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onsemi P6SMB30CAT3
- Part No.:
- P6SMB30CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB30CAT3.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
P6SMB30CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 25.6 V working peak reverse voltage (VRWM), 30 V nominal Zener breakdown voltage (VBR), clamps to ≤41.4 V at 14.4 A peak pulse current (IPP), and responds in <1 ns - deployed in automotive power supplies, industrial I/O interfaces, and medical equipment surge protection circuits.
For engineers reviewing the P6SMB30CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, peak pulse current capability under 10/1000 µs waveform, UL 497B certification for isolated loop protection, and SMB (DO-214AA) package compatibility with high-density PCB layouts.
Technical Context
The P6SMB30CAT3 operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients above its breakdown threshold. Its low zener impedance and fast response enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges without latch-up or thermal runaway.
It is rated for 600 W non-repetitive peak power at 1 ms pulse width (10/1000 µs waveform), with thermal derating to 0.55 W at TA = 25°C and junction-to-ambient thermal resistance of 226 °C/W. The device is Pb-free, RoHS-compliant, and housed in ON Semiconductor's Surmetic™ SMB package (Case 403A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 25.6 V - maximum continuous reverse voltage before clamping begins; must exceed circuit's peak operating voltage |
| VBR @ IT=1 A | 28.5–31.5 V - guaranteed breakdown range ensures reliable turn-on within system tolerance bands |
| VC @ IPP=14.4 A | ≤41.4 V - clamping voltage limits protected IC stress during 10/1000 µs surge events |
| IPP | 14.4 A - peak pulse current capacity defines maximum energy absorption per transient |
| Leakage @ VRWM | <5 µA - negligible standby power loss in always-on protection circuits |
| Response Time | <1 ns - enables suppression before sensitive downstream logic or analog stages are overstressed |
| Capacitance @ 0 V | 335 pF - low enough for DC/low-speed signal line protection without bandwidth degradation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, void-free thermosetting plastic case (Case 403A); polarity band not indicated - bidirectional operation requires no orientation-dependent placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient conduction path (bidirectional) | Both terminals function identically; connects across protected node and ground/rail without polarity constraint |
| Anode (Cathode) | Transient conduction path (bidirectional) | Identical to opposite terminal; enables symmetrical clamping of ± transients on same node |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in compact SMB footprint |
| UL 497B recognition (QVGQ2) | Validated for isolated loop circuit protection - meets safety requirements for telecom and industrial fieldbus interfaces |
| ESD rating >16 kV HBM | Eliminates need for additional ESD diodes in front-end ports handling human contact (e.g., USB, RS-485 connectors) |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage margin between clamp level and IC absolute maximum ratings - critical for 3.3 V/5 V logic protection |
| Pb-free Surmetic™ package | Enables lead-free reflow assembly while maintaining mechanical reliability and solderability per J-STD-020 |
Applications
| Automotive Power Distribution | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp ±100 V spikes. Use Value: Withstands 600 W surges and maintains VRWM ≥25.6 V - avoids false triggering during normal 14 V nominal operation. | Use Scenario: Shielding 4–20 mA current loop inputs from induced surges in factory floor wiring. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across input terminals to limit voltage excursion during lightning coupling. Use Value: UL 497B certification ensures compliance for isolated loop protection; 41.4 V clamping prevents op-amp input stage damage. |
| Medical Equipment Power Rails | Telecom Interface Protection |
Use Scenario: Safeguarding internal 24 V DC/DC converter outputs in diagnostic imaging systems. IC Role / Device Role / Timing Role: Rail-to-rail TVS on secondary-side output to absorb switching noise and external EFT bursts. Use Value: <1 ns response time prevents overshoot propagation into sensitive analog sensor subsystems; low leakage preserves regulation accuracy. | Use Scenario: Front-end protection for RS-485 transceivers in building automation networks. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (A/B) and ground to suppress common-mode surges. Use Value: 335 pF capacitance avoids signal integrity issues at 10 Mbps; symmetric clamping handles both polarities of induced transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA | Same SMB package, identical VRWM (25.6 V) and VC (41.4 V), but rated for 600 W with tighter VBR tolerance (28.5–30.0 V vs. 28.5–31.5 V) | Preferred where tighter breakdown consistency is required for margin-critical 3.3 V/5 V rail protection | Select SMBJ30CA if design requires tighter VBR distribution; P6SMB30CAT3 offers broader availability and lower cost in high-volume tape-and-reel |
| 1.5SMC30CA | Larger SMC (DO-214AB) package, same electrical specs but higher thermal mass (RJA = 150 °C/W vs. 226 °C/W) and 1500 W peak power rating | Better suited for high-temperature ambient environments (>85 °C) or repetitive surge duty cycles | Choose 1.5SMC30CA only when board space allows larger footprint and thermal performance outweighs size constraints |
Compared with SMBJ30CA and 1.5SMC30CA, the P6SMB30CAT3 delivers optimal balance of compact SMB packaging, UL 497B certification, and cost-effective 600 W surge handling - making it ideal for space-constrained, safety-certified industrial and automotive modules where precise VBR tolerance is secondary to supply chain stability.
