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onsemi P6SMB33CAT3
- Part No.:
- P6SMB33CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB33CAT3.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,090
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Product details
Overview
P6SMB33CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 28.2 V working peak reverse voltage (VRWM), 33 V nominal breakdown voltage (VBR), and clamps transients to ≤45.7 V at 13.2 A peak pulse current (IPP), making it suitable for automotive power line surge suppression and industrial I/O port protection.
For engineers reviewing the P6SMB33CAT3 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 circuits, and SMB (DO-214AA) package compatibility with high-density PCB layouts.
Technical Context
The P6SMB33CAT3 operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown in both polarities to clamp voltage spikes symmetrically. Its <1 ns response time and low zener impedance ensure rapid suppression of ESD and lightning-induced surges without relying on external triggering circuitry.
It is rated for 600 W non-repetitive peak power at TL = 25°C with 1 ms pulse width, and derates linearly above 75°C junction-to-lead (RJL = 40 °C/W). Thermal design must account for its 226 °C/W junction-to-ambient resistance on FR-4 board with minimum footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28.2 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC bus or signal swing. |
| VBR @ IT=1 mA | 33.05 V (min) to 34.7 V (max) - Confirmed Zener breakdown range ensures predictable turn-on threshold across temperature. |
| VC @ IPP=13.2 A | 45.7 V - Clamped voltage during 10/1000 µs surge; defines maximum stress seen by protected IC or connector. |
| IPP | 13.2 A - Peak pulse current capability at 1 ms; determines survivability against IEC 61000-4-5 Level 4 surges. |
| IR @ VRWM | <5 µA - Low leakage preserves signal integrity in high-impedance sensor or communication lines. |
| Junction Capacitance | 305 pF @ 0 V - Measured at 1 MHz; impacts high-frequency signal integrity in data lines >10 MHz. |
| ESD Rating | Class 3 (>16 kV HBM) - Validated per ANSI/ESDA/JEDEC JS-001; qualifies for direct I/O port protection. |
Pinout & Package
Surface-mount SMB (DO-214AA) package with void-free thermosetting plastic case, modified L-bend leads for enhanced solder joint reliability, and polarity band omitted per bidirectional design. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked End) | Anode/Cathode Terminal | Bidirectional operation means either terminal serves as anode or cathode depending on transient polarity; no fixed polarity assignment. |
| Anode (Unmarked End) | Anode/Cathode Terminal | Electrically identical to marked end; terminals are interchangeable in layout; no directional routing required. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGQ2) | Validated for isolated loop circuit protection including strike voltage, endurance, and discharge testing - enables compliance-ready industrial designs. |
| Surmetic® Package | ON Semiconductor's proprietary transfer-molded plastic offering superior moisture resistance and thermal cycling reliability vs. standard SMB. |
| Low Clamping Ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage margin between breakdown and clamping, reducing risk of downstream component overstress during surge events. |
| Lead-Free (Pb-Free) Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile; compatible with standard SnPb and lead-free assembly processes. |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Suppresses load dump and alternator ripple transients on 24 V vehicle battery rails feeding ECUs and infotainment systems. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly across power input pins upstream of DC-DC converters. Use Value: Limits transient voltage to ≤45.7 V, preventing damage to 36 V-rated input stages while surviving 600 W pulses per ISO 7637-2 Pulse 5a. | Use Scenario: Protects 24 V digital input modules in programmable logic controllers from field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Parallel-connected TVS at terminal block entry point, before optocoupler isolation barrier. Use Value: Clamps fast-rising transients (<1 ns response) before they couple into isolation barrier, preserving signal integrity and long-term optocoupler life. |
| Medical Equipment Signal Lines | Telecom Interface Ports |
Use Scenario: Shields analog sensor inputs (e.g., ECG, pressure transducers) from ESD and coupling noise in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) bidirectional clamp on differential sensor traces near ADC front-end. Use Value: Prevents input stage saturation during 15 kV contact ESD events without introducing DC offset or signal attenuation. | Use Scenario: Safeguards RS-485 transceivers in networked building automation systems exposed to lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Common-mode TVS across A/B lines and shield, referenced to local ground plane. Use Value: Absorbs common-mode surges up to 600 W while maintaining signal fidelity via matched capacitance (305 pF) on both 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, 600 W rating, but VRWM = 28.2 V and VC = 45.7 V identical; differs in thermal resistance (RJA = 226 °C/W same) and UL recognition (not UL 497B listed). | Lacks UL 497B certification; unsuitable for safety-critical isolated loop protection in medical or telecom infrastructure. | Select P6SMB33CAT3 when UL 497B compliance or Surmetic® package reliability is required. |
| 1.5SMC33CA | Higher 1500 W rating, DO-214AB (SMC) package (larger footprint), VRWM = 28.2 V, VC = 45.7 V, but RJA = 110 °C/W - lower thermal efficiency on same PCB area. | Requires larger PCB real estate and different stencil design; better for higher-energy surges where space permits. | Choose 1.5SMC33CA only if surge energy exceeds 600 W and layout allows SMC footprint. |
Compared with SMBJ33CA and 1.5SMC33CA, the P6SMB33CAT3 uniquely combines UL 497B recognition, Surmetic® package robustness, and SMB footprint density - making it optimal for space-constrained, safety-certified industrial and automotive applications where consistent 600 W surge handling is sufficient.
