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onsemi 1SMC54AT3
- Part No.:
- 1SMC54AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC54AT3.pdf
- Description:
- TVS DIODE 54VWM 87.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,490
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Product details
Overview
1SMC54AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 54 V working peak reverse voltage (VRWM), 63.15 V nominal breakdown voltage (VBR) at 1 mA test current, clamps to ≤87.1 V at 17.2 A peak pulse current, and responds in <1 ns - deployed in industrial power supplies, automotive ECUs, and medical equipment front-end protection.
For engineers reviewing the 1SMC54AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, VRWM alignment with system operating voltage, UL 497B certification for isolated loop compliance, and SMC package thermal performance under repetitive surge conditions.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device, conducting only during overvoltage transients above its breakdown threshold while remaining high-impedance under normal operation. Its Zener-based avalanche structure delivers low dynamic impedance and stable voltage clamping across temperature, with specified temperature coefficient and derating curves for ambient and lead temperatures.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs waveform), supports 200 A forward surge current (8.3 ms half-sine), and meets UL 497B Class 3 ESD immunity (>16 kV HBM). The device is Pb-free, housed in ON Semiconductor's Surmetic SMC package (Case 403), and optimized for surface-mount PCB layout with minimal parasitic inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 10/1000 µs waveform - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage (VRWM) | 54 V - maximum continuous DC or peak AC voltage the device blocks without conduction |
| Breakdown Voltage (VBR) | 63.15 V min / 66.3 V typ @ 1 mA - precise Zener onset threshold for predictable clamping initiation |
| Clamping Voltage (VC) | ≤87.1 V @ 17.2 A IPP - limits transient voltage seen by downstream circuitry to safe levels |
| Leakage Current (IR) | <5 µA @ 54 V - negligible standby power loss and no interference with low-power circuits |
| Response Time | <1 ns - ensures clamping activation before most semiconductor damage thresholds are exceeded |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - qualifies for harsh electrostatic environments |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - certified for isolated loop circuit protection in safety-critical systems |
Pinout & Package
The 1SMC54AT3 is housed in an SMC (DO-214AB) surface-mount plastic package (Case 403), featuring a modified L-bend lead form for enhanced solder joint reliability and a molded cathode notch for polarity identification. Maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamp | Connected to lower-potential side of protected line (e.g., ground or return path) |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to higher-potential side (e.g., VIN, signal line); marked by molded notch |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic SMC package | Void-free thermoset molding with corrosion-resistant finish and solderable leads - enables high-reliability automated assembly |
| Low clamping ratio (VC/VBR) | ~1.38 - tight voltage control minimizes stress on protected ICs without overdesigning margin |
| Thermal derating support | RJL = 18.3 °C/W (junction-to-lead) - allows direct thermal coupling to copper pour for sustained surge handling |
| Pb-free construction | G-suffix indicates RoHS-compliant, lead-free terminations - meets global environmental compliance requirements |
| Fast transient response | <1 ns turn-on - critical for protecting high-speed interfaces and microcontrollers against EFT and lightning-induced spikes |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between +24 V rail and chassis ground to limit transient excursions to <90 V. Use Value: 1SMC54AT3's 54 V VRWM matches nominal 24 V system with 100 % headroom, and 87.1 V clamping ensures MCU and PMIC remain within 100 V absolute max rating. |
Use Scenario: CAN_H/CAN_L lines in BCM subjected to ESD events and coupled transients from adjacent high-current solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS on each CAN line referenced to ground, leveraging fast response to suppress sub-10 ns ESD bursts. Use Value: UL 497B recognition validates isolation integrity; <1 ns response prevents bit errors during CAN arbitration, and low leakage avoids bus bias shift. |
| Medical Equipment Isolated Sensor Interface | Telecom Line Card Surge Protection |
Use Scenario: 5 V analog sensor supply rail in patient-monitoring device requiring IEC 60601-1 compliance and galvanic isolation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 5 V rail, coordinated with upstream isolation barrier and fuse. Use Value: 1SMC54AT3's 54 V VRWM provides ample margin above 5 V, while UL 497B certification supports creepage/clearance validation for isolated loops. |
Use Scenario: TIP/RING interface of VoIP gateway exposed to lightning-induced surges on POTS lines per GR-1089-CORE. IC Role / Device Role / Timing Role: First-stage shunt protector on line side, paired with gas discharge tube (GDT) and series impedance. Use Value: 1500 W peak power handles 10/700 µs telecom surges; 87.1 V clamping aligns with SLIC IC withstand ratings, and SMC footprint enables compact dual-line layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ54A | Same VRWM (54 V) and VC (87.1 V), but 600 W peak power (SMB package) | Limited to lower-energy transients; unsuitable for load dump or high-current surge scenarios | Select when board space is constrained and surge threat level is defined as IEC 61000-4-5 Level 3 (0.5 kV/1.0 kV) |
| 1.5SMC54A | Identical electrical specs and SMC package, but legacy ON Semi marking (non-G suffix) | No functional difference; lacks explicit Pb-free designation and updated UL 497B file reference | Acceptable for legacy designs where RoHS compliance is not required and UL documentation traceability is not mandated |
Compared with SMBJ54A, the 1SMC54AT3 delivers 2.5× higher surge energy handling in the same mounting footprint; versus 1.5SMC54A, it adds documented Pb-free compliance and current UL 497B certification - critical for new industrial and medical certifications.
