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onsemi P6SMB56AT3
- Part No.:
- P6SMB56AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB56AT3.pdf
- Description:
- TVS DIODE 47.8VWM 77VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,833
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Product details
Overview
P6SMB56AT3 from ON Semiconductor is a unidirectional 600 W peak power TVS diode designed for transient overvoltage protection in DC power rails and signal lines. It features a 47.8 V minimum breakdown voltage (VBR), 56 V nominal Zener voltage, 77 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and <1 ns response time - deployed in industrial power supplies, automotive ECUs, and telecom interface circuits.
For engineers reviewing the P6SMB56AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include working peak reverse voltage (47.8 V min), clamping performance under 10/1000 µs surge, UL 497B certification for isolated loop protection, low leakage (<5 µA @ 47.8 V), and SMB package thermal robustness up to +150°C junction temperature.
Technical Context
This device operates as a voltage-clamping transient suppressor in parallel with protected circuitry, conducting only when reverse voltage exceeds its specified breakdown threshold. Its silicon avalanche structure delivers fast turn-on (<1 ns), low dynamic impedance, and stable clamping across temperature (±0.103%/°C tempco).
The P6SMB56AT3 is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and maintains <5 µA reverse leakage at VRWM = 47.8 V - enabling reliable protection without loading normal operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 10/1000 µs waveform - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 47.8 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (VBR) | 53.2–58.8 V @ IT = 1 mA - tight tolerance ensures predictable turn-on threshold |
| Clamping Voltage (VC) | 77 V @ IPP = 7.8 A - limits downstream voltage stress during surge events |
| Reverse Leakage Current | <5 µA @ 47.8 V - negligible standby power loss and no signal integrity impact |
| Response Time | <1 ns - enables suppression of fast-rising ESD and lightning-induced spikes |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level ESD immunity |
| UL Recognition | UL 497B certified (File #E210057) - validated for isolated loop circuit protection in safety-critical systems |
Pinout & Package
Package: SMB (Case 403A), surface-mount, unidirectional, cathode-indicated by polarity band. Dimensions: 4.06–4.60 mm (E), 3.30–3.95 mm (D), 1.90–2.45 mm (A), 0.76–1.60 mm (L). RoHS-compliant Pb-free option available (P6SMB56AT3G).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; defines clamping reference point |
| Cathode | High-side transient input | Connected to protected line; conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse rating | Handles IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) without degradation |
| UL 497B recognition | Validated for telecom/data line isolation barriers per safety standard QVGQ2 |
| <1 ns response time | Minimizes voltage overshoot before clamping engages - critical for protecting fast logic |
| Low zener impedance | Ensures stable clamping across varying surge currents and temperatures |
| Pb-free SURMETIC® package | Thermally robust molded plastic housing with modified L-bend leads for reliable solder joint strength |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp surges to ≤77 V. Use Value: Prevents damage to upstream DC/DC converters and microcontrollers during 12 V/24 V system load dump events per ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in BCMs exposed to battery voltage transients. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on LIN data line and VBAT supply pins. Use Value: Maintains signal integrity during cranking (6.5–8.5 V) and jump-start (up to 16 V) while suppressing ESD per ISO 10605. |
| Telecom Interface Surge Protection | Medical Equipment Power Input |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in network edge devices from induced lightning surges. IC Role / Device Role / Timing Role: Primary clamping device on differential data lines and DC bias rails per IEC 61000-4-5. Use Value: Limits common-mode voltage excursion to <77 V, preserving transceiver operation and preventing latch-up. |
Use Scenario: Securing auxiliary 24 V power inputs in diagnostic imaging equipment against mains coupling and ESD. IC Role / Device Role / Timing Role: Front-end TVS on isolated DC input stage prior to medical-grade DC/DC converter. Use Value: Meets UL 497B requirements for patient-connected equipment, ensuring no hazardous energy transfer during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ56A | Same SMB package, identical 56 V nominal voltage, but lower 600 W rating applies at TL = 25°C (vs. P6SMB56AT3's rating at TL = 25°C with defined derating curve) | No UL 497B recognition; lacks isolated loop protector qualification | Select when UL certification is not required and thermal layout allows strict lead-temperature control. |
| 1.5SMC56A | Higher 1500 W peak power rating, DO-214AB package (larger footprint), 56 V nominal, 77 V clamping - same VC but higher surge margin | Requires PCB rework due to larger case size (7.11 × 6.22 mm vs. SMB's 4.6 × 3.95 mm); suited for high-reliability aerospace/military | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space permits larger package. |
Compared with SMBJ56A and 1.5SMC56A, the P6SMB56AT3 offers UL 497B certification in the compact SMB footprint with verified 600 W surge capability and industry-standard thermal derating - making it optimal for cost-sensitive, safety-certified industrial and automotive designs where board area is constrained.
