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onsemi 1.5SMC43AT3
- Part No.:
- 1.5SMC43AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC43AT3.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,411
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Product details
Overview
1.5SMC43AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 36.8 V working peak reverse voltage (VRWM), 43 V nominal Zener breakdown voltage (VBR) at 1 mA test current, clamps to ≤59.3 V at 25.3 A peak pulse current (IPP), and responds in <1.0 ns-used in automotive power supply input stages and industrial PLC I/O modules.
For engineers reviewing the 1.5SMC43AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin above operating voltage, clamping ratio (VC/VBR = 1.38), UL 497B certification for isolated loop protection, and SMC package thermal performance under repetitive surge conditions.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device: when transient voltage exceeds VBR (43 V ±5%), it avalanches into low-impedance conduction, diverting surge current away from protected circuitry. Its SMC surface-mount package delivers 54.6 °C/W junction-to-lead thermal resistance and supports 200 A forward surge current (IFSM) per half-sine pulse.
Clamping behavior is defined by VC = 59.3 V at IPP = 25.3 A (10/1000 µs waveform), with leakage <5 µA at VRWM and temperature coefficient of 0.101 %/°C. It meets ESD Class 3 (>16 kV HBM) and UL 497B for isolated loop circuit protection-critical for telecom interface ports and automotive body control modules.
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) | 36.8 V - sets minimum operating voltage margin before clamping begins |
| Zener Breakdown Voltage (VBR) | 43 V @ 1 mA - precise avalanche threshold for predictable turn-on |
| Clamping Voltage (VC) | 59.3 V @ 25.3 A - maximum voltage seen by protected load during surge |
| Leakage Current (IR) | <5 µA @ 36.8 V - negligible standby power loss in always-on systems |
| Response Time | <1.0 ns - limits voltage overshoot before suppression engages |
| ESD Rating | Class 3 (>16 kV HBM) - withstands human-body model electrostatic discharge events |
Pinout & Package
1.5SMC43AT3 uses the SMC (Case 403) surface-mount package: void-free thermosetting plastic body, cathode indicated by molded notch, modified L-bend leads for enhanced pad adhesion, and 260°C soldering tolerance for 10 seconds. Dimensions: 5.59–6.10 mm (D) × 6.60–7.11 mm (E) × 1.90–2.41 mm (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current return path | Connected to system ground or low-side reference; completes shunt path during avalanche |
| Cathode | Protected line connection | Connected to rail being protected (e.g., 24 V supply); polarity must match unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection-enables use in telecom/data line interfaces without additional certification effort |
| Low Clamping Ratio | VC/VBR = 1.38 - minimizes stress on downstream components during surge events |
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and infotainment power inputs |
| Pb-Free SURMETIC® Package | RoHS-compliant, corrosion-resistant finish with solderable leads-supports lead-free reflow and long-term reliability |
| High Surge Robustness | 200 A non-repetitive forward surge rating - handles severe load-dump or inductive switching events |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rail in body control module against ISO 7637-2 load dump transients. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly across input terminals to clamp surges before they reach DC/DC converter. Use Value: Limits voltage to ≤59.3 V during 25.3 A transients-prevents damage to 36 V-rated input capacitors and controller ICs. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected between input terminal and common rail to absorb fast-rising EFT/burst noise. Use Value: Sub-1 ns response ensures clamping initiates before microcontroller GPIO pins experience overstress beyond absolute maximum ratings. |
| Telecom Interface Port Protection | Medical Equipment Power Supply Input |
Use Scenario: Shielding RS-485 transceiver power pins in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail feeding isolated data interface ICs. Use Value: UL 497B recognition validates compliance for isolated loop protection-reduces certification burden for end equipment. |
Use Scenario: Securing auxiliary 12 V/24 V power input in diagnostic imaging subsystems against ESD and switching noise. IC Role / Device Role / Timing Role: Final-stage TVS on secondary-side power distribution network before sensitive analog front-end supplies. Use Value: <5 µA leakage at 36.8 V prevents interference with low-noise sensor bias networks and preserves signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1.5SMC43AT3G | Automotive-grade variant with AEC-Q101 qualification and PPAP capability; identical electrical specs and SMC package | Required for automotive OEM designs requiring traceable process controls and change management | Select SZ1.5SMC43AT3G when automotive qualification documentation and manufacturing site control are mandatory |
| 1.5SMC43A | Same electrical parameters but supplied in bulk (not tape-and-reel); no "T3" reel suffix or Pb-free marking | Suitable for prototyping or low-volume assembly where reel packaging and RoHS compliance are not required | Choose 1.5SMC43A only for internal evaluation or non-production builds lacking RoHS or automated placement needs |
Compared with 1.5SMC43AT3, SZ1.5SMC43AT3G adds automotive process rigor without altering clamping performance, while 1.5SMC43A omits tape-and-reel packaging and Pb-free assurance-making it unsuitable for volume production or regulated markets.
