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onsemi P6SMB22AT3
- Part No.:
- P6SMB22AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB22AT3.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,770
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Product details
Overview
P6SMB22AT3 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 18.8 V working peak reverse voltage (VRWM), 22 V nominal Zener breakdown voltage (VBR) at 1 mA test current, clamps to ≤30.6 V at 20 A peak pulse current (IPP), and delivers sub-1 ns response time with <5 µA leakage above VRWM. It is widely deployed in automotive power supply inputs and industrial I/O interfaces.
For engineers reviewing the P6SMB22AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, surge current handling under 10/1000 µs waveform, UL 497B certification for isolated loop protection, and SMB package thermal performance in high-density PCB layouts.
Technical Context
The P6SMB22AT3 operates as a silicon avalanche diode, leveraging controlled Zener breakdown to shunt transient energy away from sensitive circuitry. Its low dynamic impedance (<0.6 Ω typical between 1–20 A) ensures stable clamping across surge currents, while its thermally robust SURMETIC® SMB package supports 260°C soldering and maintains junction-to-lead thermal resistance of 40°C/W.
This device is rated for non-repetitive 1 ms pulses up to 600 W, with derating to 226°C/W junction-to-ambient resistance at 25°C ambient. It meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection - a requirement for telecom and industrial fieldbus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms 10/1000 µs waveform - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage (VRWM) | 18.8 V - maximum continuous DC or peak AC voltage the device blocks before clamping |
| Zener Breakdown Voltage (VBR) | 22 V min / 23.1 V max @ 1 mA - defines precise turn-on threshold for overvoltage detection |
| Clamping Voltage (VC) | ≤30.6 V @ IPP = 20 A - limits protected circuit voltage during worst-case surge |
| Leakage Current (IR) | <5 µA @ 18.8 V - negligible standby power loss and minimal impact on high-impedance bias networks |
| Response Time | <1 ns - enables protection of fast-edge digital signals and switching power supply control loops |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct handling in unshielded assembly environments |
Pinout & Package
The P6SMB22AT3 is housed in an SMB (DO-214AA) surface-mount package per CASE 403A, featuring a cathode-indicating polarity band and modified L-bend leads for enhanced pad adhesion. The void-free thermosetting plastic case supports reflow and wave soldering at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse transient |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V rail); carries full surge current into ground via anode |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - eliminates need for separate safety certification in industrial comms designs |
| Surge Robustness | Withstands 600 W peak power (10/1000 µs) - protects against IEC 61000-4-5 Level 4 surges (4 kV line-earth) |
| Low Clamping Ratio | VC/VBR ≈ 1.39 - tight voltage margin preserves headroom for downstream ICs with 30 V absolute max ratings |
| Pb-Free Option | P6SMB22AT3G variant available - complies with RoHS and JEDEC J-STD-020 reflow profiles |
| Thermal Performance | RJL = 40°C/W - enables reliable operation at 75°C lead temperature with 3.0 W DC dissipation |
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 alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going spikes before they reach DC/DC converters. Use Value: Clamps 20 A surge to ≤30.6 V, preventing damage to 36 V-rated buck controllers and preserving system uptime during vehicle cranking events. |
Use Scenario: 24 V digital input modules receiving signals from field sensors in factory automation environments. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each input channel to absorb EFT bursts (IEC 61000-4-4) and lightning-induced surges. Use Value: Sub-1 ns response ensures clamping occurs before microcontroller GPIOs experience overvoltage stress, reducing firmware lockup and field returns. |
| Telecom Line Interface Protection | Medical Equipment Power Supply Ingress |
Use Scenario: Isolated RS-485 transceivers connected to long outdoor cabling susceptible to induced lightning surges. IC Role / Device Role / Timing Role: Primary protection stage upstream of GDT or polymer PTC, limiting voltage seen by secondary protection and ICs. Use Value: UL 497B recognition confirms suitability for telecom isolation barriers; 30.6 V clamping aligns with ±25 V common-mode tolerance of ISO 3082-grade transceivers. |
Use Scenario: Auxiliary 5 V/12 V power rails in diagnostic imaging systems requiring compliance with IEC 60601-1 creepage/clearance and surge immunity. IC Role / Device Role / Timing Role: Final-stage overvoltage clamp on low-noise LDO inputs to prevent latch-up in analog front-end ASICs. Use Value: <5 µA leakage avoids loading precision voltage references; SMB footprint allows placement within tight clearance zones near high-voltage sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | Same SMB package, identical VRWM (18.8 V) and VC (30.6 V), but rated for 600 W per JEDEC standards (vs. ON Semi's proprietary test method) | No UL 497B recognition; lacks isolated loop certification required for telecom/industrial fieldbus | Select when UL certification is not mandated and sourcing flexibility across multiple distributors is prioritized |
| 1.5SMC22A | Larger SMC package (DO-214AB), same electrical specs, higher thermal mass (RJA = 19°C/W vs. 226°C/W), but 2× PCB area | Better sustained power handling in high-ambient environments; incompatible with dense SMB footprints | Select when board space permits and long-duration surge immunity (e.g., repeated EFT) outweighs miniaturization goals |
Compared with SMBJ22A and 1.5SMC22A, the P6SMB22AT3 uniquely combines UL 497B certification, SMB footprint efficiency, and verified 600 W surge capability - making it optimal for space-constrained, safety-certified industrial and automotive power interfaces where layout revision is costly.
