P6SMB30CAT3G Equivalent & Substitute Parts

Part Overview

The P6SMB30CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This component features a 25.6V reverse standoff voltage with a 41.4V maximum clamping voltage and 14.4A peak pulse current capability in the SMB (DO-214AA) package. The part is currently listed as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB30CAT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	25.6V
Voltage - Breakdown (Min)	28.5V
Voltage - Clamping (Max) @ Ipp	41.4V
Current - Peak Pulse (10/1000µs)	14.4A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB30CAT3G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 25.6V ± tolerance
Voltage - Clamping (Max) @ Ipp: 41.4V ± tolerance
Current - Peak Pulse (10/1000µs): minimum 14.4A
Power - Peak Pulse: 600W minimum
Bidirectional Channels: 1

Mechanical Compatibility Criteria:

Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Operating Temperature Range: must encompass -65°C to 150°C minimum

Compliance Requirements:

RoHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: direct electrical equivalents (matching all key parameters within specification tolerance) and near-equivalent alternatives (minor voltage or current variations acceptable for general-purpose applications).

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	VC (Max)	Ipp (A)	Power (W)	Temp Range (°C)	Status	RoHS
P6SMB30CAT3G	Littelfuse Inc.	25.6V	41.4V	14.4A	600W	-65 ~ 150	Obsolete	ROHS3
1KSMB30CA	Taiwan Semiconductor Corporation	25.6V	41.4V	24.2A	1000W	-55 ~ 175	Active	ROHS3
P6SMB30CA	Eaton - Electronics Division	25.6V	41.4V	14.7A	600W	-55 ~ 150	Active	RoHS
TPSMB30CA	Littelfuse Inc.	25.6V	41.4V	14.7A	600W	-65 ~ 175	Active	ROHS3
SM6T30CA-M3/52	Vishay General Semiconductor - Diodes Division	25.6V	41.5V	14.5A	600W	-65 ~ 150	Active	ROHS3
SM6T30CA-M3/5B	Vishay General Semiconductor - Diodes Division	25.6V	41.5V	14.5A	600W	-65 ~ 150	Active	ROHS3
P6SMB30CAHE3_A/H	Vishay General Semiconductor - Diodes Division	25.6V	41.4V	14.5A	600W	-65 ~ 150	Obsolete	ROHS3
SM6T30CA	STMicroelectronics	25.6V	54.6V	75A	600W	-55 ~ 150	Active	ROHS3
SMBJ26CA	EVVO Semi	26V	42.1V	14.3A	600W	-65 ~ 150	Active	ROHS3
SMBJ28CA	MDD	28V	45.4V	13.3A	600W	-50 ~ 150	Active	ROHS3

Engineering Selection Recommendations

Primary Recommended Substitutes (Direct Electrical Equivalents):

TPSMB30CA (Littelfuse Inc.) - Active status. Maintains identical voltage specifications (25.6V VWM, 41.4V VC) with marginally higher peak pulse current (14.7A vs 14.4A). Extended temperature range (-65°C to 175°C) provides superior thermal performance. ROHS3 compliant. Automotive-grade with AEC-Q101 qualification available.
P6SMB30CA (Eaton - Electronics Division) - Active status. Identical voltage and power ratings with 14.7A peak pulse current. Maintains -55°C to 150°C operating range. RoHS compliant. Suitable for telecom applications.
SM6T30CA-M3/52 and SM6T30CA-M3/5B (Vishay General Semiconductor - Diodes Division) - Active status. Voltage specifications within 0.1V of original (25.6V VWM, 41.5V VC). Peak pulse current 14.5A. Full temperature range coverage (-65°C to 150°C). ROHS3 compliant with TransZorb® series designation.

Secondary Substitutes (Enhanced Performance):

1KSMB30CA (Taiwan Semiconductor Corporation) - Active status. Maintains voltage compatibility (25.6V VWM, 41.4V VC) with significantly enhanced current handling (24.2A vs 14.4A) and power dissipation (1000W vs 600W). Extended temperature range (-55°C to 175°C). ROHS3 compliant. Suitable for applications requiring higher transient energy absorption.

Not Recommended for Direct Substitution:

SM6T30CA (STMicroelectronics) - Clamping voltage significantly elevated (54.6V vs 41.4V) with substantially higher peak pulse current (75A). Appropriate only for applications with different voltage protection requirements.
SMBJ26CA and SMBJ28CA - Voltage specifications deviate beyond acceptable tolerance (26V and 28V respectively vs 25.6V). Suitable only for applications with different voltage ratings.
P6SMB30CAHE3_A/H (Vishay) - Obsolete status eliminates long-term availability.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB30CA as a direct replacement for P6SMB30CAT3G?

A: Yes. The 1KSMB30CA maintains identical reverse standoff voltage (25.6V) and clamping voltage (41.4V) specifications. The higher peak pulse current (24.2A) and power rating (1000W) provide enhanced protection margin without compromising circuit compatibility. Both components use the DO-214AA (SMB) package and are ROHS3 compliant.

Q: What is the difference between TPSMB30CA and P6SMB30CA?

A: Both are direct electrical equivalents with 25.6V VWM and 41.4V VC ratings. TPSMB30CA (Littelfuse) offers extended temperature range (-65°C to 175°C) and automotive qualification (AEC-Q101). P6SMB30CA (Eaton) operates from -55°C to 150°C and is specified for telecom applications. Selection depends on temperature requirements and application-specific certifications.

Q: Why is SM6T30CA not recommended as a substitute?

A: SM6T30CA has a significantly higher clamping voltage (54.6V vs 41.4V) and substantially higher peak pulse current (75A vs 14.4A). These parameters indicate a different protection profile suitable for higher-voltage transient events. Using this part would alter circuit protection characteristics and is not appropriate for applications designed around 41.4V clamping.

Q: Are all substitute parts available in the same SMB package?

A: Yes. All recommended substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and PCB layout compatibility with the original P6SMB30CAT3G.

Q: What compliance certifications should I verify for my application?

A: All recommended substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. For automotive applications, verify AEC-Q101 qualification (available for TPSMB30CA). For telecom applications, confirm suitability with application-specific standards.

Q: Can I use SMBJ26CA or SMBJ28CA as alternatives?

A: These parts have different voltage ratings (26V and 28V respectively) and are not direct electrical equivalents. They are suitable only for applications with different voltage protection requirements and should not be used as substitutes for 25.6V VWM specifications.

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