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onsemi SZ1.5SMC16AT3G
- Part No.:
- SZ1.5SMC16AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SZ1.5SMC16AT3G.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
SZ1.5SMC16AT3G from onsemi 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 13.6 V working peak reverse voltage (VRWM), 16 V nominal Zener breakdown voltage (VBR), clamps to ≤22.5 V at 67 A peak pulse current (IPP), and responds in <1.0 ns - used in automotive power supply input stages, industrial PLC I/O modules, and medical equipment front-end surge protection.
For engineers reviewing the SZ1.5SMC16AT3G 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, UL 497B certification for isolated loop compliance, and AEC−Q101 qualification for automotive deployment.
Technical Context
This device operates as a Zener-based unidirectional TVS, leveraging avalanche breakdown to clamp transients above VRWM while maintaining low leakage (<5 µA @ 13.6 V). Its 1500 W peak power rating is defined per 10/1000 µs waveform with <1.0 ns response time and 0.086 %/°C temperature coefficient of VBR.
The SMC package enables surface-mount integration with modified L-bend leads for robust PCB bonding, void-free thermosetting plastic case rated for 260°C soldering, and cathode polarity indicated by molded notch - optimized for high-energy surge suppression without series impedance or control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 10/1000 µs waveform - sustains single high-energy surges common in ISO 7637-2 automotive load dump or IEC 61000-4-5 Level 4 events |
| Working Peak Reverse Voltage (VRWM) | 13.6 V - sets minimum system operating voltage threshold; must exceed max DC rail voltage to avoid leakage conduction during normal operation |
| Zener Breakdown Voltage (VBR) | 16 V (min) / 16.8 V (nom) / 17.1 V (max) @ 1 A test current - defines precise clamping onset point under controlled DC conditions |
| Clamping Voltage (VC) | 22.5 V @ 67 A IPP - actual voltage seen by protected circuit during surge; determines margin below downstream IC absolute maximum ratings |
| Leakage Current (IR) | <5 µA @ 13.6 V - ensures negligible standby power loss and no interference with high-impedance sensing circuits |
| Response Time | <1.0 ns - enables suppression before fast-rising ESD or lightning-induced transients propagate into sensitive nodes |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level electrostatic discharge immunity |
Pinout & Package
Package: SMC (Case 403), surface-mount, Pb-free, void-free thermosetting plastic housing with modified L-bend leads and cathode polarity notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to system ground or low-side reference; forms return path for clamped surge current |
| Cathode | Protected line connection terminal | Connected to the rail or signal line requiring overvoltage protection; voltage clamping occurs between cathode and anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive underhood and powertrain applications with extended temperature cycling and reliability testing |
| UL 497B recognized (QVGQ2) | Approved for isolated loop circuit protection in telecom and industrial safety-critical systems |
| Low dynamic impedance | Ensures stable clamping performance across varying surge amplitudes and temperatures |
| Thermal resistance (RJL) | 54.6 °C/W junction-to-lead - supports high-power dissipation with minimal thermal derating on standard FR-4 PCBs |
| Pb-free SURMETIC® package | RoHS-compliant construction with corrosion-resistant finish and solderable leads per J-STD-020 |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump transients per ISO 7637-2 Pulse 5a (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed directly across input terminals to clamp overvoltage before it reaches DC/DC converter input stage. Use Value: Clamps to 22.5 V at 67 A, providing >3.5 V margin below typical 26 V absolute max rating of automotive-grade buck controllers. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each channel's input node to shunt induced transients from long cable runs. Use Value: 13.6 V VRWM allows reliable operation at nominal 24 V ±10% supply while suppressing >1 kV fast transients per IEC 61000-4-4. |
| Medical Equipment Power Entry | Telecom Isolated Data Line Protection |
Use Scenario: Front-end protection of AC/DC adapter outputs powering diagnostic imaging subsystems. IC Role / Device Role / Timing Role: TVS mounted at board edge to absorb switching noise and external surge coupling into low-noise analog power domains. Use Value: UL 497B recognition validates compliance with isolation barrier requirements for patient-connected devices. |
Use Scenario: Surge protection on RS-485 bus lines in building automation gateways with galvanically isolated interfaces. IC Role / Device Role / Timing Role: Unidirectional TVS on each differential line referenced to isolated ground plane to prevent common-mode overvoltage breakdown. Use Value: 1500 W rating handles repeated lightning-induced surges on outdoor-installed cabling without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1.5SMC15AT3G | Lower VRWM (12.8 V), lower VBR (15 V), clamps to 21.2 V @ 71 A | Better suited for 12 V systems with tighter clamping margin; slightly higher IPP but lower VC | Select when system nominal voltage is ≤12 V and clamping headroom below 21.2 V is required |
| SZ1.5SMC18AT3G | Higher VRWM (15.3 V), higher VBR (18 V), clamps to 25.2 V @ 59.5 A | Preferred for 15–18 V intermediate rails where higher VRWM prevents false triggering | Select when protecting 15 V or 18 V supplies with higher operating voltage tolerance |
Compared with SZ1.5SMC16AT3G, the SZ1.5SMC15AT3G offers tighter clamping at lower voltage but reduced VRWM margin, while SZ1.5SMC18AT3G provides greater VRWM headroom at the cost of higher clamping voltage - choice depends on system operating voltage and protected IC voltage tolerance.
