5KP28-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP28-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 28V reverse standoff voltage rating and 5000W peak pulse power handling capability in a P600 axial through-hole package. The 5KP28-B is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

5KP28-B

Littelfuse Inc.In Stock: 11545KP28-B Datasheet

Current PartRFQ

5KP28A

Littelfuse Inc.In Stock: 149105KP28A Datasheet

DirectRFQ

5KP28A-B

Littelfuse Inc.In Stock: 11605KP28A-B Datasheet

DirectRFQ

SLD28U-017-B

Littelfuse Inc.In Stock: 674SLD28U-017-B Datasheet

MFR RecommendedRFQ

3KP28A-TP

Micro Commercial CoIn Stock: 19123KP28A-TP Datasheet

MFR RecommendedRFQ

5KP28A-TP

Micro Commercial CoIn Stock: 8035KP28A-TP Datasheet

MFR RecommendedRFQ

5KP28E3/TR13

Microchip TechnologyIn Stock: 8675KP28E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5KP28-B is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage - Reverse Standoff (Typ): 28V
• Voltage - Breakdown (Min): within acceptable range for 28V class devices
• Power - Peak Pulse: 5000W minimum (5kW)
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Type: Zener, Unidirectional

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole
• Package / Case: P600 Axial or equivalent axial through-hole package (R-6 acceptable with mechanical adaptation)

Compliance Requirements:

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

Substitute parts are grouped into two categories: direct electrical equivalents with identical P600 packaging, and functional equivalents with alternative axial packages (R-6) that require mechanical board layout consideration.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (P600 Package - Direct Mechanical Compatibility):

5KP28A and 5KP28A-B are direct Littelfuse Inc. equivalents with active product status. Both maintain P600 axial packaging, identical operating temperature range, and 5000W peak pulse power rating. The 5KP28A offers lower clamping voltage (45.4V vs. 47.67V) with higher peak pulse current (112.3A), providing improved transient suppression performance. Selection between cut tape and bulk packaging depends on procurement requirements.

SLD28U-017-B is the manufacturer-recommended automotive-grade substitute from Littelfuse Inc., qualified to AEC-Q101 standard. This part maintains identical electrical specifications to 5KP28A while providing automotive qualification for applications requiring enhanced reliability documentation and traceability.

Secondary Substitutes (Alternative Axial Packages - Mechanical Adaptation Required):

3KP28A-TP and 5KP28A-TP utilize R-6 axial packaging instead of P600. These parts require mechanical board layout verification due to different lead spacing and package dimensions. 3KP28A-TP is limited to 3000W peak pulse power, making it unsuitable for applications requiring full 5000W capability. 5KP28A-TP from Micro Commercial Co maintains 5000W power rating with R-6 packaging and active product status.

5KP28E3/TR13 from Microchip Technology provides P600 packaging compatibility with slightly elevated clamping voltage (50V vs. 47.67V) and active product status. This part is suitable for applications where marginally higher clamping voltage is acceptable.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes. SLD28U-017-B provides additional automotive qualification documentation for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can 5KP28A directly replace 5KP28-B without board modifications?

A: Yes. The 5KP28A maintains identical P600 axial through-hole packaging, operating temperature range (-55°C to 175°C), and 5000W peak pulse power rating. No board layout changes are required. The lower clamping voltage (45.4V vs. 47.67V) provides improved transient suppression performance.

Q: What is the difference between 5KP28A and 5KP28A-B?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: 5KP28A is supplied in cut tape (CT), while 5KP28A-B is supplied in bulk. Selection depends on procurement and assembly process requirements.

Q: Why is SLD28U-017-B recommended as a substitute?

A: SLD28U-017-B is the manufacturer-recommended equivalent from Littelfuse Inc. with active product status and AEC-Q101 automotive qualification. It maintains identical electrical performance to 5KP28A while providing enhanced reliability documentation for automotive and regulated applications.

Q: Can 3KP28A-TP be used as a substitute?

A: 3KP28A-TP is electrically compatible for 28V standoff voltage applications but is limited to 3000W peak pulse power compared to the 5KP28-B's 5000W rating. This part is suitable only for applications with lower power transient requirements. Additionally, R-6 packaging requires mechanical board layout verification.

Q: What is the impact of using 5KP28E3/TR13 with 50V clamping voltage?

A: The 5KP28E3/TR13 provides slightly higher clamping voltage (50V vs. 47.67V), which is acceptable for most general-purpose overvoltage protection applications. This marginal increase does not compromise circuit protection. P600 packaging ensures direct mechanical compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and environmental requirements.

Q: What packaging considerations apply to R-6 axial alternatives?

A: R-6 packages (3KP28A-TP, 5KP28A-TP) have different lead spacing and overall dimensions compared to P600 packages. Board layout verification is required to confirm mechanical fit, lead hole positioning, and component clearance before design implementation.