P4KE56 Equivalent & Substitute Parts

Part Overview

The P4KE56 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features a 47.8V reverse standoff voltage, 80.85V maximum clamping voltage, and 400W peak pulse power rating in a DO-204AL (DO-41) axial package. The P4KE56 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

P4KE56

Littelfuse Inc.In Stock: 1124P4KE56 Datasheet

Current PartRFQ

P4KE56A

Taiwan Semiconductor CorporationIn Stock: 3501P4KE56A Datasheet

DirectRFQ

SAC45

Littelfuse Inc.In Stock: 4625SAC45 Datasheet

MFR RecommendedRFQ

P4KE56A-AP

Micro Commercial CoIn Stock: 1000P4KE56A-AP Datasheet

MFR RecommendedRFQ

P4KE56A-BP

Micro Commercial CoIn Stock: 839P4KE56A-BP Datasheet

MFR RecommendedRFQ

P4KE56A-G

Comchip TechnologyIn Stock: 725P4KE56A-G Datasheet

MFR RecommendedRFQ

P4KE56A-TP

Micro Commercial CoIn Stock: 1177P4KE56A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P4KE56 is determined by the following critical parameters:

• Reverse standoff voltage: 47.8V (±tolerance)
• Clamping voltage: 77–80.85V range
• Peak pulse current: 5.19–5.4A
• Peak pulse power: 400–500W
• Package compatibility: DO-204AL (DO-41) axial through-hole
• Operating temperature: -55°C to 150°C minimum
• Unidirectional configuration (single channel)
• General-purpose applications

Substitute parts are grouped into two categories:

Direct Equivalents (P4KE56A variants): Active parts from Taiwan Semiconductor Corporation and Micro Commercial Co with identical reverse standoff voltage (47.8V), clamping voltage (77V), and package specifications. These maintain full electrical and mechanical compatibility.

Functional Alternative (SAC45): Littelfuse Inc. manufacturer-recommended substitute with slightly lower reverse standoff voltage (45V) but higher peak pulse current (6.8A) and power rating (500W), packaged in DO-204AC (DO-15). This part provides enhanced protection margin and is suitable where the lower standoff voltage is acceptable for the application.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select P4KE56A from Taiwan Semiconductor Corporation when maximum inventory availability and active product status are required. This part maintains identical electrical specifications and package compatibility with the original P4KE56. All P4KE56A variants (P4KE56A-AP, P4KE56A-BP, P4KE56A-TP) from Micro Commercial Co provide equivalent electrical performance and are suitable for applications where packaging format (bulk) is acceptable. P4KE56A-G from Comchip Technology is compatible but operates at a reduced maximum temperature of 150°C; verify thermal requirements before selection.

For Enhanced Protection (Alternative): Select SAC45 from Littelfuse Inc. when higher peak pulse current (6.8A) and power rating (500W) provide design margin benefits. The 2.8V lower reverse standoff voltage (45V vs. 47.8V) results in earlier clamping action. This substitution requires verification that the application circuit tolerates the lower standoff voltage threshold. SAC45 uses DO-204AC (DO-15) package; confirm PCB layout compatibility before implementation.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity level remains at MSL 1 (Unlimited) across all parts. REACH status is unaffected for all active substitutes.

Frequently Asked Questions (FAQ)

Q: Can P4KE56A variants be used interchangeably with the original P4KE56?

A: Yes. P4KE56A, P4KE56A-AP, P4KE56A-BP, and P4KE56A-TP maintain the same reverse standoff voltage (47.8V), clamping voltage (77V), peak pulse current (5.3–5.4A), and DO-204AL (DO-41) package specifications. Differences exist only in packaging format (Tape & Reel vs. Bulk) and manufacturer. All are direct electrical equivalents.

Q: What is the difference between P4KE56A-G and other P4KE56A variants?

A: P4KE56A-G from Comchip Technology has identical electrical specifications but operates at a maximum junction temperature of 150°C instead of 175°C. For applications operating near the upper temperature limit, verify that 150°C maximum is acceptable before substitution.

Q: When should SAC45 be selected instead of P4KE56A?

A: SAC45 is selected when higher transient current handling (6.8A vs. 5.3A) and power dissipation (500W vs. 400W) are beneficial for circuit protection. The trade-off is a lower reverse standoff voltage (45V vs. 47.8V), which causes the device to clamp at a lower threshold. Confirm the application circuit can tolerate this lower clamping point before substitution.

Q: Are there package compatibility issues between P4KE56 and SAC45?

A: Yes. P4KE56 uses DO-204AL (DO-41) package, while SAC45 uses DO-204AC (DO-15) package. Although both are axial through-hole formats, physical dimensions differ. Verify PCB footprint and lead spacing compatibility before layout implementation.

Q: Do all substitute parts meet RoHS3 compliance?

A: P4KE56A, P4KE56A-G, and SAC45 are explicitly ROHS3 compliant. P4KE56A-AP, P4KE56A-BP, and P4KE56A-TP do not list RoHS status in available documentation; confirm compliance requirements with the manufacturer or supplier before procurement.

Q: What is the inventory availability for each substitute?

A: P4KE56A (Taiwan Semiconductor) has the highest availability at 3400 pieces. SAC45 (Littelfuse) has 4569 pieces. Micro Commercial Co variants range from 811–1094 pieces. Comchip Technology P4KE56A-G has 697 pieces. Verify current stock with your supplier before design commitment.