15KP51CA-B Equivalent & Substitute Parts

Part Overview

The 15KP51CA-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional Zener diode features a 51V reverse standoff voltage with an 82.8V maximum clamping voltage and 181A peak pulse current capability. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

15KP51CA-B

Littelfuse Inc.In Stock: 113515KP51CA-B Datasheet

Current PartRFQ

15KPA51CA-B

Littelfuse Inc.In Stock: 103615KPA51CA-B Datasheet

DirectRFQ

5KP51CA-TP

Micro Commercial CoIn Stock: 16205KP51CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 15KP51CA-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 51V
• Voltage - Breakdown (Min): 56.7V minimum
• Voltage - Clamping (Max) @ Ipp: within acceptable range for application
• Current - Peak Pulse (10/1000µs): minimum 181A
• Power - Peak Pulse: minimum 15000W
• Operating Temperature Range: -55°C ~ 175°C

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial
• Bidirectional Channels: 1
• Type: Zener

Compliance Criteria:

• RoHS Status: ROHS3 Compliant

Substitute parts must maintain electrical performance within the specified voltage and current parameters while preserving through-hole axial mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

15KPA51CA-B (Littelfuse Inc.) - Primary Substitute

The 15KPA51CA-B is the direct successor to the 15KP51CA-B. Both parts share identical electrical specifications (51V standoff, 82.9V clamping, 15kW peak power) and mechanical compatibility (P600 axial package). The 15KPA51CA-B maintains active product status with ROHS3 compliance, making it the preferred choice for direct replacement in existing designs and new implementations requiring equivalent performance.

5KP51CA-TP (Micro Commercial Co) - Alternative Substitute

The 5KP51CA-TP provides electrical compatibility with matching voltage parameters (51V standoff, 82.4V clamping) and identical operating temperature range. However, this part operates at reduced peak pulse power (5000W versus 15000W) and uses an R-6 axial package instead of P600. The 5KP51CA-TP is suitable only for applications where peak power dissipation does not exceed 5000W and where R-6 package footprint compatibility exists. This part maintains ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can the 15KPA51CA-B be used as a direct replacement for the 15KP51CA-B?

A: Yes. The 15KPA51CA-B is electrically and mechanically equivalent to the 15KP51CA-B. Both parts feature identical 51V reverse standoff voltage, 82.8V/82.9V clamping voltage, 15kW peak power rating, and P600 axial through-hole packaging. The 15KPA51CA-B is the active production equivalent.

Q: What are the limitations of using the 5KP51CA-TP as a substitute?

A: The 5KP51CA-TP maintains voltage compatibility (51V standoff, 82.4V clamping) but operates at 5000W peak pulse power, one-third the rating of the 15KP51CA-B. Additionally, the 5KP51CA-TP uses an R-6 axial package rather than P600, requiring PCB footprint verification. Use this part only in applications where peak power dissipation remains below 5000W and R-6 package compatibility is confirmed.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 15KPA51CA-B and 5KP51CA-TP are both ROHS3 compliant, matching the compliance status of the original 15KP51CA-B.

Q: What is the primary reason for substituting the 15KP51CA-B?

A: The 15KP51CA-B is classified as obsolete. The 15KPA51CA-B is the active production equivalent and should be used for new designs and ongoing system support.

Q: Do all substitute parts operate across the same temperature range?

A: Yes. All listed substitute parts operate across the identical temperature range of -55°C to 175°C (junction temperature), ensuring thermal compatibility in equivalent applications.