Equivalent & Substitute Parts for 3KP100-B

Part Overview

The 3KP100-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 100V reverse standoff voltage with a 170.1V maximum clamping voltage and 18.5A peak pulse current capability in a through-hole P600 axial package. The part is classified as obsolete, necessitating identification of active alternative components that maintain electrical and mechanical compatibility for new designs and ongoing production requirements.

Substiute Parts

3KP100-B

LittelfuseIn Stock: 7523KP100-B Datasheet

Current PartRFQ

5KP100A-B

Littelfuse Inc.In Stock: 9245KP100A-B Datasheet

DirectRFQ

15KPA100AE3/TR13

Microchip TechnologyIn Stock: 102815KPA100AE3/TR13 Datasheet

MFR RecommendedRFQ

3KP100A-TP

Micro Commercial CoIn Stock: 10753KP100A-TP Datasheet

MFR RecommendedRFQ

5KP100A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 23575KP100A-E3/54 Datasheet

MFR RecommendedRFQ

5KP100AE3/TR13

Microchip TechnologyIn Stock: 7905KP100AE3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP100-B is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 100V (exact match required)
• Voltage - Clamping (Max) @ Ipp: Must not exceed 170.1V to ensure protection threshold compatibility
• Current - Peak Pulse (10/1000µs): Must meet or exceed 18.5A
• Power - Peak Pulse: Must meet or exceed 3000W
• Type: Zener diode, unidirectional configuration

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or R-6 axial packages (both compatible with through-hole PCB layouts)

Compliance Criteria:

• RoHS3 Compliant
• Operating Temperature Range: -55°C ~ 175°C (TJ)

Substitute parts are grouped into two categories based on package compatibility: P600 axial (direct mechanical replacement) and R-6 axial (alternative through-hole axial package).

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain the required 100V reverse standoff voltage and are classified as active products with current manufacturing status, ensuring long-term availability and supply chain stability.

P600 Axial Package Substitutes (Direct Mechanical Replacement):

5KP100A-B, 5KP100A-E3/54, and 5KP100AE3/TR13 provide enhanced electrical performance with higher peak pulse current (30.9A to 31.5A) and increased power dissipation (5000W) compared to the 3KP100-B. These components maintain P600 axial package compatibility and ROHS3 compliance. The 15KPA100AE3/TR13 offers the highest performance tier with 93.6A peak pulse current and 15000W power dissipation, suitable for applications requiring superior transient protection margins.

R-6 Axial Package Substitute (Alternative Through-Hole Configuration):

3KP100A-TP maintains identical electrical specifications (18.5A peak pulse current, 3000W power dissipation) to the original 3KP100-B but uses an R-6 axial package. This option is suitable for designs where R-6 package footprints are already established on PCBs.

Compliance Considerations:

All recommended substitutes except 3KP100A-TP are explicitly certified as ROHS3 compliant. All parts operate within the -55°C to 175°C temperature range. Selection should prioritize active-status components from established manufacturers (Littelfuse, Microchip Technology, Vishay) to ensure consistent quality and availability.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher peak pulse current than the original 3KP100-B?

A: Yes. Substitute parts with higher peak pulse current ratings (such as 5KP100A-B at 31.5A or 15KPA100AE3/TR13 at 93.6A) are electrically compatible. Higher current ratings provide additional protection margin and do not compromise circuit functionality. The critical requirement is that the reverse standoff voltage remains 100V and clamping voltage does not exceed the circuit's tolerance.

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

A: Both P600 and R-6 are through-hole axial package formats for diodes. P600 is the standard package for the 3KP100-B. The 3KP100A-TP substitute uses R-6 packaging. Both packages are mechanically compatible with through-hole PCB layouts, but PCB footprints must match the specific package designation. Verify your PCB design accommodates the selected package before implementation.

Q: Why is the 3KP100-B classified as obsolete?

A: The 3KP100-B is no longer in active production by Littelfuse. The substitute parts listed represent current manufacturing alternatives that meet or exceed the original specifications. For new designs and ongoing production, selection from the active substitute parts ensures continued component availability and supply chain reliability.

Q: Are all substitute parts ROHS3 compliant?

A: Five of the six substitute parts are explicitly certified as ROHS3 compliant (5KP100A-B, 15KPA100AE3/TR13, 5KP100A-E3/54, 5KP100AE3/TR13). The 3KP100A-TP does not specify RoHS status in the provided data. Verify RoHS compliance requirements for your application before selecting this part.

Q: Can I directly replace the 3KP100-B with 3KP100A-TP on an existing PCB?

A: The 3KP100A-TP maintains identical electrical specifications but uses an R-6 axial package instead of P600. Direct PCB replacement is possible only if your PCB footprint is designed for R-6 package dimensions. If your PCB is designed for P600 packages, use P600-packaged substitutes (5KP100A-B, 5KP100A-E3/54, or 5KP100AE3/TR13) for direct mechanical compatibility.

Q: What is the significance of the clamping voltage difference between the main part and substitutes?

A: The 3KP100-B has a maximum clamping voltage of 170.1V, while most substitutes clamp at 162V or 161.3V. Lower clamping voltages provide tighter protection thresholds and faster transient suppression. This difference is within acceptable engineering tolerance for general-purpose TVS applications and does not prevent substitution. Verify your circuit's maximum allowable voltage during transient events to confirm compatibility.