3KP75CA-B Equivalent & Substitute Parts

Part Overview

The 3KP75CA-B is a through-hole Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 75V reverse standoff voltage with a 121V maximum clamping voltage and 24.8A peak pulse current capability. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical characteristics while offering improved availability and, in some cases, enhanced performance specifications.

Substiute Parts

3KP75CA-B

Littelfuse Inc.In Stock: 11913KP75CA-B Datasheet

Current PartRFQ

5KP75CA-B

Littelfuse Inc.In Stock: 9315KP75CA-B Datasheet

DirectRFQ

15KP75CA-TP

Micro Commercial CoIn Stock: 78615KP75CA-TP Datasheet

MFR RecommendedRFQ

30KP75CA-TP

Micro Commercial CoIn Stock: 116730KP75CA-TP Datasheet

MFR RecommendedRFQ

3KP75CA-TP

Micro Commercial CoIn Stock: 9553KP75CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP75CA-B is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 75V and breakdown voltage minimum of 83.3V must be maintained
• Clamping Voltage Compatibility: Maximum clamping voltage must remain within 121V ±1V tolerance
• Current Handling: Peak pulse current of 24.8A represents the minimum requirement for direct substitution
• Package Compatibility: Through-hole axial mounting with P600 or R-6 package designations
• Temperature Range: Operating range of -55°C to 175°C (TJ)
• Compliance: ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity

The substitute parts are grouped into two categories: direct electrical equivalents with identical power ratings (3KP75CA-TP) and higher-power variants (5KP75CA-B, 15KP75CA-TP, 30KP75CA-TP) that maintain voltage specifications while offering increased transient energy absorption capability.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement): The 3KP75CA-TP from Micro Commercial Co is the direct electrical equivalent, maintaining identical voltage ratings (75V standoff, 121V clamping), current specifications (24.8A peak pulse), and power dissipation (3000W). This part is active in production status and ROHS3 compliant. Package transition from P600 to R-6 axial requires mechanical board layout verification but does not affect electrical performance.

Higher-Power Alternatives (For Enhanced Transient Protection): The 5KP75CA-B, 15KP75CA-TP, and 30KP75CA-TP maintain identical voltage specifications while providing increased peak pulse power handling (5kW, 15kW, and 30kW respectively). These parts are suitable for applications requiring greater transient energy absorption without modifying circuit voltage protection thresholds. All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level.

Availability Consideration: All substitute parts are classified as active products with current inventory availability, eliminating obsolescence risk associated with the original 3KP75CA-B.

Frequently Asked Questions (FAQ)

Q: Can the 5KP75CA-B, 15KP75CA-TP, or 30KP75CA-TP be used as direct replacements for the 3KP75CA-B? A: Yes. These parts maintain the critical voltage parameters (75V standoff, 121V clamping) and operating temperature range. The increased power ratings (5kW, 15kW, 30kW versus 3kW) provide enhanced transient suppression capability without affecting circuit protection thresholds. Package differences (P600 versus R-6) require mechanical verification but do not impact electrical substitution.

Q: What is the difference between the 3KP75CA-TP and the original 3KP75CA-B? A: Both parts are electrically identical with matching voltage ratings, current specifications, and power dissipation. The primary differences are manufacturer (Micro Commercial Co versus Littelfuse Inc.), product status (active versus obsolete), and package designation (R-6 versus P600). Both are ROHS3 compliant with unlimited moisture sensitivity.

Q: Are there package compatibility concerns when substituting from P600 to R-6 axial packages? A: Both P600 and R-6 are through-hole axial packages with identical lead spacing and mounting characteristics. Physical dimensions may vary slightly; board layout and component spacing should be verified during design transition. Electrical performance is unaffected by package designation.

Q: Do all substitute parts meet the same compliance standards as the original 3KP75CA-B? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original part's compliance profile.

Q: Which substitute part should be selected for new designs? A: The 3KP75CA-TP is the direct electrical equivalent for designs requiring 3kW peak pulse power. For applications with higher transient energy requirements, the 5KP75CA-B, 15KP75CA-TP, or 30KP75CA-TP provide proportionally increased protection while maintaining voltage specifications. All parts are active in production status.