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onsemi P6SMB56CAT3
- Part No.:
- P6SMB56CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB56CAT3.pdf
- Description:
- TVS DIODE 47.8VWM 77VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,346
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Product details
Overview
P6SMB56CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 47.8 V working peak reverse voltage (VRWM), 56 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps transients to ≤77 V at 7.8 A peak pulse current - enabling robust surge protection in DC power rails and interface lines.
For engineers reviewing the P6SMB56CAT3 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 protection, and SMB (DO-214AA) surface-mount compatibility with standard PCB footprints.
Technical Context
The P6SMB56CAT3 operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients above its breakdown threshold. Its low zener impedance and sub-1 ns response time ensure rapid voltage limiting without significant overshoot when placed close to protected circuitry.
It is rated for 600 W non-repetitive peak pulse power per 10/1000 µs waveform, with thermal derating applied above 75°C junction temperature. The device meets UL 497B for isolated loop circuit protection and carries Class 3 ESD rating (>16 kV HBM), confirming suitability for industrial and automotive interface protection where reliability under surge stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms, 10/1000 µs waveform - sustains single high-energy surges common in automotive load dump or lightning-induced coupling. |
| Working Peak Reverse Voltage (VRWM) | 47.8 V - maximum continuous DC or peak AC voltage the device blocks before entering avalanche conduction. |
| Zener Breakdown Voltage (VBR) | 56 V ±5% @ 1 mA - precise threshold at which clamping initiates; ensures predictable protection onset across temperature. |
| Clamping Voltage (VC) | 77 V @ 7.8 A IPP - maximum voltage seen by protected circuit during worst-case surge; defines safety margin vs. IC absolute max ratings. |
| Junction Capacitance (Cj) | 185 pF @ 0 V, 1 MHz - low enough to avoid signal integrity degradation on <10 Mbps data lines or DC power inputs. |
| Leakage Current (IR) | <5 µA @ 47.8 V - negligible standby power loss and minimal impact on high-impedance bias networks. |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for system-level ESD immunity in end-equipment design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount plastic case with modified L-bend leads; dimensions per ON Semiconductor Case 403A-03 (L = 4.06–4.60 mm, W = 3.30–3.95 mm, H = 2.159–2.45 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Common terminal for bidirectional operation | No polarity marking required; symmetrical structure allows either lead to serve as anode/cathode depending on transient polarity. |
| Anode | Common terminal for bidirectional operation | Identical electrical behavior to cathode; terminals are interchangeable in layout - no orientation dependency in PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| UL 497B recognition | Validated for use in isolated loop circuits (e.g., 4–20 mA sensor interfaces), reducing certification effort in industrial systems. |
| Sub-1 ns response time | Minimizes voltage overshoot during fast transients (e.g., EFT bursts), preserving integrity of downstream logic and analog circuitry. |
| Surmetic® package | Void-free thermoset molding ensures long-term mechanical stability and moisture resistance in harsh environments. |
| Pb-free (RoHS-compliant) | Meets global environmental regulations; compatible with standard SnPb and lead-free reflow profiles (260°C/10 s max). |
Applications
| Industrial Sensor Interface | Automotive Power Rail Protection |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters and receivers from induced surges in factory automation wiring. IC Role / Device Role / Timing Role: Bidirectional TVS placed across loop terminals to clamp common-mode transients up to ±1 kV. Use Value: Maintains signal accuracy under IEC 61000-4-5 surge testing while meeting UL 497B isolation barrier requirements. | Use Scenario: Safeguarding infotainment head-unit power input against load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary clamping device on 12 V supply rail, absorbing up to 600 W for 1 ms without failure. Use Value: Limits rail voltage to ≤77 V, preventing damage to downstream DC/DC converters and microcontrollers rated to 60 V abs max. |
| Medical Equipment Port Protection | Telecom Line Interface |
Use Scenario: Shielding USB or RS-232 ports on diagnostic devices from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (185 pF) bidirectional TVS shunting transients directly at connector entry point. Use Value: Provides >16 kV HBM ESD immunity without distorting signal edges on low-speed serial links. | Use Scenario: Overvoltage protection on Ethernet PHY side of PoE-powered edge switches. IC Role / Device Role / Timing Role: Secondary surge limiter after primary gas discharge tube, handling residual energy with precise clamping. Use Value: Clamps induced surges to 77 V within 1 ns, ensuring compliance with IEEE 802.3af/bt surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ56CA | Same SMB package, identical VRWM (47.8 V), VBR (56 V), and VC (77 V); differs only in branding and minor process revision. | No functional difference; fully interchangeable in all designs using P6SMB56CAT3. | Select SMBJ56CA if sourcing from distributors carrying ON Semiconductor's SMBJ-series inventory with identical parametric performance. |
| 1.5SMC56CA | Higher power rating (1500 W), larger SMC (DO-214AB) package; same electrical specs but requires different PCB footprint. | Used where higher surge repetition or longer pulse duration (e.g., IEC 61000-4-5 combination wave) demands greater energy absorption. | Choose 1.5SMC56CA only when board space permits larger package and system-level testing confirms need for >600 W capability. |
Compared with SMBJ56CA, the P6SMB56CAT3 offers identical protection performance in the same SMB footprint; compared with 1.5SMC56CA, it trades lower surge capacity for compact size and lower parasitic inductance - making P6SMB56CAT3 optimal for space-constrained, high-frequency transient environments.
