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onsemi 1.5SMC68AT3
- Part No.:
- 1.5SMC68AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC68AT3.pdf
- Description:
- TVS DIODE 58.1VWM 92VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,669
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Product details
Overview
1.5SMC68AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 58.1 V working peak reverse voltage (VRWM), 68 V breakdown voltage (VBR) at 1 mA test current, 92 V clamping voltage at 16.3 A peak pulse current, <5 µA leakage above 10 V, and sub-1 ns response time.
For engineers reviewing the 1.5SMC68AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. system operating voltage, clamping voltage headroom relative to protected IC absolute maximum ratings, surge current capability under 1 ms 10/1000 µs waveform, UL 497B recognition for isolated loop protection, and SMC package thermal performance in high-density layouts.
Technical Context
The 1.5SMC68AT3 operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its specified VBR of 68 V (min 64.6 V, max 71.4 V). Its low dynamic impedance and fast junction response enable effective suppression of ESD and lightning-induced transients without latch-up or degradation under single-event stress.
It is rated for 1500 W peak pulse power (10/1000 µs waveform), with thermal derating beginning at 75°C junction temperature and full ambient derating above 25°C. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection - a requirement for industrial and telecom interface ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms 10/1000 µs waveform - sustains single high-energy surges common in automotive load-dump or AC line coupling events |
| Working Peak Reverse Voltage (VRWM) | 58.1 V - maximum continuous reverse voltage before significant leakage; sets minimum system operating margin |
| Breakdown Voltage (VBR) | 68 V @ 1 mA - precise Zener threshold where avalanche conduction begins; tolerance ±5% (64.6–71.4 V) |
| Clamping Voltage (VC) | 92 V @ 16.3 A IPP - maximum voltage seen by protected circuit during full-rated surge; defines safe headroom vs. 75 V IC limits |
| Leakage Current | <5 µA @ 58.1 V - negligible standby power loss and minimal impact on high-impedance bias networks |
| Response Time | <1 ns - ensures clamping activation prior to damage onset in CMOS and precision analog circuits |
| ESD Rating | Class 3 HBM (>16 kV) - exceeds IEC 61000-4-2 Level 4 for board-level ESD robustness |
| UL Recognition | UL 497B (QVGV2) - certified for use in safety-critical isolated loop interfaces including RS-485, CAN, and sensor bridges |
Pinout & Package
Package: SMC (Case 403), surface-mount, void-free thermosetting plastic with modified L-bend leads and molded cathode notch polarity indicator. Dimensions: 6.60–7.11 mm × 5.59–6.10 mm × 2.92–3.07 mm (L×W×H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during reverse-bias clamping | Connected to ground or low-impedance return path; must handle 16.3 A transient without trace fusing |
| Cathode | High-side connection to protected line | Marked by molded notch; ties to rail being protected (e.g., 48 V DC input); determines VRWM alignment |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic™ package reliability | Void-free transfer-molded construction with corrosion-resistant finish and solderable leads - supports automated reflow and long-term field stability |
| Low clamping ratio (VC/VBR) | 92 V / 68 V = 1.35 - tight voltage control minimizes overstress risk for downstream 75 V-rated components |
| Thermal resistance (RJL) | 54.6 °C/W - enables efficient heat transfer to PCB copper pads, critical for repeated surge duty cycles |
| Temperature coefficient of VBR | +0.104 %/°C - predictable VBR drift over –65°C to +150°C operating range supports thermal design margining |
| Lead-free and RoHS compliant | Meets J-STD-609 Category 1 marking and Pb-free reflow profile compatibility - suitable for modern manufacturing |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converter input. Use Value: 92 V clamping voltage provides 13 V margin below typical 105 V load-dump peak, preventing upstream regulator failure while maintaining UL 497B compliance. | Use Scenario: CAN FD data line protection in BCM against battery reversal and jump-start induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1.5SMC68AT3 used on VBAT-referenced supply rail feeding CAN transceiver LDO. Use Value: 58.1 V VRWM aligns with 45 V nominal 48 V system, allowing safe operation during cold-crank (down to ~6 V) while blocking normal-mode noise. |
| Medical Isolated Sensor Interface | Telecom Remote Power Feeding (RPF) |
Use Scenario: 24 V auxiliary rail powering isolated SPI temperature sensor in MRI room equipment. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point to shunt ESD and fast transients before isolation barrier. Use Value: UL 497B recognition validates suitability for patient-connected systems; <1 ns response prevents transient coupling across digital isolators. | Use Scenario: 57 V DC power feed to remote DSLAM unit via twisted-pair cable subject to lightning induction. IC Role / Device Role / Timing Role: Primary overvoltage clamp on PSE-side output, coordinated with secondary-side 1.5KE68A for differential-mode suppression. Use Value: 1500 W rating handles multi-kA induced surges; 92 V VC ensures PoE+ PD ICs (rated to 100 V) remain within safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ68A | 600 W peak power, same VRWM (58.1 V), higher VC (113 V @ 8.2 A), SMB package (smaller footprint, lower thermal mass) | Lower surge capacity; suited for space-constrained consumer electronics with infrequent transients | Select when board area is limited and surge threat level is Class II (IEC 61000-4-5 0.5 kV) |
| 1.5KE68A | Through-hole TO-204AA package, identical electrical specs (VRWM 58.1 V, VBR 68 V, VC 92 V), higher thermal inertia | Requires wave soldering; preferred for high-reliability industrial power supplies with manual assembly or legacy layouts | Select when mechanical robustness, serviceability, or existing through-hole infrastructure dictates package choice |
Compared with SMBJ68A and 1.5KE68A, the 1.5SMC68AT3 delivers optimal balance of surge capacity, surface-mount compatibility, and UL 497B certification - making it the preferred choice for new designs requiring 1500 W clamping in compact, automated production environments.
