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onsemi P6SMB39AT3
- Part No.:
- P6SMB39AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
P6SMB39AT3.pdf
- Description:
- TVS ZENER UNIDIR 600W 39V SMB
- Quantity:
- Payment:
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Inventory:9,555
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Product details
Overview
P6SMB39AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 33.3 V working peak reverse voltage (VRWM), 39.05 V nominal Zener breakdown voltage (VBR) at 1 mA test current, clamps to 53.9 V at 11.2 A peak pulse current (IPP), and delivers sub-1 ns response time with <5 µA leakage above 10 V. It is used in automotive power supply input stages to suppress load-dump and ISO 7637-2 transients.
For engineers reviewing the P6SMB39AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC ≤ protected IC's absolute maximum rating, IPP capability matching expected surge energy, UL 497B recognition for isolated loop compliance, and SMB package thermal performance under 75°C lead temperature derating.
Technical Context
The P6SMB39AT3 operates as a silicon avalanche diode, entering controlled breakdown when reverse voltage exceeds VBR to shunt transient current away from downstream circuitry. Its low zener impedance ensures stable clamping across varying surge currents, while its thermally robust SURMETIC® SMB package enables 3.0 W DC dissipation at 75°C with 40°C/W junction-to-lead thermal resistance.
Designed for non-repetitive 10/1000 µs waveform surges up to 600 W, it complies with IEC 61000-4-2 ESD (Class 3, >16 kV HBM) and UL 497B for isolated loop protection. The device exhibits a +0.1%/°C temperature coefficient of VBR and 53.9 V maximum clamping voltage at 11.2 A, enabling predictable overvoltage limiting in industrial power supplies and automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms 10/1000 µs waveform - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 33.3 V - maximum continuous DC or peak AC voltage the device blocks before clamping |
| Zener Breakdown Voltage (VBR) | 39.05 V @ IT = 1 mA - precise avalanche onset threshold for reliable triggering |
| Maximum Clamping Voltage (VC) | 53.9 V @ IPP = 11.2 A - upper voltage limit imposed on protected circuit during surge |
| Leakage Current (IR) | <5 µA @ VRWM = 33.3 V - negligible standby power loss and minimal impact on high-impedance nodes |
| Response Time | <1 ns - limits voltage overshoot by initiating conduction before transient peaks |
| ESD Rating | Class 3 (>16 kV HBM) - withstands human-body model electrostatic discharge events |
| UL Recognition | UL 497B (File E210057) - certified for use in isolated loop communication and control circuits |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Dimensions: 4.06–4.60 mm (E), 3.30–3.95 mm (D), 1.95–2.47 mm (A), 0.76–1.60 mm (L). Mounting position: any.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-side reference; completes surge current path through PCB trace or plane |
| Cathode | High-voltage input terminal | Connected to protected line (e.g., 24 V rail); polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power rating | Handles ISO 7637-2 Pulse 5a (load dump) transients in 12 V/24 V automotive systems without degradation |
| UL 497B recognition | Validated for use in safety-critical isolated loop circuits including RS-485 fieldbus and PLC analog I/O modules |
| Sub-1 ns response time | Minimizes voltage overshoot during fast-rising EFT/burst events (IEC 61000-4-4) when placed adjacent to IC inputs |
| AEC-Q101 qualified (SZ prefix variant) | Meets stress test requirements for automotive electronics including temperature cycling and humidity bias life |
| Pb-free and RoHS compliant | Enables compliance with EU RoHS Directive 2011/65/EU and facilitates lead-free reflow soldering at 260°C for 10 s |
Applications
| Automotive Power Input Protection | Industrial 24 V DC Power Rail |
|---|---|
Use Scenario: Protecting engine control unit (ECU) 24 V input against load-dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role: Unidirectional TVS diode placed between battery rail and input filter capacitor. Use Value: Clamps 120 V/300 ms transients to ≤53.9 V, preventing damage to upstream DC-DC controller and downstream microcontroller power domains. |
Use Scenario: Safeguarding programmable logic controller (PLC) digital I/O module power input from switching noise and inductive kickback. IC Role / Device Role: Primary overvoltage clamp on 24 V backplane distribution rail. Use Value: Limits voltage excursions to below 55 V during relay coil de-energization, ensuring sustained operation of 3.3 V/5 V logic supervisors and isolators. |
| Medical Equipment Power Supply | Telecom Line Card Surge Protection |
Use Scenario: Shielding patient-connected diagnostic equipment power entry from mains-borne surges and ESD coupling. IC Role / Device Role: Secondary transient suppressor after primary MOV, located near AC/DC converter input. Use Value: Provides precise 33.3 V VRWM blocking and 53.9 V clamping to protect low-leakage bridge rectifier and X-cap discharge circuitry. |
Use Scenario: Protecting Ethernet PHY interface power pins (e.g., 3.3 V bias rail) from lightning-induced surges on PoE-enabled line cards. IC Role / Device Role: Localized TVS on board-level 3.3 V supply net feeding magnetics and PHY IC. Use Value: Delivers 11.2 A IPP capacity and <5 µA IR to maintain signal integrity while meeting GR-1089-CORE Level 3 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | 400 W peak power, 33 V VRWM, 53.3 V VC @ 7.5 A IPP, SMA package (smaller footprint, lower thermal mass) | Lower surge handling; suitable for consumer-grade 12 V systems but not automotive load-dump | Select when board space is constrained and surge energy is limited to IEC 61000-4-5 Level 3 (0.5 kV) |
| 1.5SMC39A | 1500 W peak power, 33.2 V VRWM, 60.0 V VC @ 25 A IPP, SMC package (larger, higher thermal capacity) | Higher clamping voltage and larger footprint; better for high-reliability 24 V industrial drives | Select when protecting high-current motor drivers where 60 V clamping is acceptable and 1500 W margin is required |
Compared with P6SMB39AT3, SMAJ33A offers space savings at reduced surge robustness, while 1.5SMC39A trades PCB area for significantly higher energy absorption-making P6SMB39AT3 the balanced choice for cost-sensitive automotive and industrial 24 V applications requiring UL 497B certification and 600 W capability in SMB form factor.
