5KP120A-B Equivalent & Substitute Parts

Part Overview

The 5KP120A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This through-hole component operates with a reverse standoff voltage of 120V and provides peak pulse power dissipation of 5000W. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and application requirements where packaging or current rating variations are acceptable within the electrical specification envelope.

Substiute Parts

5KP120A-B

Littelfuse Inc.In Stock: 8685KP120A-B Datasheet

Current PartRFQ

5KP120A

Littelfuse Inc.In Stock: 43305KP120A Datasheet

MFR RecommendedRFQ

SA120A

Taiwan Semiconductor CorporationIn Stock: 1090SA120A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP120A-B is determined by the following critical parameters:

• Voltage - Reverse Standoff: 120V (exact match required)
• Voltage - Breakdown (Min): 133V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 193V (exact match required)
• Operating Temperature Range: -55°C to 175°C (exact match required)
• Type: Zener, Unidirectional (exact match required)
• Mounting Type: Through Hole (exact match required)

Substitute parts are grouped into two categories based on packaging configuration and current rating capacity:

Category 1: Direct Equivalent (Same Packaging) 5KP120A (Littelfuse Inc.) - Identical electrical specifications with alternative packaging format (Cut Tape vs. Bulk).

Category 2: Functional Equivalent (Alternative Packaging) SA120A (Taiwan Semiconductor Corporation) - Matches all voltage and temperature specifications but uses DO-204AC (DO-15) package with reduced peak pulse current rating of 2.7A and 500W power dissipation.

Parameter Comparison

Engineering Selection Recommendations

5KP120A (Littelfuse Inc.) is the primary substitute for 5KP120A-B. Both parts are manufactured by Littelfuse Inc., share identical electrical specifications, and maintain ROHS3 compliance and active product status. The difference is packaging format: 5KP120A is supplied in Cut Tape format versus Bulk for the 5KP120A-B. This substitute is suitable for applications requiring the full 26.4A peak pulse current and 5000W power dissipation capability.

SA120A (Taiwan Semiconductor Corporation) is a functional equivalent with voltage and temperature specifications matching the main part. However, this substitute has reduced peak pulse current (2.7A vs. 26.4A) and power dissipation (500W vs. 5000W). SA120A uses the DO-204AC (DO-15) package instead of P600. This substitute is applicable only to applications where peak pulse current requirements do not exceed 2.7A and power dissipation remains below 500W. All three parts maintain active product status and full regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SA120A replace 5KP120A-B in all applications? A: No. SA120A has reduced peak pulse current (2.7A) and power dissipation (500W) compared to 5KP120A-B (26.4A, 5000W). SA120A is suitable only for applications with lower transient energy requirements. Verify application peak pulse current and power dissipation specifications before substitution.

Q: What is the difference between 5KP120A-B and 5KP120A? A: Both parts are identical in electrical specifications and package type (P600, Axial). The difference is packaging format: 5KP120A-B is supplied in Bulk, while 5KP120A is supplied in Cut Tape (CT). Both are manufactured by Littelfuse Inc. and are fully interchangeable.

Q: Are all three parts pin-compatible? A: 5KP120A-B and 5KP120A are pin-compatible (both use P600 package). SA120A uses DO-204AC (DO-15) package and has different physical dimensions, requiring PCB layout modification for substitution.

Q: Do all substitute parts meet the same compliance standards? A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. All maintain unlimited moisture sensitivity rating (MSL 1).

Q: What is the primary reason to use SA120A as a substitute? A: SA120A is selected when packaging constraints favor the smaller DO-204AC (DO-15) form factor and application peak pulse current does not exceed 2.7A. This substitute is not appropriate for high-energy transient suppression applications.