3KP70 Equivalent & Substitute Parts

Part Overview

The 3KP70 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. It features a 70V reverse standoff voltage rating and 3000W peak pulse power handling capability in a through-hole P600 axial package. The 3KP70 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing system support.

Substiute Parts

3KP70

Littelfuse Inc.In Stock: 7733KP70 Datasheet

Current PartRFQ

5KP70A

Littelfuse Inc.In Stock: 48135KP70A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP70 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 70V
• Unidirectional configuration (1 channel)
• Zener diode type
• General-purpose transient protection application

Mechanical Compatibility Criteria:

• Package / Case: P600, Axial
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C to 175°C

Regulatory Compliance:

• RoHS3 Compliant status

The 5KP70A qualifies as a direct substitute based on matching all critical electrical parameters (70V standoff voltage, unidirectional Zener type) and mechanical parameters (P600 axial through-hole package). The 5KP70A is an active product with enhanced power handling (5000W vs. 3000W), making it suitable for applications requiring the same voltage protection with improved thermal performance.

Parameter Comparison

Engineering Selection Recommendations

The 5KP70A is the recommended substitute for the obsolete 3KP70. Both devices maintain identical reverse standoff voltage (70V) and package configuration (P600 axial through-hole), ensuring direct mechanical and electrical compatibility in existing circuit designs.

The 5KP70A offers superior performance characteristics with 5000W peak pulse power handling compared to the 3KP70's 3000W rating, along with higher peak pulse current capability (45.1A vs. 26.5A). These enhancements provide improved transient suppression performance without requiring circuit modifications.

Both parts maintain ROHS3 compliance and identical operating temperature ranges (-55°C to 175°C), ensuring regulatory and thermal compatibility. The 5KP70A's active product status ensures long-term availability and supply chain continuity, addressing the obsolescence of the 3KP70.

Frequently Asked Questions (FAQ)

Q: Can the 5KP70A be used as a direct replacement for the 3KP70 in existing designs?

A: Yes. The 5KP70A maintains identical reverse standoff voltage (70V), unidirectional Zener configuration, and P600 axial through-hole package. No circuit modifications are required for substitution.

Q: What are the key differences between the 3KP70 and 5KP70A?

A: The primary differences are product status and power handling. The 5KP70A is an active product with 5000W peak pulse power and 45.1A peak pulse current, compared to the 3KP70's 3000W and 26.5A ratings. The 5KP70A also features a lower clamping voltage (113V vs. 118.65V), providing improved transient suppression performance.

Q: Are there any package or mounting differences between these parts?

A: No. Both the 3KP70 and 5KP70A use the P600 axial through-hole package and are mounted identically on PCBs.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the 3KP70 and 5KP70A are ROHS3 compliant and operate across the same temperature range (-55°C to 175°C).

Q: Why is the 5KP70A rated for higher power than the 3KP70?

A: The 5KP70A belongs to the 5KP series, which is designed for higher power dissipation applications. Both devices share the same voltage protection characteristics but differ in thermal handling capability.