Availability
1SMC54AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and medical sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for 1SMC54AT3 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 1SMC54AT3 belongs to the SMC-series Zener TVS family, engineered specifically for high-energy transient suppression in harsh environments - emphasizing robustness, UL-certified reliability, and surface-mount manufacturability.
FAQ
What is the clamping voltage of the 1SMC54AT3 at its rated peak pulse current?
The 1SMC54AT3 clamps to a maximum of 87.1 V at its specified peak pulse current of 17.2 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 transient event. Designers must verify that this clamping level remains safely below the absolute maximum voltage rating of downstream components. The 1SMC54AT3 achieves this performance using a Zener avalanche structure with low dynamic impedance.
Is the 1SMC54AT3 suitable for bidirectional transient protection?
No, the 1SMC54AT3 is a unidirectional TVS diode and is not rated for bidirectional operation. Its design conducts only in reverse breakdown (cathode positive relative to anode) and blocks forward voltage up to ~3.5 V. For AC or bipolar signal line protection, a dedicated bidirectional part such as the 1SMC54CA must be used. The 1SMC54AT3 datasheet explicitly states "Bidirectional devices will not be available in this series," confirming its unidirectional-only functionality.
Does the 1SMC54AT3 have UL recognition, and for what standard?
Yes, the 1SMC54AT3 carries UL recognition under standard UL 497B (File #E210057, category QVGQ2) for protectors in isolated loop circuits. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - exceeding basic flammability requirements. The UL 497B listing is critical for medical, industrial, and telecom applications where regulatory approval of surge protection is mandatory, and the 1SMC54AT3 is explicitly validated for this use case.
What is the thermal resistance and power derating behavior of the 1SMC54AT3?
The 1SMC54AT3 has a junction-to-lead thermal resistance (RJL) of 18.3 °C/W and a junction-to-ambient resistance (RJA) of 165 °C/W on a standard FR-4 board. Its DC power dissipation derates linearly above 75°C (for lead temperature) or 25°C (for ambient temperature), with full 4.0 W capability at 75°C lead temp and 0.75 W at 25°C ambient. These values guide heatsinking decisions and ensure reliable operation under sustained surge duty cycles - essential for 1SMC54AT3 deployment in enclosed industrial enclosures.
How does the 1SMC54AT3 compare to the SMBJ54A in terms of surge handling capability?
The 1SMC54AT3 delivers 1500 W peak pulse power, whereas the SMBJ54A is rated for 600 W - making the 1SMC54AT3 2.5× more capable for high-energy threats like automotive load dump or lightning-induced surges. Both share identical VRWM (54 V) and clamping voltage (87.1 V), but the 1SMC54AT3's larger SMC package enables superior thermal mass and surge current handling. The 1SMC54AT3 is therefore preferred in demanding applications where the SMBJ54A would fail prematurely under repeated or high-amplitude transients.
1SMC54AT3 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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
1SMC54AT3 FAQ
1.How can I place an order for 1SMC54AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC54AT3 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 1SMC54AT3 reliable?
The price and inventory of 1SMC54AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC54AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC54AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC54AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC54AT3?
1SMC54AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC54AT3 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 1SMC54AT3?
For technical support, including 1SMC54AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC54AT3 requirements.
6.How does Aetrix verify that 1SMC54AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC54AT3 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 1SMC54AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC54AT3?
All 1SMC54AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC54AT3, 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 1SMC54AT3 part is unused and in its original packaging.
Return procedure for 1SMC54AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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