P6SMB20CAT3G Equivalent & Substitute Parts

Part Overview

The P6SMB20CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This part operates with a 17.1V reverse standoff voltage and 27.7V maximum clamping voltage, delivering 22A peak pulse current in a compact SMB (DO-214AA) package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar electrical performance characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB20CAT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	17.1V
Voltage - Breakdown (Min)	19V
Voltage - Clamping (Max) @ Ipp	27.7V
Current - Peak Pulse (10/1000µs)	22A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB20CAT3G is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 17.1V ± tolerance
Voltage - Clamping (Max) @ Ipp: 27.7V ± tolerance
Current - Peak Pulse (10/1000µs): 22A minimum
Power - Peak Pulse: 600W minimum
Package / Case: DO-214AA (SMB) surface mount
Bidirectional Channels: 1
Type: Zener diode

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications (17.1V standoff, 27.7V clamping, 22A peak pulse) with active product status and full compliance certifications.

Functional Alternatives provide equivalent or superior electrical performance within acceptable tolerance ranges while maintaining the same package form factor and surface mount compatibility. These parts may have slightly different peak pulse current ratings or clamping voltages within the operational envelope of the original design.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
P6SMB20CAT3G	Littelfuse Inc.	17.1V	27.7V	22A	600W	-65°C ~ 150°C	Obsolete	DO-214AA, SMB
1KSMB20CA	Taiwan Semiconductor Corporation	17.1V	27.7V	36.1A	1000W	-55°C ~ 175°C	Active	DO-214AA, SMB
P6SMB20CA	Eaton - Electronics Division	17.1V	27.7V	21.7A	600W	-55°C ~ 150°C	Active	DO-214AA, SMB
SMBJ16CA	EVVO Semi	16V	26V	23.1A	600W	-65°C ~ 150°C	Active	DO-214AA, SMB
SMBJ18CA	MDD	18V	29.2V	20.6A	600W	-50°C ~ 150°C	Active	DO-214AA, SMB
TPSMB20CA	Littelfuse Inc.	17.1V	27.7V	22A	600W	-65°C ~ 175°C	Active	DO-214AA, SMB
P6SMB20CA-E3/52	Vishay General Semiconductor - Diodes Division	17.1V	27.7V	21.7A	600W	-65°C ~ 150°C	Active	DO-214AA, SMB
SMBJP6KE20CA-TP	Micro Commercial Co	17.1V	27.7V	22A	600W	-55°C ~ 175°C	Active	DO-214AA, SMB

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

The following parts provide identical electrical specifications and are recommended as primary replacements:

TPSMB20CA (Littelfuse Inc.): Maintains exact electrical parameters with extended upper operating temperature to 175°C. Active product status with AEC-Q101 automotive qualification. Identical 22A peak pulse current and 27.7V clamping voltage.
SMBJP6KE20CA-TP (Micro Commercial Co): Exact electrical match with 17.1V standoff, 27.7V clamping, and 22A peak pulse. Extended temperature range to 175°C. Active status with full compliance certifications.
P6SMB20CA-E3/52 (Vishay General Semiconductor - Diodes Division): Maintains identical 17.1V standoff and 27.7V clamping specifications. Active product with ROHS3 compliance. Operates across -65°C to 150°C temperature range.

Secondary Substitutes (Functional Alternatives)

These parts provide equivalent or superior performance within acceptable operational parameters:

P6SMB20CA (Eaton - Electronics Division): Identical voltage specifications (17.1V standoff, 27.7V clamping) with 21.7A peak pulse current (within tolerance of 22A). Active status with high inventory availability. Suitable for telecom applications.
1KSMB20CA (Taiwan Semiconductor Corporation): Exceeds original specifications with 36.1A peak pulse current and 1000W power rating. Maintains identical 17.1V standoff and 27.7V clamping voltages. Extended temperature range to 175°C. Active product status.

Marginal Alternatives (Voltage Deviation)

SMBJ16CA (EVVO Semi): 16V standoff and 26V clamping represent lower voltage protection threshold. Suitable only if circuit design permits reduced protection margin.
SMBJ18CA (MDD): 18V standoff and 29.2V clamping represent higher voltage threshold. Suitable only if circuit design accommodates increased clamping voltage.

All substitute parts maintain DO-214AA (SMB) package compatibility, surface mount mounting type, and ROHS3 compliance. Selection should be based on specific circuit requirements, temperature operating range, and available inventory.

Frequently Asked Questions (FAQ)

Q: Can I use TPSMB20CA as a direct replacement for P6SMB20CAT3G?

A: Yes. TPSMB20CA provides identical electrical specifications: 17.1V reverse standoff voltage, 27.7V maximum clamping voltage, and 22A peak pulse current. Both use DO-214AA (SMB) surface mount packaging. TPSMB20CA is an active product with extended temperature range (-65°C to 175°C) and AEC-Q101 automotive qualification.

Q: What is the difference between P6SMB20CA and P6SMB20CA-E3/52?

A: Both parts share identical electrical specifications and are manufactured by different suppliers (Eaton vs. Vishay). P6SMB20CA-E3/52 is the Vishay variant with TransZorb® series designation. Electrical performance is equivalent: 17.1V standoff, 27.7V clamping, 21.7A peak pulse. Both are active products with ROHS3 compliance.

Q: Is 1KSMB20CA a suitable substitute despite higher current rating?

A: Yes. 1KSMB20CA maintains identical voltage specifications (17.1V standoff, 27.7V clamping) while providing superior current handling (36.1A vs. 22A) and power dissipation (1000W vs. 600W). Higher ratings do not compromise circuit compatibility; the part operates within the same voltage protection envelope. This is a functional upgrade suitable for designs requiring enhanced transient protection margin.

Q: Can I substitute SMBJ16CA or SMBJ18CA for the original part?

A: These parts represent voltage deviations from the original specification. SMBJ16CA operates at 16V standoff (1.1V lower) and 26V clamping (1.7V lower). SMBJ18CA operates at 18V standoff (0.9V higher) and 29.2V clamping (1.5V higher). Substitution is only acceptable if circuit design analysis confirms the modified voltage thresholds remain within acceptable protection parameters.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use DO-214AA (SMB) surface mount package. Mechanical compatibility with existing PCB layouts and pick-and-place equipment is maintained across all alternatives.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected. TPSMB20CA carries additional AEC-Q101 automotive qualification. Specific compliance requirements for your application should be verified against individual part datasheets.

Q: Why is the original P6SMB20CAT3G obsolete?

A: Product obsolescence is determined by manufacturer lifecycle decisions. Active alternatives with identical or superior specifications are available from multiple manufacturers, ensuring design continuity and supply chain flexibility.

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