Availability
P6SMB39AT3 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, medical diagnostic power supplies, and telecom line card designs requiring stable component supply and long-term lifecycle support.
Supply support for P6SMB39AT3 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 P6SMB39AT3 belongs to ON Semiconductor's P6SMBxxAT3G series of 600 W unidirectional TVS diodes, engineered for robust transient suppression in harsh environments including automotive power systems and industrial control cabinets.
FAQ
What is the working peak reverse voltage (VRWM) of the P6SMB39AT3?
The P6SMB39AT3 has a working peak reverse voltage (VRWM) of 33.3 V. This value defines the maximum continuous DC or peak AC voltage the device can block in normal operation without entering breakdown. It is selected to be slightly below the 39.05 V nominal Zener breakdown voltage (VBR) to ensure reliable standoff while allowing sufficient margin above typical 24 V system operating voltages. Engineers must verify that VRWM exceeds the highest expected steady-state voltage on the protected line.
How does the P6SMB39AT3 compare to bidirectional TVS diodes like P6SMB39CAT3?
The P6SMB39AT3 is unidirectional and optimized for DC power rail protection where polarity is fixed, offering tighter VBR tolerance and lower leakage than its bidirectional counterpart P6SMB39CAT3. Unlike P6SMB39CAT3-which clamps both positive and negative transients-the P6SMB39AT3 only conducts in reverse bias, making it unsuitable for AC signal lines but ideal for 24 V automotive supplies where forward conduction must be avoided. Its 33.3 V VRWM is identical, but clamping behavior differs under negative transients.
What is the maximum clamping voltage (VC) of the P6SMB39AT3 and at what current is it specified?
The P6SMB39AT3 has a maximum clamping voltage (VC) of 53.9 V, measured at a peak pulse current (IPP) of 11.2 A using the standard 10/1000 µs waveform. This VC value represents the worst-case voltage imposed on the protected circuit during a surge event and must remain below the absolute maximum voltage rating of downstream components. The low 53.9 V clamping-combined with 600 W peak power-enables effective protection of 3.3 V, 5 V, and 24 V logic and power stages without overstressing sensitive ICs.
Is the P6SMB39AT3 RoHS compliant and lead-free?
Yes, the P6SMB39AT3 is Pb-free and fully RoHS compliant per Directive 2011/65/EU. It uses ON Semiconductor's SURMETIC® package with lead-free terminations compatible with standard SnAgCu reflow profiles. The device supports soldering at 260°C for 10 seconds, aligning with IPC-J-STD-020 moisture sensitivity level (MSL) 1 requirements. This compliance ensures environmental safety and facilitates manufacturing in modern lead-free assembly lines without requiring special process adjustments.
Does the P6SMB39AT3 have UL recognition, and for which standard?
Yes, the P6SMB39AT3 carries UL recognition under UL 497B (File E210057) for protectors in isolated loop circuits. This certification validates performance in tests including strike voltage breakdown, endurance conditioning, dielectric voltage-withstand, and discharge testing-going beyond basic flammability ratings. UL 497B recognition confirms suitability for safety-critical applications such as industrial fieldbus interfaces (RS-485, CAN), medical isolation barriers, and telecom line cards where regulatory compliance is mandatory.
P6SMB39AT3 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:
- -
P6SMB39AT3 FAQ
1.How can I place an order for P6SMB39AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB39AT3 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 P6SMB39AT3 reliable?
The price and inventory of P6SMB39AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB39AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB39AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB39AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB39AT3?
P6SMB39AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB39AT3 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 P6SMB39AT3?
For technical support, including P6SMB39AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB39AT3 requirements.
6.How does Aetrix verify that P6SMB39AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB39AT3 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 P6SMB39AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB39AT3?
All P6SMB39AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB39AT3, 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 P6SMB39AT3 part is unused and in its original packaging.
Return procedure for P6SMB39AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB39AT3 Tags
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