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onsemi 1SMB64CAT3
- Part No.:
- 1SMB64CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB64CAT3.pdf
- Description:
- TVS DIODE 64VWM 103VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,595
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Product details
Overview
1SMB64CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 64 V working peak reverse voltage (VRWM), 78.58 V minimum breakdown voltage (VBR) at 1 mA, and clamps to ≤103 V at 5.8 A peak pulse current - enabling robust surge suppression in power supply rails and interface lines.
For engineers reviewing the 1SMB64CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC bus voltage, clamping voltage margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop protection, and sub-1 ns response time for fast transients.
Technical Context
The 1SMB64CAT3 operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown in both polarities to clamp positive and negative transients symmetrically. Its low zener impedance and fast <1 ns response ensure minimal overshoot when placed close to protected circuitry.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal derating above 75°C (lead temperature) and 25°C (ambient). The device meets UL 497B for isolated loop circuit protection and Class 3 ESD (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 64 V - must be ≥ continuous operating voltage of protected line to avoid leakage conduction during normal operation |
| Breakdown Voltage (VBR) @ IT = 1 mA | 78.58 V min - defines onset of avalanche clamping; ensures reliable turn-on before downstream component damage thresholds |
| Clamping Voltage (VC) @ IPP = 5.8 A | 103 V max - maximum voltage seen by protected load during 600 W transient; determines required IC voltage margin |
| Peak Pulse Power (PPK) | 600 W @ 1 ms - specifies single-event surge energy handling per IEC 61000-4-5 10/1000 µs waveform |
| Leakage Current @ VRWM | <5 µA - negligible standby power loss and signal integrity impact in high-impedance circuits |
| Response Time | <1 ns - enables effective suppression of nanosecond-scale ESD and lightning-induced spikes |
| ESD Rating (HBM) | Class 3 (>16 kV) - exceeds IEC 61000-4-2 Level 4 for system-level ESD immunity |
Pinout & Package
1SMB64CAT3 is housed in an SMB (DO-214AA) surface-mount package (Case 403A), featuring a void-free thermosetting plastic body, corrosion-resistant finish, and modified L-bend leads for enhanced solder pad contact area. Polarity is not marked; the device is symmetrical and bidirectional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity; no orientation required in PCB layout |
| Case / Body | Non-electrical mechanical structure | Thermally conductive path to PCB copper; no electrical connection - safe to mount over ground or power planes |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGV2) | Validated for isolated loop circuit protection - supports compliance in telecom, industrial control, and medical isolation barriers |
| Surmetic® Package Reliability | Void-free transfer-molded construction with 260°C/10s solderability - ensures long-term mechanical stability and assembly yield |
| Low Clamping Ratio (VC/VBR) | 103 V / 78.58 V ≈ 1.31 - tight voltage control minimizes stress on downstream components during surge events |
| High Surge Current Capability | 5.8 A peak pulse current - delivers robust protection against IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) surges |
| Wide Operating Temperature Range | –65°C to +150°C - suitable for under-hood automotive, industrial motor drives, and outdoor power equipment |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional shunt clamping device placed across input terminals, responding within <1 ns to limit voltage excursion. Use Value: Prevents latch-up or permanent damage to DC-DC controllers and microcontrollers by clamping to ≤103 V during 600 W surges. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against battery reverse connection and jump-start transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on LIN data line and VBAT supply, absorbing ±100 V/500 ms pulses without degradation. Use Value: Maintains communication integrity and avoids system reset by limiting voltage to <103 V while sustaining UL 497B isolation compliance. |
| Medical Isolated Sensor Interface | Telecom DSL Line Card Protection |
Use Scenario: Protecting analog front-end inputs of isolated patient monitoring sensors connected via reinforced insulation barriers. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated signal path, certified to UL 497B for protector-class isolation barrier integrity. Use Value: Ensures continued safety compliance after surge exposure by maintaining dielectric strength and preventing tracking across creepage/clearance gaps. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers against lightning-induced common-mode surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-to-ground on line interface, clamping mode-switched transients without affecting signal bandwidth. Use Value: Enables >10 kV lightning surge immunity (IEC 61000-4-5) while preserving signal integrity up to 30 MHz due to low capacitance and fast response. |
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 | Unidirectional; same VRWM (64 V), but only clamps positive transients - requires external polarity management | Limited to DC-biased lines where reverse polarity transients are absent or blocked | Select only if system topology guarantees unidirectional surge exposure and polarity alignment is controlled |
| 1.5SMC64CA | Same bidirectional function and VRWM, but higher 1500 W PPK rating in larger SMC package (DO-214AB) | Requires more PCB area and has higher thermal mass - suited for higher-energy, lower-frequency surges | Choose when surge energy exceeds 600 W or board space allows larger footprint and thermal design accommodates SMC |
Compared with SMBJ64A and 1.5SMC64CA, the 1SMB64CAT3 offers optimal balance of compact SMB footprint, bidirectional symmetry, UL 497B certification, and 600 W surge capability - making it ideal for space-constrained, safety-critical, and polarity-agnostic protection points.
