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onsemi P6SMB39CAT3
- Part No.:
- P6SMB39CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB39CAT3.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,706
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Product details
Overview
P6SMB39CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 33.3 V working peak reverse voltage (VRWM), 39.05 V nominal breakdown voltage (VBR) at 1 mA test current, and clamps transients to 53.9 V at 11.2 A peak pulse current - enabling robust surge immunity in industrial power supplies and automotive ECUs.
For engineers reviewing the P6SMB39CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, peak pulse current capability under 1 ms 10/1000 µs waveform, UL 497B recognition for isolated loop protection, and SMB (DO-214AA) surface-mount compatibility with standard PCB footprints.
Technical Context
The P6SMB39CAT3 operates as a bidirectional Zener-based TVS, symmetrically clamping positive and negative transients without polarity dependence. Its low zener impedance and sub-1 ns response time ensure fast voltage limiting during ESD or lightning-induced surges.
It is rated for 600 W non-repetitive peak power at 1 ms pulse width (10/1000 µs waveform), with thermal derating above 75°C junction temperature and validated performance across −65°C to +150°C operating range - supporting deployment in harsh-environment automotive and industrial control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms 10/1000 µs waveform - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage (VRWM) | 33.3 V - maximum continuous DC or peak AC voltage the device blocks before clamping |
| Breakdown Voltage (VBR) | 39.05 V min @ 1 mA - precise Zener conduction onset for predictable clamping threshold |
| Clamping Voltage (VC) | 53.9 V @ 11.2 A IPP - limits transient voltage seen by downstream circuitry |
| Leakage Current (IR) | <5 µA @ 33.3 V - negligible standby power loss and minimal loading on protected line |
| Junction Capacitance (Cj) | 260 pF @ 0 V, 1 MHz - low enough for <100 Mbps data lines but not RF or high-speed USB |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for system-level ESD immunity |
Pinout & Package
Package: SMB (DO-214AA), surface-mount plastic case per ON Semiconductor Case 403A. Dimensions: 4.06–4.60 mm length × 3.30–3.95 mm width × 1.90–2.45 mm height. Pb-free, RoHS-compliant, UL 497B recognized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Transient Conduction Terminal | Bidirectional operation: functions as cathode during positive transients and anode during negative transients - no fixed polarity |
| Anode | Transient Conduction Terminal | Completes symmetrical clamping path; both terminals are electrically identical in function under reverse/forward bias |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - meets full strike voltage, endurance, dielectric withstand, and discharge testing requirements |
| Surmetic® Package | Void-free, transfer-molded thermoset plastic - ensures mechanical reliability and moisture resistance in reflow-soldered assemblies |
| Low Clamping Ratio (VC/VBR) | 1.38 - tight voltage margin between breakdown and clamping improves system safety margin vs. IC absolute maximum ratings |
| Fast Response Time | <1 ns typical - minimizes overshoot before clamping engages, critical for protecting fast logic and analog inputs |
| Thermal Derating Support | 40 °C/W junction-to-lead thermal resistance - enables reliable power dissipation with standard 1″² copper pad on FR-4 PCB |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controller (PLC) power supply subjected to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly across input terminals to limit surge energy before it reaches DC-DC converters and microcontrollers. Use Value: 53.9 V clamping voltage ensures downstream 36 V-rated input capacitors and 40 V MOSFETs remain within safe operating area during ISO 7637-2 Pulse 5a events. | Use Scenario: CAN bus power line in BCM exposed to battery reversal and jump-start transients up to ±60 V. IC Role / Device Role / Timing Role: Bidirectional transient suppressor bridging VCC and GND to absorb both positive and negative polarity surges without polarity-sensitive placement. Use Value: Symmetrical clamping and UL 497B certification enable compliance with automotive OEM requirements for isolated communication subsystem protection. |
| Medical Equipment Input Stage | Telecom Line Interface Card |
Use Scenario: Mains-derived 48 V DC backup supply in patient monitor subjected to EFT/burst noise per IEC 61000-4-4. IC Role / Device Role / Timing Role: First-line transient suppressor on secondary-side DC bus, coordinated with upstream fuse and downstream TVS array. Use Value: 600 W peak power rating and low leakage (<5 µA) prevent false triggering while maintaining long-term reliability in safety-critical applications. | Use Scenario: -48 V telecom power feed line interfacing with Ethernet PHY and management MCU. IC Role / Device Role / Timing Role: High-energy surge protector on central office power input, placed before DC-DC isolation stage. Use Value: 33.3 V VRWM matches nominal -48 V system with sufficient margin; 260 pF capacitance avoids signal integrity degradation on 10/100BASE-TX lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same SMB package, 33 V VRWM, 53.3 V VC @ 11.3 A - slightly lower clamping voltage but tighter VRWM tolerance | Preferred where system operating voltage is tightly regulated near 30 V; less margin for voltage drift | Select when lower clamping voltage is prioritized over VRWM headroom |
| 1.5SMC33CA | Higher 1500 W peak power, same 33 V VRWM, but larger SMC (DO-214AB) package - 7.11 mm × 6.22 mm vs. SMB's 4.6 mm × 3.95 mm | Used where higher surge duty cycle or repeated transients demand greater thermal mass | Select only if board space allows larger footprint and thermal design supports higher power density |
Compared with SMBJ33CA and 1.5SMC33CA, the P6SMB39CAT3 offers optimal balance of 33.3 V VRWM headroom, 53.9 V clamping, and compact SMB packaging - making it ideal for space-constrained 24–36 V systems requiring UL 497B compliance without overspecifying power rating.
