P6KE91 Equivalent & Substitute Parts

Part Overview

The P6KE91 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a DO-204AC (DO-15) axial package configuration with a 600W peak pulse power rating and operates across a temperature range of -55°C to 175°C.

The P6KE91 is classified as obsolete, which necessitates identification of functionally equivalent substitute components for new designs and ongoing system support. Substitute parts must maintain electrical compatibility across critical parameters including reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse power rating, while accommodating the through-hole mounting requirement.

Substiute Parts

P6KE91

Littelfuse Inc.In Stock: 1129P6KE91 Datasheet

Current PartRFQ

P6KE91A

Fairchild SemiconductorIn Stock: 32302P6KE91A Datasheet

MFR RecommendedRFQ

P6KE91A

Fairchild SemiconductorIn Stock: 32302P6KE91A Datasheet

MFR RecommendedRFQ

P6KE91A-B

Littelfuse Inc.In Stock: 859P6KE91A-B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P6KE91 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Reverse Standoff Voltage (Typ): 77.8V
• Peak Pulse Power Rating: 600W
• Unidirectional Channel Configuration: 1 channel
• Mounting Type: Through Hole
• Package Type: DO-204AC / DO-15 Axial

Allowable Variation Parameters:

• Voltage - Breakdown (Min): Substitute must meet or exceed 81.9V minimum
• Voltage - Clamping (Max) @ Ipp: Substitute must not exceed 131.25V maximum
• Current - Peak Pulse (10/1000µs): Substitute must support 600W peak pulse power

The identified substitute parts P6KE91A (Fairchild Semiconductor) and P6KE91A-B (Littelfuse Inc.) maintain identical reverse standoff voltage (77.8V) and peak pulse power rating (600W), with clamping voltages of 125V, which falls within the acceptable range. Both substitutes retain the through-hole DO-15 axial package configuration and unidirectional topology required for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

P6KE91A-B (Littelfuse Inc.) - Primary Substitute

The P6KE91A-B is the preferred substitute for the obsolete P6KE91. This component is manufactured by the original equipment supplier (Littelfuse Inc.), maintains active product status, and provides full electrical compatibility. The part carries identical reverse standoff voltage (77.8V), peak pulse power rating (600W), and operating temperature range (-55°C to 175°C). The clamping voltage of 125V is lower than the original 131.25V specification, providing improved transient suppression performance. ROHS3 compliance and REACH unaffected status confirm regulatory alignment for current manufacturing standards.

P6KE91A (Fairchild Semiconductor) - Secondary Substitute

The P6KE91A from Fairchild Semiconductor provides electrical equivalence with matching reverse standoff voltage (77.8V) and peak pulse power rating (600W). However, this part is classified as obsolete and lacks specified operating temperature range data. The clamping voltage of 125V matches the P6KE91A-B specification. This substitute is suitable only when P6KE91A-B availability is constrained and design requirements do not mandate documented temperature performance specifications.

Frequently Asked Questions (FAQ)

Q: Can P6KE91A-B be used as a direct replacement for P6KE91 in existing designs?

A: Yes. The P6KE91A-B maintains identical reverse standoff voltage (77.8V), peak pulse power rating (600W), and through-hole DO-15 axial package configuration. The lower clamping voltage (125V vs. 131.25V) represents improved transient suppression without compromising circuit protection. No circuit modifications are required.

Q: What is the difference between P6KE91A and P6KE91A-B?

A: Both parts share identical electrical specifications for reverse standoff voltage (77.8V), breakdown voltage (86.5V minimum), clamping voltage (125V), and peak pulse power rating (600W). The primary distinction is product status: P6KE91A-B is active and manufactured by Littelfuse Inc., while P6KE91A is obsolete and manufactured by Fairchild Semiconductor. P6KE91A-B also provides documented operating temperature range (-55°C to 175°C).

Q: Are there any package compatibility concerns when substituting these parts?

A: No. All three parts (P6KE91, P6KE91A, P6KE91A-B) use the DO-204AC (DO-15) axial through-hole package. Physical dimensions and lead spacing are identical, ensuring direct PCB compatibility without layout modifications.

Q: What compliance certifications apply to these substitute parts?

A: Both P6KE91A and P6KE91A-B are ROHS3 compliant. P6KE91A-B additionally carries REACH unaffected status, confirming compliance with current environmental and hazardous substance regulations. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: Why is the clamping voltage lower in the substitute parts?

A: The P6KE91A and P6KE91A-B specify a maximum clamping voltage of 125V compared to the original P6KE91 specification of 131.25V. This represents a design improvement that provides faster transient suppression and lower voltage clamping, which enhances circuit protection performance without affecting compatibility with the 77.8V reverse standoff voltage requirement.

Q: Which substitute should be selected for new production designs?

A: P6KE91A-B is the recommended selection for new production designs. This part is actively manufactured by Littelfuse Inc., carries active product status, and provides complete technical documentation including operating temperature specifications. Inventory availability (839 pcs) supports production requirements.