Availability
1.5SMC43AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom infrastructure, and medical power supply designs requiring stable component supply and full RoHS compliance.
Supply support for 1.5SMC43AT3 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, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The 1.5SMC43AT3 belongs to the SMC-series transient voltage suppressors-designed specifically for high-energy surge protection in harsh environments where reliability, UL certification, and fast response are critical.
FAQ
What is the clamping voltage of the 1.5SMC43AT3 under maximum surge conditions?
The 1.5SMC43AT3 clamps to 59.3 V at its rated peak pulse current of 25.3 A (10/1000 µs waveform). This value is measured per standard test conditions in the ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during transient events. The 1.5SMC43AT3 maintains this clamping performance across its qualified temperature range of −65 °C to +150 °C.
Is the 1.5SMC43AT3 suitable for automotive applications?
Yes-the 1.5SMC43AT3 is manufactured by ON Semiconductor and shares the same electrical specifications and SMC package as the AEC-Q101-qualified SZ1.5SMC43AT3G. While the 1.5SMC43AT3 itself is not explicitly certified, its design lineage, construction, and test data align with automotive requirements. For formal qualification, the SZ-prefix variant is recommended.
Does the 1.5SMC43AT3 have UL recognition?
Yes-the entire 1.5SMC43AT3 series carries UL 497B recognition (File #E210057) for isolated loop circuit protection. This certification covers tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-validating its use in telecom and industrial safety-critical interfaces.
What is the thermal resistance of the 1.5SMC43AT3 package?
The 1.5SMC43AT3 has a junction-to-lead thermal resistance (RJL) of 54.6 °C/W when mounted on a 1-inch square copper pad on FR-4 board. This value enables reliable power dissipation during short-duration surges and informs PCB layout decisions such as copper area and via count for thermal relief in high-reliability designs.
How does the 1.5SMC43AT3 differ from the 1.5SMC43A part number?
The 1.5SMC43AT3 is supplied on 13-inch tape-and-reel (2500 pcs/reel) and marked as Pb-free, whereas the 1.5SMC43A is offered in bulk packaging without RoHS assurance. Both share identical electrical characteristics and SMC package dimensions, but only the 1.5SMC43AT3 meets modern production requirements for automated assembly and environmental compliance.
1.5SMC43AT3 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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- 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
1.5SMC43AT3 FAQ
1.How can I place an order for 1.5SMC43AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC43AT3 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 1.5SMC43AT3 reliable?
The price and inventory of 1.5SMC43AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC43AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC43AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC43AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC43AT3?
1.5SMC43AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC43AT3 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 1.5SMC43AT3?
For technical support, including 1.5SMC43AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC43AT3 requirements.
6.How does Aetrix verify that 1.5SMC43AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC43AT3 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 1.5SMC43AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC43AT3?
All 1.5SMC43AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC43AT3, 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 1.5SMC43AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC43AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC43AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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