3KP70CA Equivalent & Substitute Parts

Part Overview

The 3KP70CA is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose transient voltage protection in through-hole applications. This component features a 70V reverse standoff voltage with a 113V maximum clamping voltage and 26.5A peak pulse current capability. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

3KP70CA

LittelfuseIn Stock: 9103KP70CA Datasheet

Current PartRFQ

5KP70CA

Diotec SemiconductorIn Stock: 37915KP70CA Datasheet

DirectRFQ

3KP70CA-TP

Micro Commercial CoIn Stock: 7173KP70CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 3KP70CA are identified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

• Voltage - Reverse Standoff: 70V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 113V (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: P600 or R-6 Axial (compatible through-hole packages)
• Type: Zener, Bidirectional (exact match required)
• Operating Temperature Range: Must encompass or match -55°C to 175°C

Substitutes are grouped into two categories: direct manufacturer alternatives and manufacturer-recommended equivalents. Direct alternatives may offer enhanced electrical performance (higher peak pulse current or power dissipation) while maintaining identical voltage specifications. Manufacturer-recommended equivalents provide functional equivalence with identical electrical ratings.

Parameter Comparison

Engineering Selection Recommendations

5KP70CA (Diotec Semiconductor): This component is an active product with identical voltage specifications to the 3KP70CA. It provides enhanced electrical performance with 44A peak pulse current and 5000W power dissipation compared to the original 26.5A and 3000W ratings. The P600 package maintains mechanical compatibility with the original design. The operating temperature range of -50°C to 175°C covers the upper specification of the original part; applications requiring the full -55°C lower limit should verify thermal performance. This substitute is suitable for direct replacement in applications where the enhanced current and power handling do not create thermal or circuit design conflicts.

3KP70CA-TP (Micro Commercial Co): This component is the manufacturer-recommended equivalent, offering identical electrical specifications (26.5A peak pulse current, 3000W power dissipation, -55°C to 175°C operating range) to the original 3KP70CA. The R-6 axial package is mechanically compatible with through-hole mounting. This substitute provides functional equivalence with no performance trade-offs and is the preferred choice for direct replacement where package footprint compatibility is confirmed.

Frequently Asked Questions (FAQ)

Q: Can the 5KP70CA be used as a direct replacement for the 3KP70CA?

A: The 5KP70CA maintains identical voltage specifications (70V standoff, 113V clamping) and through-hole mounting compatibility. The higher peak pulse current (44A vs. 26.5A) and power dissipation (5000W vs. 3000W) represent enhanced performance. Substitution is valid provided the circuit design accommodates the increased current handling capability and thermal characteristics of the higher-rated device.

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

A: Both P600 and R-6 are axial through-hole packages formats for TVS diodes. The R-6 package used in the 3KP70CA-TP is mechanically compatible with P600 footprints in standard through-hole applications. Physical dimensions and lead spacing should be verified against the specific PCB design to confirm fit.

Q: Why is the 3KP70CA marked as obsolete?

A: The 3KP70CA is classified as obsolete by Littelfuse, indicating it is no longer in active production. The 3KP70CA-TP from Micro Commercial Co serves as the manufacturer-recommended replacement, providing identical electrical and thermal specifications for continued design support.

Q: Are there temperature range considerations when substituting the 5KP70CA?

A: The 5KP70CA operates from -50°C to 175°C, compared to the original -55°C to 175°C. Applications requiring operation below -50°C should use the 3KP70CA-TP to maintain the full temperature specification of the original design.

Q: What compliance certifications apply to these substitutes?

A: The original 3KP70CA is ROHS3 compliant. The 5KP70CA has not applicable RoHS status listed. The 3KP70CA-TP is REACH unaffected. Compliance requirements for your specific application should be verified against these designations.