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onsemi P6SMB12CAT3
- Part No.:
- P6SMB12CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
P6SMB12CAT3.pdf
- Description:
- TVS ZENER BIDIRECT 600W 12V SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,280
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Product details
Overview
P6SMB12CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 10.2 V working peak reverse voltage (VRWM), 12 V nominal Zener breakdown voltage (VBR), and clamps to 16.7 V at 36 A peak pulse current - deployed across power supply inputs, automotive ECUs, and industrial I/O interfaces.
For engineers reviewing the P6SMB12CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, 1 ns typical response time, UL 497B recognition for isolated loop protection, and SMB package thermal performance under repetitive surge conditions.
Technical Context
The P6SMB12CAT3 operates as a bidirectional avalanche diode with symmetrical clamping behavior on both polarities, enabling robust protection of AC-coupled or floating signal lines without polarity concerns. Its low zener impedance and fast <1 ns response ensure minimal overshoot during sub-microsecond transients.
Thermal design relies on junction-to-lead resistance of 25 °C/W and 3.0 W DC power dissipation at 75 °C lead temperature, requiring PCB copper pad thermal management per CASE 403A footprint. It meets AEC-Q101 for automotive use and Class 3 HBM ESD (>16 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms - sustains single high-energy surges without failure in telecom or automotive load-dump events |
| Working Peak Reverse Voltage (VRWM) | 10.2 V - sets minimum system operating voltage threshold before clamping activates |
| Breakdown Voltage (VBR) @ IT = 1 mA | 11.4 V (min) to 12.6 V (max) - defines precise avalanche onset range for predictable protection margin |
| Clamping Voltage (VC) @ IPP = 36 A | 16.7 V - maximum voltage seen by protected circuit during full-rated surge current |
| Junction Capacitance (Cj) | 800 pF @ 0 V, 1 MHz - impacts high-frequency signal integrity in data line protection |
| Leakage Current (IR) | <5 µA @ 10.2 V - ensures negligible standby power loss in battery-powered systems |
| Response Time | <1 ns - limits voltage overshoot before clamping engages during fast-rising transients |
Pinout & Package
Package: SMB (CASE 403A), surface-mount, Pb-free, void-free thermosetting plastic body with modified L-bend leads for enhanced solder joint reliability. Dimensions: 4.32 mm × 2.30 mm × 1.02 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Avalanche conduction terminal (bidirectional) | Functions as common connection point for symmetrical clamping; no polarity marking required per spec |
| Anode | Avalanche conduction terminal (bidirectional) | Completes bidirectional path; terminals are electrically interchangeable in layout |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection - enables compliance in industrial safety-critical designs without additional certification effort |
| AEC-Q101 Qualified | Qualified for automotive applications including engine control modules and body electronics - supports PPAP documentation requirements |
| ESD Rating: Class 3 HBM | >16 kV human-body-model immunity - protects against handling and assembly-level electrostatic discharge |
| Low Clamping Ratio (VC/VBR) | 1.47 (16.7 V / 11.4 V min) - provides tight overvoltage margin relative to breakdown, reducing risk of downstream component stress |
| SURMETIC® Package Reliability | Void-free molding and corrosion-resistant finish - ensures long-term moisture resistance and solder joint integrity in harsh environments |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting 12 V power rail inputs in engine control units (ECUs) against ISO 7637-2 load dump pulses and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy before reaching DC/DC converters and microcontrollers. Use Value: 16.7 V clamping voltage stays below 18 V absolute maximum rating of most automotive-grade regulators, preventing latch-up or damage. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring transients and ground bounce. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across input optocoupler terminals to limit voltage excursion during cable ESD events. Use Value: 1 ns response time and 800 pF capacitance avoid signal distortion on 10 kHz–100 kHz discrete input signals while maintaining noise immunity. |
| Medical Equipment Power Supply Inputs | Telecom Line Interface Protection |
|
Use Scenario: Shielding auxiliary 5 V/12 V rails in diagnostic imaging devices from coupling noise and external surge injection via shared AC mains. IC Role / Device Role / Timing Role: Primary-stage TVS on secondary-side DC outputs of medical-grade isolated SMPS to meet IEC 60601-1 creepage/clearance and surge immunity requirements. Use Value: UL 497B recognition confirms suitability for patient-connected equipment isolation barriers, reducing certification burden. |
Use Scenario: Front-end protection of Ethernet PHY or RS-485 transceivers connected to unshielded outdoor cabling exposed to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between connector and transceiver IC to absorb common-mode surges without disrupting differential signaling. Use Value: Symmetrical 10.2 V VRWM allows direct placement on AC-coupled lines; 600 W rating handles 10/1000 µs waveform per IEC 61000-4-5 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | Same SMB package, identical VRWM (10.2 V) and VC (16.7 V), but rated for 600 W with tighter VBR tolerance (11.4–12.6 V vs. 11.4–12.6 V); RoHS-compliant but not AEC-Q101 qualified | Lacks automotive qualification and UL 497B recognition - suitable for commercial/industrial use only | Select SMBJ12CA when AEC-Q101 and UL certification are not required and cost optimization is prioritized |
| 1.5KE12CA | Higher-power through-hole alternative (1500 W), same 12 V breakdown, but larger DO-201 package (7.11 mm × 5.59 mm) and slower thermal response due to higher RJA | Requires PCB real estate and through-hole assembly - incompatible with high-density SMT layouts | Choose 1.5KE12CA only when surge energy exceeds 600 W capability and board space/layout constraints permit through-hole mounting |
Compared with SMBJ12CA and 1.5KE12CA, the P6SMB12CAT3 uniquely combines AEC-Q101 qualification, UL 497B recognition, and SMB footprint - making it the preferred choice for automotive and safety-certified industrial designs where regulatory compliance and miniaturization are mandatory.
