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onsemi 1.5SMC33AT3
- Part No.:
- 1.5SMC33AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1.5SMC33AT3.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,081
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Product details
Overview
1.5SMC33AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 28.2 V working peak reverse voltage (VRWM), 33 V breakdown voltage (VBR) at 1 mA test current, and clamps to 45.7 V at 33 A peak pulse current - enabling robust surge suppression in power supply rails and interface lines.
For engineers reviewing the 1.5SMC33AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, UL 497B certification for isolated loop protection, ESD rating >16 kV HBM, sub-1 ns response time, and SMC package thermal performance under repetitive surge conditions.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device, entering avalanche conduction when reverse voltage exceeds its 33 V nominal breakdown threshold. Its low dynamic impedance ensures stable clamping during 10/1000 µs transients up to 1500 W peak power, with <5 µA leakage above 28.2 V VRWM.
The device uses silicon planar junction construction in an epoxy-molded Surmetic™ SMC package, optimized for surface-mount reliability in high-energy surge environments. Thermal resistance from junction to lead is 54.6 °C/W, supporting sustained operation at TL ≤ 75°C with 4.0 W DC dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28.2 V - maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin for safe operation. |
| VBR @ IT=1 mA | 33 V (min–max: 31.4–34.7 V) - precise Zener breakdown threshold defining turn-on consistency across production lots. |
| VC @ IPP=33 A | 45.7 V - clamping voltage under full-rated 1500 W surge; determines maximum stress imposed on protected downstream circuitry. |
| IPP | 33 A - peak pulse current corresponding to 1500 W @ 1 ms, used to size series impedance (ZIN) in protection circuits. |
| IR @ VRWM | <5 µA - ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance sensing or bias networks. |
| Response Time | <1 ns - enables effective suppression of fast-rising ESD and lightning-induced transients before damage occurs. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - qualifies for direct I/O port protection in industrial and automotive interfaces. |
Pinout & Package
1.5SMC33AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a cathode-indicated molded notch and modified L-bend leads for enhanced solder joint reliability. The package measures 7.75 × 6.10 × 2.41 mm (L × W × H) with FR-4 board-compatible thermal pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-impedance reference; must be routed with minimal inductance to avoid overshoot. |
| Cathode | High-side connection to protected line | Placed directly at IC power input or connector entry point; polarity notch identifies this terminal physically. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGV2) | Validated for isolated loop circuit protection - meets safety requirements for telecom, medical, and industrial isolation barriers. |
| Surmetic™ Molded Package | Void-free thermosetting plastic with corrosion-resistant finish and 260°C/10s solder tolerance - ensures long-term reliability in harsh reflow and field environments. |
| Temperature Coefficient | 0.098 %/°C - predictable VBR drift over –65°C to +150°C operating range supports stable protection in wide-temperature applications. |
| Low Clamping Ratio | VC/VBR = 45.7/33 ≈ 1.38 - tight ratio minimizes overvoltage exposure while maintaining margin against false triggering. |
| High Surge Robustness | Rated for 200 A non-repetitive forward surge (IFSM) - withstands accidental reverse-bias faults or inrush events without degradation. |
Applications
| Industrial Power Supply Input Protection | Automotive ECUs & Sensor Interfaces |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails in PLC modules and motor drives from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, activated within <1 ns to clamp transients exceeding 28.2 V. Use Value: Limits peak voltage to 45.7 V during 33 A surges, preventing damage to upstream DC-DC controllers and downstream logic ICs. |
Use Scenario: Safeguarding CAN transceiver VCC pins and LIN bus lines in engine control units exposed to battery transients. IC Role / Device Role / Timing Role: Parallel-connected TVS referenced to chassis ground, suppressing spikes induced by alternator load dump or relay switching. Use Value: UL 497B recognition validates use in safety-critical isolated subsystems; 16 kV HBM ESD rating covers connector-level ESD events. |
| Medical Equipment Isolated Power Rails | Telecom Line Card Surge Protection |
|
Use Scenario: Protecting secondary-side 12–24 V outputs of isolated AC-DC adapters in diagnostic imaging and patient monitors. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated DC output, clamping surges coupled through transformer parasitics or ground bounce. Use Value: Low leakage (<5 µA) avoids loading precision bias networks; 1500 W rating handles rare but catastrophic coupling events. |
