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onsemi 1SMC64AT3
- Part No.:
- 1SMC64AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC64AT3.pdf
- Description:
- TVS DIODE 64VWM 103VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,164
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Product details
Overview
1SMC64AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a 64 V working peak reverse voltage (VRWM), 73.7 V minimum breakdown voltage (VBR) at 1 A test current, 103 V maximum clamping voltage (VC) at 14.6 A peak pulse current, and sub-1 ns response time. It is widely deployed in industrial power supplies and automotive control modules.
For engineers reviewing the 1SMC64AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current handling under IEC 61000-4-5 surge waveforms, UL 497B certification for isolated loop protection, and thermal derating above 75°C ambient.
Technical Context
The 1SMC64AT3 operates as a unidirectional Zener-clamp TVS diode with avalanche breakdown behavior, optimized for fast transient suppression without forward conduction during normal operation. Its junction-to-lead thermal resistance (RJL) is 18.3 °C/W, enabling high-power pulse dissipation when mounted on copper pads per Case 403 footprint guidelines.
It complies with UL 497B for isolated loop circuit protection and meets Class 3 ESD immunity (>16 kV HBM). The device exhibits low zener impedance and negligible inductance, minimizing voltage overshoot during transient events - critical for protecting CAN transceivers and microcontroller I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms, supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing |
| Working Peak Reverse Voltage (VRWM) | 64 V, sets maximum continuous DC or peak AC operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 73.7 V min @ 1 A, defines guaranteed avalanche onset threshold under standardized test conditions |
| Clamping Voltage (VC) | 103 V max @ 14.6 A IPP, determines worst-case voltage seen by downstream circuitry during surge |
| Leakage Current (IR) | <5 µA @ 64 V, ensures minimal standby power loss and signal integrity in high-impedance nodes |
| Response Time | <1 ns typical, enables effective suppression of fast-rising ESD and switching transients |
| ESD Rating | Class 3 (>16 kV) per Human Body Model, qualifies for robust board-level ESD immunity design |
Pinout & Package
1SMC64AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a cathode-indicated molded notch and modified L-bend leads for enhanced solder joint reliability. The package is void-free, thermosetting plastic with Pb-free plating and RoHS compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path during clamping | Connected to system ground or low-impedance reference plane; must minimize trace inductance |
| Cathode | Protected line connection point | Connected directly to the line being protected (e.g., CAN_H, RS-485 A, 24 V rail); polarity-sensitive installation |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop protector category - validated for strike voltage, endurance, dielectric withstand, and discharge performance |
| Low Clamping Ratio (VC/VBR) | 103 V / 73.7 V ≈ 1.40, ensuring tight voltage margin over breakdown and reducing stress on downstream ICs |
| Thermal Derating Support | Rated for 4.0 W DC power at 75°C lead temperature, with 18.3 °C/W RJL enabling predictable thermal management on PCB |
| Pb-Free & RoHS Compliant | G-suffix denotes lead-free Surmetic package compatible with standard reflow profiles up to 260°C for 10 s |
| High Surge Robustness | Withstands 200 A non-repetitive forward surge (8.3 ms half-sine), suitable for motor drive and relay coil suppression |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O Protection |
|---|---|
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 clamping TVS placed between +24 V rail and chassis ground to limit transient overvoltage. Use Value: 103 V clamping voltage ensures MOSFET gate drivers and DC-DC controllers remain below absolute maximum ratings during 100 V/10 ms load dump events. |
Use Scenario: LIN bus transceiver I/O pins in door module subjected to ESD and battery disconnect transients. IC Role / Device Role / Timing Role: Point-of-entry TVS on LIN data line (LIN_BUS) referenced to local ground. Use Value: Sub-1 ns response and <5 µA leakage preserve signal integrity and meet ISO 10605 ESD immunity requirements without loading the LIN driver. |
| Medical Equipment Isolated Sensor Interface | Telecom Line Card Surge Protection |
Use Scenario: 5 V analog sensor supply rail in patient-monitoring device with reinforced isolation barrier. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated 5 V rail protecting ADC reference and op-amp inputs. Use Value: UL 497B recognition validates suitability for protected circuits in medical applications requiring certified isolation integrity. |
Use Scenario: T1/E1 line interface card in central office equipment facing lightning-induced surges on twisted-pair feeds. IC Role / Device Role / Timing Role: Primary-stage unidirectional TVS on tip/ring lines before transformer coupling and line driver ICs. Use Value: 1500 W peak power rating handles 10/700 µs telecom surge waveforms per ITU-T K.21, limiting voltage to <103 V at 14.6 A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | Lower peak power (600 W), same VRWM (64 V), higher VC (104 V), SMB package (smaller footprint) | Limited to lower-energy transients (IEC 61000-4-2 ESD only; not suitable for IEC 61000-4-5 surge) | Select when board space is constrained and surge energy is limited to <600 W; verify thermal margin with RJA = 165 °C/W |
| 1.5SMC64A | Same 1500 W rating and VRWM, but legacy marking (no G-suffix), identical SMC package and electrical specs | No functional difference; lacks explicit Pb-free designation and UL 497B documentation in latest datasheets | Acceptable for cost-sensitive industrial designs where RoHS and UL certification are not mandated |
Compared with 1SMC64AT3, SMBJ64A offers smaller size but reduced surge capability, while 1.5SMC64A matches performance but lacks updated compliance documentation - making 1SMC64AT3 preferred for new designs requiring certified, lead-free, high-reliability TVS protection.