Availability
P6SMB30CAT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and medical power supply designs requiring stable component supply and full traceability.
Supply support for P6SMB30CAT3 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 power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud power applications.
The P6SMB30CAT3 belongs to the P6SMBxxCAT3 series - a family of bidirectional 600 W TVS diodes engineered for robust, certified overvoltage protection in harsh electromagnetic environments.
FAQ
What is the clamping voltage of the P6SMB30CAT3 at its rated peak pulse current?
The P6SMB30CAT3 clamps to a maximum of 41.4 V at its specified peak pulse current of 14.4 A (10/1000 µs waveform). This value is guaranteed across temperature and process variation per ON Semiconductor's datasheet Figure 2 and Electrical Characteristics table. Designers use this VC rating to verify that downstream components remain below their absolute maximum voltage ratings during surge events. The P6SMB30CAT3 achieves this with low dynamic impedance and symmetric bidirectional structure.
Is the P6SMB30CAT3 unidirectional or bidirectional, and how does that affect PCB layout?
The P6SMB30CAT3 is a bidirectional TVS diode, meaning it clamps both positive and negative transients equally - no cathode/anode orientation is required during placement. Unlike unidirectional devices, it has no polarity marking on the SMB package (per datasheet note: "Polarity Band Will Not be Indicated"). This simplifies PCB layout by eliminating orientation checks and enabling flexible routing in differential or AC-coupled paths. The P6SMB30CAT3 is therefore ideal for protecting balanced interfaces like RS-485 or AC power inputs where polarity reversal may occur.
Does the P6SMB30CAT3 meet UL 497B certification, and what does that mean for my design?
Yes, the P6SMB30CAT3 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 - going beyond basic flammability compliance. For your design, UL 497B means the P6SMB30CAT3 can be used in safety-critical telecom, industrial fieldbus, and medical isolation barriers without requiring additional third-party validation. The P6SMB30CAT3 is one of few TVS families with full-series UL recognition.
What is the thermal derating behavior of the P6SMB30CAT3 above 25°C ambient temperature?
The P6SMB30CAT3 has a junction-to-ambient thermal resistance (RJA) of 226 °C/W and a DC power dissipation rating of 0.55 W at TA = 25°C, derating linearly at 4.4 mW/°C above that temperature. At 75°C ambient, its usable DC power drops to 0.33 W. However, its 600 W peak pulse rating applies only at TL = 25°C with 1 ms pulse width and is not directly derated by ambient alone - system-level thermal design must ensure heatsinking or spacing prevents sustained junction temperatures exceeding +150°C. The P6SMB30CAT3 datasheet provides full derating curves in Figure 3.
How does the P6SMB30CAT3 compare to the P6SMB30A variant?
The P6SMB30CAT3 is the bidirectional version, whereas P6SMB30A is unidirectional - confirmed by ON Semiconductor's ordering nomenclature ("C" suffix = bidirectional, no "C" = unidirectional) and the series datasheet's explicit separation of "P6SMBxxCAT3" and "P6SMBxxAT3" families. Electrically, the P6SMB30A has identical VRWM (25.6 V), VBR (28.5–31.5 V), and VC (41.4 V), but conducts only in reverse bias. The P6SMB30CAT3 must be selected when protection against both polarities is required, such as in AC lines or floating signal pairs; using P6SMB30A in those cases would leave half the transient spectrum unprotected.
P6SMB30CAT3 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 335pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB30CAT3 FAQ
1.How can I place an order for P6SMB30CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB30CAT3 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 P6SMB30CAT3 reliable?
The price and inventory of P6SMB30CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB30CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB30CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB30CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB30CAT3?
P6SMB30CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB30CAT3 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 P6SMB30CAT3?
For technical support, including P6SMB30CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB30CAT3 requirements.
6.How does Aetrix verify that P6SMB30CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB30CAT3 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 P6SMB30CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB30CAT3?
All P6SMB30CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB30CAT3, 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 P6SMB30CAT3 part is unused and in its original packaging.
Return procedure for P6SMB30CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB30CAT3 Tags
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