5KP51A-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP51A-B is an active Littelfuse Inc. unidirectional Zener TVS diode designed for general-purpose transient voltage suppression applications. This through-hole component features a 51V reverse standoff voltage with 82.4V maximum clamping voltage and 5000W peak pulse power rating. The part is ROHS3 compliant and maintains unlimited moisture sensitivity level (MSL 1). Substitute parts are necessary when addressing packaging constraints, supply chain availability, or specific mounting requirements while maintaining equivalent electrical performance within the defined parameter ranges.

Substiute Parts

5KP51A-B

Littelfuse Inc.In Stock: 11505KP51A-B Datasheet

Current PartRFQ

1.5KE62A

Taiwan Semiconductor CorporationIn Stock: 3002501.5KE62A Datasheet

MFR RecommendedRFQ

1.5KE68A

MeritekIn Stock: 371261.5KE68A Datasheet

MFR RecommendedRFQ

5KP51A

LittelfuseIn Stock: 42695KP51A Datasheet

MFR RecommendedRFQ

P6KE62A

Diotec SemiconductorIn Stock: 6406P6KE62A Datasheet

MFR RecommendedRFQ

5KP51A-TP

Micro Commercial CoIn Stock: 20965KP51A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the 5KP51A-B is determined by the following critical parameters: voltage classification (reverse standoff and clamping voltage), power dissipation capability, peak pulse current handling, and through-hole mounting compatibility. Substitute parts are grouped into two categories based on electrical equivalence:

Category 1 - Direct Electrical Equivalents (Same Power Class): Parts maintaining 5000W peak pulse power with comparable voltage ratings (51V standoff, 82.4V clamping). These include 5KP51A and 5KP51A-TP, which differ only in packaging format (Cut Tape vs. Bulk/alternative supplier package).

Category 2 - Reduced Power Class Alternatives (1500W Rating): Parts with lower peak pulse power (1500W) but similar voltage classification. These include 1.5KE62A, 1.5KE68A, and P6KE62A. These substitutes are applicable only when circuit design permits reduced power dissipation capacity.

Substitution eligibility requires: (1) operating temperature range compatibility (-55°C to 175°C minimum), (2) ROHS3 compliance or equivalent environmental certification, (3) through-hole axial mounting configuration, and (4) voltage parameters within the specified ranges.

Parameter Comparison

Engineering Selection Recommendations

5KP51A and 5KP51A-TP: These parts provide direct electrical equivalence to the 5KP51A-B with identical voltage and power specifications. Both maintain ROHS3 compliance and the full -55°C to 175°C operating range. Selection between these and the main part depends on packaging availability (Cut Tape vs. Bulk) and supplier sourcing. 5KP51A is available in higher quantity (4200 pcs) compared to 5KP51A-TP (1988 pcs).

1.5KE62A and 1.5KE68A: These 1500W alternatives are suitable only for applications where peak pulse power requirements do not exceed 1500W. Both maintain the -55°C to 175°C operating temperature range. 1.5KE62A offers ROHS3 compliance with significantly higher inventory (300200 pcs). 1.5KE68A provides higher clamping voltage (92V) but RoHS status is not specified. Package compatibility differs: 1.5KE62A uses DO-201AA/DO-27, while 1.5KE68A uses DO-201.

P6KE62A: This 600W alternative is applicable only for low-power transient suppression circuits. Operating temperature minimum is -50°C (versus -55°C for the main part), which may be limiting in extreme cold environments. RoHS status is not applicable. Package format is DO-204AC/DO-15, which differs from the main part's P600 package.

Frequently Asked Questions (FAQ)

Q: Can 1.5KE62A replace 5KP51A-B in all applications?

A: No. The 1.5KE62A is rated for 1500W peak pulse power versus 5000W for the 5KP51A-B. Substitution is valid only when circuit design confirms peak pulse power requirements do not exceed 1500W. Voltage parameters (53V standoff, 85V clamping) are within acceptable tolerance of the main part.

Q: What is the difference between 5KP51A and 5KP51A-TP?

A: Both parts have identical electrical specifications (51V standoff, 82.4V clamping, 5000W power, 61.9A peak pulse current). The difference is packaging format: 5KP51A is supplied in Cut Tape, while 5KP51A-TP uses an alternative supplier package (R-6). Both are ROHS3 compliant and maintain the full operating temperature range.

Q: Is P6KE62A suitable as a substitute?

A: P6KE62A is suitable only for applications with significantly reduced power dissipation requirements (600W maximum). The part uses a different package format (DO-15) and has a minimum operating temperature of -50°C instead of -55°C. Voltage parameters are comparable (53V standoff, 85V clamping).

Q: Why do substitute parts have different package formats?

A: Package format differences reflect different manufacturing series and supplier sourcing. All listed substitutes maintain through-hole axial mounting configuration for PCB compatibility. Physical package dimensions vary (P600 vs. DO-201 vs. DO-15), which may affect PCB layout and thermal management characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: No. 5KP51A, 5KP51A-TP, and 1.5KE62A are ROHS3 compliant. 1.5KE68A does not specify RoHS status. P6KE62A lists RoHS status as not applicable. Compliance verification is required for applications with environmental certification requirements.

Q: What is the minimum operating temperature consideration for P6KE62A?

A: P6KE62A operates from -50°C to 175°C, whereas the main part and most alternatives operate from -55°C to 175°C. In applications requiring operation below -50°C, P6KE62A is not suitable.