5KP51CA-B Equivalent & Substitute Parts

Part Overview

The 5KP51CA-B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This through-hole component features a 51V reverse standoff voltage with an 82.4V maximum clamping voltage and 61.9A peak pulse current capability at 5000W peak pulse power. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when circuit designs require alternative packaging formats, different manufacturers, or modified electrical characteristics within acceptable operating parameters for the application.

Substiute Parts

5KP51CA-B

LittelfuseIn Stock: 7045KP51CA-B Datasheet

Current PartRFQ

1.5KE62CA

Taiwan Semiconductor CorporationIn Stock: 251501.5KE62CA Datasheet

MFR RecommendedRFQ

1.5KE68CA

Taiwan Semiconductor CorporationIn Stock: 150231.5KE68CA Datasheet

MFR RecommendedRFQ

P6KE68CA

Fairchild SemiconductorIn Stock: 17468P6KE68CA Datasheet

MFR RecommendedRFQ

5KP51CA-TP

Micro Commercial CoIn Stock: 16205KP51CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the 5KP51CA-B is based on the following criteria:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 51V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 82.4V ± tolerance
• Bidirectional operation (1 channel)
• Through-hole axial mounting
• Zener type TVS diode
• General-purpose applications
• RoHS3 compliance

Secondary Considerations:

• Peak pulse current capability (61.9A nominal)
• Peak pulse power rating (5000W nominal)
• Operating temperature range (-55°C to 175°C)
• Packaging format (P600, DO-201, DO-15)

Substitute parts are grouped by their ability to maintain the specified voltage protection window while accommodating variations in current handling and packaging. Parts with identical voltage characteristics but different current ratings or package styles remain functionally equivalent for applications where the peak pulse current requirement is not exceeded.

Parameter Comparison

Engineering Selection Recommendations

5KP51CA-TP (Micro Commercial Co) — Direct equivalent with identical electrical specifications (51V standoff, 82.4V clamping, 5000W peak power). Differs only in packaging format (R-6 vs. P600) and supplier. Maintains RoHS3 compliance and full temperature range. Suitable for direct substitution where R-6 package footprint is acceptable.

1.5KE62CA (Taiwan Semiconductor) — Functionally equivalent for voltage protection with 53V standoff and 85V clamping voltage. Reduced peak pulse current (18A vs. 61.9A) and power rating (1500W vs. 5000W) limit application to lower-energy transient events. DO-201 package requires PCB layout modification. RoHS3 compliant. Suitable for applications with reduced surge current requirements.

1.5KE68CA (Taiwan Semiconductor) — Higher voltage variant with 58.1V standoff and 92V clamping. Reduced peak pulse current (17A) and power rating (1500W). DO-201 package requires layout modification. RoHS3 compliant. Applicable only when higher clamping voltage is required and peak pulse current does not exceed 17A.

P6KE68CA (Fairchild Semiconductor) — Highest voltage variant (58.1V standoff, 92V clamping) with lowest current capability (6.8A) and power rating (600W). DO-15 package is smallest form factor. Minimum operating temperature -50°C (vs. -55°C for main part). Suitable only for low-energy transient protection with higher voltage requirements.

All substitute parts maintain Active product status and general-purpose application classification. Selection depends on specific circuit peak pulse current requirements and available PCB space for package accommodation.

Frequently Asked Questions (FAQ)

Q: Can 1.5KE62CA replace 5KP51CA-B in all applications?

A: No. While voltage characteristics are similar (53V vs. 51V standoff), the 1.5KE62CA has significantly reduced peak pulse current (18A vs. 61.9A) and power rating (1500W vs. 5000W). Substitution is valid only for applications where transient surge current does not exceed 18A.

Q: What is the primary difference between 5KP51CA-B and 5KP51CA-TP?

A: Both parts have identical electrical specifications (51V standoff, 82.4V clamping, 61.9A peak pulse, 5000W power). The difference is packaging: 5KP51CA-B uses P600 package while 5KP51CA-TP uses R-6 package. Both are RoHS3 compliant and maintain the same temperature range.

Q: Why do 1.5KE68CA and P6KE68CA have higher clamping voltages?

A: These parts are designed for higher voltage protection circuits. The 1.5KE68CA provides 92V clamping with 17A peak pulse current, while P6KE68CA provides the same voltage with only 6.8A current. Selection depends on the specific circuit voltage level and transient energy.

Q: Are all substitute parts RoHS3 compliant?

A: The 5KP51CA-B, 5KP51CA-TP, 1.5KE62CA, and 1.5KE68CA are all RoHS3 compliant. The P6KE68CA does not list RoHS status in the provided specifications.

Q: Can I use P6KE68CA as a direct replacement for 5KP51CA-B?

A: No. While both are through-hole axial diodes, the P6KE68CA has significantly lower peak pulse current (6.8A vs. 61.9A) and power rating (600W vs. 5000W). It is suitable only for applications with substantially lower transient energy requirements.

Q: What package considerations apply when substituting parts?

A: The 5KP51CA-B uses P600 package. Substitutes use R-6 (5KP51CA-TP), DO-201 (1.5KE62CA, 1.5KE68CA), or DO-15 (P6KE68CA) packages. PCB layout and lead spacing must accommodate the selected package. All are through-hole axial components suitable for standard PCB mounting.

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

A: The 5KP51CA-B, 5KP51CA-TP, 1.5KE62CA, and 1.5KE68CA operate from -55°C to 175°C. The P6KE68CA operates from -50°C to 175°C, with a 5°C higher minimum temperature limit.