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onsemi P6SMB43CAT3
- Part No.:
- P6SMB43CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
P6SMB43CAT3.pdf
- Description:
- TVS ZENER BIDIR 600W 43V SMB
- Quantity:
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Inventory:9,797
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Product details
Overview
P6SMB43CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 36.8 V working peak reverse voltage (VRWM), 43.05 V nominal breakdown voltage (VBR) at 1 mA test current, and clamps to ≤59.3 V at 10.1 A peak pulse current - enabling robust surge suppression in industrial power supplies and automotive ECUs.
For engineers reviewing the P6SMB43CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, VRWM alignment with steady-state bus voltage, IEC 61000-4-2/4-5 compliance readiness, and UL 497B recognition for isolated loop safety certification.
Technical Context
The P6SMB43CAT3 operates as a silicon avalanche diode in bidirectional Zener mode, triggered by reverse-biased avalanche breakdown above VRWM. Its sub-1 ns response time ensures suppression before downstream ICs experience overstress, while low zener impedance (<1 Ω typical) maintains tight clamping under high di/dt transients.
Thermal design relies on junction-to-lead resistance (RJL = 25 °C/W) and 600 W non-repetitive 1 ms pulse capability per Figure 2 waveform. Derating follows Figure 3: at 75°C lead temperature, DC power drops to 3.0 W; at 125°C ambient, peak pulse current falls to ~65% of rated value.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36.8 V - Maximum continuous reverse voltage before significant leakage; must exceed system's max operating voltage (e.g., 36 V nominal battery rail). |
| VBR @ IT=1 mA | 43.05 V (nominal) - Avalanche onset threshold; defines minimum clamping trigger point under low-current stress. |
| VC @ IPP=10.1 A | 59.3 V - Clamped voltage during 1 ms 10.1 A surge; must stay below protected device's absolute max rating (e.g., <60 V for 48 V system MCU). |
| IPP | 10.1 A - Peak pulse current at which VC is specified; correlates to IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge capability. |
| CJ @ 0 V, 1 MHz | 240 pF - Junction capacitance affecting high-frequency signal integrity; suitable for <10 Mbps data lines or DC power rails. |
| IR @ VRWM | 5 µA - Reverse leakage at working voltage; negligible power loss in standby, critical for low-power sensor nodes. |
| ESD HBM | Class 3 (>16 kV) - Withstands human-body-model ESD events without degradation; eliminates need for external ESD diodes in front-end interfaces. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, Pb-free, void-free thermosetting plastic. Dimensions: 4.32 mm × 2.30 mm × 2.20 mm (L × W × H); polarity band not marked (bidirectional symmetry).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional avalanche terminals | Identical electrical behavior in either orientation; connects across protected line and ground (or between differential lines) without polarity concern. |
| Case / Body | Non-conductive thermal path | Plastic case provides isolation; heat dissipation occurs via soldered leads to PCB copper; no heatsink pad required for 600 W pulses. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection - enables direct use in telecom/data line surge protectors without additional safety certification effort. |
| Response Time < 1 ns | Clamps transients before propagation into sensitive analog or digital circuitry - essential for protecting ADC inputs or CAN transceivers from EFT bursts. |
| AEC−Q101 Qualified (SZ prefix variant) | Validated for automotive underhood environments (−40°C to +125°C operation, vibration, thermal cycling); P6SMB43CAT3 shares same die/process as qualified SZ version. |
| Low Clamping Ratio (VC/VBR = 1.38) | Minimizes voltage overshoot margin needed - allows tighter design margins versus alternatives with VC/VBR > 1.5 (e.g., 65 V clamp for 43 V VBR). |
| 600 W Peak Pulse Power | Withstands IEC 61000-4-5 Combination Wave (1.2/50 µs voltage, 8/20 µs current) surges up to 4 kV on 2 Ω source impedance without failure. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24–48 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary overvoltage clamp placed across input bulk capacitor and ground. Use Value: Limits transient voltage to ≤59.3 V, preventing damage to 60 V-rated input MOSFETs and PWM controllers while maintaining UL 497B compliance. |
Use Scenario: LIN bus transceiver power rail in door module subjected to battery reversal and jump-start surges. IC Role / Device Role: Bidirectional rail clamp between VBAT and GND, absorbing reverse polarity energy and positive spikes. Use Value: Survives −14 V reverse and +100 V positive transients per ISO 7637-2 Pulse 5a/b, eliminating need for separate reverse-protection diode. |
| Medical Equipment ESD Shielding | Telecom Isolated Data Line |
|
Use Scenario: Front-panel USB port on patient monitor requiring IEC 61000-4-2 Level 4 (±8 kV contact) immunity. IC Role / Device Role: Secondary ESD clamp after common-mode choke, shunting HBM/CDM energy to chassis ground. Use Value: 16 kV HBM rating ensures no parametric shift or failure after repeated ESD events; 240 pF capacitance avoids USB 2.0 signal distortion. |
