P4KE170-B Equivalent & Substitute Parts

Part Overview

The P4KE170-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional zener diode operates in the DO-204AL (DO-41) through-hole package and provides clamping at 245.7V with a peak pulse current rating of 1.8A. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P4KE170-B

Littelfuse Inc.In Stock: 796P4KE170-B Datasheet

Current PartRFQ

P4KE170A

Taiwan Semiconductor CorporationIn Stock: 1050P4KE170A Datasheet

DirectRFQ

P4KE170A-B

Littelfuse Inc.In Stock: 713P4KE170A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4KE170-B is determined by strict equivalence across the following critical parameters:

• Reverse standoff voltage: 145V (nominal)
• Peak pulse current capability: 1.8A
• Package type: DO-204AL (DO-41) through-hole axial
• Zener type: Unidirectional, single channel
• Operating temperature range: -55°C to 175°C
• Power dissipation: 400W peak pulse

The substitute parts P4KE170A and P4KE170A-B maintain these core electrical and mechanical specifications. Both are members of the P4KE series and share the same base product number (P4KE170), ensuring functional compatibility within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

Both P4KE170A and P4KE170A-B are active production parts suitable for replacing the obsolete P4KE170-B. Selection between the two substitutes is based on packaging and procurement requirements:

P4KE170A (Taiwan Semiconductor Corporation) is supplied in Tape & Reel (TR) packaging, appropriate for automated assembly and high-volume production environments.

P4KE170A-B (Littelfuse Inc.) is supplied in Bulk packaging, suitable for manual assembly, prototyping, or lower-volume applications. This option maintains the original manufacturer (Littelfuse Inc.) for design continuity.

Both parts meet ROHS3 compliance and carry MSL 1 (unlimited moisture sensitivity), ensuring compatibility with standard manufacturing and storage conditions. The clamping voltage differential (245.7V for P4KE170-B versus 234V for both substitutes) falls within acceptable tolerance for general-purpose transient suppression applications operating within the specified 145V standoff voltage envelope.

Frequently Asked Questions (FAQ)

Q: Can P4KE170A and P4KE170A-B be used interchangeably with P4KE170-B?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (145V), peak pulse current (1.8A), power dissipation (400W), operating temperature range (-55°C to 175°C), and package configuration (DO-204AL through-hole axial). The primary difference is packaging format (Tape & Reel versus Bulk) and manufacturer source.

Q: What is the significance of the clamping voltage difference between P4KE170-B (245.7V) and the substitutes (234V)?

A: Both values fall within the acceptable operating envelope for a 145V standoff voltage TVS diode. The 11.7V difference represents normal manufacturing tolerance variation within the P4KE170 series specification. Selection depends on the specific transient suppression requirement of the application.

Q: Are there any compliance or certification differences between the three parts?

A: All three parts are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating. Both substitutes carry REACH Unaffected status. No compliance barriers exist for substitution.

Q: Does the packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Bulk packaging formats do not alter the electrical characteristics of the component. Packaging selection is driven by assembly process requirements and procurement volume.

Q: What is the base product number significance?

A: All three parts share the base product number P4KE170, indicating they are members of the same product family with equivalent core specifications. Suffix designations (-B, -A, -A-B) indicate manufacturer variants and packaging options within this family.