20KPA52-B Equivalent & Substitute Parts

Part Overview

The 20KPA52-B is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This unidirectional zener diode operates with a 52V reverse standoff voltage and provides peak pulse current handling of 235.4A with 20kW peak pulse power dissipation. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

20KPA52-B

Littelfuse Inc.In Stock: 72020KPA52-B Datasheet

Current PartRFQ

20KPA52A

MDE Semiconductor IncIn Stock: 193420KPA52A Datasheet

DirectRFQ

20KPA52A-B

Littelfuse Inc.In Stock: 114020KPA52A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 20KPA52-B is determined by the following critical parameters:

• Reverse Standoff Voltage: Must be 52V (±tolerance as specified by manufacturer)
• Peak Pulse Current: Must be 235.4A minimum
• Peak Pulse Power: Must be 20000W (20kW) minimum
• Package Type: Must be P600, Axial Through Hole
• Unidirectional Channels: Must be 1
• Type: Must be Zener
• Operating Temperature Range: Must support -55°C to 175°C (TJ)
• Series Compatibility: Must belong to 20KPA series

The substitute parts 20KPA52A-B and 20KPA52A meet all critical substitution criteria. Both maintain identical reverse standoff voltage, peak pulse current, peak pulse power, package configuration, and operating temperature specifications. The primary distinction between the main part and substitutes is the clamping voltage characteristic and product status.

Parameter Comparison

Engineering Selection Recommendations

20KPA52A-B is the primary recommended substitute. This part is manufactured by Littelfuse Inc., the original manufacturer of the 20KPA52-B, and maintains active product status. It carries ROHS3 compliance and REACH Unaffected certification. The part is electrically compatible with identical reverse standoff voltage, peak pulse current, and peak pulse power specifications. The clamping voltage is lower (85.8V versus 90.09V), which represents improved transient suppression performance. Current inventory of 1054 units supports procurement continuity.

20KPA52A is an alternative substitute manufactured by MDE Semiconductor Inc. This part maintains all critical electrical parameters and package specifications identical to the main part. It carries ROHS3 compliance and REACH Unaffected certification with MSL rating of 1 (Unlimited). Higher inventory availability of 1908 units may support extended procurement requirements. Selection of this alternative should account for manufacturer change from Littelfuse Inc. to MDE Semiconductor Inc.

Frequently Asked Questions (FAQ)

Q: Can 20KPA52A-B and 20KPA52A be used interchangeably with 20KPA52-B?

A: Both parts meet the critical electrical and mechanical substitution criteria. They maintain identical reverse standoff voltage (52V), peak pulse current (235.4A), peak pulse power (20kW), and P600 axial through-hole package configuration. The primary difference is clamping voltage, where both substitutes provide lower clamping voltage (85.8V) compared to the original part (90.09V), resulting in improved transient suppression.

Q: Why is the clamping voltage different between the main part and substitutes?

A: The clamping voltage difference reflects manufacturing variations within the 20KPA series specifications. Both substitute parts maintain the same reverse standoff voltage and peak pulse current, which are the primary parameters determining circuit protection capability. The lower clamping voltage in substitutes represents tighter voltage regulation during transient events.

Q: Are there any compliance or certification differences?

A: All three parts are ROHS3 compliant. The 20KPA52A-B and 20KPA52A both carry REACH Unaffected certification. The 20KPA52-B does not specify REACH status. All parts are suitable for general-purpose applications without power line protection requirements.

Q: What is the significance of product status (Obsolete vs. Active)?

A: The 20KPA52-B is classified as obsolete, indicating discontinued manufacturing. The substitute parts 20KPA52A-B and 20KPA52A are active products with ongoing manufacturing support and availability. Selection of active alternatives ensures long-term procurement viability and design continuity.

Q: Does the package type remain the same across all parts?

A: Yes. All three parts use the P600 axial through-hole package configuration, ensuring mechanical and electrical compatibility in existing PCB designs without layout modifications.