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onsemi SZ1.5SMC39AT3G
- Part No.:
- SZ1.5SMC39AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SZ1.5SMC39AT3G.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:39,146
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Product details
Overview
SZ1.5SMC39AT3G from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of sensitive electronics. It features a 33.3 V working peak reverse voltage (VRWM), 39 V nominal breakdown voltage (VBR) at 1 mA test current, clamps to ≤53.9 V at 28 A peak pulse current, and responds in <1.0 ns-ideal for safeguarding power supplies and automotive control modules against ESD and lightning-induced surges.
For engineers reviewing the SZ1.5SMC39AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, clamping voltage margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop protection, and AEC−Q101 qualification for automotive deployment.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents <5 µA leakage above VRWM; during transients exceeding VBR, it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its unidirectional polarity enables DC-biased line protection without forward-conduction interference.
Thermal design relies on junction-to-lead resistance of 18.3 °C/W and 75°C derating threshold; mechanical robustness includes SURMETIC® molded package with modified L-bend leads, 260°C solderability, and cathode notch polarity marking-optimized for high-reliability surface-mount assembly in industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without failure |
| Working Peak Reverse Voltage | 33.3 V - sets minimum system operating voltage compatibility (e.g., 24 V rail + 40% tolerance) |
| Breakdown Voltage | 39 V ±5% @ 1 mA - defines precise avalanche onset point for predictable clamping initiation |
| Clamping Voltage | ≤53.9 V @ 28 A - ensures protected ICs with 55 V abs max rating remain within safe margin |
| Leakage Current | <5 µA @ 33.3 V - prevents measurable power loss or signal distortion in standby operation |
| Response Time | <1.0 ns - limits voltage overshoot before clamping engages, critical for fast-edge transients |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for board-level ESD immunity |
| UL Recognition | UL 497B (QVGQ2 File #E210057) - certified for isolated telecom/data line protection |
Pinout & Package
Package: SMC (Case 403), surface-mount, Pb-free, void-free thermosetting plastic with corrosion-resistant finish and modified L-bend leads. Cathode identified by molded notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or low-impedance reference plane to complete surge diversion loop |
| Cathode | Protected line connection | Connected to input/output line being safeguarded; polarity must match DC bias direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive underhood applications including engine control units and body electronics |
| UL 497B recognition | Meets stringent isolation and endurance requirements for telecom/data line protectors |
| Low zener impedance | Enables stable clamping across wide current range (1–28 A), minimizing voltage rise during surge |
| Fast response time | <1.0 ns turn-on reduces overshoot risk in high-speed digital and power supply inputs |
| Pb-free SURMETIC® package | RoHS-compliant construction with enhanced thermal dissipation and solder joint reliability |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power lines and sensor supply rails in engine control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching regulator ICs and microcontrollers. Use Value: Maintains system uptime by preventing latch-up or permanent damage to 3.3 V/5 V logic from >100 V spikes. | Use Scenario: Safeguarding analog input channels (4–20 mA, 0–10 V) on programmable logic controller backplanes exposed to field wiring surges. IC Role / Device Role / Timing Role: Unidirectional clamping device installed per channel to limit voltage excursions without interfering with DC signal integrity. Use Value: Eliminates false triggering and measurement errors caused by transient-induced ADC saturation. |
| Medical Equipment Power Entry | Telecom Isolated Data Lines |
Use Scenario: Overvoltage protection on AC/DC adapter outputs feeding patient-monitoring devices requiring IEC 60601-1 compliance. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of secondary-side regulators and isolated DC/DC converters. Use Value: Ensures continuous operation during hospital-grade power grid disturbances while meeting creepage/clearance safety standards. | Use Scenario: UL 497B-certified protection on RS-485/RS-232 isolated data ports in network switches and base station controllers. IC Role / Device Role / Timing Role: Transient suppressor bridging isolated ground domains to absorb common-mode surges without compromising galvanic isolation. Use Value: Prevents communication lockup and component stress during lightning-induced ground potential differences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39A | 600 W peak power, SMA package (smaller footprint, lower thermal mass) | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load dump | Select when space-constrained PCB layout prioritizes size over surge robustness |
| 1.5KE39A | Through-hole DO-201 package, identical 1500 W rating but slower response (~1.5 ns) | Requires wave soldering; less suitable for automated SMT production and high-frequency transient suppression | Choose for legacy through-hole designs where rework flexibility outweighs surface-mount efficiency |
Compared with SMAJ39A and 1.5KE39A, the SZ1.5SMC39AT3G delivers superior surge handling in compact SMT form with automotive-grade qualification and faster response-making it optimal for new designs targeting AEC−Q101 compliance and high-reliability industrial deployment.
