P4KE170C-B Equivalent & Substitute Parts

Part Overview

The P4KE170C-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 145V reverse standoff voltage with a 245.7V maximum clamping voltage and 1.8A peak pulse current capability in a DO-204AL (DO-41) through-hole package. The part is currently classified as obsolete, making identification of functionally equivalent active alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

P4KE170C-B

Littelfuse Inc.In Stock: 1002P4KE170C-B Datasheet

Current PartRFQ

P4KE170CA

Taiwan Semiconductor CorporationIn Stock: 1172P4KE170CA Datasheet

DirectRFQ

P4KE170CA-B

Littelfuse Inc.In Stock: 1095P4KE170CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4KE170C-B is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 145V (nominal)
• Voltage - Clamping (Max) @ Ipp: within acceptable tolerance range
• Current - Peak Pulse (10/1000µs): 1.8A minimum
• Power - Peak Pulse: 400W minimum
• Package / Case: DO-204AL (DO-41) through-hole configuration
• Operating Temperature Range: -55°C to 175°C (TJ)
• Type: Zener diode, unidirectional (1 channel)

The identified substitute parts P4KE170CA and P4KE170CA-B maintain identical reverse standoff voltage, peak pulse current, power dissipation, package configuration, and operating temperature specifications. Both parts are manufactured within the P4KE series base product family, ensuring mechanical and electrical compatibility. The primary distinction between substitutes is clamping voltage tolerance and product status (active vs. obsolete).

Parameter Comparison

Engineering Selection Recommendations

Both P4KE170CA and P4KE170CA-B are active, production-status alternatives to the obsolete P4KE170C-B. Selection between these substitutes should be based on procurement and packaging requirements:

P4KE170CA (Taiwan Semiconductor Corporation) is supplied in Tape & Reel format and maintains ROHS3 compliance with REACH Unaffected status. This variant is suitable for automated assembly processes and high-volume production environments.

P4KE170CA-B (Littelfuse Inc.) is supplied in bulk packaging and maintains ROHS3 compliance with REACH Unaffected status. This variant preserves the original manufacturer lineage and is suitable for manual assembly or lower-volume applications.

Both substitutes exhibit lower maximum clamping voltage (234V vs. 245.7V) while maintaining identical reverse standoff voltage and peak pulse current specifications. This represents a tighter clamping characteristic that remains within the functional operating envelope for general-purpose transient suppression applications.

Frequently Asked Questions (FAQ)

Q: Can P4KE170CA or P4KE170CA-B be used as direct replacements for P4KE170C-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 DO-204AL package configuration. The clamping voltage difference (234V vs. 245.7V) represents a tighter suppression characteristic within acceptable tolerance for general-purpose applications.

Q: What is the difference between P4KE170CA and P4KE170CA-B?

A: The primary differences are manufacturer and packaging format. P4KE170CA is manufactured by Taiwan Semiconductor Corporation and supplied in Tape & Reel format. P4KE170CA-B is manufactured by Littelfuse Inc. and supplied in bulk packaging. Electrical specifications are identical.

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

A: The substitute parts (P4KE170CA and P4KE170CA-B) specify a maximum clamping voltage of 234V compared to 245.7V in the original P4KE170C-B. This represents a tighter clamping tolerance within the same voltage class and does not affect functional compatibility for general-purpose transient suppression.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both P4KE170CA and P4KE170CA-B are ROHS3 compliant. P4KE170CA-B carries REACH Unaffected status, and P4KE170CA carries REACH Unaffected status.

Q: Which substitute should be selected for automated assembly?

A: P4KE170CA is supplied in Tape & Reel format, making it suitable for automated pick-and-place assembly processes. P4KE170CA-B is supplied in bulk packaging and is better suited for manual assembly or lower-volume applications.

Q: Is the DO-204AL package identical across all three parts?

A: Yes. All three parts (P4KE170C-B, P4KE170CA, and P4KE170CA-B) use the DO-204AL (DO-41) axial through-hole package, ensuring mechanical compatibility in existing PCB designs without layout modifications.