Availability
SZ1.5SMC16AT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical power supply designs requiring stable component supply with full AEC−Q101 traceability and UL 497B certification.
Supply support for SZ1.5SMC16AT3G 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZ1.5SMC16AT3G belongs to the SMC-series Zener TVS family, engineered specifically for high-reliability unidirectional surge suppression in harsh environments - emphasizing AEC−Q101 qualification, UL 497B recognition, and robust 1500 W pulse handling.
FAQ
What is the maximum clamping voltage of the SZ1.5SMC16AT3G under surge conditions?
The SZ1.5SMC16AT3G clamps to a maximum of 22.5 V when subjected to its rated peak pulse current of 67 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed across temperature and represents the highest voltage that will appear across the protected circuit during a worst-case transient event. The SZ1.5SMC16AT3G maintains this clamping performance with low dynamic impedance and minimal variation due to its Zener-based structure.
Is the SZ1.5SMC16AT3G suitable for automotive applications?
Yes, the SZ1.5SMC16AT3G is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and infotainment power inputs. Its 13.6 V VRWM aligns with 12 V battery systems, and its 1500 W rating meets ISO 7637-2 load dump requirements. The SZ1.5SMC16AT3G also features enhanced process controls and site-specific change management indicated by the "SZ" prefix.
Does the SZ1.5SMC16AT3G have UL recognition?
Yes, the SZ1.5SMC16AT3G carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification confirms successful completion of strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - exceeding basic flammability requirements. The SZ1.5SMC16AT3G is approved for use in telecom, industrial, and medical systems requiring certified surge protection.
What is the thermal resistance and power derating behavior of the SZ1.5SMC16AT3G?
The SZ1.5SMC16AT3G has a junction-to-lead thermal resistance (RJL) of 54.6 °C/W and a junction-to-ambient (RJA) of 165 °C/W on standard FR-4. Its DC power dissipation is 0.75 W at 25°C ambient, derating linearly above that temperature. For pulsed operation, peak power remains 1500 W at 25°C lead temperature but must be reduced per the Figure 3 derating curve when lead temperature exceeds 75°C.
How does the SZ1.5SMC16AT3G differ from the non-SZ version 1.5SMC16AT3G?
The SZ1.5SMC16AT3G includes automotive-grade process controls, site-specific change management, and PPAP documentation support not present in the commercial-grade 1.5SMC16AT3G. Both share identical electrical specifications and packaging, but only the SZ prefix variant is AEC−Q101 qualified and intended for automotive and other high-reliability applications requiring strict change control. The SZ1.5SMC16AT3G is the appropriate choice for OEM automotive BOMs.
SZ1.5SMC16AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 13.6V
- Voltage - Breakdown (Min):
- 15.2V
- Voltage - Clamping (Max) @ Ipp:
- 22.5V
- Current - Peak Pulse (10/1000µs):
- 67A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SZ1.5SMC16AT3G FAQ
1.How can I place an order for SZ1.5SMC16AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1.5SMC16AT3G 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 SZ1.5SMC16AT3G reliable?
The price and inventory of SZ1.5SMC16AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1.5SMC16AT3G is usually 5 days.
3.What payment methods are accepted for SZ1.5SMC16AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1.5SMC16AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1.5SMC16AT3G?
SZ1.5SMC16AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1.5SMC16AT3G 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 SZ1.5SMC16AT3G?
For technical support, including SZ1.5SMC16AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1.5SMC16AT3G requirements.
6.How does Aetrix verify that SZ1.5SMC16AT3G is sourced from the original manufacturer or authorized distributors?
All SZ1.5SMC16AT3G 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 SZ1.5SMC16AT3G meets industry standards.
7.What is the process for return or replacement of SZ1.5SMC16AT3G?
All SZ1.5SMC16AT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1.5SMC16AT3G, 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 SZ1.5SMC16AT3G part is unused and in its original packaging.
Return procedure for SZ1.5SMC16AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZ1.5SMC16AT3G Tags
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