P4KE9.1 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The P4KE9.1 is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-204AL (DO-41) axial package designed for general-purpose transient protection applications. Manufactured by Littelfuse Inc., this component operates across a junction temperature range of -55°C to 175°C and provides 400W peak pulse power dissipation. The P4KE9.1 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

P4KE9.1

Littelfuse Inc.In Stock: 1111P4KE9.1 Datasheet

Current PartRFQ

P4KE9.1A

Taiwan Semiconductor CorporationIn Stock: 863P4KE9.1A Datasheet

DirectRFQ

P4KE9.1A-G

Comchip TechnologyIn Stock: 968P4KE9.1A-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4KE9.1 are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 7.78V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 13.4V to 14.07V range
• Current - Peak Pulse (10/1000µs): 29.85A to 31A range
• Power - Peak Pulse: 400W
• Package / Case: DO-204AL or DO-41 axial configuration
• Mounting Type: Through Hole
• Type: Zener, Unidirectional

Both substitute parts maintain electrical compatibility within the specified parameter windows and preserve the through-hole axial package form factor required for direct board-level replacement.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE9.1A (Taiwan Semiconductor Corporation) and P4KE9.1A-G (Comchip Technology) are active product alternatives to the obsolete P4KE9.1. Selection between these substitutes should be based on the following factors:

P4KE9.1A offers identical reverse standoff voltage (7.78V) and maintains the full operating temperature range (-55°C to 175°C). This part is available in Tape & Reel packaging and carries ROHS3 compliance with REACH Unaffected status.

P4KE9.1A-G provides a marginally higher reverse standoff voltage (7.8V) with a reduced upper operating temperature limit of 150°C. This part is available in Bulk packaging and also carries ROHS3 compliance with REACH Unaffected status.

Both parts maintain the required 400W peak pulse power rating and through-hole axial package configuration. The clamping voltage differential (13.4V versus 14.07V) falls within acceptable substitution tolerance for general-purpose transient protection applications.

Frequently Asked Questions (FAQ)

Q: Can P4KE9.1A and P4KE9.1A-G be used interchangeably with the original P4KE9.1?

A: Both parts are electrically compatible substitutes within the specified parameter windows. The clamping voltage and peak pulse current values remain within acceptable ranges for the P4KE9.1 application envelope. Physical package compatibility (DO-204AL/DO-41 axial through-hole) is preserved across all three parts.

Q: What is the significance of the clamping voltage difference between P4KE9.1 (14.07V) and the substitutes (13.4V)?

A: The lower clamping voltage in P4KE9.1A and P4KE9.1A-G provides more aggressive transient suppression, which is acceptable for general-purpose protection circuits. This represents a tighter voltage regulation characteristic and does not compromise compatibility.

Q: Does the operating temperature range difference affect substitution suitability?

A: P4KE9.1A maintains the full -55°C to 175°C range of the original part. P4KE9.1A-G operates to 150°C maximum. Selection depends on application requirements. If the circuit operates above 150°C junction temperature, P4KE9.1A is the appropriate choice.

Q: Are packaging differences between Tape & Reel and Bulk significant?

A: Packaging format (Tape & Reel versus Bulk) affects procurement and handling but does not impact electrical performance or board-level compatibility. Both formats contain identical components in the same DO-204AL/DO-41 axial package.

Q: What compliance certifications apply to these substitute parts?

A: All three parts (original and substitutes) are ROHS3 compliant. P4KE9.1A and P4KE9.1A-G carry REACH Unaffected status, confirming regulatory alignment for industrial and commercial applications.