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onsemi P6SMB68AT3
- Part No.:
- P6SMB68AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB68AT3.pdf
- Description:
- TVS DIODE 58.1VWM 92VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,933
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Product details
Overview
P6SMB68AT3 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 58.1 V working peak reverse voltage (VRWM), 68 V nominal Zener breakdown voltage (VBR) at 1 mA test current, clamps to ≤92 V at 6.5 A peak pulse current (IPP), and delivers sub-1 ns response time with <5 µA leakage above 10 V. It is used in industrial power supplies to safeguard rectifier outputs and DC bus nodes against ESD and lightning-induced surges.
For engineers reviewing the P6SMB68AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. protected device's absolute maximum rating, surge current capability under 1 ms 10/1000 µs waveform, UL 497B certification for isolated loop protection, and SMB package thermal performance on FR-4 PCBs.
Technical Context
The P6SMB68AT3 operates as a silicon avalanche diode, leveraging controlled Zener breakdown to shunt transient energy away from sensitive downstream circuitry. Its unidirectional polarity enables use on positive-rail-only protection paths without reverse conduction concerns.
It is rated for 600 W non-repetitive peak pulse power per 1 ms 10/1000 µs waveform, with thermal derating to 0.55 W at 25°C ambient and junction-to-lead thermal resistance of 40°C/W. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 58.1 V - Minimum continuous reverse voltage the device blocks without significant leakage; must exceed system's max DC operating voltage. |
| VBR @ IT = 1 mA | 68 V (min 64.6 V, max 71.4 V) - Voltage at which avalanche conduction begins; defines threshold for clamping activation. |
| VC @ IPP = 6.5 A | ≤92 V - Maximum voltage seen by protected circuit during full-rated surge; must be below IC's absolute max rating. |
| IPP | 6.5 A - Peak pulse current the device safely clamps at 1 ms 10/1000 µs waveform; determines surge energy handling (≈3.0 J). |
| IR @ VRWM | ≤5 µA - Reverse leakage at working voltage; ensures minimal standby power loss and no false triggering. |
| Response Time | <1 ns - Time from transient onset to clamping onset; critical for protecting fast logic and analog interfaces. |
| Capacitance @ 0 V | 305 pF - Junction capacitance at zero bias; impacts high-frequency signal integrity in data line protection. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, unidirectional, cathode indicated by band. Dimensions: 4.06–4.60 mm length × 3.30–3.95 mm width × 1.90–2.45 mm height. Pb-free (RoHS-compliant) version marked with "G" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during positive transients. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., +12 V rail); conducts avalanche current to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles 10/1000 µs surges up to 3.0 J without degradation-sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) testing. |
| UL 497B recognition | Validated for isolated loop protection in telecom and industrial control systems-meets strike voltage, endurance, and dielectric withstand requirements. |
| ESD Class 3 compliance | Withstands >16 kV human-body-model discharge-enables robust front-end protection in exposed connectors and ports. |
| Low zener impedance | Ensures stable clamping voltage across varying surge currents-reduces voltage overshoot during fast-rising transients. |
| SURMETIC® package | Void-free thermoset molding provides mechanical reliability, moisture resistance, and consistent thermal performance on standard reflow profiles. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module Inputs |
|---|---|
|
Use Scenario: Protecting 48 V DC bus nodes in programmable logic controller (PLC) power distribution modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed in parallel with bus rail, clamping transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤92 V during 6.5 A surges, preventing latch-up or gate oxide damage in downstream 100 V-rated MOSFETs and regulators. |
Use Scenario: Safeguarding LIN bus inputs and sensor supply lines in BCMs against battery reverse connection and alternator load dump events. IC Role / Device Role / Timing Role: Standoff protection element mounted directly at connector entry point, shunting energy before it propagates into ASIC interface pins. Use Value: Sub-1 ns response ensures clamping occurs before 12 V rail transients exceed 36 V-within ISO 16750-2 pulse 5a limits for automotive electronics. |
| Medical Equipment AC/DC Adapter Outputs | Telecom Remote Terminal Unit Power Inputs |
|
Use Scenario: Securing secondary-side 24 V outputs of medical-grade AC/DC adapters against ESD and conducted surges per IEC 60601-1-2. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp on isolated output, coordinated with upstream Y-cap and common-mode choke filtering. Use Value: UL 497B recognition validates suitability for patient-connected equipment; 5 µA leakage avoids compromising isolation barrier integrity. |
Use Scenario: Protecting -48 V DC power inputs of DSLAM remote terminals exposed to lightning-induced surges on outdoor copper pairs. IC Role / Device Role / Timing Role: Primary surge diverter in multi-stage protection network, paired with gas discharge tube (GDT) and series impedance. Use Value: 600 W rating supports coordination with GDT let-through energy; 305 pF capacitance avoids signal distortion on 2.048 Mbps E1 lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | 64 V VRWM, 71.1 V VBR min, 100 V VC @ 6.1 A - lower clamping voltage but reduced surge rating (600 W same, but IPP = 6.1 A). | Better suited for 56–60 V nominal rails where tighter VRWM margin is needed; less margin for 68 V systems. | Select SMBJ64A only if system operating voltage is ≤56 V and clamping headroom below 100 V is critical. |
| 1.5SMC68A | Same 68 V VBR, but DO-214AB package (larger), 1.5 kW rating, 10.5 A IPP - higher surge capacity but 2× footprint and thermal mass. | Preferred for high-reliability industrial designs requiring >6.5 A surge margin or extended thermal cycling life. | Choose 1.5SMC68A when PCB layout allows larger package and surge requirement exceeds 6.5 A under 1 ms pulse. |
Compared with SMBJ64A, P6SMB68AT3 offers higher VRWM margin for 68 V systems but slightly higher clamping voltage; versus 1.5SMC68A, it saves board space and cost while delivering adequate surge protection for most 48–72 V DC applications.
