3KP70-B Equivalent & Substitute Parts

Part Overview

The 3KP70-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. Rated at 70V reverse standoff with a 3kW peak pulse power rating, this component operates through a P600 axial package. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility for circuit protection applications.

Substiute Parts

3KP70-B

LittelfuseIn Stock: 9913KP70-B Datasheet

Current PartRFQ

5KP70A-B

Littelfuse Inc.In Stock: 9625KP70A-B Datasheet

DirectRFQ

15KP70A-TP

Micro Commercial CoIn Stock: 72715KP70A-TP Datasheet

MFR RecommendedRFQ

15KPA70AE3/TR13

Microchip TechnologyIn Stock: 77615KPA70AE3/TR13 Datasheet

MFR RecommendedRFQ

30KP70A-TP

Micro Commercial CoIn Stock: 97030KP70A-TP Datasheet

MFR RecommendedRFQ

3KP70A-TP

Micro Commercial CoIn Stock: 8573KP70A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP70-B is determined by the following critical parameters:

• Voltage Rating: All substitutes maintain the 70V reverse standoff specification, with breakdown voltages between 73.71V and 78.2V
• Unidirectional Configuration: Single-channel Zener diode topology preserved across all alternatives
• Mounting Type: Through-hole axial package required for direct PCB compatibility
• Operating Temperature: Full -55°C to 175°C range maintained across all candidates
• RoHS3 Compliance: All substitutes meet ROHS3 requirements
• Power Dissipation: Substitutes range from 3kW to 30kW peak pulse power, accommodating applications requiring equal or greater transient energy absorption

The 3KP70-B can be replaced by parts from the 3KP, 5KP, 15KP, and 30KP series, each offering identical voltage protection characteristics with varying current-handling and power dissipation capabilities.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Same Power Rating): The 3KP70A-TP from Micro Commercial Co provides electrical equivalence with identical 3kW peak pulse power and 26.5A peak current specifications. This part is active and ROHS3 compliant. Package variation (R-6 vs. P600) requires PCB footprint verification.

Package-Matched Upgrade: The 5KP70A-B from Littelfuse maintains the P600 axial package while providing increased power dissipation (5kW) and higher peak current (45.1A). This part is active and ROHS3 compliant, suitable for applications requiring enhanced transient protection margin.

Higher Power Capacity Alternatives: The 15KPA70AE3/TR13 from Microchip Technology offers P600 package compatibility with 15kW peak pulse power and 132.9A peak current, enabling protection of higher-energy transient events. The 15KP70A-TP and 30KP70A-TP provide equivalent power ratings in R-6 packages.

All recommended substitutes maintain the 70V voltage rating, -55°C to 175°C operating temperature range, and ROHS3 compliance required for direct functional replacement.

Frequently Asked Questions (FAQ)

Q: Can the 3KP70A-TP replace the 3KP70-B directly? A: Electrically, yes. Both maintain 70V reverse standoff, 26.5A peak current, and 3kW power dissipation. The package differs (R-6 vs. P600), requiring PCB footprint compatibility verification before substitution.

Q: What is the difference between the 3KP, 5KP, 15KP, and 30KP series? A: These designations indicate peak pulse power ratings: 3kW, 5kW, 15kW, and 30kW respectively. All maintain identical 70V voltage protection characteristics. Selection depends on the transient energy level the circuit must suppress.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed alternatives meet ROHS3 requirements, matching the compliance status of the original 3KP70-B.

Q: Does package type affect electrical performance? A: No. P600 and R-6 packages are both axial through-hole configurations with identical electrical characteristics. Selection is based on PCB layout and footprint availability.

Q: Why is the 3KP70-B obsolete? A: Littelfuse has transitioned this part to end-of-life status. Active alternatives from Littelfuse (5KP70A-B), Micro Commercial Co (3KP70A-TP, 15KP70A-TP, 30KP70A-TP), and Microchip Technology (15KPA70AE3/TR13) provide equivalent or enhanced protection capabilities.

Q: Can I use a higher power-rated part like the 15KPA70AE3/TR13 as a drop-in replacement? A: Yes. Higher power-rated parts with identical voltage specifications provide equivalent protection with additional transient energy margin. Verify package compatibility with your PCB design.