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onsemi P6SMB20CAT3
- Part No.:
- P6SMB20CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB20CAT3.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,839
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Product details
Overview
P6SMB20CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 17.1 V working peak reverse voltage (VRWM), 20 V nominal breakdown voltage (VBR) at 1 mA test current, and clamps transients to ≤27.7 V at 22 A peak pulse current - used in power supply input stages, automotive ECUs, and industrial I/O interfaces.
For engineers reviewing the P6SMB20CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected circuit's absolute maximum rating, surge current capability under 10/1000 µs waveform, UL 497B recognition for isolated loop protection, and SMB (DO-214AA) package compatibility with high-density PCB layouts.
Technical Context
The P6SMB20CAT3 operates as a bidirectional avalanche diode, symmetrically clamping positive and negative transients above its breakdown threshold. Its <1 ns response time and low zener impedance enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges without signal distortion.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal derating starting at 75°C junction temperature. The device uses ON Semiconductor's Surmetic™ molded plastic package (Case 403A), optimized for solderability and mechanical reliability in automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17.1 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's DC or peak AC operating voltage. |
| VBR @ IT=1 mA | 20 V (min 19 V, max 21 V) - Precise avalanche onset point; defines turn-on threshold under standardized test conditions. |
| VC @ IPP=22 A | 27.7 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream components. |
| IPP | 22 A - Peak pulse current supported at VRWM-derived clamping level; correlates directly with surge energy handling (600 W). |
| IR @ VRWM | <5 µA - Reverse leakage at working voltage; ensures negligible standby power loss and no false triggering. |
| Junction Capacitance | 490 pF @ 0 V - Affects high-frequency signal integrity; suitable for DC/low-speed lines but not RF or high-speed data buses. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for isolated loop circuit protection; validates dielectric strength, endurance, and flammability compliance. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, void-free thermosetting plastic case (Case 403A). Dimensions: 4.32 mm × 3.56 mm × 2.13 mm (L × W × H); lead finish is Pb-free; polarity band not marked (bidirectional symmetry).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode side marking) | Transient conduction path (bidirectional) | Both terminals function identically; no polarity dependency - connects across protected line and return (e.g., VBUS/GND or differential pair). |
| Anode (Cathode side marking) | Transient conduction path (bidirectional) | Electrically identical to cathode terminal; enables symmetrical clamping of ± transients without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential signals, or ungrounded systems without polarity concerns. |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) with margin when placed upstream of local filtering. |
| UL 497B certification | Validates suitability for telecom and industrial isolated loop applications where safety agency approval is mandatory. |
| <1 ns response time | Minimizes voltage overshoot during fast transients (e.g., ESD, relay bounce), reducing risk of IC latch-up or gate oxide damage. |
| Low leakage (<5 µA) | Prevents loading of high-impedance sensor outputs or reference nodes while maintaining tight clamping accuracy. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Parallel-connected transient clamp absorbing surge energy before it reaches DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤27.7 V during 22 A surges, preventing overvoltage shutdown or permanent damage to 36 V-rated input stages. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in BCMs exposed to battery voltage spikes and ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and ground to clamp both positive and negative transients without polarity biasing. Use Value: Maintains signal integrity under ISO 10605 ESD (±15 kV contact) while adding only 490 pF capacitance - within LIN bus timing budget. |
| Medical Equipment Isolated Sensor Interface | Point-of-Sale Terminal Power Entry |
Use Scenario: Protecting isolated analog front-ends (e.g., patient monitoring ECG leads) connected via optocoupled or transformer-isolated paths. IC Role / Device Role / Timing Role: UL 497B–certified TVS installed on secondary-side power and signal lines to meet medical safety isolation requirements. Use Value: Provides certified surge immunity up to 600 W without compromising creepage/clearance distances required for 2×MOPP isolation. | Use Scenario: Hardening 12 V DC input of retail POS terminals against accidental AC mains misconnection and nearby lightning-induced surges. IC Role / Device Role / Timing Role: First-line defense mounted at board edge, clamping transients before they reach internal LDOs and payment interface ICs. Use Value: Delivers 22 A surge current capacity and 27.7 V clamping to keep downstream 15 V-rated regulators within safe SOA limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Same SMB package, 20 V VBR, but lower 400 W peak power (vs. 600 W); higher clamping voltage (32.4 V @ 12.3 A). | Less margin for high-energy surges; unsuitable for IEC 61000-4-5 Level 4 without additional staging. | Select P6SMB20CAT3 when 600 W surge handling and UL 497B certification are required. |
| 1.5SMC20CA | Higher-power SMC package (1500 W), same 20 V VBR, but larger footprint (7.11 mm × 6.22 mm) and incompatible with SMB land patterns. | Requires PCB redesign; used where space permits and higher surge robustness is needed beyond 600 W. | Choose P6SMB20CAT3 for space-constrained designs needing certified 600 W protection in SMB form factor. |
Compared with SMAJ20CA and 1.5SMC20CA, the P6SMB20CAT3 uniquely balances 600 W surge capability, UL 497B recognition, and SMB footprint - making it optimal for industrial and automotive modules where certification, power density, and layout compatibility are jointly critical.
