P6SMB91 Equivalent & Substitute Parts

Part Overview

The P6SMB91 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a reverse standoff voltage of 77.8V and provides clamping at 131.25V with a peak pulse current rating of 4.9A. The P6SMB91 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while meeting current manufacturing and compliance standards.

Substiute Parts

P6SMB91

Littelfuse Inc.In Stock: 1008P6SMB91 Datasheet

Current PartRFQ

P6SMB91A

Eaton - Electronics DivisionIn Stock: 30307P6SMB91A Datasheet

MFR RecommendedRFQ

P6SMB91A-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 912P6SMB91A-E3/5B Datasheet

DirectRFQ

P6SMB91A

Eaton - Electronics DivisionIn Stock: 30307P6SMB91A Datasheet

MFR RecommendedRFQ

SMBJ70E3/TR13

Microchip TechnologyIn Stock: 823SMBJ70E3/TR13 Datasheet

MFR RecommendedRFQ

SMBJP6KE91A-TP

Micro Commercial CoIn Stock: 2484SMBJP6KE91A-TP Datasheet

MFR RecommendedRFQ

TVP06B910A-G

Comchip TechnologyIn Stock: 842TVP06B910A-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6SMB91 are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Reverse standoff voltage: 77.8V (±tolerance as specified by manufacturer)
• Peak pulse current: 4.9A (±tolerance as specified by manufacturer)
• Power dissipation: 600W peak pulse
• Package type: DO-214AA / SMB surface mount
• Mounting type: Surface mount
• Unidirectional configuration: Single channel

Secondary Compatibility Factors:

• Voltage clamping performance within acceptable range (125V to 131.25V)
• Operating temperature range compatibility
• RoHS and REACH compliance status
• Moisture sensitivity level (MSL 1 - Unlimited)

Parts are grouped into two categories: direct electrical equivalents with matching standoff voltage (77.8V) and alternative voltage-rated devices with compatible clamping characteristics. The SMBJ70E3/TR13 represents a lower standoff voltage option (70V) but maintains equivalent clamping voltage and current ratings, suitable for applications with lower voltage thresholds.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitutes (Direct Equivalents):

P6SMB91A (Eaton) and SMBJP6KE91A-TP (Micro Commercial Co) are the preferred direct substitutes. Both maintain the 77.8V reverse standoff voltage and 4.9A peak pulse current specifications. P6SMB91A is actively manufactured with high inventory availability (30,200 pcs) and RoHS compliance. SMBJP6KE91A-TP offers an extended operating temperature range (-55 to 175°C) and is also actively produced with substantial inventory (2,454 pcs).

Secondary Substitute (Voltage-Variant):

P6SMB91A-E3/5B (Vishay) provides direct electrical equivalence with the added benefit of extended temperature range (-65 to 150°C) and ROHS3 compliance. The clamping voltage is 125V versus the original 131.25V, representing a 4.8% reduction. This part is suitable for applications where the lower clamping voltage remains within system tolerance.

Alternative Voltage Rating:

SMBJ70E3/TR13 (Microchip) operates at a lower reverse standoff voltage of 70V but maintains equivalent clamping voltage (125V) and peak pulse current (4.8A). This part is appropriate only for applications with lower voltage thresholds and should not be used as a direct replacement without circuit analysis.

Limited Availability:

TVP06B910A-G (Comchip) lacks complete electrical parameter documentation in the provided data. This part should be selected only when other options are unavailable and after obtaining complete specifications from the manufacturer.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91A directly replace P6SMB91 in existing designs?

A: Yes. P6SMB91A maintains the critical electrical parameters: 77.8V reverse standoff voltage, 4.9A peak pulse current, and 600W peak power dissipation. The clamping voltage is 125V compared to the original 131.25V, a difference of 4.8%. For most applications, this variation is within acceptable tolerance. Verify circuit requirements before implementation.

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

A: Both parts share identical electrical specifications (77.8V standoff, 4.9A peak current, 125V clamping). SMBJP6KE91A-TP offers an extended operating temperature range of -55 to 175°C versus -55 to 150°C for P6SMB91A. Select SMBJP6KE91A-TP for applications requiring higher temperature operation.

Q: Why does SMBJ70E3/TR13 have a lower reverse standoff voltage?

A: SMBJ70E3/TR13 is a different voltage-rated device within the same product family. The 70V standoff voltage is a distinct design specification. This part is not a direct replacement and should only be used in applications specifically designed for 70V protection thresholds.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry RoHS or ROHS3 compliance certification. P6SMB91A (Eaton) is RoHS compliant. P6SMB91A-E3/5B, SMBJ70E3/TR13, SMBJP6KE91A-TP, and TVP06B910A-G are ROHS3 compliant. Verify specific compliance requirements for your application.

Q: What is the package compatibility between substitute parts?

A: All substitute parts use DO-214AA or SMB package designations, which are mechanically and electrically compatible. P6SMB91A is supplied in SMB package format. P6SMB91A-E3/5B, SMBJ70E3/TR13, SMBJP6KE91A-TP, and TVP06B910A-G use DO-214AA (SMB) package format. These packages are interchangeable in standard surface-mount PCB layouts.

Q: Which substitute has the best inventory availability?

A: P6SMB91A (Eaton) has the highest inventory with 30,200 pcs in stock. SMBJP6KE91A-TP (Micro Commercial Co) has 2,454 pcs available. P6SMB91A-E3/5B (Vishay) has 886 pcs, and SMBJ70E3/TR13 (Microchip) has 766 pcs in stock.