PKB4418PINB Equivalent & Substitute Parts

Part Overview

The PKB4418PINB is an isolated module DC-DC converter manufactured by Flex Power Modules, designed to deliver 1.8V at 25A output from a 36V to 75V input range. This eighth brick format converter provides 45W of power with adjustable output, remote on/off, and remote sense capabilities, operating across a temperature range of -40°C to 120°C.

The PKB4418PINB carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain system continuity, ensure design flexibility, and support long-term production requirements where original inventory becomes unavailable.

Substiute Parts

PKB4418PINB

Flex Power ModulesIn Stock: 742PKB4418PINB Datasheet

Current PartRFQ

PKB4118GCPI

Flex Power ModulesIn Stock: 1579PKB4118GCPI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PKB4418PINB is determined by compatibility across the following critical parameters:

Input Voltage Compatibility: The substitute part must accept the same 36V to 75V input range to function within existing power distribution architectures.

Output Voltage Specification: The substitute must deliver 1.8V output to maintain compatibility with downstream circuitry and load requirements.

Package and Form Factor: The substitute must maintain the eighth brick form factor and through-hole mounting configuration to ensure mechanical fit within existing PCB layouts and chassis designs.

Electrical Isolation: The substitute must provide isolation voltage sufficient for the application's safety and noise immunity requirements.

Control Interface: The substitute must support the same enable and active-low control logic to integrate with existing system control schemes.

Regulatory Compliance: The substitute must maintain equivalent certifications under IEC 62368-1 and equivalent agency approvals to satisfy safety and compliance requirements.

The PKB4118GCPI qualifies as a substitute based on these parameters while offering enhanced performance characteristics in output current capacity and power rating.

Parameter Comparison

Engineering Selection Recommendations

The PKB4118GCPI serves as the active substitute for the obsolete PKB4418PINB. Both converters maintain identical input voltage ranges (36V–75V) and output voltage specification (1.8V), ensuring direct functional compatibility within existing system architectures.

The PKB4118GCPI is manufactured by the same supplier and carries active product status, providing assured long-term availability and continued technical support. Both parts satisfy identical regulatory requirements under IEC 62368-1 and maintain equivalent agency certifications (CB, CSA, IEC, TUV, UL), confirming compliance with commercial ITE applications.

The PKB4118GCPI delivers enhanced performance through increased output current capacity (60A versus 25A) and higher power rating (108W versus 45W), enabling operation at higher load levels without thermal derating. The extended operating temperature range (-40°C to 125°C versus -40°C to 120°C) provides additional thermal margin for demanding environments.

The isolation voltage of the PKB4118GCPI (1.5 kV) remains adequate for commercial ITE applications, though it is lower than the main part specification (2.25 kV). System designs requiring the higher isolation voltage of the original part must evaluate this parameter against specific application safety requirements.

Both parts maintain identical control interface specifications (Enable, Active Low) and package form factors (eighth brick, through-hole mounting), eliminating the need for PCB redesign or control logic modification.

Frequently Asked Questions (FAQ)

Q: Can the PKB4118GCPI directly replace the PKB4418PINB without PCB modifications?

A: Yes. Both converters share identical input voltage ranges (36V–75V), output voltage (1.8V), package form factor (eighth brick), mounting type (through-hole), and control interface (Enable, Active Low). No PCB layout changes are required for mechanical or electrical integration.

Q: What is the primary difference between these two converters?

A: The PKB4118GCPI provides higher output current capacity (60A versus 25A) and greater power rating (108W versus 45W). The PKB4418PINB offers higher isolation voltage (2.25 kV versus 1.5 kV). The PKB4118GCPI is an active product with extended availability, while the PKB4418PINB is obsolete.

Q: Does the lower isolation voltage of the PKB4118GCPI affect system safety?

A: The 1.5 kV isolation voltage of the PKB4118GCPI is certified under IEC 62368-1 and approved by CB, CSA, IEC, TUV, and UL for commercial ITE applications. Applications requiring isolation voltage exceeding 1.5 kV must evaluate specific safety requirements against this specification.

Q: Are there thermal considerations when substituting the PKB4118GCPI?

A: The PKB4118GCPI operates across -40°C to 125°C, providing a 5°C higher maximum temperature rating than the PKB4418PINB (-40°C to 120°C). The higher power rating of the PKB4118GCPI may generate additional heat; thermal management design should account for the converter's thermal characteristics in the specific application environment.

Q: What is the packaging difference between these converters?

A: The PKB4418PINB is supplied in standard packaging, while the PKB4118GCPI is supplied in tray packaging. Both maintain identical eighth brick form factors and through-hole mounting configurations. Tray packaging facilitates automated assembly processes and improves handling efficiency for high-volume production.

Q: Are both converters RoHS compliant?

A: Yes. Both the PKB4418PINB and PKB4118GCPI are ROHS3 compliant and REACH unaffected, satisfying environmental and regulatory requirements for commercial electronics manufacturing.

Q: What is the efficiency difference between these converters?

A: The PKB4418PINB operates at 90% efficiency, while the PKB4118GCPI operates at 89.5% efficiency. This 0.5% difference reflects the design trade-offs associated with the higher power rating and output current capacity of the PKB4118GCPI.