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onsemi P6SMB91AT3
- Part No.:
- P6SMB91AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
P6SMB91AT3.pdf
- Description:
- TVS ZENER UNIDIR 600W 91V SMB
- Quantity:
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Inventory:8,917
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Product details
Overview
P6SMB91AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 77.8 V working peak reverse voltage (VRWM), 91 V breakdown voltage (VBR) at 1 mA test current, 125 V maximum clamping voltage (VC) at 4.8 A peak pulse current (IPP), and sub-1 ns response time. It is used in automotive power supply inputs, industrial PLC I/O modules, and telecom line interface circuits to absorb ESD and lightning-induced surges.
For engineers reviewing the P6SMB91AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < protected IC's absolute maximum rating, IPP capability matching surge threat level, UL 497B certification for isolated loop safety, and SMB package thermal performance under repeated transients.
Technical Context
The P6SMB91AT3 operates as a silicon avalanche diode with sharp Zener-like breakdown above VRWM, entering low-impedance conduction within <1 ns when transient voltage exceeds VBR. Its clamping action diverts surge current away from downstream circuitry while holding voltage across the load at ≤125 V during a 1 ms 4.8 A pulse.
Thermal design relies on junction-to-lead resistance (RJL = 25 °C/W) and 75 °C derated DC power dissipation (3.0 W), requiring PCB copper area per Case 403A footprint. The device is rated for −65 °C to +150 °C operation and passes Class 3 HBM ESD (>16 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 77.8 V - Maximum continuous reverse voltage before significant leakage; must exceed system DC bus or signal swing. |
| VBR @ IT=1 mA | 91 V (min–max 86.5–95.5 V) - Precise avalanche onset threshold defining protection trigger point. |
| VC @ IPP=4.8 A | 125 V - Clamped voltage during worst-case 1 ms surge; determines maximum stress on downstream components. |
| PPK | 600 W @ 1 ms - Peak surge energy absorption capacity; defines survivability against IEC 61000-4-5 Level 4 threats. |
| IR @ VRWM | 5 µA max - Low leakage ensures minimal standby power loss and no false triggering in high-impedance circuits. |
| Response Time | <1 ns - Enables suppression before sensitive logic or analog circuitry experiences overvoltage damage. |
| UL 497B | Certified for isolated loop circuit protection - Validates safe use in telecom, medical, and industrial isolation barriers. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with cathode band polarity marking. Dimensions: 4.32 mm × 2.30 mm × 1.02 mm (L × W × H). Leads are modified L-bend for enhanced pad adhesion and solderability at 260 °C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to ground or low-impedance return plane; must minimize trace inductance to reduce overshoot. |
| Cathode | Transient voltage input node | Connected to protected line (e.g., 24 V rail, RS-485 bus); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Withstands 1 ms surges up to 4.8 A without degradation-sufficient for IEC 61000-4-5 4th-level testing. |
| UL 497B recognition | Validated for protector-class isolation barrier compliance-enables use in certified telecom and medical equipment. |
| Class 3 HBM ESD rating | Survives >16 kV human-body-model discharges-eliminates need for additional board-level ESD components. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Narrows voltage margin between trigger and clamp-reduces risk of overstress on 100 V-rated ICs. |
| Pb-free & RoHS compliant | Meets global environmental regulations and reflow profile compatibility (JEDEC J-STD-020). |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12/24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach PMIC or MCU power pins. Use Value: Limits voltage to ≤125 V during 4.8 A transients-within safe operating area of 130 V-rated automotive-grade regulators. |
Use Scenario: 24 V digital input channels in programmable logic controllers subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each optocoupler input line to shunt induced common-mode spikes before signal conditioning. Use Value: Sub-1 ns response prevents latch-up in 74HC-series buffers; UL 497B certification supports functional safety requirements. |
| Telecom Line Interface Protection | Medical Isolated Sensor Supply Protection |
Use Scenario: RS-485 transceiver bus lines in base station remote units exposed to lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional P6SMB91AT3 guards VCC-supplied bias networks feeding termination resistors. Use Value: 77.8 V VRWM matches typical 80 V isolation barrier ratings; clamping at 125 V avoids exceeding transceiver's 130 V abs max. |
Use Scenario: Secondary-side 24 V DC-DC output powering isolated pressure sensors in patient-connected diagnostic devices. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output to prevent transient coupling into sensor front-end amplifiers via shared ground paths. Use Value: UL 497B listing confirms suitability for protected patient-accessible circuits; 5 µA leakage avoids signal offset errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ90A | Same SMB package, 90 V VBR, 129 V VC @ 4.3 A, 400 W PPK | Lower peak power and higher clamping voltage reduce margin for severe surges. | Select when cost sensitivity outweighs need for full 600 W surge headroom. |
| 1.5SMC91A | SMB-compatible SMC package, 91 V VBR, 125 V VC @ 4.8 A, same 600 W rating but larger 7.1 mm × 6.2 mm footprint | Larger thermal mass improves repetitive surge handling but requires PCB layout change. | Choose for high-reliability industrial systems needing extended thermal endurance beyond single-event rating. |
Compared with P6SMB91AT3, SMAJ90A offers lower cost but reduced surge robustness, while 1.5SMC91A provides identical electrical specs with superior thermal cycling life at the expense of board space-making P6SMB91AT3 optimal for space-constrained automotive and telecom modules.