Availability
P6SMB33CAT3 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O modules, medical sensor interfaces, and telecom RS-485 ports requiring stable component supply and full traceability.
Supply support for P6SMB33CAT3 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 power management, analog, sensors, and discrete components for automotive, industrial, and cloud power applications.
The P6SMB33CAT3 belongs to the P6SMBxxCAT3 series - a family of bidirectional 600 W TVS diodes engineered for cost-effective, high-reliability surge protection in harsh environments where UL 497B certification and compact SMB packaging are critical.
FAQ
What is the clamping voltage of the P6SMB33CAT3 at its rated peak pulse current?
The P6SMB33CAT3 clamps to a maximum of 45.7 V at its rated peak pulse current of 13.2 A, measured under the standard 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and ensures protected circuitry remains below safe voltage thresholds during transient events. The P6SMB33CAT3 datasheet specifies this as VC @ IPP in the Electrical Characteristics table.
Is the P6SMB33CAT3 certified for UL 497B, and what does that mean for my design?
Yes, the P6SMB33CAT3 carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - enabling compliance in medical, telecom, and industrial safety-critical systems without additional third-party validation. The P6SMB33CAT3 meets requirements where generic TVS diodes do not.
Does the P6SMB33CAT3 have polarity markings, and how should it be oriented on the PCB?
No, the P6SMB33CAT3 is a bidirectional TVS diode and has no polarity marking - the "polity band will not be indicated" per the official datasheet. Either end may connect to positive or negative rails; orientation is irrelevant in layout. This simplifies placement and eliminates risk of reverse installation during assembly. The P6SMB33CAT3 functions identically regardless of mounting direction.
What is the maximum operating temperature range for the P6SMB33CAT3?
The P6SMB33CAT3 supports an operating and storage temperature range of −65 °C to +150 °C. Its junction-to-lead thermal resistance is 40 °C/W, and it derates linearly above 75 °C ambient - maintaining full 600 W surge capability only up to TL = 25 °C. At 125 °C ambient, the P6SMB33CAT3 retains ~40% of its peak power rating, per Figure 3 in the datasheet.
Can the P6SMB33CAT3 replace unidirectional TVS diodes like P6SMB33AT3 in existing designs?
No - the P6SMB33CAT3 is strictly bidirectional and cannot substitute for unidirectional parts such as P6SMB33AT3 in DC-biased applications. Unidirectional TVS diodes conduct only in reverse bias and block forward current; using the P6SMB33CAT3 in their place may cause unintended conduction during normal operation. Always verify circuit topology: the P6SMB33CAT3 is intended for AC-coupled or floating signal lines, not DC power rails with defined polarity.
P6SMB33CAT3 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 305pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB33CAT3 FAQ
1.How can I place an order for P6SMB33CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB33CAT3 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 P6SMB33CAT3 reliable?
The price and inventory of P6SMB33CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB33CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB33CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB33CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB33CAT3?
P6SMB33CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB33CAT3 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 P6SMB33CAT3?
For technical support, including P6SMB33CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB33CAT3 requirements.
6.How does Aetrix verify that P6SMB33CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB33CAT3 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 P6SMB33CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB33CAT3?
All P6SMB33CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB33CAT3, 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 P6SMB33CAT3 part is unused and in its original packaging.
Return procedure for P6SMB33CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB33CAT3 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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