Availability
P6SMB22AT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, and medical power supply designs requiring stable component supply, long-term lifecycle support, and traceable Pb-free sourcing.
Supply support for P6SMB22AT3 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 devices for automotive, industrial, and cloud power applications.
The P6SMB22AT3 belongs to the P6SMBxxAT3 series of unidirectional TVS diodes engineered specifically for robust, certified overvoltage protection in harsh electromagnetic environments - targeting design-in reliability for mission-critical power and interface circuits.
FAQ
What is the maximum clamping voltage of the P6SMB22AT3 under surge conditions?
The P6SMB22AT3 clamps to a maximum of 30.6 V when subjected to a 20 A peak pulse current (IPP) with a 10/1000 µs waveform. This value is measured per ON Semiconductor's standard test conditions and represents the upper limit of voltage imposed on the protected circuit during worst-case transient events - critical for ensuring compatibility with downstream components rated for ≤30 V absolute maximum.
Does the P6SMB22AT3 meet UL safety certification requirements?
Yes, the P6SMB22AT3 is UL 497B recognized (File #E210057) for isolated loop circuit protection. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming its suitability for safety-critical telecom, industrial control, and medical applications where regulatory compliance is mandatory.
What is the leakage current specification for the P6SMB22AT3 at its working voltage?
The P6SMB22AT3 exhibits a maximum reverse leakage current (IR) of 5 µA when biased at its working peak reverse voltage of 18.8 V. This ultra-low leakage ensures minimal power loss in standby mode and prevents unintended loading of high-impedance voltage dividers or reference nodes - essential for battery-powered and precision analog systems.
Can the P6SMB22AT3 be used in bidirectional transient protection applications?
No, the P6SMB22AT3 is a unidirectional TVS diode intended only for DC or single-polarity signal line protection. For bidirectional applications such as AC lines or differential buses (e.g., RS-485), ON Semiconductor offers the P6SMB22CAT3 variant - which shares the same package and clamping performance but provides symmetrical breakdown in both directions.
What is the thermal resistance and maximum power dissipation of the P6SMB22AT3 at elevated temperatures?
The P6SMB22AT3 has a junction-to-lead thermal resistance (RJL) of 40°C/W and a DC power dissipation rating of 3.0 W at 75°C lead temperature. Above 75°C, it derates linearly at 25 mW/°C - supporting reliable operation in under-hood automotive or enclosed industrial enclosures where ambient temperatures exceed 70°C.
P6SMB22AT3 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 20A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 835pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB22AT3 FAQ
1.How can I place an order for P6SMB22AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB22AT3 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 P6SMB22AT3 reliable?
The price and inventory of P6SMB22AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB22AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB22AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB22AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB22AT3?
P6SMB22AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB22AT3 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 P6SMB22AT3?
For technical support, including P6SMB22AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB22AT3 requirements.
6.How does Aetrix verify that P6SMB22AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB22AT3 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 P6SMB22AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB22AT3?
All P6SMB22AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB22AT3, 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 P6SMB22AT3 part is unused and in its original packaging.
Return procedure for P6SMB22AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB22AT3 Tags
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