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onsemi P6SMB51CAT3
- Part No.:
- P6SMB51CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB51CAT3.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,947
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Product details
Overview
P6SMB51CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 43.6 V working peak reverse voltage (VRWM), 51.05 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps transients to ≤70.1 V at 8.6 A peak pulse current - enabling robust surge suppression in power supply rails and I/O interfaces.
For engineers reviewing the P6SMB51CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its UL 497B certification for isolated loop protection, <1 ns response time, low leakage (<5 µA @ 43.6 V), and SMB (DO-214AA) surface-mount package compatibility with high-reliability industrial and automotive designs.
Technical Context
The P6SMB51CAT3 operates as a bidirectional avalanche diode, leveraging silicon junction physics to clamp both positive and negative transients symmetrically around ground. Its 600 W peak pulse power rating (10/1000 µs waveform) and 40 °C/W junction-to-lead thermal resistance support sustained surge handling without thermal runaway under defined PCB layout conditions.
It exhibits a temperature coefficient of 0.102 %/°C for VBR and typical junction capacitance of 205 pF at 0 V bias (1 MHz), making it suitable for DC-biased signal lines where capacitive loading must remain predictable. The device is Pb-free, RoHS-compliant, and rated for operation from −65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W (10/1000 µs waveform); enables single-device protection against IEC 61000-4-5 Level 4 surges on 24 V systems |
| Working Peak Reverse Voltage (VRWM) | 43.6 V; maximum continuous DC or peak AC voltage the device blocks before clamping begins |
| Zener Breakdown Voltage (VBR) | 51.05 V @ 1 mA; precise threshold for avalanche conduction under transient stress |
| Clamping Voltage (VC) | 70.1 V @ 8.6 A IPP; maximum voltage seen by protected circuit during worst-case surge |
| Junction Capacitance (CJ) | 205 pF @ 0 V, 1 MHz; limits use in >5 MHz signal paths but acceptable for power rails and low-speed I/O |
| Leakage Current (IR) | <5 µA @ 43.6 V; ensures minimal standby power loss and no interference with high-impedance sensing nodes |
| Response Time | <1 ns; fast enough to suppress ESD and lightning-induced transients before downstream IC damage occurs |
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. Polarity band not marked; bidirectional operation eliminates anode/cathode orientation concerns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Transient conduction path | Both terminals conduct identically during positive or negative overvoltage events; no polarity-sensitive placement required |
| Case / Body | Thermal and mechanical interface | Transfer-molded thermoset plastic provides corrosion resistance and 260°C solderability; leads accept standard reflow profiles |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection - meets safety requirements for telecom and industrial interfaces where galvanic isolation is mandated |
| ESD Rating Class 3 (>16 kV HBM) | Withstands human-body-model discharges without degradation, eliminating need for supplemental ESD diodes in front-end protection stages |
| Low Clamping Ratio (VC/VBR = 1.37) | Minimizes overvoltage stress on downstream components - critical for protecting 48 V-rated MOSFETs and microcontrollers with 70 V absolute max ratings |
| Void-Free Surmetic® Mold | Ensures consistent thermal performance and long-term reliability in high-humidity or thermal-cycling environments (e.g., automotive engine compartments) |
| Lead Finish: Matte Tin (Pb-Free) | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 moisture sensitivity level (MSL 1) |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary parallel TVS for rail clamping; placed directly at connector entry point before bulk capacitor. Use Value: Limits transient voltage to ≤70.1 V, preventing latch-up or gate oxide rupture in upstream DC-DC controllers rated for 75 V max input. |
Use Scenario: LIN bus transceiver pins in BCM subjected to battery disconnect spikes and ESD events. IC Role / Device Role / Timing Role: Bidirectional line protector; shunts energy away from transceiver ESD structures during ±8 kV contact discharge. Use Value: Sub-1 ns response ensures clamping initiates before transceiver internal diodes conduct, preserving signal integrity and reducing bit errors. |
| Medical Equipment Isolated Sensor Interface | Telecom DSL Line Card Surge Protection |
|
Use Scenario: 5 V analog sensor supply rail in patient-monitoring device requiring UL 497B compliance for isolated loops. IC Role / Device Role / Timing Role: Secondary protection after primary isolation barrier; guards against secondary-side coupling transients. Use Value: UL 497B recognition validates safe operation in medically certified systems where failure modes must be rigorously controlled. |
