3KP70A-B Equivalent & Substitute Parts

Part Overview

The 3KP70A-B is a unidirectional 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 a 113V maximum clamping voltage and 26.5A peak pulse current capability. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and procurement continuity.

Substiute Parts

3KP70A-B

Littelfuse Inc.In Stock: 7273KP70A-B Datasheet

Current PartRFQ

5KP70A-B

Littelfuse Inc.In Stock: 9625KP70A-B Datasheet

DirectRFQ

3KP70A-TP

Micro Commercial CoIn Stock: 8573KP70A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP70A-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 70V
• Voltage - Clamping (Max) @ Ipp: 113V
• Voltage - Breakdown (Min): 77.8V
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Mounting Type: Through Hole
• Type: Zener, Unidirectional

Substitute parts must maintain identical voltage specifications (standoff, breakdown, and clamping voltages) and operating temperature range to ensure functional equivalence in protection circuits. Peak pulse current and power dissipation may vary based on application requirements, provided the substitute meets or exceeds the minimum specifications of the original design.

Parameter Comparison

Engineering Selection Recommendations

5KP70A-B (Littelfuse Inc.): This substitute is the preferred direct replacement from the original manufacturer. It maintains identical voltage specifications and operating temperature range while offering enhanced peak pulse current (45.1A) and power dissipation (5kW) capabilities. The part is in active production status, ensuring long-term availability and supply chain stability. ROHS3 compliance is maintained.

3KP70A-TP (Micro Commercial Co): This substitute provides electrical equivalence with matching voltage specifications, peak pulse current (26.5A), and power dissipation (3kW) to the original part. It is in active production status. The package designation differs (R-6 versus P600), requiring physical verification for PCB footprint compatibility. REACH compliance status is confirmed as unaffected.

Frequently Asked Questions (FAQ)

Q: Can the 5KP70A-B be used as a direct replacement for the 3KP70A-B?

A: Yes. Both parts share identical voltage specifications (70V standoff, 77.8V breakdown, 113V clamping) and operating temperature range (-55°C to 175°C). The 5KP70A-B offers higher peak pulse current (45.1A versus 26.5A) and power dissipation (5kW versus 3kW), making it suitable for applications requiring equal or greater transient protection capability.

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

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 designations represent different physical form factors. PCB layout compatibility must be verified before substituting 3KP70A-TP (R-6 package) for the original 3KP70A-B (P600 package).

Q: Are all substitutes RoHS compliant?

A: The 5KP70A-B is ROHS3 compliant. The 3KP70A-TP does not specify RoHS status in the provided data. Compliance verification with your procurement requirements is necessary before selection.

Q: Why is the 3KP70A-B marked as obsolete?

A: The original part is no longer in active production. The 5KP70A-B from Littelfuse Inc. is the recommended active-status alternative, ensuring continued availability and manufacturing support.

Q: Can peak pulse current differences affect circuit performance?

A: Peak pulse current rating indicates the maximum transient current the device can safely suppress. A substitute with equal or higher peak pulse current rating maintains or improves protection capability. The 5KP70A-B (45.1A) provides enhanced margin over the original specification (26.5A).