Use Scenario: Front-end protection of Ethernet PHY power supplies and RS-485 transceivers in base station line cards. IC Role / Device Role / Timing Role: Unidirectional TVS on VDD rail, coordinated with series impedance to meet IEC 61000-4-5 Level 4 (4 kV) requirements. Use Value: 45.7 V clamping voltage provides sufficient margin above 3.3/5/12 V rails while meeting strict telecom surge immunity standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Same 33 V VBR but lower 600 W peak power rating and SMB package (smaller thermal mass). | Limited to lower-energy transients; unsuitable for automotive load dump or industrial 1500 W surge compliance. | Select only where space constraints prohibit SMC footprint and surge energy is confirmed ≤600 W. |
| 1.5KE33A | Through-hole TO-204AA package; identical 33 V VBR and 1500 W rating but higher junction-to-ambient thermal resistance (165 °C/W). | Requires larger PCB area and manual assembly; less suitable for automated SMT production or compact designs. | Prefer for legacy through-hole systems or prototyping where reflow compatibility is not required. |
Compared with SMBJ33A and 1.5KE33A, the 1.5SMC33AT3 delivers optimal balance of high-energy surge handling, SMT manufacturability, and UL-certified isolation barrier compliance - making it the preferred choice for new industrial and automotive designs requiring surface-mount 1500 W TVS protection.
Availability
1.5SMC33AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and medical isolated power rails requiring stable component supply and certified surge protection performance.
Supply support for 1.5SMC33AT3 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, sensor, and discrete devices for automotive, industrial, and communications markets.
The 1.5SMC33AT3 belongs to the SMC-series transient voltage suppressors - engineered specifically for high-reliability, high-energy surge protection in surface-mount power and interface circuits.
FAQ
What is the working peak reverse voltage (VRWM) of the 1.5SMC33AT3?
The 1.5SMC33AT3 has a working peak reverse voltage (VRWM) of 28.2 V, meaning it remains in high-impedance blocking mode up to this voltage under normal operation. This value ensures reliable operation in 24 V systems with headroom for ripple and tolerance, while triggering clamping only during overvoltage events exceeding this threshold.
Does the 1.5SMC33AT3 meet UL 497B certification?
Yes, the 1.5SMC33AT3 is UL Recognized under file #116110 for classification QVGV2 per UL 497B, specifically validating its suitability for isolated loop circuit protection. This certification covers testing for strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - critical for telecom and medical isolation applications.
What is the clamping voltage of the 1.5SMC33AT3 at its rated peak pulse current?
The 1.5SMC33AT3 clamps to a maximum of 45.7 V at its rated peak pulse current of 33 A (corresponding to 1500 W @ 1 ms). This VC value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and must be verified against downstream component absolute maximum ratings.
Is the 1.5SMC33AT3 unidirectional or bidirectional?
The 1.5SMC33AT3 is a unidirectional transient voltage suppressor, designed for DC or single-polarity signal line protection. Its cathode-anode polarity is marked by a molded notch on the SMC package body, and it conducts only during reverse-biased overvoltage events - unlike bidirectional variants which protect AC or dual-rail systems.
What package type does the 1.5SMC33AT3 use, and what are its key mechanical features?
The 1.5SMC33AT3 uses the SMC (DO-214AB) surface-mount package (Case 403), measuring 7.75 × 6.10 × 2.41 mm. Key features include void-free Surmetic™ thermosetting plastic molding, corrosion-resistant finish, modified L-bend leads for improved solder joint strength, and a cathode polarity notch - all supporting high-reliability automated assembly and thermal performance.
1.5SMC33AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
- -
1.5SMC33AT3 FAQ
1.How can I place an order for 1.5SMC33AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33AT3 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 1.5SMC33AT3 reliable?
The price and inventory of 1.5SMC33AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC33AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33AT3?
1.5SMC33AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33AT3 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 1.5SMC33AT3?
For technical support, including 1.5SMC33AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33AT3 requirements.
6.How does Aetrix verify that 1.5SMC33AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33AT3 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 1.5SMC33AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC33AT3?
All 1.5SMC33AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33AT3, 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 1.5SMC33AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC33AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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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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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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