Availability
1SMB64CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical sensor interfaces, and telecom line cards requiring stable component supply and full regulatory traceability.
Supply support for 1SMB64CAT3 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1SMB64CAT3 belongs to the SMB-series transient voltage suppressor family, engineered specifically for high-reliability, surface-mount overvoltage protection in safety-critical and high-surge environments - emphasizing UL recognition, low clamping ratio, and robust thermal performance.
FAQ
What is the clamping voltage of the 1SMB64CAT3 at its rated peak pulse current?
The 1SMB64CAT3 clamps to a maximum of 103 V at its rated peak pulse current of 5.8 A (10/1000 µs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during a 600 W transient event. Designers must verify that this clamping voltage remains below the absolute maximum ratings of downstream ICs.
Is the 1SMB64CAT3 unidirectional or bidirectional, and how does that affect PCB layout?
The 1SMB64CAT3 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. As a result, no orientation marking exists on the device, and PCB layout requires no anode/cathode alignment - either terminal may connect to either side of the protected line. This simplifies placement and eliminates orientation errors during automated assembly.
Does the 1SMB64CAT3 meet UL 497B, and what does that certification cover?
Yes, the 1SMB64CAT3 carries UL 497B recognition (File #116110, Category QVGV2) for protectors used in isolated loop circuits. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - confirming suitability for safety-critical isolation barriers in medical, industrial, and telecom applications where galvanic separation must remain intact after surge exposure.
What is the maximum operating temperature range for the 1SMB64CAT3?
The 1SMB64CAT3 is rated for an operating and storage temperature range of –65°C to +150°C. This wide range supports deployment in harsh environments including automotive engine compartments, industrial motor drives, and outdoor power conversion systems. Thermal derating begins above 75°C (lead temperature) and 25°C (ambient), as defined in the datasheet's derating curves.
How does the 1SMB64CAT3 compare to the 1SMB60CAT3 in terms of voltage ratings and surge capability?
The 1SMB64CAT3 has a 64 V working peak reverse voltage (VRWM) and 78.58 V minimum breakdown voltage (VBR), whereas the 1SMB60CAT3 specifies 60 V VRWM and 73.72 V VBR. Both share identical 600 W peak power rating, 103 V vs. 96.8 V clamping voltage, and 5.8 A vs. 6.2 A IPP - making them functionally interchangeable where system voltage tolerances allow a 4 V VRWM difference and clamping margin permits the 6.2 V higher VC.
1SMB64CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
1SMB64CAT3 FAQ
1.How can I place an order for 1SMB64CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB64CAT3 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 1SMB64CAT3 reliable?
The price and inventory of 1SMB64CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB64CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB64CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB64CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB64CAT3?
1SMB64CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB64CAT3 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 1SMB64CAT3?
For technical support, including 1SMB64CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB64CAT3 requirements.
6.How does Aetrix verify that 1SMB64CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB64CAT3 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 1SMB64CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB64CAT3?
All 1SMB64CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB64CAT3, 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 1SMB64CAT3 part is unused and in its original packaging.
Return procedure for 1SMB64CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB64CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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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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Toshiba Semiconductor and Storage
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Diodes Incorporated
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