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onsemi P6SMB91CAT3
- Part No.:
- P6SMB91CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB91CAT3.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
P6SMB91CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 77.8 V working peak reverse voltage (VRWM), 91 V breakdown voltage (VBR) at 1 mA test current, and clamps to 125 V at 4.8 A peak pulse current - enabling robust surge suppression in power supply inputs and industrial I/O interfaces.
For engineers reviewing the P6SMB91CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, 1 ns typical response time, UL 497B recognition for isolated loop protection, and SMB (DO-214AA) surface-mount compatibility with standard PCB footprints.
Technical Context
The P6SMB91CAT3 operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown to clamp transients symmetrically across both polarities. Its design targets single-pulse 600 W surges per 10/1000 µs waveform, with thermal resistance of 226 °C/W (junction-to-ambient) and 40 °C/W (junction-to-lead), requiring careful PCB copper area management for sustained duty cycles.
It exhibits low leakage (<5 µA at VRWM), 120 pF junction capacitance at 0 V bias, and a temperature coefficient of 0.106 %/°C for VBR - making it suitable for DC-biased signal lines where capacitive loading and thermal drift must be constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms, 10/1000 µs waveform - defines maximum single-event surge energy handling |
| Working Peak Reverse Voltage | 77.8 V - minimum continuous operating voltage before leakage exceeds 5 µA |
| Breakdown Voltage | 91 V @ 1 mA IT - guaranteed avalanche onset threshold under DC test conditions |
| Clamping Voltage | 125 V @ 4.8 A IPP - maximum voltage seen by protected circuit during rated surge |
| Junction Capacitance | 120 pF @ 0 V, 1 MHz - limits high-frequency signal integrity impact on data lines |
| Response Time | <1 ns - ensures clamping activation before transient propagates into downstream ICs |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct human-contact interface protection |
Pinout & Package
Package: SMB (DO-214AA), surface-mount plastic case with modified L-bend leads; dimensions per Case 403A-03 (L = 4.06–4.60 mm, D = 3.30–3.95 mm, E = 4.06–4.60 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band End | Anode (for negative polarity surge) | Bidirectional operation: no fixed anode/cathode; band denotes terminal 1 per DO-214AA orientation |
| Opposite End | Cathode (for positive polarity surge) | Same physical terminal functions as cathode during positive transients; symmetrical conduction |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - enables compliance in telecom and industrial safety-critical designs without additional certification effort |
| Pb-Free Surmetic Package | RoHS-compliant thermosetting plastic housing with corrosion-resistant, solderable leads - supports lead-free reflow (260°C/10 s) |
| Low Clamping Ratio | VC/VBR = 125/91 ≈ 1.37 - tight voltage margin preserves headroom for downstream 100 V-rated components |
| Negligible Inductance Layout | Optimized internal structure and L-bend leads - minimizes overshoot in fast-rising transients when mounted close to protected node |
Applications
| Industrial PLC I/O Protection | AC/DC Power Supply Input |
|---|---|
Use Scenario: Protecting 24 VDC digital input modules against induced lightning surges on factory floor wiring. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly across input terminals, absorbing >600 W transients before they reach optocoupler or MCU GPIO. Use Value: Prevents false triggering and latch-up in PLC controllers by limiting transient voltage to ≤125 V while maintaining <5 µA leakage at 24 V nominal. | Use Scenario: Safeguarding primary-side rectifier and bulk capacitor in offline SMPS against line surges and load dump events. IC Role / Device Role / Timing Role: Parallel-connected TVS across AC input or DC bus, clamping 10/1000 µs surges within 1 ns to protect bridge rectifier and controller IC. Use Value: Enables use of lower-voltage-rated MOSFETs and capacitors by holding peak stress to 125 V despite 1 kV+ line transients. |
| Automotive Body Control Module | Medical Equipment Signal Isolation |
Use Scenario: Shielding LIN bus transceivers and sensor inputs in BCMs from battery load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS on each LIN line, referenced to ground, providing symmetrical clamping for ±100 V transients. Use Value: Meets automotive EMC requirements with 125 V clamping and Class 3 ESD rating, eliminating need for external series impedance. | Use Scenario: Protecting isolated analog front-ends (e.g., ECG electrode inputs) connected to patient-facing circuits. IC Role / Device Role / Timing Role: UL 497B-recognized TVS on secondary side of isolation barrier, suppressing coupling transients without compromising creepage/clearance. Use Value: Supports regulatory approval for medical devices by meeting stringent isolation loop protection standards with verified dielectric withstand and endurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | Same SMB package; 90 V VBR, 123 V VC @ 4.9 A; 600 W rating; identical thermal specs | Marginally lower clamping (123 V vs. 125 V); same VRWM (77.8 V) and leakage | Select when tighter clamping voltage is prioritized and 1 V reduction is acceptable in system margin |
| 1.5SMC91CA | Higher-power 1500 W variant in larger SMC (DO-214AB) package; same 91 V VBR, 125 V VC | Requires larger PCB footprint and different thermal layout; suited for higher-repetition surges | Choose for applications needing extended surge endurance beyond single 600 W events, accepting larger board area |
Compared with SMBJ90CA and 1.5SMC91CA, the P6SMB91CAT3 delivers optimal balance of compact SMB footprint, UL 497B certification, and precise 91 V/125 V voltage coordination - making it preferred for space-constrained industrial and medical designs requiring safety-agency validation.
