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onsemi 1.5SMC30AT3
- Part No.:
- 1.5SMC30AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC30AT3.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,500
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Product details
Overview
1.5SMC30AT3 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 25.6 V working peak reverse voltage (VRWM), 30 V nominal Zener breakdown voltage (VBR), clamps to ≤41.4 V at 36 A peak pulse current (IPP), and responds in <1.0 ns - used in automotive power supply input stages, industrial PLC I/O modules, and telecom surge interfaces.
For engineers reviewing the 1.5SMC30AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, clamping voltage margin vs. protected IC absolute maximum rating, UL 497B certification for isolated loop protection, and SMC package thermal performance under repetitive surge conditions.
Technical Context
The 1.5SMC30AT3 operates as a Zener-based unidirectional TVS diode, entering avalanche conduction when reverse voltage exceeds its 30 V breakdown threshold. Its low dynamic impedance (<0.097 Ω derived from ΔVBR/ΔIT) ensures tight clamping during 8.3 ms half-sine surges up to 36 A.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal derating starting at 75°C junction temperature and a 54.6 °C/W junction-to-lead thermal resistance. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1.0 ms (10/1000 µs waveform); sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 25.6 V; maximum continuous DC or peak AC voltage the device blocks before clamping |
| Zener Breakdown Voltage (VBR) | 30 V @ 1 mA test current; precise threshold for initiating avalanche conduction |
| Clamping Voltage (VC) | 41.4 V @ 36 A IPP; maximum voltage imposed on protected circuit during worst-case surge |
| Leakage Current (IR) | <5 µA @ 25.6 V VRWM; negligible standby power loss and minimal loading on sensitive sources |
| Response Time | <1.0 ns; enables suppression before fast-rising ESD or lightning-induced edges propagate |
| ESD Rating | Class 3 (>16 kV HBM); qualified for direct human-contact interfaces per JEDEC JS-001 |
Pinout & Package
1.5SMC30AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a molded cathode notch polarity indicator and modified L-bend leads for enhanced pad adhesion. Maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or low-impedance reference; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to line being safeguarded (e.g., 24 V rail); voltage referenced to anode during conduction |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - validated for strike voltage, endurance, dielectric withstand, and discharge performance |
| Low Clamping Ratio | VC/VBR = 41.4 V / 30 V = 1.38; tighter than typical 1.5–1.7 ratio, preserving margin for downstream ICs |
| Pb-Free SURMETIC® Package | Void-free thermoset molding with corrosion-resistant finish and solderable leads - compliant with RoHS and J-STD-020 reflow profiles |
| High Surge Robustness | Withstands 200 A forward surge (IFSM) and 36 A reverse pulse (IPP) - suitable for automotive load-dump and industrial 4–20 mA loop protection |
| Negligible Capacitance | Typical junction capacitance <100 pF at 0 V; avoids signal integrity degradation on data lines up to ~10 MHz |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC inputs of programmable logic controller analog/digital I/O cards against induced surges from relay switching and motor noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between field input terminal and internal regulator input, clamping transients before they reach precision ADC front-end or microcontroller GPIO. Use Value: 41.4 V clamping ensures protected 24 V rail stays below 30 V absolute max rating of common industrial op-amps and level translators. |
Use Scenario: Safeguarding LIN bus transceiver power pins and wake-up inputs against battery load dump (ISO 7637-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on VCC line of LIN transceiver IC, activated within <1 ns to limit overvoltage during 100 V/100 ms pulses. Use Value: 1500 W peak power rating handles ISO 7637-2 severity Level IV pulses without degradation; AEC-Q101 qualification confirms automotive reliability. |
| Telecom Power Interface | Medical Equipment Power Entry |
Use Scenario: Front-end protection of 48 V DC power entry in PoE-powered network switches and base station remote radios. IC Role / Device Role / Timing Role: First-stage TVS on primary DC input, coordinated with upstream fuse and downstream π-filter to absorb lightning-induced surges per IEC 61000-4-5. Use Value: UL 497B recognition validates suitability for telecom isolated power circuits; 25.6 V VRWM matches 48 V nominal systems with 50% derating margin. |
Use Scenario: Overvoltage protection on auxiliary 12 V/24 V DC power rails feeding patient-monitoring sensor modules and display controllers. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) TVS on secondary-side power distribution, preventing false resets or latch-up during ESD events near operator interface panels. Use Value: Class 3 HBM ESD rating (>16 kV) satisfies IEC 60601-1-2 immunity requirements; Pb-free SURMETIC® package supports medical RoHS compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Same 30 V VBR but lower 600 W peak power; SMB package (smaller footprint, higher thermal resistance) | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not rated for IEC 61000-4-5 surge | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| 1.5KE30A | Same 30 V VBR and 1500 W rating but through-hole DO-201 package; slower response (~1.5 ns) and no UL 497B recognition | Requires PCB real estate for axial leads; lacks certification for telecom isolated loop use | Select for legacy through-hole designs where rework tolerance and manual assembly outweigh surface-mount advantages. |
Compared with SMBJ30A and 1.5KE30A, the 1.5SMC30AT3 delivers identical clamping performance in a smaller SMC package with superior thermal dissipation, faster response, and UL 497B validation - making it optimal for space-constrained, certified industrial and automotive power interfaces.
