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onsemi P6SMB51AT3
- Part No.:
- P6SMB51AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
P6SMB51AT3.pdf
- Description:
- TVS ZENER UNIDIR 600W 51V SMB
- Quantity:
- Payment:
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Inventory:9,770
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Product details
Overview
P6SMB51AT3 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 43.6 V working peak reverse voltage (VRWM), 51 V nominal Zener breakdown voltage (VBR) at 1 mA test current, clamps to ≤70.1 V at 8.6 A peak pulse current (IPP), and responds in <1 ns to ESD and surge transients. It is used in automotive power supplies and industrial I/O interfaces requiring robust ±16 kV HBM ESD protection.
For engineers reviewing the P6SMB51AT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SMB package mechanical data, real-world clamping behavior under 1 ms 8.3 ms half-sine surges, UL 497B certification for isolated loop circuits, and validated alternatives for circuit protection redesigns.
Technical Context
The P6SMB51AT3 operates as a silicon avalanche diode with unidirectional polarity, conducting only during reverse overvoltage events above its VRWM threshold. Its low zener impedance and fast <1 ns response enable effective suppression of ESD (IEC 61000-4-2 Level 4), lightning-induced surges (IEC 61000-4-5), and inductive switching spikes without affecting normal forward-biased operation.
It is rated for 600 W peak pulse power (10/1000 µs waveform), withstands 100 A non-repetitive forward surge current (8.3 ms half-sine), and maintains stable clamping performance across −65 °C to +150 °C operating temperature range. Thermal resistance from junction-to-lead is 40 °C/W, supporting high-reliability mounting on FR-4 PCBs with ON Semiconductor's recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 43.6 V - maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT = 1 mA | 51.05 V (min) to 53.6 V (max) - precise Zener breakdown window defining turn-on threshold |
| VC @ IPP = 8.6 A | 70.1 V - maximum clamped voltage seen by protected circuit during worst-case surge |
| IPP | 8.6 A - peak pulse current capability at 1 ms pulse width, defining surge energy handling |
| IR @ VRWM | 5 µA - ultra-low leakage ensuring minimal standby power loss and signal integrity |
| ESD Rating | Class 3 (>16 kV) per HBM - qualifies for high-reliability end-equipment ESD immunity testing |
| UL Recognition | UL 497B QVGQ2 - certified for isolated loop circuit protection in telecom and industrial systems |
Pinout & Package
The P6SMB51AT3 is housed in an SMB (DO-214AA) surface-mount package (Case 403A), featuring a cathode band marking and modified L-bend leads for enhanced solder joint reliability. The package is void-free, thermosetting plastic with corrosion-resistant finishes and Pb-free construction (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail during transient suppression |
| Cathode | Reverse-biased clamping terminal | Connected to protected line; conducts when reverse voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 600 W Peak Pulse Power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2/5a) without failure |
| <1 ns Response Time | Minimizes voltage overshoot before clamping engages, critical for protecting fast logic |
| Low Clamping Ratio (VC/VBR ≈ 1.37) | Ensures tight voltage margin between operating rail and clamp level for safe IC margining |
| UL 497B Certification | Validates suitability for safety-critical telecom and industrial isolated interface protection |
| Pb-Free SURMETIC® Package | Meets RoHS and JEDEC J-STD-020 reflow requirements with 260 °C / 10 s soldering tolerance |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 43.6 V. Use Value: Limits transient voltage to ≤70.1 V at 8.6 A, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding 24 V digital input modules in factory automation against field-wiring induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input channel to absorb inductive kickback from solenoid/relay coils. Use Value: Withstands 100 A forward surge and maintains <5 µA leakage at 43.6 V, preserving signal fidelity during normal operation. |
| Medical Equipment Power Entry | Telecom Line Interface Protection |
Use Scenario: Input-stage surge protection for AC/DC adapters powering diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Primary-level TVS on DC output side of adapter, coordinated with upstream MOVs and fuses. Use Value: UL 497B recognition ensures compliance with medical safety standards for isolated power circuits. | Use Scenario: Secondary-side protection on RS-485 or Ethernet PHY power rails in network edge devices. IC Role / Device Role / Timing Role: Low-capacitance (≈395 pF at 0 V) unidirectional clamp on VCC line feeding isolated transceivers. Use Value: 395 pF junction capacitance avoids signal integrity degradation while delivering 600 W surge immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Same SMB package, identical VRWM (43.6 V), VBR (51–53.6 V), and VC (70.1 V), but rated for 600 W per JEDEC standard vs. ON Semi's proprietary test method | No functional difference in circuit protection; identical layout and thermal profile | Select SMBJ51A if sourcing from multiple authorized distributors with tighter lead-time control |
| 1.5SMC51A | Larger SMC package (DO-214AB), same electrical specs, higher thermal mass (RJA = 180 °C/W vs. 226 °C/W), 3 kW peak power rating | Better suited for high-temperature ambient environments (>85 °C) or where board space allows larger footprint | Choose 1.5SMC51A when long-term reliability under sustained thermal stress is prioritized over compactness |
Compared with SMBJ51A and 1.5SMC51A, the P6SMB51AT3 offers optimal balance of compact SMB footprint, UL 497B certification for isolated loops, and proven field reliability in automotive and industrial power rails-making it preferred where space-constrained designs require safety-recognized surge immunity.
