5KP78 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP78 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features a 78V reverse standoff voltage rating, 5000W peak pulse power handling capability, and through-hole P600 axial packaging. The 5KP78 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

5KP78

Littelfuse Inc.In Stock: 11825KP78 Datasheet

Current PartRFQ

5KP78A

Littelfuse Inc.In Stock: 42885KP78A Datasheet

DirectRFQ

5KP78E3/TR13

Microchip TechnologyIn Stock: 11305KP78E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP78 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 78V
• Voltage - Breakdown (Min): Must be within the specified range (82.13V minimum)
• Power - Peak Pulse: Must be 5000W (5kW)
• Type: Must be Zener
• Unidirectional Channels: Must be 1
• Mounting Type: Must be Through Hole
• Package / Case: Must be P600, Axial
• Operating Temperature Range: Must support -55°C ~ 175°C (TJ)
• RoHS Status: Must be ROHS3 Compliant

The identified substitute parts meet these core electrical and mechanical requirements while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

Both 5KP78A and 5KP78E3/TR13 are qualified substitutes for the obsolete 5KP78, meeting all mandatory electrical and mechanical parameters. Selection between these alternatives should be based on the following factors:

5KP78A (Littelfuse Inc.): Active product status with Cut Tape packaging. Maintains Littelfuse manufacturer continuity. Voltage clamping at 126V provides margin below the original 132.3V specification. ROHS3 compliant with REACH Affected status.

5KP78E3/TR13 (Microchip Technology): Active product status with Tape & Reel packaging suitable for automated assembly. Voltage clamping at 139V represents higher transient suppression capability. ROHS3 compliant with REACH Unaffected status. Lower peak pulse current (36A vs. 40.5A) with equivalent power rating.

Both parts satisfy compliance requirements and operational specifications for direct substitution in existing 5KP78 circuit applications.

Frequently Asked Questions (FAQ)

Q: Can 5KP78A and 5KP78E3/TR13 be used interchangeably with the 5KP78?

A: Yes. Both substitute parts maintain the critical electrical parameters: 78V reverse standoff voltage, 5000W peak pulse power, Zener type, single unidirectional channel, and P600 axial through-hole package. Operating temperature range and RoHS3 compliance are identical.

Q: What is the significance of the voltage clamping differences (132.3V vs. 126V vs. 139V)?

A: Voltage clamping represents the maximum voltage across the device during transient suppression at peak pulse current. The 5KP78A (126V) provides tighter clamping than the original specification, while 5KP78E3/TR13 (139V) provides looser clamping. Both remain within acceptable substitution parameters for general-purpose overvoltage protection applications.

Q: Does packaging type (Cut Tape vs. Tape & Reel) affect electrical performance?

A: No. Packaging type affects only handling, storage, and assembly processes. Electrical characteristics and performance are identical between Cut Tape and Tape & Reel variants of the same part number.

Q: Are there compliance or regulatory differences between the substitutes?

A: Both substitutes are ROHS3 compliant. The 5KP78A carries REACH Affected status, while 5KP78E3/TR13 carries REACH Unaffected status. Compliance requirements should be verified against specific application and regional regulations.

Q: What is the current availability status of these substitutes?

A: 5KP78A: 4200 Pcs New Original In Stock. 5KP78E3/TR13: 1063 Pcs New Original In Stock. Availability should be confirmed with the component supplier for production requirements.