Availability
SZ1.5SMC39AT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, medical power supplies, and telecom interface protection requiring stable component supply across multi-year production cycles.
Supply support for SZ1.5SMC39AT3G 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 supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The SZ1.5SMC39AT3G belongs to ON Semiconductor's SMC-series Zener TVS family, engineered specifically for high-energy transient suppression in harsh environments where reliability, fast response, and regulatory certification are mandatory.
FAQ
What is the maximum clamping voltage of the SZ1.5SMC39AT3G at its rated peak pulse current?
The SZ1.5SMC39AT3G clamps to a maximum of 53.9 V at its specified peak pulse current of 28 A. This value is measured under the standardized 10/1000 µs waveform per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. Engineers use this parameter to verify margin against downstream IC absolute maximum ratings.
Is the SZ1.5SMC39AT3G suitable for bidirectional signal line protection?
No, the SZ1.5SMC39AT3G is a unidirectional TVS diode and must be used only on DC-biased lines where polarity is fixed. It conducts in reverse avalanche mode during overvoltage but blocks forward current beyond ~3.5 V. For AC or bidirectional data lines like USB or RS-485, a dedicated bidirectional variant (e.g., SZ1.5SMC39AT3G's counterpart with "CA" suffix) is required.
Does the SZ1.5SMC39AT3G meet automotive qualification standards?
Yes, the SZ1.5SMC39AT3G is AEC−Q101 qualified and PPAP capable. This certification confirms its suitability for automotive applications including engine control, body electronics, and ADAS subsystems. The "SZ" prefix explicitly denotes parts manufactured under automotive-specific process controls and site qualifications per AEC−Q101 requirements.
What is the thermal resistance specification for the SZ1.5SMC39AT3G, and how does it affect layout?
The SZ1.5SMC39AT3G has a junction-to-lead thermal resistance (RJL) of 18.3 °C/W. This means each watt of sustained power dissipation raises the junction temperature by 18.3°C above lead temperature. Layout must provide adequate copper area (per ON Semiconductor's Case 403 footprint recommendation) and minimize thermal path length to maintain junction temperature below 150°C during repetitive surge events.
How does UL 497B recognition benefit system-level certification of equipment using the SZ1.5SMC39AT3G?
UL 497B recognition (File #E210057) certifies that the SZ1.5SMC39AT3G meets rigorous requirements for protectors in telecommunications and data line applications-including strike voltage breakdown, endurance conditioning, and dielectric withstand testing. This pre-qualification simplifies end-equipment listing by reducing required test scope and supporting claims of isolation integrity in safety-critical systems.
SZ1.5SMC39AT3G 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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
SZ1.5SMC39AT3G FAQ
1.How can I place an order for SZ1.5SMC39AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1.5SMC39AT3G 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 SZ1.5SMC39AT3G reliable?
The price and inventory of SZ1.5SMC39AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1.5SMC39AT3G is usually 5 days.
3.What payment methods are accepted for SZ1.5SMC39AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1.5SMC39AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1.5SMC39AT3G?
SZ1.5SMC39AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1.5SMC39AT3G 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 SZ1.5SMC39AT3G?
For technical support, including SZ1.5SMC39AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1.5SMC39AT3G requirements.
6.How does Aetrix verify that SZ1.5SMC39AT3G is sourced from the original manufacturer or authorized distributors?
All SZ1.5SMC39AT3G 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 SZ1.5SMC39AT3G meets industry standards.
7.What is the process for return or replacement of SZ1.5SMC39AT3G?
All SZ1.5SMC39AT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1.5SMC39AT3G, 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 SZ1.5SMC39AT3G part is unused and in its original packaging.
Return procedure for SZ1.5SMC39AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZ1.5SMC39AT3G Tags
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