3KP11CA-B Equivalent & Substitute Parts

Part Overview

The 3KP11CA-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This through-hole axial component features an 11V reverse standoff voltage with an 18.2V maximum clamping voltage and 164.8A peak pulse current capability. The part is currently classified as obsolete, necessitating identification of equivalent alternatives to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

3KP11CA-B

Littelfuse Inc.In Stock: 7753KP11CA-B Datasheet

Current PartRFQ

5KP11CA-B

Littelfuse Inc.In Stock: 8635KP11CA-B Datasheet

DirectRFQ

3KP11CA-TP

Micro Commercial CoIn Stock: 9853KP11CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP11CA-B is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 11V
• Voltage - Breakdown (Min): 12.2V
• Voltage - Clamping (Max) @ Ipp: 18.2V
• Type: Zener (bidirectional, single channel)
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: Axial configuration

Regulatory Compliance:

• RoHS3 Compliant status

Substitute parts must maintain identical voltage specifications and operating temperature range to ensure functional equivalence in circuit protection applications. Package variations (P600 vs. R-6) are acceptable provided the axial through-hole mounting configuration is preserved.

Parameter Comparison

Engineering Selection Recommendations

5KP11CA-B (Littelfuse Inc.): This substitute maintains identical voltage specifications and operating temperature range as the 3KP11CA-B while offering active product status. The 5KP series provides increased peak pulse current (280.2A vs. 164.8A) and power dissipation (5000W vs. 3000W), delivering enhanced transient protection capability. The P600 axial package is mechanically identical to the original part. This option is recommended for applications requiring higher transient energy absorption or where design margin improvement is beneficial.

3KP11CA-TP (Micro Commercial Co): This substitute provides electrical equivalence with identical voltage specifications, peak pulse current (164.8A), and power dissipation (3000W) as the original 3KP11CA-B. Active product status ensures long-term availability. The R-6 axial package maintains through-hole mounting compatibility, though physical dimensions differ from the P600 package. This option is recommended for direct functional replacement where package footprint variation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 5KP11CA-B be used as a direct replacement for the 3KP11CA-B?

A: Yes. The 5KP11CA-B maintains identical voltage specifications (11V standoff, 12.2V breakdown, 18.2V clamping) and operating temperature range (-55°C to 175°C). The increased current and power ratings provide equivalent or superior protection. The P600 axial package is mechanically identical.

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

A: Both are axial through-hole packages suitable for PCB mounting. P600 and R-6 represent different physical form factors from different manufacturers. Verify PCB footprint compatibility before selecting the 3KP11CA-TP variant.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the 5KP11CA-B and 3KP11CA-TP are ROHS3 compliant, matching the regulatory status of the original 3KP11CA-B.

Q: Why is the 3KP11CA-B marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Littelfuse Inc. The substitute parts listed provide equivalent electrical functionality with active manufacturing status.

Q: Can I use the 3KP11CA-TP in a design originally specified for the 3KP11CA-B?

A: Yes. The 3KP11CA-TP provides identical electrical specifications and equivalent mechanical mounting. Verify that the R-6 package footprint accommodates your PCB layout before implementation.

Q: What is the significance of the higher current rating in the 5KP11CA-B?

A: The 5KP11CA-B (280.2A) provides greater transient current handling compared to the 3KP11CA-B (164.8A). This allows the 5KP series to suppress higher-energy transient events while maintaining the same voltage clamping characteristics.