Equivalent & Substitute Parts for 3KP64-B TVS Diode

Part Overview

The 3KP64-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection applications. This part operates with a 64V reverse standoff voltage and provides 3kW peak pulse power dissipation through a P600 axial package. The 3KP64-B is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical characteristics while offering active product status and improved availability.

Substiute Parts

3KP64-B

LittelfuseIn Stock: 10453KP64-B Datasheet

Current PartRFQ

5KP64A-B

Littelfuse Inc.In Stock: 10475KP64A-B Datasheet

DirectRFQ

15KPA64AE3/TR13

Microchip TechnologyIn Stock: 114615KPA64AE3/TR13 Datasheet

MFR RecommendedRFQ

30KP64A-TP

Micro Commercial CoIn Stock: 103530KP64A-TP Datasheet

MFR RecommendedRFQ

5KP64A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 82085KP64A-E3/54 Datasheet

MFR RecommendedRFQ

5KP64A-TP

Micro Commercial CoIn Stock: 12745KP64A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP64-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must equal 64V
• Unidirectional Channels: Must equal 1
• Type: Must be Zener
• Operating Temperature Range: Must support -55°C to 175°C (TJ)
• Mounting Type: Must be Through Hole
• RoHS Status: Must be ROHS3 Compliant

Substitute parts are grouped into two categories based on power dissipation capability and package configuration:

Category A (5kW Power Rating, P600 Package): Parts with 5000W peak pulse power and P600 axial package. These provide direct functional equivalence with enhanced current handling compared to the original 3KP64-B.

Category B (Higher Power Ratings, Alternative Packages): Parts with 15kW or 30kW peak pulse power ratings and alternative axial packages (R-6). These offer increased transient protection capability while maintaining the 64V standoff voltage specification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement)

The 5KP64A-B (Littelfuse) and 5KP64A-E3/54 (Vishay) are the preferred direct substitutes for the 3KP64-B. Both maintain the P600 axial package, support the full -55°C to 175°C operating temperature range, and are ROHS3 compliant. The 5KP64A-B offers the advantage of remaining within the Littelfuse product family, while the 5KP64A-E3/54 provides equivalent performance from an alternative qualified manufacturer. Both parts deliver 5000W peak pulse power, exceeding the original 3000W specification.

Alternative Substitutes (Enhanced Protection)

The 15KPA64AE3/TR13 (Microchip Technology) and 30KP64A-TP (Micro Commercial Co) provide higher power dissipation ratings (15kW and 30kW respectively) for applications requiring enhanced transient suppression. These parts maintain the 64V standoff voltage and full temperature range compliance. The 15KPA64AE3/TR13 retains the P600 package, while the 30KP64A-TP uses the R-6 axial package. Selection between these options depends on circuit board layout constraints and transient energy requirements.

Packaging Considerations

The 5KP64A-TP uses the R-6 axial package instead of P600. While both are through-hole axial configurations, physical dimensions differ. Verify PCB footprint compatibility before selection. The P600 package (5KP64A-B, 5KP64A-E3/54, 15KPA64AE3/TR13) provides direct mechanical compatibility with the original 3KP64-B design.

Frequently Asked Questions (FAQ)

Q: Can I use a 5kW-rated TVS diode as a direct replacement for the 3kW 3KP64-B?

A: Yes. The 5KP64A-B and 5KP64A-E3/54 are direct electrical and mechanical substitutes. The higher power rating (5000W vs. 3000W) provides additional transient suppression margin without affecting circuit operation. All critical parameters—reverse standoff voltage, breakdown voltage, clamping voltage, and operating temperature range—remain compatible.

Q: What is the difference between the P600 and R-6 axial packages?

A: Both P600 and R-6 are through-hole axial packages configurations for TVS diodes. Physical dimensions and lead spacing differ between them. The P600 package is used by 5KP64A-B, 5KP64A-E3/54, and 15KPA64AE3/TR13. The R-6 package is used by 5KP64A-TP and 30KP64A-TP. Verify PCB footprint compatibility with your design before selecting a part with an alternative package.

Q: Why would I choose a 15kW or 30kW rated part over the 5kW substitute?

A: Higher power-rated TVS diodes (15kW and 30kW) are selected when circuit transient energy levels exceed the 5kW capability. These parts clamp voltage spikes to similar levels (103–104V) while handling greater peak pulse currents. Selection depends on the actual transient energy present in your application, not on the original part's rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—5KP64A-B, 5KP64A-E3/54, 5KP64A-TP, 15KPA64AE3/TR13, and 30KP64A-TP—are ROHS3 compliant and suitable for applications requiring environmental compliance certification.

Q: Can I mix manufacturers in the same design?

A: Yes. All substitute parts meet the same electrical specifications for the 64V standoff voltage class and are qualified for general-purpose transient voltage suppression. Mixing manufacturers (Littelfuse, Vishay, Microchip, Micro Commercial Co) is acceptable provided all parts meet your circuit's electrical and thermal requirements.

Q: What is the impact of different clamping voltages (103V vs. 104.2V vs. 108.15V)?

A: Clamping voltage variation within this range (103–108.15V) reflects normal manufacturing tolerance across different manufacturers and product lines. All values fall within acceptable limits for general-purpose TVS applications. The original 3KP64-B clamps at 108.15V; substitutes clamp at 103–104.2V. This lower clamping voltage in substitutes provides slightly better transient suppression performance.