Use Scenario: RS-485 transceiver side of galvanically isolated interface in building automation controller. IC Role / Device Role: UL 497B-recognized protector on secondary-side signal lines, referenced to isolated ground plane. Use Value: Enables single-device compliance with UL 497B Strike Voltage Breakdown and Endurance Conditioning tests - reduces BOM count vs. multi-component solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Same VRWM (36.8 V), but lower peak power (400 W) and higher clamping voltage (63.0 V @ 6.4 A). | Limited to lower-energy surges (IEC 61000-4-5 Level 2); unsuitable for 48 V automotive load dump. | Select P6SMB43CAT3 when 600 W surge handling and UL 497B recognition are mandatory. |
| 1.5SMC43CA | Same electrical specs but larger SMC package (7.1 mm × 6.2 mm); 1.5 kW peak power rating. | Over-specified size/power for space-constrained designs; requires larger PCB footprint and higher assembly cost. | Choose P6SMB43CAT3 for optimal balance of 600 W capability, SMB footprint, and cost in volume production. |
Compared with SMAJ43A and 1.5SMC43CA, the P6SMB43CAT3 delivers certified 600 W surge immunity in the smallest standard surface-mount package with UL 497B listing - making it the preferred choice for space-limited industrial and automotive applications demanding proven safety compliance.
Availability
P6SMB43CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, medical diagnostic equipment, and telecom infrastructure requiring stable component supply and full regulatory documentation traceability.
Supply support for P6SMB43CAT3 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 cloud power applications.
The P6SMB43CAT3 belongs to ON Semiconductor's SMB-series transient voltage suppressors - engineered for high-reliability overvoltage protection in harsh environments where UL recognition, AEC−Q101 compatibility, and consistent clamping performance are critical.
FAQ
What is the maximum clamping voltage of the P6SMB43CAT3 under surge conditions?
The P6SMB43CAT3 clamps to a maximum of 59.3 V when subjected to its rated 10.1 A peak pulse current (1 ms waveform). This value is measured per the standard 10/1000 µs surge test condition defined in the datasheet and represents the upper limit of voltage seen by downstream components during a worst-case transient event. Designers must ensure this clamping voltage remains below the absolute maximum ratings of protected ICs.
Is the P6SMB43CAT3 suitable for automotive applications?
Yes - the P6SMB43CAT3 shares the same die and process as the AEC−Q101-qualified SZP6SMB43CAT3G variant. While the "P" prefix denotes standard industrial grade, its construction, thermal performance, and electrical parameters meet automotive requirements for under-hood modules operating from −40°C to +125°C. For PPAP-submission projects, the SZ-prefix version is recommended.
Does the P6SMB43CAT3 have polarity markings on the package?
No - the P6SMB43CAT3 is a bidirectional TVS diode and carries no polarity marking on its SMB package. The device functions identically regardless of orientation across the protected line and ground. This simplifies placement in automated assembly and eliminates risk of reverse installation in symmetric protection circuits.
How does the UL 497B recognition benefit system-level certification?
The P6SMB43CAT3 holds UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This pre-certification allows designers to claim compliance for surge protection subsystems without performing full UL repeat testing - significantly reducing time-to-market for medical, telecom, and industrial equipment requiring safety agency approval.
What is the junction capacitance of the P6SMB43CAT3 and how does it affect signal lines?
The P6SMB43CAT3 exhibits a typical junction capacitance of 240 pF at 0 V bias and 1 MHz. This value is low enough to avoid signal integrity issues on DC power rails and low-speed buses (e.g., LIN, I²C), but may attenuate edges on high-speed interfaces like USB 2.0 or Ethernet PHYs. For such applications, designers should verify eye diagram compliance or select lower-capacitance TVS variants.
P6SMB43CAT3 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:
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P6SMB43CAT3 FAQ
1.How can I place an order for P6SMB43CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB43CAT3 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 P6SMB43CAT3 reliable?
The price and inventory of P6SMB43CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB43CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB43CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB43CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB43CAT3?
P6SMB43CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB43CAT3 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 P6SMB43CAT3?
For technical support, including P6SMB43CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB43CAT3 requirements.
6.How does Aetrix verify that P6SMB43CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB43CAT3 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 P6SMB43CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB43CAT3?
All P6SMB43CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB43CAT3, 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 P6SMB43CAT3 part is unused and in its original packaging.
Return procedure for P6SMB43CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB43CAT3 Tags
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