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onsemi 1SMB64CAT3G
- Part No.:
- 1SMB64CAT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB64CAT3G.pdf
- Description:
- TVS DIODE 64VWM 103VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:23,451
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Product details
Overview
1SMB64CAT3G from ON Semiconductor is a bidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, with 64 V working peak reverse voltage (VRWM), 78.58 V nominal breakdown voltage (VBR) at 1 mA test current, and 103 V clamping voltage (VC) at 5.8 A peak pulse current. It protects communication interfaces and power rails against ESD and lightning surges.
For engineers reviewing the 1SMB64CAT3G datasheet, pinout, applications, or equivalent options, this TVS diode delivers sub-1 ns response time, UL 497B certification for isolated loop protection, Class 3 HBM ESD rating (>16 kV), and low leakage (<5 µA above 10 V) - critical for robust industrial and automotive interface protection.
Technical Context
This device operates as a voltage-clamped parallel protector, leveraging avalanche breakdown to shunt transients away from sensitive circuitry. Its bidirectional structure enables symmetric suppression of both positive and negative polarity surges without polarity marking.
Designed for non-repetitive 1 ms pulses, it sustains 600 W peak power at 25 °C ambient, with thermal derating to 0.55 W DC at TA = 25 °C and junction-to-ambient thermal resistance of 226 °C/W on FR-4 board using ON Semi's recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64 V - maximum continuous reverse operating voltage before clamping begins; must be ≥ system DC/peak voltage |
| VBR (min/typ/max) | 73.72 / 78.58 / 83.3 V @ 1 mA - defines precise avalanche onset threshold for reliable overvoltage triggering |
| VC @ IPP | 103 V @ 5.8 A - clamped voltage during surge; determines maximum stress imposed on protected ICs |
| PPK | 600 W @ 1 ms - peak energy-handling capability for lightning/ESD transients per IEC 61000-4-5 |
| Capacitance | 145 pF @ 0 V, 1 MHz - low enough for <100 Mbps data lines but requires layout mitigation above 10 Mbps |
| Leakage | <5 µA @ VRWM - negligible standby current impact on low-power sensor or battery-backed circuits |
| Response Time | <1 ns - ensures clamping activation before most semiconductor damage thresholds are exceeded |
Pinout & Package
Package: SMB (Case 403C), surface-mount, Pb-free, void-free thermosetting plastic housing with modified L-bend leads. Mounting position: any. Polarity band not indicated (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode | Transient conduction path | Bidirectional terminals - either lead serves as anode or cathode depending on transient polarity; no marking required |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation and heat dissipation via PCB copper area; no internal thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - meets strike voltage, endurance, dielectric withstand, and discharge requirements for telecom and industrial safety compliance |
| AEC-Q101 Qualified (SZ variant) | Validated for automotive underhood environments - supports use in engine control, infotainment, and ADAS power rail protection |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4, enabling direct port protection without upstream series impedance |
| Low Clamping Ratio | VC/VBR ≈ 1.31 - tight voltage margin between breakdown and clamping improves system-level surge margin vs. competitors |
| SURMETIC® Package | ON Semiconductor's proprietary molding process - delivers high reliability, solderability, and moisture resistance per J-STD-020 |
Applications
| Industrial Power Supply Protection | Automotive CAN Bus Interface |
|---|---|
Use Scenario: 24 V DC input stage of PLC power module exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Parallel-connected transient clamp across input rail, activated within <1 ns to limit voltage to ≤103 V during 5.8 A surge. Use Value: Prevents MOSFET gate oxide rupture and controller latch-up by holding rail voltage below 110 V during 100 ms load dump events. | Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in vehicle body control module. IC Role / Device Role / Timing Role: Dual-diode configuration (one per line) suppressing ±15 kV ESD and ±50 V transients while preserving signal integrity. Use Value: Maintains CAN FD bit rate up to 5 Mbps by limiting capacitance to 145 pF per line and avoiding false dominant state errors. |
| Medical Equipment Isolated Data Links | Telecom DSL Line Interface |
Use Scenario: Protection of opto-isolated UART signals between patient monitor and external diagnostic host. IC Role / Device Role / Timing Role: UL 497B-certified clamp on secondary-side data lines, ensuring creepage/clearance compliance for patient-connected devices. Use Value: Enables Class I medical certification by meeting reinforced insulation requirements for transient immunity without compromising galvanic isolation. | Use Scenario: Overvoltage protection on ADSL/VDSL line drivers connected to outside plant wiring. IC Role / Device Role / Timing Role: Primary surge limiter on twisted-pair interface, absorbing lightning-induced common-mode surges up to 600 W. Use Value: Survives repeated 10/700 µs telecom surges per ITU-T K.21, extending modem field lifetime in lightning-prone regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | 400 W PPK, SMA package, 100 V VC @ 4.3 A, 115 pF capacitance | Lower surge rating and higher clamping voltage reduce margin for 24 V systems with high-energy transients | Select when cost sensitivity outweighs need for 600 W headroom or UL 497B certification |
| SMCJ64A | 1500 W PPK, SMC package, 103 V VC @ 14.5 A, 200 pF capacitance | Larger footprint and higher capacitance limit use in high-speed data lines but improve lightning resilience | Select for primary-level AC/DC front-end protection where PCB space allows and speed is secondary |
Compared with SMAJ64A and SMCJ64A, the 1SMB64CAT3G offers optimal balance of surge rating (600 W), compact SMB footprint, UL 497B compliance, and 145 pF capacitance - making it ideal for space-constrained, safety-critical secondary-side protection in industrial and automotive electronics.
