3KP7.5C-B Equivalent & Substitute Parts

Part Overview

The 3KP7.5C-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 a 7.5V reverse standoff voltage and 13.55V maximum clamping voltage with 232.6A peak pulse current capability. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where equivalent protection characteristics are required.

Substiute Parts

3KP7.5C-B

Littelfuse Inc.In Stock: 9673KP7.5C-B Datasheet

Current PartRFQ

5KP7.5CA-B

Littelfuse Inc.In Stock: 10715KP7.5CA-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP7.5C-B is determined by the following critical parameters that must remain consistent across equivalent components:

• Voltage - Reverse Standoff (Typ): 7.5V — establishes the normal operating voltage threshold
• Voltage - Breakdown (Min): Must support the same protection window
• Voltage - Clamping (Max) @ Ipp: Defines maximum transient voltage suppression
• Current - Peak Pulse (10/1000µs): Specifies surge current handling capability
• Power - Peak Pulse: Total energy dissipation capacity during transient events
• Mounting Type: Through Hole configuration required for mechanical compatibility
• Package / Case: P600 Axial package for direct form-factor replacement
• Operating Temperature Range: -55°C ~ 175°C (TJ) for thermal environment compatibility

The 5KP7.5CA-B qualifies as a direct substitute based on matching voltage standoff, breakdown characteristics, package type, and operating temperature range. While peak pulse current and power ratings differ, both components maintain the same protection voltage window and physical form factor.

Parameter Comparison

Engineering Selection Recommendations

The 5KP7.5CA-B is the qualified substitute for the obsolete 3KP7.5C-B. Both components are manufactured by Littelfuse Inc. and maintain identical voltage standoff and operating temperature specifications. The 5KP7.5CA-B is currently in active production status, ensuring long-term availability and supply chain continuity.

The 5KP7.5CA-B provides enhanced surge current handling (395.3A versus 232.6A) and increased peak pulse power dissipation (5kW versus 3kW), making it suitable for applications requiring equal or greater transient protection margins. The clamping voltage of 12.9V is lower than the original 13.55V, providing marginally improved voltage suppression performance. Both components comply with ROHS3 standards and share identical P600 axial through-hole packaging, enabling direct mechanical and electrical substitution without circuit board modifications.

Frequently Asked Questions (FAQ)

Q: Can the 5KP7.5CA-B be used as a direct replacement for the 3KP7.5C-B?

A: Yes. Both components share the same 7.5V reverse standoff voltage, identical operating temperature range (-55°C ~ 175°C), and P600 axial through-hole package configuration. The 5KP7.5CA-B provides enhanced current and power handling capabilities, making it electrically and mechanically compatible for direct substitution.

Q: What is the difference in clamping voltage between these parts?

A: The 3KP7.5C-B clamps at a maximum of 13.55V, while the 5KP7.5CA-B clamps at 12.9V. This 0.65V difference represents improved transient suppression performance in the substitute component.

Q: Why does the 5KP7.5CA-B have higher peak pulse current and power ratings?

A: The 5KP7.5CA-B is rated for 395.3A peak pulse current and 5kW peak pulse power, compared to 232.6A and 3kW for the 3KP7.5C-B. These higher ratings indicate the substitute component can handle more severe transient events while maintaining the same voltage protection window.

Q: Are there any compliance or certification differences?

A: Both components are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The 5KP7.5CA-B includes REACH Unaffected status. Both share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: What is the significance of the product status difference?

A: The 3KP7.5C-B is obsolete, while the 5KP7.5CA-B is active production. This ensures the substitute component will remain available for future procurement and system maintenance requirements.