Availability
1.5SMC68AT3 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, medical isolated sensor interfaces, and telecom remote power feeding requiring stable component supply and full regulatory compliance.
Supply support for 1.5SMC68AT3 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 cloud power applications.
The 1.5SMC68AT3 belongs to the SMC-series transient voltage suppressors - engineered for high-energy surge immunity in harsh environments, with emphasis on UL 497B compliance, low clamping ratio, and robust surface-mount packaging.
FAQ
What is the clamping voltage of the 1.5SMC68AT3 and how is it measured?
The 1.5SMC68AT3 has a maximum clamping voltage (VC) of 92 V, measured at a peak pulse current (IPP) of 16.3 A using a 10/1000 µs waveform. This value represents the highest voltage the device allows across its terminals during a full-rated transient event, ensuring downstream components see no more than 92 V even under worst-case surge conditions. The 1.5SMC68AT3 achieves this with low dynamic impedance and fast avalanche response.
Does the 1.5SMC68AT3 meet UL 497B requirements for isolated loop protection?
Yes, the 1.5SMC68AT3 is UL 497B recognized (File #116110, QVGV2 category) for isolated loop circuit protection. This certification confirms successful completion of Strike Voltage Breakdown, Endurance Conditioning, Temperature, Dielectric Withstand, and Discharge tests - validating its use in safety-critical interfaces such as RS-485, CAN, and isolated sensor bridges where galvanic separation must be maintained during surge events. The 1.5SMC68AT3 carries this rating as part of the full SMC series.
What is the thermal resistance and maximum operating temperature of the 1.5SMC68AT3?
At zero lead length on FR-4 board, the 1.5SMC68AT3 has a junction-to-lead thermal resistance (RJL) of 54.6 °C/W and a junction-to-ambient resistance (RJA) of 165 °C/W. Its operating and storage temperature range is –65°C to +150°C. Derating begins at 75°C for DC power and at 25°C for ambient temperature-dependent average power handling. These values ensure reliable operation in under-hood automotive and industrial control cabinet environments where the 1.5SMC68AT3 is commonly deployed.
How does the 1.5SMC68AT3 differ from bidirectional TVS diodes?
The 1.5SMC68AT3 is unidirectional - it conducts only during reverse-bias overvoltage events and behaves as a high-impedance open circuit under forward bias. Unlike bidirectional TVS diodes (e.g., 1.5SMC68CA), it does not suppress positive transients on grounded lines or AC signals. This makes the 1.5SMC68AT3 ideal for DC rail protection where polarity is fixed and forward conduction must be avoided, such as in 48 V power inputs or microcontroller supply rails. Its unidirectional nature also yields tighter VBR tolerance and lower leakage than equivalent bidirectional parts.
What is the marking code for the 1.5SMC68AT3 on the device body?
The 1.5SMC68AT3 is marked "68A" on its top surface, consistent with ON Semiconductor's standard SMC-series coding. The "68" denotes the nominal breakdown voltage of 68 V, and the "A" indicates the unidirectional configuration. Polarity is indicated by a molded cathode notch on the case body. This marking aligns with the ordering information table on page 3 of the official datasheet and is verified on actual production units supplied in 2500-piece tape-and-reel format (T3 = 13-inch reel).
1.5SMC68AT3 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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 16.3A
- 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
1.5SMC68AT3 FAQ
1.How can I place an order for 1.5SMC68AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC68AT3 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 1.5SMC68AT3 reliable?
The price and inventory of 1.5SMC68AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC68AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC68AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC68AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC68AT3?
1.5SMC68AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC68AT3 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 1.5SMC68AT3?
For technical support, including 1.5SMC68AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC68AT3 requirements.
6.How does Aetrix verify that 1.5SMC68AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC68AT3 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 1.5SMC68AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC68AT3?
All 1.5SMC68AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC68AT3, 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 1.5SMC68AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC68AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC68AT3 Tags
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