Availability
P6SMB39CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, medical equipment input stages, and telecom line interface cards requiring stable component supply and full traceability.
Supply support for P6SMB39CAT3 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 (now onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The P6SMB39CAT3 belongs to the P6SMBxxCAT3 series of 600 W bidirectional TVS diodes - engineered specifically for cost-effective, high-reliability overvoltage protection in surface-mount power and signal line applications.
FAQ
What is the clamping voltage of the P6SMB39CAT3 at its rated peak pulse current?
The P6SMB39CAT3 clamps to 53.9 V at its specified peak pulse current of 11.2 A, measured under the standard 10/1000 µs waveform. This value is guaranteed per the ON Semiconductor datasheet and defines the maximum voltage imposed on protected circuitry during a 600 W transient event. The P6SMB39CAT3 maintains this clamping performance across its full operating temperature range of −65°C to +150°C.
Is the P6SMB39CAT3 unidirectional or bidirectional, and how does that affect PCB layout?
The P6SMB39CAT3 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional devices, it has no designated anode or cathode for DC blocking - the marked band indicates terminal identity but not functional polarity. Therefore, PCB layout requires no orientation constraint, simplifying placement and reducing assembly errors in differential or AC-coupled protection schemes.
Does the P6SMB39CAT3 meet UL 497B certification, and what does that cover?
Yes, the P6SMB39CAT3 is UL 497B recognized (File #E210057, QVGQ2 category) for isolated loop circuit protection. This certification validates performance in multiple rigorous tests including strike voltage breakdown, endurance conditioning, temperature cycling, dielectric voltage-withstand, and discharge testing - confirming suitability for safety-critical telecom, industrial, and medical isolation barriers where regulatory compliance is mandatory.
What is the thermal resistance and derating behavior of the P6SMB39CAT3?
The P6SMB39CAT3 has a junction-to-lead thermal resistance (RJL) of 40 °C/W and is rated for 3.0 W DC power dissipation at 75°C lead temperature, derating linearly above that point. At ambient temperatures above 25°C, its junction-to-ambient thermal resistance (RJA) is 226 °C/W, limiting continuous power to 0.55 W unless enhanced with thermal pads or airflow. These values assume use of ON Semiconductor's recommended 1″² copper pad on FR-4 PCB per datasheet footnote 2.
Can the P6SMB39CAT3 be used in place of the P6SMB36CAT3 or P6SMB43CAT3?
The P6SMB39CAT3 is not a direct replacement for P6SMB36CAT3 (36 V VBR) or P6SMB43CAT3 (43 V VBR), as each has distinct breakdown and clamping voltages. Substitution requires verifying that the 39.05 V nominal VBR and 53.9 V clamping voltage align with the protected circuit's operating voltage margin and IC absolute maximum ratings. For example, replacing P6SMB36CAT3 with P6SMB39CAT3 increases clamping headroom but reduces transient response sensitivity - system-level validation is required.
P6SMB39CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 260pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB39CAT3 FAQ
1.How can I place an order for P6SMB39CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB39CAT3 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 P6SMB39CAT3 reliable?
The price and inventory of P6SMB39CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB39CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB39CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB39CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB39CAT3?
P6SMB39CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB39CAT3 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 P6SMB39CAT3?
For technical support, including P6SMB39CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB39CAT3 requirements.
6.How does Aetrix verify that P6SMB39CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB39CAT3 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 P6SMB39CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB39CAT3?
All P6SMB39CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB39CAT3, 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 P6SMB39CAT3 part is unused and in its original packaging.
Return procedure for P6SMB39CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB39CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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