P6SMB91A Equivalent & Substitute Parts

Part Overview

The P6SMB91A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates in the 77.8V reverse standoff voltage range with a 125V maximum clamping voltage and 4.9A peak pulse current capability. The part is actively produced and ROHS3 compliant, making it suitable for modern electronic designs requiring transient suppression in industrial and commercial applications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

P6SMB91A

Littelfuse Inc.In Stock: 30300P6SMB91A Datasheet

Current PartRFQ

SMBJ78A

MDDIn Stock: 9439SMBJ78A Datasheet

MFR RecommendedRFQ

SMBJP6KE91A-TP

Micro Commercial CoIn Stock: 2484SMBJP6KE91A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB91A is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 77.8V ± tolerance
• Voltage - Breakdown (Min): 86.5V or higher
• Voltage - Clamping (Max) @ Ipp: 125V or lower
• Current - Peak Pulse (10/1000µs): 4.9A or higher
• Power - Peak Pulse: 600W or higher

Mechanical Compatibility Criteria:

• Package / Case: DO-214AA or SMB equivalent
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance Requirements:

• Product Status: Active
• RoHS Status: ROHS3 Compliant

Two substitute parts meet these criteria and are grouped as follows:

Group 1 - Direct Electrical Equivalent: SMBJP6KE91A-TP (Micro Commercial Co) provides identical electrical specifications with extended operating temperature range (-55°C ~ 175°C).

Group 2 - Functional Equivalent: SMBJ78A (MDD) provides comparable electrical performance with minor parameter variations within acceptable substitution tolerances.

Parameter Comparison

Engineering Selection Recommendations

SMBJP6KE91A-TP is the primary substitute for P6SMB91A. This part maintains identical electrical specifications across all critical parameters and offers an extended maximum operating temperature of 175°C compared to the original 150°C. Both parts are ROHS3 compliant and actively produced, ensuring long-term availability and regulatory compliance.

SMBJ78A serves as a secondary functional equivalent. Parameter variations are within acceptable engineering tolerances: reverse standoff voltage differs by 0.2V (78V vs. 77.8V), clamping voltage by 1V (126V vs. 125V), and peak pulse current by 0.1A (4.8A vs. 4.9A). The minimum operating temperature is -50°C versus -55°C for the original part. This part is suitable for applications where the tighter temperature range and marginally reduced current capacity do not present constraints. ROHS3 compliance is confirmed.

Both substitutes maintain the DO-214AA/SMB package footprint and surface-mount configuration, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SMBJP6KE91A-TP be used as a direct replacement for P6SMB91A?

A: Yes. SMBJP6KE91A-TP provides identical electrical performance across all critical parameters: 77.8V reverse standoff, 125V clamping voltage, and 4.9A peak pulse current. The extended operating temperature range (-55°C ~ 175°C) offers additional thermal margin. Both parts use the DO-214AA/SMB package and are ROHS3 compliant.

Q: What are the differences between SMBJ78A and P6SMB91A?

A: SMBJ78A differs in three parameters: reverse standoff voltage (78V vs. 77.8V), clamping voltage (126V vs. 125V), and peak pulse current (4.8A vs. 4.9A). The minimum operating temperature is -50°C instead of -55°C. These variations remain within acceptable substitution tolerances for general-purpose transient suppression applications. Package and mounting type are identical.

Q: Are all substitute parts in the same package?

A: Yes. P6SMB91A, SMBJP6KE91A-TP, and SMBJ78A all use the DO-214AA/SMB surface-mount package. No PCB layout modifications are required when substituting between these parts.

Q: Do the substitute parts meet RoHS compliance?

A: Yes. Both SMBJP6KE91A-TP and SMBJ78A are ROHS3 compliant, matching the compliance status of the original P6SMB91A.

Q: Which substitute should be selected for high-temperature applications?

A: SMBJP6KE91A-TP is recommended for applications requiring operation above 150°C, as it supports temperatures up to 175°C. P6SMB91A and SMBJ78A are rated to 150°C and -50°C minimum respectively.

Q: Can SMBJ78A be used in applications requiring the full 4.9A peak pulse current?

A: SMBJ78A is rated for 4.8A peak pulse current, which is 0.1A lower than P6SMB91A. Applications requiring the full 4.9A specification should use P6SMB91A or SMBJP6KE91A-TP.