Availability
P6SMB12CAT3 is available at Aetrix Electronics and suitable for automotive ECU power inputs, industrial PLC I/O modules, and medical power supply secondary-side protection requiring stable component supply across multi-year production cycles.
Supply support for P6SMB12CAT3 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 connectivity solutions for automotive, industrial, and cloud power applications.
The P6SMB12CAT3 belongs to ON Semiconductor's P6SMBxxCAT3G series of 600 W SMB-packaged TVS diodes, engineered specifically for high-reliability transient suppression in space-constrained, safety-critical systems.
FAQ
What is the clamping voltage of the P6SMB12CAT3 at its rated peak pulse current?
The P6SMB12CAT3 clamps to a maximum of 16.7 V at its rated peak pulse current of 36 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across temperature and process variation per the ON Semiconductor datasheet, ensuring consistent overvoltage protection for downstream components in the P6SMB12CAT3-protected circuit.
Is the P6SMB12CAT3 suitable for automotive applications?
Yes, the P6SMB12CAT3 is AEC-Q101 qualified and PPAP capable, meeting the stress-test requirements for automotive electronic control units. Its bidirectional operation, 600 W surge rating, and UL 497B recognition make the P6SMB12CAT3 appropriate for protecting 12 V power nets in engine bays, infotainment systems, and ADAS sensors.
Does the P6SMB12CAT3 have polarity markings on the package?
No, the P6SMB12CAT3 is a bidirectional TVS diode and does not require polarity identification; the datasheet explicitly states "Polarity Band Will Not be Indicated." Both terminals function identically, allowing flexible PCB layout without orientation constraints - a key advantage of the P6SMB12CAT3 in symmetric protection schemes.
What is the maximum junction-to-ambient thermal resistance (RJA) for the P6SMB12CAT3?
The P6SMB12CAT3 has a maximum junction-to-ambient thermal resistance of 226 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint. This value assumes no additional copper pour; adding thermal pads or vias reduces effective RJA, which is critical for sustained surge duty cycles in the P6SMB12CAT3 design.
How does the P6SMB12CAT3 differ from unidirectional TVS diodes like P6SMB12AT3?
The P6SMB12CAT3 is bidirectional and clamps symmetrically on both polarities, whereas the unidirectional P6SMB12AT3 only clamps in reverse bias and conducts freely in forward bias. This makes the P6SMB12CAT3 ideal for AC signal lines or floating buses, while the P6SMB12AT3 suits DC power rails where forward conduction is acceptable - a functional distinction central to correct P6SMB12CAT3 application selection.
P6SMB12CAT3 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:
- -
P6SMB12CAT3 FAQ
1.How can I place an order for P6SMB12CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB12CAT3 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 P6SMB12CAT3 reliable?
The price and inventory of P6SMB12CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB12CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB12CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB12CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB12CAT3?
P6SMB12CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB12CAT3 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 P6SMB12CAT3?
For technical support, including P6SMB12CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB12CAT3 requirements.
6.How does Aetrix verify that P6SMB12CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB12CAT3 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 P6SMB12CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB12CAT3?
All P6SMB12CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB12CAT3, 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 P6SMB12CAT3 part is unused and in its original packaging.
Return procedure for P6SMB12CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB12CAT3 Tags
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