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onsemi 1SMB64AT3G
- Part No.:
- 1SMB64AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB64AT3G.pdf
- Description:
- TVS DIODE 64VWM 103VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:50,500
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Product details
Overview
1SMB64AT3G from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) in SMB package, designed for parallel clamping protection of 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 5.8 A peak pulse current (IPP), and sub-1 ns response time - deployed in automotive power supplies, industrial I/O interfaces, and telecom surge protection circuits.
For engineers reviewing the 1SMB64AT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, real-world clamping behavior, UL 497B certification status, thermal derating guidance, and validated alternative parts for ESD/surge hardening designs requiring robust overvoltage immunity.
Technical Context
The 1SMB64AT3G operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its VRWM of 64 V. Its low zener impedance and fast <1.0 ns response enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges per IEC 61000-4-2/5.
It is rated for 600 W peak pulse power (10/1000 µs waveform), with thermal resistance of 226 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead), supporting operation from −65 °C to +150 °C. The device meets UL 497B for isolated loop circuit protection and is AEC-Q101 qualified when ordered as SZ1SMB64AT3G.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system bus voltage compatibility. |
| VBR (min) | 71.1 V @ 1 mA - Guaranteed avalanche initiation threshold; ensures predictable turn-on margin above VRWM. |
| VC (max) | 103 V @ IPP = 5.8 A - Maximum clamped voltage during 10/1000 µs surge; defines worst-case stress on protected ICs. |
| PPK | 600 W @ 1 ms - Peak transient energy absorption capacity; validates suitability for Level 4 IEC 61000-4-5 surges. |
| IR (max) | 5.0 µA @ 64 V - Reverse leakage at VRWM; negligible power loss in standby, critical for low-power sensor nodes. |
| Response Time | <1.0 ns - Time from transient onset to clamping action; essential for protecting high-speed logic and ADC inputs. |
| UL Recognition | UL 497B QVGQ2 - Certified for use in telecom and industrial isolated loop protectors; exceeds basic flammability requirements. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, Pb-free, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Mounting position: any.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward conduction; connected to ground or low-side reference in unidirectional clamp configuration. | Provides return path for surge current; must be routed with minimal inductance to avoid overshoot. |
| Cathode | High-impedance input during normal operation; clamps to VC when transient exceeds VRWM. | Connected to protected line (e.g., 48 V rail or RS-485 bus); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse rating | Supports IEC 61000-4-5 Level 4 (4 kV line-to-ground) surge testing without degradation. |
| UL 497B recognition | Validated for telecom loop protector applications; eliminates need for additional safety certification in end equipment. |
| AEC-Q101 qualification (SZ variant) | Enables drop-in use in automotive body control modules and infotainment power supplies meeting automotive reliability standards. |
| ESD HBM Class 3 (>16 kV) | Protects downstream ASICs and microcontrollers from human-body model discharges without external series resistance. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected devices compared to higher-ratio TVS diodes. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: 24 V DC input terminals on programmable logic controller modules exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed directly across input terminals to limit voltage to ≤103 V during 600 W surges. Use Value: Prevents damage to upstream DC-DC converters and downstream isolation amplifiers by maintaining safe voltage margin below their absolute maximum ratings. |
Use Scenario: 12 V battery-supplied power input to BCM microcontroller and CAN transceiver subsystems. IC Role / Device Role / Timing Role: Primary overvoltage clamp against ISO 7637-2 Pulse 1 (−150 V) and Pulse 5a (load dump up to +60 V). Use Value: Ensures continuous operation during 12 V system transients without brownout or latch-up, meeting OEM EMC requirements. |
| Telecom Isolated Loop Interface | Medical Equipment Power Entry |
Use Scenario: 48 V phantom-powered analog loop interfaces in VoIP gateways and remote telemetry units. IC Role / Device Role / Timing Role: UL 497B-certified TVS on line side of isolation barrier to absorb induced surges before reaching transformer or optocoupler. Use Value: Maintains safety isolation integrity while meeting UL 60950-1 and IEC 60601-1 surge immunity requirements for telecom infrastructure. |
Use Scenario: AC/DC adapter input stage in Class II medical devices (e.g., patient monitors) requiring reinforced insulation. IC Role / Device Role / Timing Role: Secondary-level TVS on DC output rail to suppress conducted transients coupled through power supply filtering. Use Value: Complies with IEC 60601-1 3rd edition Clause 8.8.3.2 for applied part transient immunity without compromising creepage/clearance distances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMB64AT3G | AEC-Q101 qualified; identical electrical specs but with automotive-grade traceability, PPAP documentation, and extended temperature screening. | Required for automotive OEM designs; not necessary for industrial or consumer applications. | Select SZ1SMB64AT3G only when automotive qualification and change control are mandated by program requirements. |
| SMCJ64A | Higher 1500 W peak power rating; larger SMC package (7.11 × 6.22 mm vs. SMB's 4.6 × 3.95 mm); same VRWM and VC. | Better suited for high-energy surges where board space allows; incompatible with SMB footprint. | Choose SMCJ64A when surge threat level exceeds 600 W or when thermal dissipation demands larger package area. |
Compared with 1SMB64AT3G, SZ1SMB64AT3G adds automotive process controls without altering electrical performance, while SMCJ64A trades compact size for higher surge capacity - making the original optimal for space-constrained 600 W protection in industrial and telecom systems.