Availability
P6SMB56AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom interface circuits requiring stable component supply, long-term lifecycle support, and compliance with UL 497B and AEC-Q200-aligned reliability expectations.
Supply support for P6SMB56AT3 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 energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The P6SMB56AT3 belongs to the P6SMBxxAT3 series of unidirectional TVS diodes engineered for robust transient suppression in space-constrained, safety-certified applications - particularly where UL 497B recognition and SMB footprint compatibility are mandatory.
FAQ
What is the clamping voltage of the P6SMB56AT3 at its rated peak pulse current?
The P6SMB56AT3 has a maximum clamping voltage (VC) of 77 V at a peak pulse current (IPP) of 7.8 A, measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across temperature and ensures downstream components remain within safe operating voltage limits during surge events. The P6SMB56AT3 achieves this with low dynamic impedance and stable avalanche characteristics.
Is the P6SMB56AT3 RoHS compliant and lead-free?
Yes, the P6SMB56AT3 is RoHS compliant and available in a Pb-free version designated as P6SMB56AT3G. The "G" suffix confirms compliance with JEDEC J-STD-609 and EU RoHS Directive 2011/65/EU. The SURMETIC® package uses lead-free molding compound and matte tin-plated leads, qualified for reflow soldering up to 260°C for 10 seconds.
Does the P6SMB56AT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire P6SMBxxAT3 series, including the P6SMB56AT3, holds UL 497B recognition under File #E210057 for protectors (QVGQ2 category). It passed all required tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge verification - confirming suitability for isolated telecom/data line protection in safety-critical systems.
What is the maximum operating temperature range for the P6SMB56AT3?
The P6SMB56AT3 is rated for an operating and storage temperature range of −65°C to +150°C. Its junction-to-lead thermal resistance (RJL) is 40°C/W, and it supports 3.0 W DC power dissipation at TL = 75°C with linear derating above that temperature. This wide range enables use in under-hood automotive, industrial motor drives, and outdoor telecom enclosures.
How does the P6SMB56AT3 differ from bidirectional TVS diodes like P6SMB56CAT3?
The P6SMB56AT3 is unidirectional and protects only against positive transients on the cathode side relative to anode (ground), while the P6SMB56CAT3 is bidirectional and clamps both polarities. The P6SMB56AT3 offers lower capacitance and tighter VBR tolerance for DC rail protection, whereas the "C" variant suits AC-coupled or floating signal lines. They share identical package, power rating, and clamping voltage magnitude but differ in polarity architecture and application scope.
P6SMB56AT3 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 365pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB56AT3 FAQ
1.How can I place an order for P6SMB56AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB56AT3 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 P6SMB56AT3 reliable?
The price and inventory of P6SMB56AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB56AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB56AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB56AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB56AT3?
P6SMB56AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB56AT3 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 P6SMB56AT3?
For technical support, including P6SMB56AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB56AT3 requirements.
6.How does Aetrix verify that P6SMB56AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB56AT3 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 P6SMB56AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB56AT3?
All P6SMB56AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB56AT3, 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 P6SMB56AT3 part is unused and in its original packaging.
Return procedure for P6SMB56AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB56AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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