Use Scenario: Tip/ring lines of ADSL2+ line card exposed to lightning-induced surges per ITU-T K.20/21. IC Role / Device Role / Timing Role: First-stage coarse protection; absorbs bulk surge energy before gas discharge tube (GDT) and precision TVS stages. Use Value: 600 W rating handles 10/1000 µs surges up to 100 A, extending GDT lifetime and reducing maintenance frequency in central office equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Same SMB package, identical VRWM (43.6 V) and VC (70.1 V), but lower 600 W rating tested per JEDEC JESD22-A114 (vs. ON Semi's proprietary 10/1000 µs curve) | Approved for MIL-STD-883H Class B screening; preferred in aerospace avionics where qualification traceability is mandatory | Select SMBJ51CA when full military-grade qualification documentation and lot traceability are contractually required. |
| 1.5SMC51CA | Higher 1500 W peak power rating, same VBR (51 V), but larger SMC (DO-214AB) package (7.11 × 6.22 mm vs. SMB's 4.6 × 3.95 mm) | Used where board space permits larger footprint and higher surge margin is needed for 48 V telecom rectifiers | Choose 1.5SMC51CA only if PCB layout allows SMC footprint and system-level surge testing exceeds 600 W requirements. |
Compared with SMBJ51CA and 1.5SMC51CA, the P6SMB51CAT3 delivers optimal balance of compact SMB packaging, UL 497B certification, and proven 600 W surge capability - making it the preferred choice for space-constrained industrial and medical designs requiring safety-agency validation.
Availability
P6SMB51CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical isolated sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for P6SMB51CAT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The P6SMB51CAT3 belongs to the P6SMBxxCAT3 series - a family of bidirectional 600 W TVS diodes engineered for cost-effective, high-reliability overvoltage protection in harsh-environment applications where UL recognition and thermal robustness are critical.
FAQ
What is the clamping voltage of the P6SMB51CAT3 at its rated peak pulse current?
The P6SMB51CAT3 has a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak pulse current (IPP) of 8.6 A, measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events. The P6SMB51CAT3 maintains this clamping performance without degradation under repeated non-repetitive surges.
Is the P6SMB51CAT3 suitable for bidirectional signal line protection?
Yes, the P6SMB51CAT3 is explicitly designed as a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients relative to ground. Its construction enables identical breakdown behavior in either polarity, making it appropriate for protecting AC-coupled data lines, LIN bus, RS-485, and other balanced or floating interfaces where polarity reversal may occur. The P6SMB51CAT3 does not require orientation during placement.
Does the P6SMB51CAT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire P6SMB11CAT3 series - including the P6SMB51CAT3 - carries Underwriters Laboratories recognition under UL 497B (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 - validating its use in safety-critical telecom and industrial isolation barriers where regulatory compliance is mandatory.
What is the thermal resistance and maximum operating temperature of the P6SMB51CAT3?
The P6SMB51CAT3 has a junction-to-lead thermal resistance (RJL) of 40 °C/W and is rated for continuous operation from −65 °C to +150 °C. Its DC power dissipation is 3.0 W at lead temperature (TL) of 75 °C, derating linearly above that point. These thermal characteristics assume mounting on a 1″ square copper pad on FR-4 board, per ON Semiconductor's recommended footprint in Case 403A outline specifications.
How does the P6SMB51CAT3 compare to unidirectional TVS diodes like P6SMB51AT3?
The P6SMB51CAT3 is bidirectional, while the P6SMB51AT3 is unidirectional - meaning the latter only clamps positive transients and requires correct anode/cathode orientation. The P6SMB51CAT3 offers symmetric protection without polarity constraints, simplifying layout and eliminating risk of reverse installation. Both share identical VRWM (43.6 V), VBR (51.05 V), and VC (70.1 V), but the P6SMB51CAT3 is preferred for AC or floating circuits, whereas P6SMB51AT3 suits DC-rail-only applications with defined ground reference.
P6SMB51CAT3 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 205pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB51CAT3 FAQ
1.How can I place an order for P6SMB51CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB51CAT3 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 P6SMB51CAT3 reliable?
The price and inventory of P6SMB51CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB51CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB51CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB51CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB51CAT3?
P6SMB51CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB51CAT3 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 P6SMB51CAT3?
For technical support, including P6SMB51CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB51CAT3 requirements.
6.How does Aetrix verify that P6SMB51CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB51CAT3 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 P6SMB51CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB51CAT3?
All P6SMB51CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB51CAT3, 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 P6SMB51CAT3 part is unused and in its original packaging.
Return procedure for P6SMB51CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB51CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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