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onsemi P6SMB33CAT3G
- Part No.:
- P6SMB33CAT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB33CAT3G.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:34,292
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Product details
Overview
P6SMB33CAT3G 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 28.2 V working peak reverse voltage (VRWM), 33.05 V nominal breakdown voltage (VBR) at 1 mA, clamps to 45.7 V at 13.2 A peak pulse current, and responds in <1 ns - used in automotive power supply input stages, industrial PLC I/O modules, and medical equipment surge protection.
For engineers reviewing the P6SMB33CAT3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SMB package mechanical data, UL 497B certification status, clamping performance under 10/1000 µs transients, and direct alternative part comparisons for robust ESD/surge design validation.
Technical Context
The P6SMB33CAT3G operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown to clamp transient voltages above its VRWM. Its low zener impedance and fast response (<1 ns) enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges per IEC 61000-4-2/5.
It is rated for 600 W non-repetitive peak pulse power (1 ms, 10/1000 µs waveform), with thermal derating starting at 75°C (junction-to-lead RJL = 40 °C/W) and full operation across −65°C to +150°C. The device uses ON Semiconductor's SURMETIC® SMB package with Pb-free terminations and modified L-bend leads for reliable soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms, 10/1000 µs waveform - supports IEC 61000-4-5 Level 4 (4 kV) surge immunity in AC/DC power inputs |
| Working Peak Reverse Voltage (VRWM) | 28.2 V - sets minimum operating voltage threshold before clamping begins; matches 24 V nominal systems |
| Breakdown Voltage (VBR) | 33.05 V @ 1 mA - defines precise avalanche onset; tight ±5% tolerance ensures predictable turn-on |
| Clamping Voltage (VC) | 45.7 V @ 13.2 A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Junction Capacitance (Cj) | 305 pF @ 0 V, 1 MHz - low enough for <10 Mbps CAN/RS-485 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 robustness |
| UL Recognition | UL 497B certified (File #E210057) - validated for isolated loop circuit protection in telecom and industrial interfaces |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic body with corrosion-resistant, solderable leads. Dimensions: 4.32 mm × 2.30 mm × 2.20 mm (L × W × H); polarity band not marked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode for negative transients) | Transient conduction path (bidirectional) | Both terminals conduct equally during positive or negative surges - no polarity marking required |
| Anode (Cathode for negative transients) | Transient conduction path (bidirectional) | Identical terminal behavior to cathode; symmetric clamping enables single-device protection of AC or floating rails |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity concerns |
| 600 W peak pulse rating | Supports sustained surge energy handling in 24 V automotive power distribution and industrial motor drive controls |
| UL 497B recognition | Validated for use in safety-critical isolated loop circuits including analog sensor transmitters and fieldbus interfaces |
| <1 ns response time | Minimizes voltage overshoot during fast transients (e.g., relay coil flyback, ESD), reducing risk of IC latch-up |
| Pb-free SURMETIC® package | Meets RoHS and J-STD-020 reflow profiles (260°C/10 s); modified L-bend leads improve pad adhesion on FR-4 PCBs |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protects 24 V supply rail of BCM against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Parallel-connected TVS diode clamping transient spikes before they reach MCU power regulators and CAN transceivers. Use Value: Clamps to 45.7 V at 13.2 A, staying below 50 V absolute max rating of typical 24 V-rated LDOs and microcontrollers. | Use Scenario: Shields 4–20 mA current loop inputs from induced surges in factory floor wiring. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input terminals of precision op-amp front-end. Use Value: 28.2 V VRWM allows normal 24 V loop bias while suppressing >1 kV transients per IEC 61000-4-5; UL 497B validates isolation integrity. |
| Medical Patient Monitor ECG Signal Path | Telecom DSL Line Interface Protection |
Use Scenario: Guards low-noise instrumentation amplifier inputs against ESD events during patient contact. IC Role / Device Role / Timing Role: Low-capacitance (305 pF) TVS placed at connector entry point to shunt HBM discharges before amplification stage. Use Value: Class 3 ESD rating (>16 kV) meets IEC 60601-1-2 requirements; bidirectional symmetry avoids signal inversion in differential ECG paths. | Use Scenario: Protects ADSL/VDSL line driver/receiver ICs from lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Primary surge suppression device mounted at RJ-11 jack, upstream of transformer and PHY IC. Use Value: 600 W rating handles 10/700 µs telecom surges; UL 497B certification confirms suitability for telephone line interface safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Unidirectional; 33 V VRWM; 500 W peak power; SMA package (smaller footprint, lower thermal mass) | Requires external polarity management; less suitable for AC or floating rails | Select when board space is constrained and circuit polarity is fixed (e.g., DC power rail only) |
| SMCJ33CA | Bidirectional; 33 V VRWM; 1500 W peak power; SMC package (larger, higher thermal capacity) | Higher surge margin for harsh environments (e.g., outdoor telecom cabinets) | Select when system-level surge testing exceeds IEC 61000-4-5 Level 4 or requires extended duty cycle capability |
Compared with SMAJ33A and SMCJ33CA, the P6SMB33CAT3G offers balanced 600 W surge handling in the compact SMB form factor, making it optimal for space-constrained 24 V industrial and automotive designs where bidirectional protection and UL 497B certification are mandatory.
