3KP70A Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 3KP70A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 70V reverse standoff voltage with 113V maximum clamping voltage and 26.5A peak pulse current capability in a P600 axial through-hole package. The 3KP70A is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements.

Substiute Parts

3KP70A

Littelfuse Inc.In Stock: 9923KP70A Datasheet

Current PartRFQ

5KP70A

Littelfuse Inc.In Stock: 48135KP70A Datasheet

DirectRFQ

3KP70A-TP

Micro Commercial CoIn Stock: 8573KP70A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP70A are identified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

• Identical reverse standoff voltage (70V)
• Identical breakdown voltage minimum (77.8V)
• Identical clamping voltage maximum (113V)
• Compatible through-hole axial package configuration
• Matching unidirectional channel configuration (1 channel)
• Operating temperature range compatibility (-55°C to 175°C)

The 5KP70A qualifies as a direct electrical substitute with enhanced power dissipation capability (5000W vs. 3000W) and higher peak pulse current (45.1A vs. 26.5A), maintaining all critical voltage parameters. The 3KP70A-TP provides electrical equivalence with identical power and current ratings but utilizes an R-6 package variant instead of P600.

Parameter Comparison

Engineering Selection Recommendations

The 5KP70A is the primary recommended substitute for the obsolete 3KP70A. Both components are manufactured by Littelfuse Inc., maintain identical voltage specifications, and are housed in the same P600 axial package. The 5KP70A carries active product status with higher power dissipation (5000W) and peak pulse current (45.1A), providing enhanced performance margin for transient protection applications. Both parts maintain ROHS3 compliance and identical operating temperature ranges.

The 3KP70A-TP, manufactured by Micro Commercial Co, provides electrical equivalence with matching power and current ratings. This substitute utilizes an R-6 package variant, requiring PCB layout and mechanical accommodation adjustments. The 3KP70A-TP is ROHS3 compliant and carries active product status.

Frequently Asked Questions (FAQ)

Q: Can the 5KP70A directly replace the 3KP70A in existing designs?

A: Yes. The 5KP70A maintains identical voltage parameters (70V standoff, 77.8V breakdown, 113V clamping) and uses the same P600 axial through-hole package. The higher power rating (5000W vs. 3000W) and peak pulse current (45.1A vs. 26.5A) provide enhanced protection capability without requiring circuit modifications.

Q: What is the primary difference between the 5KP70A and 3KP70A?

A: The 5KP70A provides higher power dissipation (5000W vs. 3000W) and higher peak pulse current (45.1A vs. 26.5A) while maintaining all critical voltage specifications. All other electrical and thermal parameters remain identical.

Q: Can the 3KP70A-TP be used as a direct replacement?

A: The 3KP70A-TP provides electrical equivalence with identical power (3000W) and current (26.5A) ratings. However, it uses an R-6 package instead of P600, requiring PCB layout modifications and mechanical accommodation changes.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 5KP70A and 3KP70A-TP are both ROHS3 compliant, matching the compliance status of the original 3KP70A.

Q: What is the operating temperature range for substitute parts?

A: Both substitute parts operate across the identical temperature range of -55°C to 175°C (TJ), matching the original 3KP70A specification.