Availability
P6SMB68AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical AC/DC adapters, and telecom remote terminal units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P6SMB68AT3 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, sensors, and discrete devices for automotive, industrial, and communications markets.
The P6SMB68AT3 belongs to the P6SMBxxAT3 series of unidirectional TVS diodes engineered for high-energy transient suppression in space-constrained surface-mount applications-designed to meet UL 497B and IEC 61000-4-5 requirements.
FAQ
What is the working peak reverse voltage (VRWM) of the P6SMB68AT3?
The P6SMB68AT3 has a VRWM of 58.1 V, meaning it reliably blocks reverse voltages up to this level with ≤5 µA leakage. This value ensures safe operation on 48 V or 56 V DC systems where transient margins require ≥10% headroom above nominal voltage. The P6SMB68AT3 maintains this specification across −65°C to +150°C operating temperature range.
How does the clamping voltage (VC) of the P6SMB68AT3 compare to its breakdown voltage (VBR)?
The P6SMB68AT3 exhibits a VBR of 68 V (nominal) at 1 mA test current, while its maximum clamping voltage VC is 92 V at 6.5 A peak pulse current. This 24 V differential reflects the device's dynamic impedance under surge conditions and defines the worst-case overvoltage imposed on protected circuitry-critical for ensuring compatibility with 100 V-rated downstream components.
Is the P6SMB68AT3 certified for use in safety-critical applications like medical or telecom equipment?
Yes, the P6SMB68AT3 carries UL 497B recognition (File #E210057) for isolated loop circuit protection, validating its performance in medical AC/DC adapters and telecom remote terminals. It passed strike voltage breakdown, endurance conditioning, and dielectric withstand tests-exceeding basic flammability-only certifications held by many competitors.
What is the thermal derating behavior of the P6SMB68AT3 above 25°C ambient temperature?
The P6SMB68AT3 has a DC power dissipation rating of 0.55 W at 25°C ambient, derating linearly at 4.4 mW/°C above that point. At 75°C ambient, its usable DC power drops to 0.33 W. For pulsed operation, Figure 3 in the datasheet shows 60% derating at 100°C ambient-ensuring reliable surge handling even in thermally demanding enclosures.
Can the P6SMB68AT3 be used in bidirectional transient protection circuits?
No-the P6SMB68AT3 is strictly unidirectional and lacks symmetrical avalanche characteristics. For bidirectional protection, ON Semiconductor specifies separate parts such as P6SMB68CAT3. Using P6SMB68AT3 in reverse-biased configurations risks premature failure due to lack of specified reverse conduction capability.
P6SMB68AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 305pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB68AT3 FAQ
1.How can I place an order for P6SMB68AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB68AT3 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 P6SMB68AT3 reliable?
The price and inventory of P6SMB68AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB68AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB68AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB68AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB68AT3?
P6SMB68AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB68AT3 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 P6SMB68AT3?
For technical support, including P6SMB68AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB68AT3 requirements.
6.How does Aetrix verify that P6SMB68AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB68AT3 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 P6SMB68AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB68AT3?
All P6SMB68AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB68AT3, 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 P6SMB68AT3 part is unused and in its original packaging.
Return procedure for P6SMB68AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB68AT3 Tags
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onsemi
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