P6SMBJ91 Equivalent & Substitute Parts

Part Overview

The P6SMBJ91 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 77.8V reverse standoff voltage with a 131.25V maximum clamping voltage and 4.9A peak pulse current capability in a surface-mount DO-214AA (SMB) package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMBJ91

Littelfuse Inc.In Stock: 1229P6SMBJ91 Datasheet

Current PartRFQ

P6SMB91A

Eaton - Electronics DivisionIn Stock: 30307P6SMB91A Datasheet

MFR RecommendedRFQ

SMBJP6KE91A-TP

Micro Commercial CoIn Stock: 2484SMBJP6KE91A-TP Datasheet

DirectRFQ

P6SMB91A

Eaton - Electronics DivisionIn Stock: 30307P6SMB91A Datasheet

MFR RecommendedRFQ

SMBJ70E3/TR13

Microchip TechnologyIn Stock: 823SMBJ70E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMBJ91 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Reverse standoff voltage: 77.8V (±tolerance acceptable)
• Peak pulse current: 4.9A minimum
• Clamping voltage: 125V–131.25V range
• Package type: DO-214AA / SMB surface mount
• Unidirectional channel configuration: 1 channel
• Operating temperature range: minimum -55°C to 150°C

Acceptable Variations:

• Clamping voltage up to 125V is acceptable (lower than original 131.25V but within functional tolerance for general-purpose protection)
• Breakdown voltage minimum of 86.5V is acceptable (within the 77.8V standoff specification)
• Peak pulse current of 4.8A is acceptable (marginal reduction from 4.9A)
• Extended upper operating temperature to 175°C is acceptable (exceeds original specification)

The three substitute parts listed below meet these criteria and are classified as active products with current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

P6SMB91A (Eaton - Electronics Division) is the primary recommended substitute. This part maintains identical reverse standoff voltage (77.8V), peak pulse current (4.9A), and operating temperature range (-55°C to 150°C) as the original P6SMBJ91. The clamping voltage is reduced to 125V, which remains within acceptable tolerance for general-purpose transient suppression. The part is active in production with substantial inventory availability (30,200 pcs). RoHS compliance is confirmed.

SMBJP6KE91A-TP (Micro Commercial Co) provides an alternative with identical electrical performance to P6SMB91A. This part offers an extended upper operating temperature of 175°C, providing additional thermal margin for demanding applications. ROHS3 compliance and REACH unaffected status are confirmed. Inventory is available (2,454 pcs).

SMBJ70E3/TR13 (Microchip Technology) is a secondary option with a lower reverse standoff voltage of 70V. This part is suitable only for applications where the lower voltage rating is acceptable. The peak pulse current is marginally reduced to 4.8A. Extended lower operating temperature range (-65°C) is available. ROHS3 compliance is confirmed. Inventory is limited (766 pcs).

All substitute parts maintain the DO-214AA (SMB) surface-mount package, ensuring mechanical and thermal compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91A be used as a direct replacement for P6SMBJ91?

A: Yes. P6SMB91A meets the critical substitution parameters: identical 77.8V reverse standoff voltage, 4.9A peak pulse current, 600W peak pulse power, and compatible operating temperature range. The clamping voltage reduction from 131.25V to 125V is within acceptable tolerance for general-purpose protection applications. Both parts use the DO-214AA (SMB) package.

Q: What is the difference between P6SMB91A and SMBJP6KE91A-TP?

A: Both parts share identical electrical specifications (77.8V standoff, 4.9A peak pulse, 125V clamping). The primary difference is the upper operating temperature limit: SMBJP6KE91A-TP extends to 175°C versus 150°C for P6SMB91A. SMBJP6KE91A-TP also carries REACH unaffected certification. Selection depends on thermal requirements of the application.

Q: Why is SMBJ70E3/TR13 listed as a substitute if the voltage rating is lower?

A: SMBJ70E3/TR13 is included as a secondary option for applications where a 70V reverse standoff voltage is acceptable. The lower voltage rating reduces the clamping voltage threshold, which may be suitable for lower-voltage circuit protection. This part is not recommended as a direct replacement for designs requiring 77.8V standoff protection.

Q: Are all substitute parts RoHS compliant?

A: Yes. P6SMB91A is RoHS compliant. SMBJP6KE91A-TP and SMBJ70E3/TR13 are both ROHS3 compliant, meeting the most current RoHS standards.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: All substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use these substitutes in telecom applications?

A: P6SMB91A is specifically rated for telecom applications. SMBJP6KE91A-TP and SMBJ70E3/TR13 are rated for general-purpose applications. Application-specific requirements should be verified against circuit protection specifications.