Availability
1SMB64CAT3G is available at Aetrix Electronics and suitable for industrial power supplies, automotive CAN interfaces, medical isolated data links, and telecom DSL line protection requiring stable component supply and long-term lifecycle support.
Supply support for 1SMB64CAT3G 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMB64CAT3G belongs to ON Semiconductor's SMB-series Zener TVS family, engineered for high-reliability transient suppression in harsh environments - particularly where UL recognition, fast response, and bidirectional clamping are mandatory.
FAQ
What is the clamping voltage of the 1SMB64CAT3G at its rated peak pulse current?
The 1SMB64CAT3G has a maximum clamping voltage (VC) of 103 V at 5.8 A peak pulse current (IPP), measured per the 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1SMB64CAT3G suitable for automotive applications?
Yes - the SZ1SMB64CAT3G variant is AEC-Q101 qualified and PPAP capable, supporting automotive underhood and chassis applications. While the standard 1SMB64CAT3G shares identical electrical specs, only the SZ-prefix version is certified for automotive use; design-in for automotive systems requires verification of the SZ part number and associated PPAP documentation.
Does the 1SMB64CAT3G have polarity marking on the package?
No - the 1SMB64CAT3G is a bidirectional TVS diode and carries no polarity band or marking. Its symmetrical Zener structure allows either terminal to serve as anode or cathode depending on transient polarity, simplifying PCB layout and eliminating orientation constraints during automated assembly.
What is the thermal resistance of the 1SMB64CAT3G and how does it affect PCB layout?
The 1SMB64CAT3G has a junction-to-ambient thermal resistance (RJA) of 226 °C/W on FR-4 board using ON Semiconductor's minimum recommended footprint. To maintain reliability during repetitive surges, designers must provide adequate copper pour area (≥1 in²) and avoid thermal bottlenecks - insufficient copper increases junction temperature and reduces surge endurance.
How does UL 497B recognition benefit designs using the 1SMB64CAT3G?
UL 497B recognition confirms the 1SMB64CAT3G meets rigorous safety requirements for protectors in telecommunications and industrial isolated circuits - including strike voltage breakdown, endurance conditioning, and dielectric withstand tests. This certification eliminates need for additional external safety components and accelerates end-product safety approvals in regulated markets.
1SMB64CAT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 145pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB64CAT3G FAQ
1.How can I place an order for 1SMB64CAT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB64CAT3G 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 1SMB64CAT3G reliable?
The price and inventory of 1SMB64CAT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB64CAT3G is usually 5 days.
3.What payment methods are accepted for 1SMB64CAT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB64CAT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB64CAT3G?
1SMB64CAT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB64CAT3G 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 1SMB64CAT3G?
For technical support, including 1SMB64CAT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB64CAT3G requirements.
6.How does Aetrix verify that 1SMB64CAT3G is sourced from the original manufacturer or authorized distributors?
All 1SMB64CAT3G 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 1SMB64CAT3G meets industry standards.
7.What is the process for return or replacement of 1SMB64CAT3G?
All 1SMB64CAT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB64CAT3G, 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 1SMB64CAT3G part is unused and in its original packaging.
Return procedure for 1SMB64CAT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB64CAT3G Tags
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