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onsemi 1.5SMC75AT3
- Part No.:
- 1.5SMC75AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC75AT3.pdf
- Description:
- TVS DIODE 64.1VWM 103VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,191
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Product details
Overview
1.5SMC75AT3 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 64.1 V working peak reverse voltage (VRWM), 75 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps to 103 V at 14.6 A peak pulse current (IPP), making it suitable for protecting industrial power supplies and automotive ECUs against ESD and lightning-induced surges.
For engineers reviewing the 1.5SMC75AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin above operating voltage, clamping voltage vs. protected device's absolute maximum rating, surge current capability under 1 ms pulses, and UL 497B recognition for isolated loop circuit protection.
Technical Context
The 1.5SMC75AT3 operates as a unidirectional Zener-based TVS diode, entering avalanche conduction when reverse voltage exceeds its specified VBR. Its low dynamic impedance and sub-1 ns response time enable rapid clamping of fast transients such as ESD (IEC 61000-4-2) and inductive switching spikes.
It is rated for 1500 W peak pulse power (10/1000 µs waveform), with thermal derating above 75°C junction temperature and a maximum junction-to-lead thermal resistance of 54.6 °C/W. The device meets UL 497B for isolated loop circuit protection and carries Class 3 HBM ESD rating (>16 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms (10/1000 µs waveform); sustains single high-energy surges without failure |
| Working Peak Reverse Voltage (VRWM) | 64.1 V; maximum continuous DC or peak AC voltage the device blocks before clamping |
| Zener Breakdown Voltage (VBR) | 75 V (min 71.3 V, max 78.8 V @ IT = 1 mA); defines precise avalanche turn-on threshold |
| Clamping Voltage (VC) | 103 V @ IPP = 14.6 A; maximum voltage seen by protected circuit during worst-case surge |
| Leakage Current (IR) | < 5 µA @ VRWM = 64.1 V; ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Response Time | < 1 ns; enables suppression of fast-rising transients before downstream ICs experience overstress |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; qualifies for robust board-level ESD immunity design |
Pinout & Package
1.5SMC75AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a molded polarity notch indicating the cathode terminal. The package uses void-free thermosetting plastic, corrosion-resistant finish, and modified L-bend leads for reliable soldering on FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to ground or lower-potential rail in unidirectional protection configuration |
| Cathode | Avalanche conduction node / high-side clamp point | Connected to protected line; conducts surge current to ground when voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - passes strike voltage, endurance, dielectric withstand, and discharge tests |
| Low Clamping Ratio | VC/VBR = 103/75 ≈ 1.37; tight ratio minimizes overvoltage stress on downstream components |
| High Surge Robustness | 14.6 A IPP at 103 V clamping; handles repetitive or single-event surges common in automotive load-dump and industrial motor drive environments |
| Thermal Reliability | RJL = 54.6 °C/W; supports stable operation up to +150°C junction temperature with proper PCB copper area |
| ESD Hardness | >16 kV HBM; eliminates need for additional discrete ESD protection in many I/O and power-input designs |
Applications
| Industrial Power Supply Protection | Automotive ECU Input Protection |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤103 V during 14.6 A surges, ensuring downstream 100 V-rated MOSFETs and regulators remain within safe operating area. |
Use Scenario: Safeguarding CAN transceiver power pins in engine control units exposed to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail, activated within <1 ns to suppress 60 V–100 V, 100 ms transients. Use Value: Maintains rail voltage below 103 V while absorbing 1500 W peak energy, preventing latch-up or burnout of 5 V/3.3 V LDOs and CAN PHYs. |
| Medical Equipment Surge Suppression | Telecom Interface Protection |
Use Scenario: Guarding auxiliary 24 V power inputs in diagnostic imaging systems against ESD and mains-coupled surges. IC Role / Device Role / Timing Role: Standoff TVS on isolated secondary-side power entry, coordinated with upstream fusing and filtering. Use Value: Provides Class 3 ESD immunity (>16 kV HBM) and UL 497B-compliant isolation barrier integrity without adding complexity or leakage. |
Use Scenario: Protecting RS-485 transceiver VCC and bus lines in base station remote radio units subjected to lightning-induced surges. IC Role / Device Role / Timing Role: High-power unidirectional clamp on power rail, paired with bidirectional TVS on differential data lines. Use Value: Clamps 10/1000 µs surges to 103 V at 14.6 A, preserving signal integrity and enabling compliance with IEC 61000-4-5 Level 3 (1 kV/2 kV) |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | 600 W peak power, same VRWM (64.1 V) and VBR (75 V), but lower IPP (12.3 A) and higher VC (121 V) | Lower surge capacity; suitable only for lighter-duty applications where 1500 W is not required | Select when board space is constrained (SMB vs. SMC) and surge energy is limited to ≤600 W |
| 1.5KE75A | Through-hole DO-201 package, identical electrical specs (VRWM = 64.1 V, VBR = 75 V, VC = 103 V, IPP = 14.6 A), but no UL 497B recognition | Lacks UL certification for isolated loop use; requires external validation for safety-critical telecom/medical designs | Choose for legacy through-hole assembly or cost-sensitive non-certified industrial controls |
Compared with SMBJ75A and 1.5KE75A, the 1.5SMC75AT3 delivers full 1500 W surge handling in a surface-mount SMC package with UL 497B listing - critical for certified industrial and medical power interfaces where both energy capacity and regulatory compliance are mandatory.
