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onsemi 1SMC64AT3G
- Part No.:
- 1SMC64AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC64AT3G.pdf
- Description:
- TVS DIODE 64V 103V 64LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
1SMC64AT3G from ON Semiconductor is a unidirectional 1500 W peak power TVS diode designed for transient overvoltage protection in DC power rails and signal lines. It features a 64 V working peak reverse voltage (VRWM), 71.1 V minimum breakdown voltage (VBR) at 1 mA, 103 V maximum clamping voltage (VC) at 14.6 A peak pulse current (IPP), and sub-1 ns response time. It is used in industrial power supplies to safeguard rectifier outputs and DC bus lines against ESD and lightning-induced surges.
For engineers reviewing the 1SMC64AT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, package dimensions, real-world clamping behavior, UL 497B certification status, and validated alternative parts for robust surge protection design.
Technical Context
The 1SMC64AT3G operates as a unidirectional Zener-based transient voltage suppressor, leveraging avalanche breakdown to clamp transients above its VRWM of 64 V. Its low zener impedance and fast <1 ns response ensure minimal overshoot during 8.3 ms half-sine surges up to 14.6 A.
It is rated for 1500 W non-repetitive peak power (10/1000 µs waveform), supports 16 kV HBM ESD immunity, and meets UL 497B for isolated loop circuit protection - critical for telecom interface and industrial I/O port hardening.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min @ IT=1 mA) | 71.1 V - Ensures reliable turn-on above normal operating rail; avoids false triggering |
| VC @ IPP | 103 V @ 14.6 A - Clamped voltage seen by protected circuit during worst-case 10/1000 µs surge |
| Peak Power | 1500 W @ 1 ms - Withstands high-energy transients without failure per IEC 61000-4-5 Level 4 |
| Leakage Current | <5 µA @ 64 V - Negligible standby power loss in always-on systems |
| Response Time | <1 ns - Limits voltage overshoot before clamping engages; critical for fast-edge transients |
| ESD Rating | Class 3 (>16 kV HBM) - Meets IEC 61000-4-2 for system-level ESD immunity |
Pinout & Package
1SMC64AT3G uses the SMC (DO-214AB) surface-mount package (Case 403), with cathode indicated by a molded notch on the body. The device has two terminals: anode and cathode, mounted in-line with standard PCB land pattern per ON Semiconductor's recommended footprint (7.75 × 6.10 mm body, 2.92 mm lead width).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference in unidirectional clamp configuration |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., +64 V rail); polarity notch identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for protector category - passes strike voltage, endurance, dielectric withstand, and discharge tests |
| Surmetic™ Package | Void-free thermoset plastic with modified L-bend leads - enables reliable solder joints and 260°C reflow compatibility |
| Low Clamping Ratio | VC/VBR = 103/71.1 ≈ 1.45 - Tighter than typical 1.5–1.7 ratio, reducing stress on downstream ICs |
| High Surge Robustness | Withstands 200 A non-repetitive forward surge (IFSM) - protects against accidental reverse-polarity connection events |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module I/O |
|---|---|
Use Scenario: DC bus line in 48 V industrial SMPS exposed to load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed across output capacitor to clamp transients before they reach downstream regulators and microcontrollers. Use Value: Limits voltage excursion to ≤103 V during 14.6 A surges, preventing latch-up or gate oxide damage in 65 V-rated MOSFETs and controllers. | Use Scenario: LIN bus or sensor supply line in BCM subjected to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Standoff protection device on 12 V sensor rail, absorbing energy while maintaining signal integrity. Use Value: Sub-1 ns response ensures clamping initiates before 50 ns rise-time pulses exceed IC absolute max ratings. |
| Telecom Interface Port Hardening | Medical Equipment AC/DC Input Stage |
Use Scenario: RS-485 transceiver power rail in outdoor base station equipment facing lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC line, coordinated with secondary MOV and gas discharge tube in multi-stage protection network. Use Value: UL 497B recognition validates suitability for isolated loop circuits - required for telecom safety compliance. | Use Scenario: Secondary-side DC output of medical-grade AC/DC adapter powering patient-connected monitoring circuits. IC Role / Device Role / Timing Role: Final-stage transient suppressor on isolated 24 V output, ensuring no hazardous voltage propagates to patient-accessible parts. Use Value: Low leakage (<5 µA) prevents leakage current accumulation across reinforced insulation barriers per IEC 60601-1. |
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 | 600 W peak power; SMB package (smaller footprint); 104 V VC @ 9.6 A | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is ≤Level 3 |
| 1.5SMC64A | Same 1500 W rating and SMC package; slightly higher VC (104 V @ 14.5 A); identical VRWM and VBR | No functional difference in clamping performance or layout; alternate manufacturer marking | Drop-in replacement with identical electrical and mechanical behavior |
Compared with SMBJ64A, 1SMC64AT3G delivers 2.5× higher surge energy handling and superior UL 497B coverage; versus 1.5SMC64A, it offers identical protection specs but differs only in date code and traceability - making it suitable for legacy-design continuity or dual-sourcing strategies.