Availability
P6SMB33CAT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for P6SMB33CAT3G 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 P6SMB33CAT3G belongs to ON Semiconductor's P6SMBxxCAT3G series of 600 W SMB-packaged TVS diodes, engineered for cost-effective, high-reliability surge protection in harsh-environment DC power and signal interfaces.
FAQ
What is the clamping voltage of the P6SMB33CAT3G at its rated peak pulse current?
The P6SMB33CAT3G clamps to 45.7 V at its specified peak pulse current of 13.2 A (10/1000 µs waveform). This value is measured under standardized test conditions per ON Semiconductor's datasheet and represents the maximum voltage imposed on the protected circuit during a worst-case surge event. Designers use this parameter to verify that downstream components remain within their absolute maximum voltage ratings during transient events.
Is the P6SMB33CAT3G suitable for protecting RS-485 communication lines?
Yes, the P6SMB33CAT3G is suitable for RS-485 line protection when used in conjunction with appropriate series impedance. Its 305 pF junction capacitance at 0 V is low enough to avoid significant signal degradation up to ~10 Mbps, and its 28.2 V VRWM aligns with common 24 V or ±12 V RS-485 bus configurations. However, designers must verify layout parasitics and ensure clamping does not exceed transceiver common-mode limits.
Does the P6SMB33CAT3G have AEC-Q101 qualification?
No, the P6SMB33CAT3G is not AEC-Q101 qualified. It belongs to the standard P6SMBxxCAT3G series. For automotive-grade applications requiring AEC-Q101 certification, the SZP6SMB33CAT3G variant - which shares identical electrical specifications but includes additional process controls and PPAP documentation - should be selected instead.
What is the thermal resistance from junction to ambient for the P6SMB33CAT3G?
The P6SMB33CAT3G has a junction-to-ambient thermal resistance (RJA) of 226 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint. This value assumes no thermal relief or copper pour; actual RJA improves significantly with added copper area. Derating begins at 25°C ambient, with usable power dropping to zero at 150°C.
Can the P6SMB33CAT3G replace the P6SMB33A in an existing design?
No - the P6SMB33CAT3G is bidirectional, whereas the P6SMB33A is unidirectional. Substituting them without circuit review risks incorrect clamping behavior on negative transients or reverse-bias conditions. If the original design relies on unidirectional suppression (e.g., DC rail only), the P6SMB33A or SMAJ33A remains appropriate; if bidirectional protection is needed, the P6SMB33CAT3G is correct but requires verification of layout symmetry and grounding.
P6SMB33CAT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- 305pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB33CAT3G FAQ
1.How can I place an order for P6SMB33CAT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB33CAT3G 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 P6SMB33CAT3G reliable?
The price and inventory of P6SMB33CAT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB33CAT3G is usually 5 days.
3.What payment methods are accepted for P6SMB33CAT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB33CAT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB33CAT3G?
P6SMB33CAT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB33CAT3G 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 P6SMB33CAT3G?
For technical support, including P6SMB33CAT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB33CAT3G requirements.
6.How does Aetrix verify that P6SMB33CAT3G is sourced from the original manufacturer or authorized distributors?
All P6SMB33CAT3G 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 P6SMB33CAT3G meets industry standards.
7.What is the process for return or replacement of P6SMB33CAT3G?
All P6SMB33CAT3G units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB33CAT3G, 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 P6SMB33CAT3G part is unused and in its original packaging.
Return procedure for P6SMB33CAT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB33CAT3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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