Availability
P6SMB56CAT3 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive power rail protection, medical equipment port hardening, and telecom line interface applications requiring stable component supply and full traceability.
Supply support for P6SMB56CAT3 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The P6SMB56CAT3 belongs to the P6SMBxxCAT3 series of 600 W bidirectional TVS diodes, engineered specifically for cost-sensitive, high-reliability overvoltage protection in DC power distribution and signal interface circuits.
FAQ
What is the clamping voltage of the P6SMB56CAT3 under maximum surge conditions?
The P6SMB56CAT3 clamps to a maximum of 77 V when subjected to its rated peak pulse current of 7.8 A (10/1000 µs waveform). This value is guaranteed across temperature and represents the highest voltage the protected circuit will experience during a worst-case transient event. The P6SMB56CAT3 achieves this with low dynamic impedance, ensuring consistent clamping performance in real-world surge scenarios.
Is the P6SMB56CAT3 suitable for bidirectional signal line protection?
Yes, the P6SMB56CAT3 is explicitly designed as a bidirectional TVS diode, with symmetrical avalanche characteristics that provide equal clamping for both positive and negative transients. Its DO-214AA (SMB) package has no polarity marking, and either terminal may serve as anode or cathode - making the P6SMB56CAT3 ideal for protecting AC-coupled, differential, or floating interfaces such as RS-485, CAN, or audio lines.
Does the P6SMB56CAT3 meet UL 497B certification for isolated loop protection?
Yes, the entire P6SMB11CAT3 series - including the P6SMB56CAT3 - holds UL 497B recognition (File #E210057, Category QVGQ2) for protectors used in isolated loop circuits. This certification validates performance in tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge - confirming the P6SMB56CAT3's suitability for safety-critical 4–20 mA industrial sensor systems.
What is the maximum operating temperature range for the P6SMB56CAT3?
The P6SMB56CAT3 is rated for an operating and storage temperature range of −65 °C to +150 °C. Its thermal resistance junction-to-lead is 40 °C/W, and it must be derated above 75 °C ambient or lead temperature to maintain safe power dissipation. This wide range supports deployment in under-hood automotive, outdoor industrial, and high-temperature medical equipment where the P6SMB56CAT3 remains stable and reliable.
How does the P6SMB56CAT3 compare to unidirectional TVS diodes like P6SMB56AT3?
The P6SMB56CAT3 is bidirectional, while the P6SMB56AT3 is unidirectional - meaning the latter only clamps positive transients and requires correct polarity installation. The P6SMB56CAT3 eliminates orientation concerns and protects both polarities inherently, making it preferred for AC signals, floating grounds, or designs where polarity cannot be guaranteed. Electrical parameters (VBR, VC, PPK) are otherwise matched between the two variants.
P6SMB56CAT3 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 185pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB56CAT3 FAQ
1.How can I place an order for P6SMB56CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB56CAT3 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 P6SMB56CAT3 reliable?
The price and inventory of P6SMB56CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB56CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB56CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB56CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB56CAT3?
P6SMB56CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB56CAT3 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 P6SMB56CAT3?
For technical support, including P6SMB56CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB56CAT3 requirements.
6.How does Aetrix verify that P6SMB56CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB56CAT3 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 P6SMB56CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB56CAT3?
All P6SMB56CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB56CAT3, 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 P6SMB56CAT3 part is unused and in its original packaging.
Return procedure for P6SMB56CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB56CAT3 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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Diodes Incorporated
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Diodes Incorporated
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