P6SMB22CAT3G Equivalent & Substitute Parts

Part Overview

The P6SMB22CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface mount applications. This part operates with an 18.8V reverse standoff voltage and provides 30.6V clamping at peak pulse current, delivering 600W peak pulse power in a compact SMB (DO-214AA) package.

The P6SMB22CAT3G is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including Taiwan Semiconductor Corporation, Good-Ark Semiconductor, STMicroelectronics, and Micro Commercial Co, offering identical or enhanced electrical performance with current product status and improved availability.

Substiute Parts

P6SMB22CAT3G

LittelfuseIn Stock: 10230P6SMB22CAT3G Datasheet

Current PartRFQ

1KSMB22CA

Taiwan Semiconductor CorporationIn Stock: 10051KSMB22CA Datasheet

MFR RecommendedRFQ

P6SMB22CA

Good-Ark SemiconductorIn Stock: 20143P6SMB22CA Datasheet

MFR RecommendedRFQ

P6SMB22CA

Good-Ark SemiconductorIn Stock: 20143P6SMB22CA Datasheet

MFR RecommendedRFQ

SM6T22CA

STMicroelectronicsIn Stock: 9914SM6T22CA Datasheet

MFR RecommendedRFQ

SM6T22CAY

STMicroelectronicsIn Stock: 3342SM6T22CAY Datasheet

MFR RecommendedRFQ

SMBJP6KE22CA-TP

Micro Commercial CoIn Stock: 50367SMBJP6KE22CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6SMB22CAT3G are qualified based on the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 18.8V
• Voltage - Breakdown (Min): 20.9V
• Voltage - Clamping (Max) @ Ipp: 30.6V
• Package / Case: DO-214AA, SMB (surface mount)
• Type: Zener, Bidirectional
• RoHS3 Compliance

All substitute parts maintain these core specifications. Variations in peak pulse current (Ipp) and operating temperature ranges are permitted within the allowed parameter set, as these represent enhanced or equivalent performance characteristics. All substitutes are available from active manufacturers with current product status.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain electrical equivalence to the P6SMB22CAT3G across the critical voltage parameters (reverse standoff, breakdown, and clamping voltages) and package form factor. Selection among substitutes should be based on the following factors:

Product Availability and Status: All substitute parts carry active product status with current manufacturing support, addressing the obsolescence of the original P6SMB22CAT3G. Inventory levels vary by manufacturer and distributor.

Operating Temperature Range: The 1KSMB22CA and SMBJP6KE22CA-TP extend the upper operating temperature to 175°C, compared to 150°C for the original part and other substitutes. This provides additional thermal margin in high-temperature applications.

Peak Pulse Current and Power Handling: The 1KSMB22CA delivers 1000W peak pulse power (32.7A), providing enhanced transient protection capability. The SM6T22CA and SM6T22CAY variants specify 102A peak pulse current at 8/20µs waveform, indicating superior performance in specific transient scenarios. The P6SMB22CA, SMBJP6KE22CA-TP, and original part maintain 600W specifications.

Automotive Qualification: The SM6T22CAY carries AEC-Q101 automotive qualification, suitable for automotive and harsh environment applications requiring formal qualification documentation.

Compliance: All parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace P6SMB22CAT3G with any of these substitute parts?

A: Yes, all listed substitute parts are electrically and mechanically equivalent. They share identical reverse standoff voltage (18.8V), breakdown voltage (20.9V), clamping voltage (30.6V), and package form factor (DO-214AA, SMB). Direct PCB substitution is supported without circuit modification.

Q: What is the difference between the substitute parts?

A: The primary differences are manufacturer, product status (all active), peak pulse current ratings, operating temperature ranges, and availability. The 1KSMB22CA offers higher power handling (1000W vs 600W). The SM6T22CA and SM6T22CAY provide higher peak pulse current (102A). The SM6T22CAY includes automotive qualification (AEC-Q101). All maintain the same voltage protection characteristics.

Q: Why is the original P6SMB22CAT3G marked as obsolete?

A: Littelfuse has discontinued this part number. Active equivalent parts from other manufacturers provide identical functionality with current manufacturing support and improved long-term availability.

Q: Are there packaging differences between substitutes?

A: All substitute parts use the DO-214AA (SMB) surface mount package, identical to the original. Packaging formats (Tape & Reel, Cut Tape, Digi-Reel) vary by supplier but do not affect electrical or mechanical compatibility.

Q: Which substitute should I select for automotive applications?

A: The SM6T22CAY is qualified to AEC-Q101 automotive standards and is the appropriate choice for automotive applications requiring formal qualification documentation.

Q: Can I use a substitute with higher peak pulse current rating?

A: Yes. The 1KSMB22CA (1000W, 32.7A) and SM6T22CA/SM6T22CAY (102A at 8/20µs) provide equal or superior transient protection compared to the original 600W, 20A specification. These are direct upgrades in terms of surge handling capability.