Availability
1.5SMC30AT3 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power interface designs requiring stable component supply, long-term lifecycle support, and certified surge robustness.
Supply support for 1.5SMC30AT3 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 1.5SMC30AT3 belongs to ON Semiconductor's SMC-series Zener TVS family, engineered for high-energy transient suppression in harsh environments - targeting applications demanding UL recognition, AEC-Q101 qualification, and reliable operation from −65°C to +150°C.
FAQ
What is the clamping voltage of the 1.5SMC30AT3 at its rated peak pulse current?
The 1.5SMC30AT3 clamps to a maximum of 41.4 V at its rated peak pulse current of 36 A (10/1000 µs waveform). This value is specified in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet and represents the upper limit of voltage imposed on the protected circuit during worst-case surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1.5SMC30AT3 suitable for bidirectional signal line protection?
No, the 1.5SMC30AT3 is a unidirectional TVS diode and must not be used on AC or bidirectional signal lines without external biasing. Its cathode-anode polarity is fixed, and it conducts only during negative transients relative to the cathode. For bidirectional protection, a dedicated bidirectional part such as 1.5SMC30CA or separate back-to-back unidirectional devices would be required - the datasheet explicitly states bidirectional devices are not available in this series.
Does the 1.5SMC30AT3 meet automotive qualification standards?
Yes, the 1.5SMC30AT3 is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including body electronics and powertrain subsystems. It also meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized - all verified in the official ON Semiconductor datasheet revision 11 (February 2014) and supported by the SZ-prefix variant (SZ1.5SMC30AT3G) for automotive-specific traceability.
What is the maximum operating temperature range for the 1.5SMC30AT3?
The 1.5SMC30AT3 has an operating and storage temperature range of −65°C to +150°C, as specified in the Maximum Ratings table. This wide range supports deployment in under-hood automotive environments, industrial enclosures exposed to ambient extremes, and medical equipment requiring sterilization-compatible thermal cycling - with derating applied above 75°C junction temperature per the thermal resistance (RJL = 54.6 °C/W) and power curves in the datasheet.
How does the 1.5SMC30AT3 differ from the 1.5SMC30AT3G variant?
The 1.5SMC30AT3 and 1.5SMC30AT3G share identical electrical specifications, package (SMC), and performance - the "G" suffix denotes a Pb-free version compliant with RoHS Directive 2011/65/EU. Both are manufactured using ON Semiconductor's SURMETIC® process; the G variant uses lead-free terminations and conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) requirements, while the non-G version may contain lead in solderable finishes per legacy exemptions.
1.5SMC30AT3 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 36A
- 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
1.5SMC30AT3 FAQ
1.How can I place an order for 1.5SMC30AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC30AT3 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 1.5SMC30AT3 reliable?
The price and inventory of 1.5SMC30AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC30AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC30AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC30AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC30AT3?
1.5SMC30AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC30AT3 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 1.5SMC30AT3?
For technical support, including 1.5SMC30AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC30AT3 requirements.
6.How does Aetrix verify that 1.5SMC30AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC30AT3 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 1.5SMC30AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC30AT3?
All 1.5SMC30AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC30AT3, 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 1.5SMC30AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC30AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC30AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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