Availability
1SMC64AT3G is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, telecom infrastructure, and medical power systems requiring stable component supply across long production lifecycles.
Supply support for 1SMC64AT3G 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 supplier specializing in power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMC64AT3G belongs to the SMC-series unidirectional TVS family, engineered specifically for high-energy transient suppression in harsh environments where reliability, UL certification, and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of the 1SMC64AT3G at its rated peak pulse current?
The 1SMC64AT3G has a maximum clamping voltage (VC) of 103 V at its rated peak pulse current (IPP) of 14.6 A, measured under the standard 10/1000 µs waveform. This value defines the highest voltage the protected circuit will experience during a full-rated surge event. Engineers use this parameter to verify that downstream components remain within their absolute maximum voltage ratings when the 1SMC64AT3G is active.
Is the 1SMC64AT3G certified for UL 497B, and what does that mean for system design?
Yes, the 1SMC64AT3G carries UL 497B recognition for protectors (File #116110, QVGV2 category). This certification confirms it passed rigorous tests including strike voltage breakdown, endurance conditioning, temperature cycling, dielectric withstand, and discharge - validating its use in isolated loop circuits like telecom interfaces and medical isolation barriers. For system designers, this eliminates need for additional third-party validation of the 1SMC64AT3G's protective function in safety-critical applications.
Does the 1SMC64AT3G have bidirectional capability?
No, the 1SMC64AT3G is strictly unidirectional. The datasheet explicitly states "Bidirectional devices will not be available in this series," and its electrical characteristics - including VRWM, VBR, and VC - are specified only for reverse-bias operation. Using it in bidirectional configurations (e.g., AC line protection) would result in forward conduction during negative half-cycles and potential failure. For bidirectional needs, separate symmetric TVS arrays or dedicated bidirectional parts like SMAJ64A must be selected.
What is the thermal resistance from junction to ambient (RJA) for the 1SMC64AT3G, and how does it affect derating?
The 1SMC64AT3G has a thermal resistance from junction to ambient (RJA) of 165 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint. This high RJA means power dissipation must be aggressively derated above 25°C ambient: at 75°C, its DC power rating drops from 0.75 W to zero. However, since the device is intended for transient (not continuous) operation, this RJA primarily informs layout decisions - such as copper pour area and proximity to heat sources - rather than steady-state limits.
Can the 1SMC64AT3G be used in automotive applications compliant with ISO 7637-2?
Yes, the 1SMC64AT3G is suitable for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2a (sudden load interruption) protection in automotive body control modules and infotainment power rails. Its 1500 W peak power rating exceeds the energy requirements of these pulses, and its 103 V clamping voltage aligns with 12 V system survivability thresholds. Designers must pair it with appropriate series impedance (e.g., 1–10 Ω) and verify layout parasitics to ensure sub-1 ns response translates to effective overshoot suppression in vehicle harness environments.
1SMC64AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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
1SMC64AT3G FAQ
1.How can I place an order for 1SMC64AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC64AT3G 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 1SMC64AT3G reliable?
The price and inventory of 1SMC64AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC64AT3G is usually 5 days.
3.What payment methods are accepted for 1SMC64AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC64AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC64AT3G?
1SMC64AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC64AT3G 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 1SMC64AT3G?
For technical support, including 1SMC64AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC64AT3G requirements.
6.How does Aetrix verify that 1SMC64AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMC64AT3G 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 1SMC64AT3G meets industry standards.
7.What is the process for return or replacement of 1SMC64AT3G?
All 1SMC64AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC64AT3G, 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 1SMC64AT3G part is unused and in its original packaging.
Return procedure for 1SMC64AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC64AT3G Tags
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