P6SMB51CAT3G Equivalent & Substitute Parts

Part Overview

The P6SMB51CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This bidirectional Zener diode features a 43.6V reverse standoff voltage and 70.1V clamping voltage with 8.6A peak pulse current capability in a DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43.6	V
Voltage - Breakdown (Min)	48.5	V
Voltage - Clamping (Max) @ Ipp	70.1	V
Current - Peak Pulse (10/1000µs)	8.6	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65°C ~ 150°C	TJ
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB51CAT3G is determined by strict alignment with the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 43.6V
Voltage - Breakdown (Min): 48.5V
Voltage - Clamping (Max) @ Ipp: 70.1V
Package / Case: DO-214AA, SMB
Type: Zener, Bidirectional
RoHS Status: ROHS3 Compliant

Substitute parts must maintain these core specifications to ensure functional equivalence in circuit protection applications. Peak pulse current and power dissipation may vary within acceptable ranges for the same voltage class, provided the package and electrical protection characteristics remain consistent.

Parameter Comparison

Parameter	P6SMB51CAT3G (Littelfuse)	1KSMB51CA (Taiwan Semiconductor)	P6SMB51CA (Good-Ark)	P6SMB51CA-E3/5B (Vishay)	SMBJP6KE51CA-TP (Micro Commercial)	TVP06B510CA-G (Comchip)
Voltage - Reverse Standoff (Typ)	43.6V	43.6V	43.6V	43.6V	43.6V	—
Voltage - Breakdown (Min)	48.5V	48.5V	48.5V	48.5V	48.5V	—
Voltage - Clamping (Max) @ Ipp	70.1V	70.1V	70.1V	70.1V	70.1V	—
Current - Peak Pulse (10/1000µs)	8.6A	14.3A	8.6A	8.6A	8.7A	—
Power - Peak Pulse	600W	1000W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMBJ	DO-214AA, SMB
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts maintain ROHS3 compliance and active product status, ensuring regulatory alignment and long-term supply availability compared to the obsolete P6SMB51CAT3G.

1KSMB51CA (Taiwan Semiconductor Corporation) provides enhanced performance with 14.3A peak pulse current and 1000W power dissipation, supporting higher transient energy absorption while maintaining identical voltage specifications. Extended operating temperature range (-55°C ~ 175°C) accommodates broader environmental conditions.

P6SMB51CA (Good-Ark Semiconductor) delivers direct electrical equivalence with 8.6A peak pulse current and 600W power dissipation, matching the original part's performance envelope. Active status ensures continued availability.

P6SMB51CA-E3/5B (Vishay General Semiconductor - Diodes Division) offers electrical equivalence with TransZorb® series designation and maintains the original -65°C lower temperature limit, providing compatibility for low-temperature applications.

SMBJP6KE51CA-TP (Micro Commercial Co) supplies equivalent protection with 8.7A peak pulse current and extended operating temperature range (-55°C ~ 175°C), utilizing SMBJ package variant within the DO-214AA family.

TVP06B510CA-G (Comchip Technology) maintains 600W power dissipation and DO-214AA package compatibility. Incomplete electrical parameter documentation limits detailed comparison; verification against application requirements is necessary.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB51CA as a direct replacement for P6SMB51CAT3G?

A: Yes. The 1KSMB51CA maintains all critical voltage specifications (43.6V standoff, 48.5V breakdown, 70.1V clamping) and package compatibility (DO-214AA, SMB). The higher peak pulse current (14.3A vs. 8.6A) and power rating (1000W vs. 600W) provide enhanced transient protection without compromising circuit function.

Q: What is the difference between SMB and SMBJ packages?

A: Both SMB and SMBJ are DO-214AA package variants. SMBJ typically features enhanced mechanical robustness and current handling. SMBJP6KE51CA-TP uses the SMBJ variant while maintaining electrical equivalence and footprint compatibility with standard SMB applications.

Q: Why is the P6SMB51CAT3G marked as obsolete?

A: Obsolescence reflects manufacturer discontinuation. Active substitute parts listed provide equivalent or superior electrical performance with assured long-term supply and regulatory compliance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 Compliant certification, ensuring regulatory alignment with current environmental and hazardous substance restrictions.

Q: What parameters must remain constant for substitution?

A: Voltage - Reverse Standoff (43.6V), Voltage - Breakdown (48.5V), Voltage - Clamping (70.1V), Package (DO-214AA, SMB), and Type (Zener, Bidirectional) must remain constant. Peak pulse current and power dissipation may increase without affecting circuit protection function.

Q: Can I use TVP06B510CA-G if electrical parameters are not fully specified?

A: TVP06B510CA-G maintains 600W power dissipation and DO-214AA package compatibility. Incomplete voltage parameter documentation requires verification against application datasheet specifications before selection.

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