Availability
P6SMB91CAT3 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, AC/DC power supply input staging, and automotive body control module surge hardening requiring stable component supply and full traceability.
Supply support for P6SMB91CAT3 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 manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The P6SMB91CAT3 belongs to the P6SMBxxCAT3 series - a family of 600 W bidirectional TVS diodes engineered for cost-effective, UL-recognized overvoltage protection in harsh electrical environments.
FAQ
What is the clamping voltage of the P6SMB91CAT3 and how is it measured?
The P6SMB91CAT3 has a maximum clamping voltage (VC) of 125 V, measured at a peak pulse current (IPP) of 4.8 A using the standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage the device allows across its terminals during a 600 W transient event, ensuring downstream components remain within safe operating limits. The P6SMB91CAT3 achieves this clamping performance consistently due to its optimized Zener avalanche structure and low dynamic impedance.
Is the P6SMB91CAT3 RoHS compliant and what does the "T3" suffix indicate?
Yes, the P6SMB91CAT3 is RoHS compliant and Pb-free, as confirmed by the "G" suffix in its full ordering code (P6SMB91CAT3G). The "T3" suffix specifically denotes packaging on a 13-inch tape-and-reel carrier, with 2500 units per reel - a standard configuration for automated SMT assembly. The device uses ON Semiconductor's Surmetic molded plastic package, qualified for lead-free reflow up to 260°C for 10 seconds.
How does the P6SMB91CAT3 differ from unidirectional TVS diodes like P6SMB91AT3?
The P6SMB91CAT3 is bidirectional, meaning it provides symmetrical clamping for both positive and negative voltage transients, with identical 91 V breakdown and 125 V clamping characteristics in either polarity. In contrast, the unidirectional P6SMB91AT3 functions only as a reverse-biased Zener and requires correct polarity installation; it offers no protection against positive surges on its anode. This makes the P6SMB91CAT3 ideal for AC-coupled or floating signal lines where polarity is undefined.
What is the thermal resistance and power derating behavior of the P6SMB91CAT3?
The P6SMB91CAT3 has a junction-to-ambient thermal resistance (RJA) of 226 °C/W and junction-to-lead resistance (RJL) of 40 °C/W. Its DC power dissipation is rated at 0.55 W at 25°C ambient, derating linearly by 4.4 mW/°C above that temperature. For pulsed operation, average power must be reduced per the derating curve in Figure 3 of the datasheet - critical for applications with repetitive surges or elevated ambient temperatures near 125°C.
Does the P6SMB91CAT3 meet any safety certifications relevant for industrial equipment?
Yes, the P6SMB91CAT3 carries UL 497B recognition (File #E210057, category QVGQ2) for isolated loop circuit protection - a key requirement for industrial communication interfaces, programmable logic controllers, and process control systems. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - exceeding basic flammability-only approvals held by many competing TVS diodes.
P6SMB91CAT3 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):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 120pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB91CAT3 FAQ
1.How can I place an order for P6SMB91CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB91CAT3 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 P6SMB91CAT3 reliable?
The price and inventory of P6SMB91CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB91CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB91CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB91CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB91CAT3?
P6SMB91CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB91CAT3 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 P6SMB91CAT3?
For technical support, including P6SMB91CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB91CAT3 requirements.
6.How does Aetrix verify that P6SMB91CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB91CAT3 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 P6SMB91CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB91CAT3?
All P6SMB91CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB91CAT3, 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 P6SMB91CAT3 part is unused and in its original packaging.
Return procedure for P6SMB91CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB91CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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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
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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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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