3KP43A-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 3KP43A-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 3000W peak pulse power rating in a through-hole P600 axial package.

The 3KP43A-B is classified as obsolete. Equivalent and substitute parts are available to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

3KP43A-B

Littelfuse Inc.In Stock: 8323KP43A-B Datasheet

Current PartRFQ

5KP43A-B

Littelfuse Inc.In Stock: 7095KP43A-B Datasheet

DirectRFQ

3KP43A-TP

Micro Commercial CoIn Stock: 12493KP43A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP43A-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 43V
• Voltage - Breakdown (Min): 47.8V
• Voltage - Clamping (Max) @ Ipp: 69.4V
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Type: Zener, Unidirectional

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or R-6 Axial

Compliance Criteria:

• RoHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts must maintain identical voltage specifications and operating temperature range. Peak pulse current and power ratings may vary based on the specific series designation (3KP vs. 5KP). Package variations (P600 vs. R-6) are acceptable provided the through-hole axial form factor is preserved.

Parameter Comparison

Engineering Selection Recommendations

5KP43A-B (Littelfuse Inc.): This direct substitute maintains identical voltage specifications and through-hole P600 axial package configuration. The 5KP43A-B is an active product with higher peak pulse current (74.6A) and power rating (5000W), providing enhanced transient protection capability. Selection of this part is appropriate for applications requiring sustained component availability and improved performance margin.

3KP43A-TP (Micro Commercial Co): This manufacturer-recommended substitute maintains identical voltage specifications and operating temperature range. The package variant (R-6 axial) differs from the original P600, but both are through-hole axial configurations suitable for PCB mounting. The 3KP43A-TP is an active product with REACH compliance documentation. This option is suitable for applications where package footprint compatibility with R-6 axial spacing is acceptable.

Both substitute parts satisfy the electrical and mechanical requirements for direct replacement of the obsolete 3KP43A-B. Selection between them depends on package form factor requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the 5KP43A-B replace the 3KP43A-B in all applications?

A: Yes, the 5KP43A-B maintains identical voltage specifications (43V reverse standoff, 69.4V clamping) and operating temperature range (-55°C ~ 175°C). The higher peak pulse current (74.6A vs. 43.2A) and power rating (5000W vs. 3000W) provide equivalent or superior protection. The through-hole P600 axial package is identical.

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

A: Both P600 and R-6 are through-hole axial package configurations for TVS diodes. The R-6 designation indicates a different physical form factor with potentially different lead spacing. Verify PCB footprint compatibility before selecting the 3KP43A-TP variant.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 5KP43A-B and 3KP43A-TP are both ROHS3 compliant, matching the compliance status of the original 3KP43A-B.

Q: Can I use the 3KP43A-TP as a direct pin-for-pin replacement?

A: The 3KP43A-TP maintains identical electrical specifications and through-hole axial mounting. However, the R-6 package may have different lead spacing compared to the P600 package. Verify PCB footprint compatibility before implementation.

Q: What is the moisture sensitivity level for these parts?

A: All three parts (3KP43A-B, 5KP43A-B, and 3KP43A-TP) have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.