
1SMC43AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom remote radio units requiring stable component supply and long-term lifecycle assurance.
Supply support for 1SMC43AT3 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, sensors, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMC43AT3 belongs to ON Semiconductor's SMC-series Zener TVS family, engineered specifically for high-reliability, high-energy transient suppression in harsh environments-including factory automation, transportation, and outdoor communications infrastructure.
FAQ
What is the clamping voltage of the 1SMC43AT3 under maximum surge conditions?
The 1SMC43AT3 clamps to a maximum of 69.4 V when subjected to its rated peak pulse current of 21.6 A (10/1000 µs waveform). This value is guaranteed per the datasheet's Electrical Characteristics table and represents the worst-case voltage seen by downstream components during a full 1500 W transient event. Designers must verify that this clamping level remains below the absolute maximum voltage rating of all protected devices.
Is the 1SMC43AT3 RoHS compliant and lead-free?
Yes, the 1SMC43AT3 is Pb-free and RoHS compliant. The "G" suffix in its ordering code (1SMC43AT3G) explicitly denotes the Pb-free Surmetic™ SMC package. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and supports lead-free reflow soldering up to 260°C for 10 seconds, as confirmed in the Mechanical Characteristics section of the datasheet.
Does the 1SMC43AT3 have UL recognition, and for what standard?
Yes, the 1SMC43AT3 carries UL 497B recognition under file #E210057 (category QVGQ2) for isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-validating its use in safety-critical telecom and industrial isolation barriers where regulatory approval is mandatory.
What is the maximum reverse leakage current of the 1SMC43AT3 at its working voltage?
The 1SMC43AT3 exhibits a maximum reverse leakage current of 5 µA when biased at its working peak reverse voltage of 43 V (VRWM), measured at 25°C ambient. This ultra-low leakage ensures negligible power loss in always-on monitoring circuits and avoids false triggering in high-impedance sensing paths-critical for battery-powered or precision analog applications.
How does the thermal performance of the 1SMC43AT3 compare between junction-to-lead and junction-to-ambient?
The 1SMC43AT3 has a junction-to-lead thermal resistance (RJL) of 54.6 °C/W and a junction-to-ambient resistance (RJA) of 165 °C/W. This indicates that heat transfer is significantly more efficient through the leads (e.g., to a copper pour or thermal pad) than into ambient air. For reliable operation above 75°C, designers should prioritize thermal vias and copper area under the SMC package rather than relying on airflow alone.
1SMC43AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 21.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
1SMC43AT3 FAQ
1.How can I place an order for 1SMC43AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC43AT3 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 1SMC43AT3 reliable?
The price and inventory of 1SMC43AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC43AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC43AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC43AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC43AT3?
1SMC43AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC43AT3 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 1SMC43AT3?
For technical support, including 1SMC43AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC43AT3 requirements.
6.How does Aetrix verify that 1SMC43AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC43AT3 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 1SMC43AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC43AT3?
All 1SMC43AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC43AT3, 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 1SMC43AT3 part is unused and in its original packaging.
Return procedure for 1SMC43AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC43AT3 Tags
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