Availability
1.5SMC75AT3 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive ECU input hardening, and medical equipment surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC75AT3 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 part of onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, cloud, and medical markets.
The 1.5SMC75AT3 belongs to the SMC-series transient voltage suppressors - engineered for high-reliability overvoltage protection in harsh environments, with emphasis on surge robustness, fast response, and safety certification for mission-critical systems.
FAQ
What is the working peak reverse voltage (VRWM) of the 1.5SMC75AT3?
The 1.5SMC75AT3 has a working peak reverse voltage (VRWM) of 64.1 V. This value represents the maximum continuous DC or peak AC voltage the device can block in normal operation without entering avalanche conduction. Engineers must ensure the VRWM exceeds the system's maximum steady-state operating voltage by at least 10–20% to avoid premature clamping during normal operation.
What clamping voltage does the 1.5SMC75AT3 exhibit under peak surge conditions?
The 1.5SMC75AT3 clamps to a maximum of 103 V when subjected to its rated peak pulse current of 14.6 A (10/1000 µs waveform). This clamping voltage is the highest voltage that will appear across the protected circuit during a worst-case transient, and must be verified against the absolute maximum ratings of downstream components such as DC-DC controllers or interface ICs.
Is the 1.5SMC75AT3 certified for safety-critical applications?
Yes, the 1.5SMC75AT3 carries UL 497B recognition (File #116110) for isolated loop circuit protection. It has passed rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge verification - making it suitable for certified telecom, medical, and industrial isolation barriers where regulatory compliance is mandatory.
Does the 1.5SMC75AT3 support high-speed transient suppression?
Yes, the 1.5SMC75AT3 has a typical response time of less than 1 ns, enabling effective suppression of fast-rising transients such as ESD events (IEC 61000-4-2) and switching noise. Its low dynamic impedance and optimized SMC package geometry minimize parasitic inductance, reducing voltage overshoot during turn-on and improving protection fidelity.
What is the maximum junction temperature rating for the 1.5SMC75AT3?
The 1.5SMC75AT3 is rated for an operating and storage temperature range of –65 °C to +150 °C. Its thermal resistance from junction to lead (RJL) is 54.6 °C/W, and derating begins above 75 °C ambient or lead temperature. Proper PCB copper area and layout are essential to maintain junction temperature within limits during repeated surge events.
1.5SMC75AT3 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):
- 64.1V
- Voltage - Breakdown (Min):
- 71.3V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 14.6A
- 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
1.5SMC75AT3 FAQ
1.How can I place an order for 1.5SMC75AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC75AT3 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 1.5SMC75AT3 reliable?
The price and inventory of 1.5SMC75AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC75AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC75AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC75AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC75AT3?
1.5SMC75AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC75AT3 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 1.5SMC75AT3?
For technical support, including 1.5SMC75AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC75AT3 requirements.
6.How does Aetrix verify that 1.5SMC75AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC75AT3 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 1.5SMC75AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC75AT3?
All 1.5SMC75AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC75AT3, 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 1.5SMC75AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC75AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC75AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
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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