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P6SMB22AT3G Equivalent & Substitute Parts
Part Overview
The P6SMB22AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional Zener diode operates with an 18.8V reverse standoff voltage and provides 30.6V clamping at peak pulse current. The component is packaged in the DO-214AA (SMB) surface mount format with a peak pulse power rating of 600W.
The P6SMB22AT3G is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including Eaton, Vishay, STMicroelectronics, Taiwan Semiconductor Corporation, Meritek, and Micro Commercial Co, offering direct functional replacements with maintained or enhanced electrical performance characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 18.8 | V |
| Voltage - Breakdown (Min) | 20.9 | V |
| Voltage - Clamping (Max) @ Ipp | 30.6 | V |
| Current - Peak Pulse (10/1000µs) | 20 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -65°C to 150°C | TJ |
| Package / Case | DO-214AA, SMB | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the P6SMB22AT3G is determined by the following critical electrical and mechanical parameters:
Voltage Parameters: Reverse standoff voltage must be 18.8V (±tolerance), breakdown voltage minimum 20.9V, and clamping voltage maximum 30.6V. These parameters define the protection threshold and response characteristics.
Current and Power Ratings: Peak pulse current (10/1000µs) and peak pulse power must meet or exceed the original specification (20A, 600W minimum). Higher ratings provide enhanced transient suppression capability.
Package and Mounting: All substitutes must use DO-214AA (SMB) surface mount packaging to ensure mechanical and electrical compatibility with existing PCB layouts.
Diode Type and Configuration: All substitutes must be unidirectional Zener diodes with a single channel configuration.
Temperature Range: Operating temperature range must encompass the original specification (-65°C to 150°C minimum). Extended ranges provide additional operational margin.
Compliance: RoHS3 compliance and MSL 1 rating are required for environmental and handling compatibility.
Substitute parts meeting these criteria are functionally equivalent and may be selected based on availability, manufacturer preference, and application-specific performance requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Product Status |
|---|---|---|---|---|---|---|---|
| P6SMB22AT3G | Littelfuse Inc. | 18.8 | 30.6 | 20 | 600 | -65 to 150 | Obsolete |
| P6SMB22A | Eaton - Electronics Division | 18.8 | 30.6 | 19.7 | 600 | -55 to 150 | Active |
| P6SMB22A-E3/52 | Vishay General Semiconductor - Diodes Division | 18.8 | 30.6 | 19.6 | 600 | -65 to 150 | Active |
| SM6T22A | STMicroelectronics | 18.8 | 30.6 | 102 (8/20µs) | 600 | -55 to 150 | Active |
| SM6T22A-M3/52 | Vishay General Semiconductor - Diodes Division | 18.8 | 30.6 | 20 | 600 | -65 to 150 | Active |
| SM6T22A-M3/5B | Vishay General Semiconductor - Diodes Division | 18.8 | 30.6 | 20 | 600 | -65 to 150 | Active |
| 1KSMB22A | Taiwan Semiconductor Corporation | 18.8 | 30.6 | 32.7 | 1000 | -55 to 175 | Active |
| SMBJP6KE22A-TP | Micro Commercial Co | 18.8 | 30.6 | 19.9 | 600 | -55 to 175 | Active |
| SMBJ17A | Meritek | 17 | 27.6 | 21.74 | 600 | -55 to 150 | Active |
Engineering Selection Recommendations
Direct Equivalents (Preferred): P6SMB22A-E3/52, SM6T22A-M3/52, and SM6T22A-M3/5B maintain identical voltage and power specifications with active product status and full RoHS3 compliance. These parts are recommended for direct replacement in existing designs.
Enhanced Performance Alternatives: 1KSMB22A offers increased peak pulse current (32.7A) and power rating (1000W) with extended operating temperature range (-55°C to 175°C), providing superior transient suppression capability. This part is suitable for applications requiring enhanced protection margins.
Functional Equivalents: P6SMB22A (Eaton) and SMBJP6KE22A-TP (Micro Commercial Co) provide equivalent electrical performance with slightly lower peak pulse current ratings (19.7A and 19.9A respectively) but maintain 600W power dissipation. Both are active products with full compliance certifications.
Alternative Voltage Rating: SMBJ17A operates at a lower reverse standoff voltage (17V) and clamping voltage (27.6V). This part is suitable only for applications where the lower protection threshold is acceptable and does not exceed system voltage requirements.
All recommended substitutes are manufactured by established semiconductor suppliers with active product status, ensuring long-term availability and supply chain stability.
Frequently Asked Questions (FAQ)
Q: Can I use SMBJ17A as a direct replacement for P6SMB22AT3G?
A: SMBJ17A has a lower reverse standoff voltage (17V vs. 18.8V) and clamping voltage (27.6V vs. 30.6V). It is functionally equivalent only if your application operates at or below the lower voltage threshold. For systems designed around the 18.8V standoff specification, use parts with matching voltage ratings.
Q: What is the difference between P6SMB22A and SM6T22A?
A: Both maintain identical voltage specifications (18.8V standoff, 30.6V clamping). SM6T22A has significantly higher peak pulse current (102A at 8/20µs vs. 20A at 10/1000µs), indicating different pulse waveform testing standards. Both are suitable substitutes; selection depends on your specific transient pulse profile.
Q: Is 1KSMB22A compatible with the original P6SMB22AT3G footprint?
A: Yes. 1KSMB22A uses the same DO-214AA (SMB) surface mount package and pinout. It provides enhanced performance with 32.7A peak pulse current and 1000W power rating, making it suitable for applications requiring higher transient energy absorption.
Q: Do all substitute parts have the same operating temperature range?
A: No. The original P6SMB22AT3G operates from -65°C to 150°C. Substitutes vary: P6SMB22A and SMBJ17A operate from -55°C to 150°C, while 1KSMB22A and SMBJP6KE22A-TP extend to -55°C to 175°C. Verify your application's temperature requirements before selection.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and handling requirements equivalent to the original part.
Q: What packaging options are available for these substitutes?
A: All substitutes are supplied in DO-214AA (SMB) surface mount packaging. Packaging formats vary by manufacturer: Cut Tape (CT), Digi-Reel®, and Tape & Reel (TR) options are available. Verify packaging availability with your supplier for your specific procurement requirements.
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