P4KE9.1C Equivalent & Substitute Parts

Part Overview

The P4KE9.1C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features a 7.3V reverse standoff voltage, 14.07V maximum clamping voltage, and 400W peak pulse power rating in a DO-204AL (DO-41) axial package. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P4KE9.1C

Littelfuse Inc.In Stock: 994P4KE9.1C Datasheet

Current PartRFQ

P4KE9.1CA

Taiwan Semiconductor CorporationIn Stock: 864P4KE9.1CA Datasheet

DirectRFQ

P4KE9.1CA-G

Comchip TechnologyIn Stock: 866P4KE9.1CA-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Reverse standoff voltage within the 7.3V–7.8V range
• Breakdown voltage (minimum) between 8.19V and 8.65V
• Clamping voltage (maximum) at 13.4V–14.07V
• Peak pulse current between 29.85A and 31A
• Peak pulse power rating of 400W
• Through-hole mounting in DO-204AL or DO-41 axial package
• Operating temperature range of -55°C to 150°C or higher
• ROHS3 compliance and MSL 1 rating

The substitute parts P4KE9.1CA and P4KE9.1CA-G meet these criteria and share the same base product number (P4KE9.1), ensuring functional equivalence for general-purpose transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE9.1CA and P4KE9.1CA-G are active production parts suitable for replacing the obsolete P4KE9.1C. Selection between these substitutes depends on application-specific requirements:

P4KE9.1CA (Taiwan Semiconductor Corporation) maintains identical reverse standoff voltage (7.78V) and operating temperature range (-55°C to 175°C) to the original part, with marginally higher peak pulse current (31A versus 30.6A) and lower clamping voltage (13.4V versus 14.07V). This part is supplied in Tape & Reel packaging.

P4KE9.1CA-G (Comchip Technology) provides a slightly higher reverse standoff voltage (7.8V) and identical clamping voltage and power rating, but operates to a maximum junction temperature of 150°C, which is 25°C lower than the original specification. Peak pulse current is 29.85A. This part is supplied in bulk packaging.

Both substitutes are ROHS3 compliant with MSL 1 rating and share the same base product number, confirming functional equivalence for general-purpose transient voltage suppression.

Frequently Asked Questions (FAQ)

Q: Can P4KE9.1CA and P4KE9.1CA-G be used interchangeably with P4KE9.1C?

A: Both parts meet the core electrical parameters for substitution: reverse standoff voltage within 7.3V–7.8V, clamping voltage at 13.4V–14.07V, peak pulse power of 400W, and through-hole DO-41 axial packaging. Interchangeability depends on your circuit's operating temperature requirements. If your application operates above 150°C junction temperature, P4KE9.1CA is the preferred choice.

Q: What is the difference in clamping voltage between these parts?

A: The P4KE9.1C specifies a maximum clamping voltage of 14.07V, while both P4KE9.1CA and P4KE9.1CA-G specify 13.4V. This 0.67V difference is within acceptable tolerance for general-purpose transient suppression but should be evaluated if your circuit has strict voltage limiting requirements.

Q: Are there packaging differences I should consider?

A: P4KE9.1CA is supplied in Tape & Reel (TR) format, suitable for automated assembly. P4KE9.1CA-G is supplied in bulk packaging. Both use the same DO-204AL (DO-41) axial through-hole package, so mechanical compatibility is identical.

Q: What is the operating temperature limitation for P4KE9.1CA-G?

A: P4KE9.1CA-G operates to a maximum junction temperature of 150°C, compared to 175°C for both the original P4KE9.1C and the P4KE9.1CA substitute. If your application requires operation above 150°C junction temperature, use P4KE9.1CA.

Q: Are all three parts RoHS compliant?

A: Yes. The P4KE9.1C, P4KE9.1CA, and P4KE9.1CA-G are all ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), meeting current environmental and regulatory requirements.