3KP15-B Equivalent & Substitute Parts

Part Overview

The 3KP15-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 15V reverse standoff with a 25.62V maximum clamping voltage. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 3KP15-B operates across a wide temperature range (-55°C to 175°C) and is housed in a P600 axial package suitable for through-hole mounting applications in general-purpose transient protection circuits.

Substiute Parts

3KP15-B

Littelfuse Inc.In Stock: 10633KP15-B Datasheet

Current PartRFQ

5KP15A-B

Littelfuse Inc.In Stock: 8475KP15A-B Datasheet

DirectRFQ

5KP15A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 83335KP15A-E3/54 Datasheet

MFR RecommendedRFQ

5KP15AE3/TR13

Microchip TechnologyIn Stock: 7515KP15AE3/TR13 Datasheet

MFR RecommendedRFQ

5KP15E3/TR13

Microchip TechnologyIn Stock: 10515KP15E3/TR13 Datasheet

MFR RecommendedRFQ

BZW50-15

STMicroelectronicsIn Stock: 1480BZW50-15 Datasheet

MFR RecommendedRFQ

BZW50-15RL

STMicroelectronicsIn Stock: 1846BZW50-15RL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP15-B is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 15V (exact match required)
• Voltage - Breakdown (Min): 15.84V to 16.7V (acceptable range)
• Mounting Type: Through Hole (required for form factor compatibility)
• Package / Case: P600 or R-6 axial packages (mechanical compatibility)
• Operating Temperature Range: -55°C ~ 175°C (functional requirement)
• RoHS Status: ROHS3 Compliant (regulatory requirement)

Secondary Considerations:

• Voltage - Clamping (Max) @ Ipp: 24.4V to 26.9V (acceptable variance for general-purpose applications)
• Current - Peak Pulse: 186A to 209A (higher ratings provide enhanced protection margin)
• Power - Peak Pulse: 5000W (5kW) (higher ratings acceptable for drop-in replacement)

The substitute parts listed below meet all primary criteria and maintain functional compatibility within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The 5KP series parts (5KP15A-B, 5KP15A-E3/54, 5KP15AE3/TR13, 5KP15E3/TR13) are the preferred substitutes for the obsolete 3KP15-B. These components maintain the same 15V reverse standoff voltage and P600 axial package, ensuring direct mechanical and electrical compatibility. All 5KP series substitutes are active products with ROHS3 compliance and higher power ratings (5kW versus 3kW), providing enhanced transient protection capability. The 5KP15A-B from Littelfuse Inc. offers the closest electrical match with 24.4V clamping voltage and 209A peak pulse current.

Alternative Substitutes (Package Consideration Required):

The BZW50-15 and BZW50-15RL from STMicroelectronics are functionally equivalent but use the R-6 axial package instead of P600. These parts maintain the 15V reverse standoff specification and 5kW power rating. The R-6 package is mechanically compatible with through-hole mounting but has different physical dimensions. Selection of BZW50 series requires board layout verification to confirm mechanical fit.

Compliance and Availability:

All substitute parts listed are ROHS3 compliant and active products with confirmed inventory availability. The 5KP series offers multiple packaging options (Bulk, Cut Tape, Tape & Reel) to accommodate different procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the 3KP15-B be directly replaced with any of the listed substitutes?

A: Yes, the 5KP series parts (5KP15A-B, 5KP15A-E3/54, 5KP15AE3/TR13, 5KP15E3/TR13) provide direct replacement capability. All maintain the same 15V reverse standoff voltage, P600 axial package, and through-hole mounting configuration. The BZW50 series requires package dimension verification due to the R-6 case variant.

Q: What is the difference between the 5KP15A and 5KP15E3 variants?

A: Both maintain the 15V reverse standoff specification and P600 package. The 5KP15A-E3/54 and 5KP15AE3/TR13 specify 24.4V clamping voltage with 205A peak pulse current. The 5KP15E3/TR13 specifies 26.9V clamping voltage with 186A peak pulse current. Selection depends on the specific clamping voltage requirement of the application circuit.

Q: Are the BZW50-15 and BZW50-15RL interchangeable?

A: Yes, both parts are electrically identical with the same 15V reverse standoff, 35V clamping voltage, and 1714A peak pulse current. The primary difference is packaging designation. Both use the R-6 axial package and are suitable for through-hole mounting.

Q: What packaging options are available for the 5KP15A-E3/54 substitute?

A: The 5KP15A-E3/54 is supplied in Cut Tape (CT) packaging. Alternative 5KP series parts are available in Bulk (5KP15A-B) and Tape & Reel (TR) formats (5KP15AE3/TR13, 5KP15E3/TR13) to support different manufacturing and procurement workflows.

Q: Do all substitutes meet the same operating temperature range as the 3KP15-B?

A: The 5KP series substitutes specify -55°C to 175°C operating temperature, matching the 3KP15-B requirement. The BZW50 series does not specify operating temperature in the provided data; temperature range verification is required for applications with extreme temperature requirements.

Q: Is the higher power rating (5kW) of the 5KP series a concern for the 3KP15-B application?

A: No. The higher power rating of the 5KP series (5kW versus 3kW) provides enhanced transient protection margin and is acceptable for drop-in replacement. The 15V reverse standoff voltage and clamping characteristics remain the primary functional parameters for circuit compatibility.