Availability
P6SMB51AT3 is available at Aetrix Electronics and suitable for automotive power management, industrial PLC I/O modules, and medical power supply designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for P6SMB51AT3 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 P6SMB51AT3 belongs to the P6SMBxxAT3 series of unidirectional TVS diodes engineered specifically for high-reliability DC rail and interface protection in harsh electromagnetic environments.
FAQ
What is the working peak reverse voltage (VRWM) of the P6SMB51AT3?
The P6SMB51AT3 has a VRWM of 43.6 V, meaning it remains in high-impedance blocking mode up to this voltage and begins clamping only when reverse transients exceed this threshold. This value ensures compatibility with 48 V nominal systems while providing sufficient margin against ripple and noise. The P6SMB51AT3 datasheet confirms this parameter is measured at 25 °C with <5 µA leakage.
How does the clamping voltage VC of the P6SMB51AT3 compare to its breakdown voltage VBR?
The P6SMB51AT3 clamps to a maximum of 70.1 V at 8.6 A peak pulse current (IPP), while its VBR ranges from 51.05 V to 53.6 V at 1 mA. This yields a clamping ratio of ~1.37, indicating tight voltage control during surge events. The P6SMB51AT3 achieves this via low zener impedance and optimized junction design, minimizing overshoot in sensitive power domains.
Is the P6SMB51AT3 certified for safety-critical applications?
Yes, the P6SMB51AT3 carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection, validating its use in telecom, medical, and industrial safety-rated systems. This certification covers strike voltage breakdown, endurance conditioning, and dielectric withstand tests-far exceeding basic flammability ratings. The P6SMB51AT3 meets these requirements as a discrete component without external circuitry.
What package type and mounting specifications apply to the P6SMB51AT3?
The P6SMB51AT3 uses the SMB (DO-214AA) surface-mount package (Case 403A) with cathode band polarity marking, modified L-bend leads, and Pb-free SURMETIC® construction. It supports reflow soldering up to 260 °C for 10 seconds and requires ON Semiconductor's recommended footprint for optimal thermal dissipation. The P6SMB51AT3 mechanical drawing specifies 4.06–4.60 mm E dimension and 0.76–1.60 mm L lead length.
Can the P6SMB51AT3 replace older P6SMB51A variants in existing designs?
Yes, the P6SMB51AT3 is a direct replacement for legacy P6SMB51A parts, maintaining identical electrical specs, SMB package dimensions, and pinout. The "T3" suffix denotes tape-and-reel packaging, and "G" indicates Pb-free compliance-both fully backward-compatible. No PCB layout or firmware changes are needed when upgrading to the P6SMB51AT3 in production or repair scenarios.
P6SMB51AT3 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
P6SMB51AT3 FAQ
1.How can I place an order for P6SMB51AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB51AT3 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 P6SMB51AT3 reliable?
The price and inventory of P6SMB51AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB51AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB51AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB51AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB51AT3?
P6SMB51AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB51AT3 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 P6SMB51AT3?
For technical support, including P6SMB51AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB51AT3 requirements.
6.How does Aetrix verify that P6SMB51AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB51AT3 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 P6SMB51AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB51AT3?
All P6SMB51AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB51AT3, 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 P6SMB51AT3 part is unused and in its original packaging.
Return procedure for P6SMB51AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB51AT3 Tags
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