Availability
P6SMB20CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, and medical sensor interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P6SMB20CAT3 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 onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The P6SMB20CAT3 belongs to the P6SMBxxCAT3 series of bidirectional TVS diodes engineered for robust, certified overvoltage protection in harsh environments - emphasizing high surge capability, fast response, and regulatory compliance.
FAQ
What is the clamping voltage of the P6SMB20CAT3 at its rated peak pulse current?
The P6SMB20CAT3 clamps to a maximum of 27.7 V at its rated peak pulse current of 22 A (10/1000 µs waveform). This value is specified in the Electrical Characteristics table and represents the upper limit of voltage seen by protected circuitry during a full-rated surge event. Designers must ensure this clamping voltage remains below the absolute maximum ratings of downstream components. The P6SMB20CAT3 achieves this with low dynamic impedance and symmetric bidirectional structure.
Is the P6SMB20CAT3 RoHS-compliant and halogen-free?
Yes, the P6SMB20CAT3 is RoHS-compliant and offered in a Pb-free package, indicated by the "G" suffix in part numbers like P6SMB20CAT3G. ON Semiconductor confirms compliance with JEDEC JS709 and IPC-1752 standards for halogen content. The device uses environmentally compliant molding compound and lead finish, meeting industrial and automotive environmental requirements without sacrificing surge performance or thermal reliability.
Does the P6SMB20CAT3 require polarity-aware PCB layout?
No, the P6SMB20CAT3 does not require polarity-aware PCB layout because it is a bidirectional TVS diode. Its symmetrical construction allows mounting in either orientation across protected lines (e.g., between VBUS and GND or across differential pairs). The datasheet explicitly states "Polarity Band Will Not be Indicated", confirming that both terminals are functionally identical. This simplifies assembly and eliminates orientation-related field failures in high-volume manufacturing.
What is the thermal resistance junction-to-lead (RJL) for the P6SMB20CAT3?
The thermal resistance junction-to-lead (RJL) for the P6SMB20CAT3 is 40 °C/W, measured under standard conditions (1″ square copper pad on FR-4 board). This parameter governs heat transfer from the silicon die to the PCB copper, directly impacting power derating above 75°C ambient. At 75°C, the device supports 3.0 W DC dissipation, decreasing linearly at 25 mW/°C above that temperature. Proper pad design per ON Semiconductor's 403A footprint is essential to achieve this spec.
How does the P6SMB20CAT3 differ from unidirectional TVS diodes like P6SMB20AT3?
The P6SMB20CAT3 is bidirectional, while P6SMB20AT3 is unidirectional. The "C" suffix denotes bidirectional operation - meaning it clamps both positive and negative transients symmetrically, ideal for AC lines or floating signals. In contrast, P6SMB20AT3 functions as a single-polarity clamp (anode-to-cathode forward conduction only) and requires correct orientation. Their VBR and VRWM values differ accordingly: P6SMB20CAT3 has VRWM = 17.1 V and VBR = 20 V, whereas P6SMB20AT3 has VRWM = 17.1 V but VBR = 22.2 V (min) due to different test configuration.
P6SMB20CAT3 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 490pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB20CAT3 FAQ
1.How can I place an order for P6SMB20CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB20CAT3 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 P6SMB20CAT3 reliable?
The price and inventory of P6SMB20CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB20CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB20CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB20CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB20CAT3?
P6SMB20CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB20CAT3 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 P6SMB20CAT3?
For technical support, including P6SMB20CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB20CAT3 requirements.
6.How does Aetrix verify that P6SMB20CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB20CAT3 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 P6SMB20CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB20CAT3?
All P6SMB20CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB20CAT3, 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 P6SMB20CAT3 part is unused and in its original packaging.
Return procedure for P6SMB20CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB20CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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D5V0H1B2LP-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
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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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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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