Availability
1SMC64AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, medical sensor interfaces, and telecom line cards requiring stable component supply and certified surge protection.
Supply support for 1SMC64AT3 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 communications markets.
The 1SMC64AT3 belongs to the SMC-series Zener TVS family, engineered for high-energy transient suppression in harsh environments - emphasizing clamping precision, UL-certified reliability, and robust surge survivability in mission-critical systems.
FAQ
What is the clamping voltage of the 1SMC64AT3 at its rated peak pulse current?
The 1SMC64AT3 has a maximum clamping voltage (VC) of 103 V at its specified peak pulse current (IPP) of 14.6 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is critical for ensuring downstream components remain within their absolute maximum voltage ratings. The 1SMC64AT3 achieves this clamping performance while maintaining low dynamic impedance and sub-1 ns response.
Is the 1SMC64AT3 suitable for bidirectional transient protection?
No, the 1SMC64AT3 is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics - including breakdown voltage, clamping behavior, and leakage - are specified only for reverse-biased (cathode-positive) conditions. For AC or dual-polarity signal lines such as RS-485 or USB D+/D−, a dedicated bidirectional part like SMBJ64CA must be used instead. The 1SMC64AT3 datasheet explicitly states that bidirectional devices are not available in this series.
Does the 1SMC64AT3 have UL 497B certification, and what does it cover?
Yes, the entire 1SMC5.0AT3 series - including the 1SMC64AT3 - holds UL 497B recognition under file E210057 for protectors in the "isolated loop circuit protection" category. This certification covers validation of strike voltage breakdown, endurance conditioning, temperature stability, dielectric voltage-withstand, and discharge performance - going beyond basic flammability testing. It confirms suitability for safety-critical isolation barriers in industrial and medical equipment where certified transient suppression is required.
What is the thermal resistance and derating behavior of the 1SMC64AT3?
The 1SMC64AT3 has a junction-to-lead thermal resistance (RJL) of 18.3 °C/W and a junction-to-ambient resistance (RJA) of 165 °C/W. Its DC power dissipation is rated at 4.0 W at 75°C lead temperature, with linear derating above that point (18.3 mW/°C). For reliable long-term operation, PCB layout must follow ON Semiconductor's recommended Case 403 footprint - a 1 in² copper pad on FR-4 - to achieve the specified RJL and avoid thermal runaway during repetitive surge events.
How does the 1SMC64AT3 compare to the 1SMC60AT3 in terms of voltage ratings and application fit?
The 1SMC64AT3 has a 64 V working peak reverse voltage (VRWM) and 73.7 V minimum breakdown voltage (VBR), whereas the 1SMC60AT3 specifies 60 V VRWM and 66.7 V VBR. This 4 V higher VRWM makes the 1SMC64AT3 better suited for 60–64 V nominal systems (e.g., 24 V automotive with load dump margin), providing tighter clamping headroom without premature conduction. Both share identical 1500 W rating, SMC package, and UL 497B certification - so the choice depends strictly on system operating voltage alignment.
1SMC64AT3 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- 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
1SMC64AT3 FAQ
1.How can I place an order for 1SMC64AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC64AT3 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 1SMC64AT3 reliable?
The price and inventory of 1SMC64AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC64AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC64AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC64AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC64AT3?
1SMC64AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC64AT3 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 1SMC64AT3?
For technical support, including 1SMC64AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC64AT3 requirements.
6.How does Aetrix verify that 1SMC64AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC64AT3 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 1SMC64AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC64AT3?
All 1SMC64AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC64AT3, 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 1SMC64AT3 part is unused and in its original packaging.
Return procedure for 1SMC64AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC64AT3 Tags
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