Littelfuse 20KPA72 TVS Diode Equivalent & Substitute Parts

Part Overview

The Littelfuse 20KPA72 is a unidirectional Zener-type transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This component features a 72V reverse standoff voltage with a maximum clamping voltage of 121.8V at peak pulse current, housed in a through-hole P600 axial package. The 20KPA72 is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where this component is specified.

Substiute Parts

20KPA72

Littelfuse Inc.In Stock: 79120KPA72 Datasheet

Current PartRFQ

20KPA72A

MDE Semiconductor IncIn Stock: 190920KPA72A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 20KPA72 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 72V
• Voltage - Clamping (Max) @ Ipp: Must be within acceptable tolerance for the protected circuit
• Current - Peak Pulse (10/1000µs): 174.1A minimum
• Power - Peak Pulse: 20000W minimum
• Package / Case: P600, Axial (through-hole)
• Type: Zener, unidirectional
• Operating Temperature Range: -55°C to 175°C (TJ)

The 20KPA72A qualifies as a direct substitute based on matching reverse standoff voltage, peak pulse current, peak pulse power, package configuration, and operating temperature range. Variations in breakdown voltage and clamping voltage remain within acceptable engineering tolerances for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

The 20KPA72A from MDE Semiconductor Inc. is a direct functional equivalent to the obsolete Littelfuse 20KPA72. Both components maintain identical reverse standoff voltage, peak pulse current, peak pulse power ratings, and operating temperature specifications. The 20KPA72A is classified as active product status, ensuring continued availability and supply chain reliability.

Both parts are ROHS3 compliant, meeting environmental and regulatory requirements. The 20KPA72A carries REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity level, providing additional supply chain flexibility.

The minor variation in clamping voltage (116V versus 121.8V) represents a 4.8V reduction, which remains within acceptable engineering tolerance for general-purpose transient voltage suppression applications. The lower clamping voltage of the 20KPA72A may provide marginally improved protection characteristics in certain circuit configurations.

Frequently Asked Questions (FAQ)

Q: Can the 20KPA72A be used as a direct replacement for the 20KPA72 in existing designs?

A: Yes. Both components share identical reverse standoff voltage (72V), peak pulse current (174.1A), peak pulse power (20000W), operating temperature range (-55 to 175°C), and P600 axial through-hole package configuration. These parameters define functional equivalence for TVS diode applications.

Q: What is the significance of the clamping voltage difference between the two parts?

A: The 20KPA72 specifies a maximum clamping voltage of 121.8V, while the 20KPA72A specifies 116V. This 4.8V difference indicates that the 20KPA72A will clamp transient voltages at a slightly lower threshold. For general-purpose protection circuits, this variation is acceptable and may provide enhanced protection margins.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant. The 20KPA72A additionally carries REACH Unaffected status and specifies MSL 1 (Unlimited) moisture sensitivity level, compared to the 20KPA72's not-applicable MSL rating. These certifications support supply chain continuity and storage flexibility.

Q: Does the package configuration remain identical?

A: Yes. Both the 20KPA72 and 20KPA72A use the P600 axial through-hole package, ensuring mechanical and electrical compatibility in existing PCB layouts without modification.

Q: What is the product status difference, and why does it matter?

A: The 20KPA72 is classified as obsolete, while the 20KPA72A is active. Active product status ensures ongoing manufacturing, quality control, and supply availability. For new designs or system maintenance requiring component replacement, the 20KPA72A provides long-term supply chain assurance.