Availability
1SMB64AT3G is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, and telecom infrastructure requiring stable component supply, RoHS-compliant packaging, and UL-recognized surge protection.
Supply support for 1SMB64AT3G 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 onsemi) is a global semiconductor supplier specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The SMB-series TVS diodes, including 1SMB64AT3G, were engineered for cost-effective, high-reliability transient suppression in space-constrained PCB layouts - targeting communication systems, automotive ECUs, and medical power supplies needing certified overvoltage immunity.
FAQ
What is the maximum clamping voltage of the 1SMB64AT3G under standard surge conditions?
The 1SMB64AT3G has a maximum clamping voltage (VC) of 103 V when subjected to its rated peak pulse current (IPP) of 5.8 A using the 10/1000 µs waveform. This value is guaranteed across temperature and represents the highest voltage seen by downstream components during a worst-case transient - critical for verifying margin against IC absolute maximum ratings in designs using the 1SMB64AT3G.
Is the 1SMB64AT3G RoHS-compliant and lead-free?
Yes, the 1SMB64AT3G is a Pb-free device manufactured in ON Semiconductor's SURMETIC™ package, compliant with RoHS Directive 2011/65/EU. The "G" suffix explicitly denotes lead-free construction, and the datasheet confirms compatibility with standard reflow profiles up to 260 °C for 10 seconds - making the 1SMB64AT3G suitable for modern eco-conscious manufacturing without solderability compromise.
Does the 1SMB64AT3G meet automotive qualification standards?
The standard 1SMB64AT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZ1SMB64AT3G is fully AEC-Q101 qualified and PPAP-capable. Both share identical electrical specifications and SMB package dimensions, but only SZ1SMB64AT3G undergoes automotive-specific screening, traceability, and change control - so designers must specify SZ1SMB64AT3G explicitly when automotive compliance is required for the 1SMB64AT3G family.
How does the 1SMB64AT3G compare to bidirectional TVS diodes in surge protection?
The 1SMB64AT3G is unidirectional and optimized for DC-biased lines like power rails, where reverse voltage is blocked and only positive transients require clamping. Bidirectional variants (e.g., 1SMB64CAT3G) handle AC signals or floating buses but exhibit higher leakage and reduced VRWM margin. For 12/24/48 V DC systems, the 1SMB64AT3G provides tighter clamping and lower leakage than bidirectional equivalents - making it the preferred choice where polarity is fixed and efficiency matters.
What is the thermal resistance and derating behavior of the 1SMB64AT3G?
The 1SMB64AT3G has a junction-to-ambient thermal resistance (RJA) of 226 °C/W on FR-4 board with ON Semiconductor's recommended footprint. Its DC power dissipation derates linearly above 25 °C at 4.4 mW/°C, dropping to 0.55 W at 25 °C ambient. For pulsed operation, Figure 3 in the datasheet shows peak power derating above 75 °C - essential for ensuring long-term reliability of the 1SMB64AT3G in enclosed, high-temperature enclosures.
1SMB64AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- 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):
- 5.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 280pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB64AT3G FAQ
1.How can I place an order for 1SMB64AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB64AT3G 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 1SMB64AT3G reliable?
The price and inventory of 1SMB64AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB64AT3G is usually 5 days.
3.What payment methods are accepted for 1SMB64AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB64AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB64AT3G?
1SMB64AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB64AT3G 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 1SMB64AT3G?
For technical support, including 1SMB64AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB64AT3G requirements.
6.How does Aetrix verify that 1SMB64AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMB64AT3G 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 1SMB64AT3G meets industry standards.
7.What is the process for return or replacement of 1SMB64AT3G?
All 1SMB64AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB64AT3G, 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 1SMB64AT3G part is unused and in its original packaging.
Return procedure for 1SMB64AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB64AT3G Tags
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