Availability
P6SMB91AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P6SMB91AT3 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 solutions for automotive, industrial, and communications markets.
The P6SMB91AT3 belongs to ON Semiconductor's SMB-series transient voltage suppressor family, engineered for high-energy surge immunity in harsh environments where reliability, certification, and compact packaging are critical.
FAQ
What is the maximum clamping voltage of the P6SMB91AT3 under surge conditions?
The P6SMB91AT3 has a maximum clamping voltage (VC) of 125 V when subjected to its rated peak pulse current of 4.8 A for a 1 ms waveform. This value is measured per Figure 2 in the ON Semiconductor datasheet and represents the upper limit of voltage seen by downstream components during worst-case transient events-critical for ensuring compatibility with 130 V absolute maximum rated ICs.
Is the P6SMB91AT3 suitable for bidirectional signal line protection?
No, the P6SMB91AT3 is a unidirectional TVS diode and only conducts in reverse breakdown mode. For bidirectional protection-such as AC-coupled data lines or differential buses like RS-485-ON Semiconductor specifies separate part numbers like P6SMB91CAT3. Using P6SMB91AT3 on bidirectional signals risks forward conduction and improper clamping during negative transients.
Does the P6SMB91AT3 meet automotive qualification standards?
Yes, the P6SMB91AT3 is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control, body electronics, and infotainment systems. Its construction, testing, and traceability comply with automotive quality management requirements, and it carries the SZ prefix variant (SZP6SMB91AT3G) for automotive-specific site controls.
How does the P6SMB91AT3 compare to standard Zener diodes in surge protection?
Unlike general-purpose Zener diodes, the P6SMB91AT3 is optimized for transient suppression: it delivers 600 W peak power handling, <1 ns response, and guaranteed clamping performance under standardized 1 ms surge waveforms. Standard Zeners lack defined surge ratings, exhibit higher dynamic impedance, and may fail catastrophically under similar energy levels-making P6SMB91AT3 the appropriate choice for IEC 61000-4-5 or ISO 7637-2 compliance.
What is the recommended PCB layout practice for optimal performance of the P6SMB91AT3?
To maximize effectiveness, place the P6SMB91AT3 as close as possible to the protected node with minimal trace length-especially on the cathode side-and route both anode and cathode traces directly to low-inductance ground/power planes. Avoid vias in current paths, use ≥1 mm² copper pour for thermal relief, and follow ON Semiconductor's Case 403A footprint guidelines to ensure proper solder joint formation and thermal dissipation during surge events.
P6SMB91AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
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- Capacitance @ Frequency:
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- Operating Temperature:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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P6SMB91AT3 FAQ
1.How can I place an order for P6SMB91AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB91AT3 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 P6SMB91AT3 reliable?
The price and inventory of P6SMB91AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB91AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB91AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB91AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB91AT3?
P6SMB91AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB91AT3 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 P6SMB91AT3?
For technical support, including P6SMB91AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB91AT3 requirements.
6.How does Aetrix verify that P6SMB91AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB91AT3 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 P6SMB91AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB91AT3?
All P6SMB91AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB91AT3, 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 P6SMB91AT3 part is unused and in its original packaging.
Return procedure for P6SMB91AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB91AT3 Tags
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