PKB5111WPI Equivalent & Substitute Parts Reference

Part Overview

The PKB5111WPI is an isolated module DC-DC converter manufactured by Flex Power Modules, delivering 5V output at 20A maximum current with 100W power capacity. This eighth brick format converter accepts input voltage from 18V to 75V and is designed for ITE (Commercial) applications. The product is currently obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within system designs.

Key Parameters

Parameter	Value
Output Voltage	5V
Output Current (Max)	20A
Power Rating	100W
Input Voltage Range	18V - 75V
Isolation Voltage	2.25 kV
Package Type	Eighth Brick
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 110°C
Efficiency	92%
Control Features	Enable, Active Low

Substitute Part Grouping Explanation

Substitution of the obsolete PKB5111WPI is determined by the following critical parameters:

Output Specifications: The substitute must deliver 5V output voltage. Output current capacity and power rating may exceed the original specification, as higher-rated converters operate within the same thermal and mechanical envelope.

Input Voltage Compatibility: The substitute input voltage range must encompass or exceed the original 18V - 75V specification. Substitutes with minimum input voltage of 36V are compatible with systems operating above 36V.

Package and Form Factor: All substitutes maintain the eighth brick mechanical format (2.30" L x 0.89-0.90" W x 0.34-0.39" H) and through-hole mounting, ensuring direct mechanical compatibility.

Electrical Isolation: Isolation voltage of 1.5 kV or higher satisfies the original 2.25 kV requirement for safety-critical applications.

Control Interface: Enable function with active-low control logic matches the original specification.

Compliance and Certifications: All substitutes carry identical regulatory approvals (CB, CSA, IEC, TUV, UL) and comply with IEC 62368-1 standard.

Parameter Comparison

Parameter	PKB5111WPI (Original)	PKB4111CPI (Substitute)	PKB4111DPI (Substitute)
Manufacturer	Flex Power Modules	Flex Power Modules	Flex Power Modules
Output Voltage	5V	5V	5V
Output Current (Max)	20A	28A	30A
Power Rating	100W	140W	150W
Input Voltage (Min)	18V	36V	36V
Input Voltage (Max)	75V	75V	75V
Isolation Voltage	2.25 kV	1.5 kV	2.25 kV
Package Type	Eighth Brick	Eighth Brick	Eighth Brick
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	-40°C ~ 110°C	-40°C ~ 125°C	-40°C ~ 125°C
Efficiency	92%	92%	94.7%
Control Features	Enable, Active Low	Enable, Active Low	Enable, Active Low
Product Status	Obsolete	Active	Active
Compliance Standard	IEC 62368-1	IEC 62368-1	IEC 62368-1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

PKB4111DPI is the primary substitute for the obsolete PKB5111WPI. This part maintains identical isolation voltage (2.25 kV), delivers higher output current capacity (30A versus 20A), and provides superior efficiency (94.7% versus 92%). The extended operating temperature range (-40°C ~ 125°C) and active product status ensure long-term availability and supply chain continuity. The 36V minimum input voltage accommodates systems operating above this threshold.

PKB4111CPI serves as an alternative substitute where input voltage remains above 36V. This converter provides 28A output current and 140W power capacity with active product status. The 1.5 kV isolation voltage is acceptable for applications not requiring the original 2.25 kV specification. Efficiency remains at 92%, matching the original part.

Both substitutes are ROHS3 compliant, carry identical regulatory certifications (CB, CSA, IEC, TUV, UL), and maintain the same eighth brick form factor with through-hole mounting. Selection between PKB4111DPI and PKB4111CPI depends on system input voltage requirements and isolation voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can PKB4111CPI or PKB4111DPI directly replace PKB5111WPI in existing designs?

A: Direct mechanical and electrical replacement is possible when system input voltage remains at or above 36V. Both substitutes maintain identical output voltage (5V), control interface (Enable, Active Low), and eighth brick package format. Verify that your system input voltage does not fall below 36V, as the original PKB5111WPI accepts input as low as 18V.

Q: What is the difference in isolation voltage between the substitutes?

A: PKB5111WPI and PKB4111DPI both provide 2.25 kV isolation. PKB4111CPI provides 1.5 kV isolation. Select PKB4111DPI if your application requires 2.25 kV isolation; select PKB4111CPI if 1.5 kV isolation meets system requirements.

Q: Do the substitute parts have higher output current ratings?

A: Yes. PKB4111CPI delivers 28A maximum output current, and PKB4111DPI delivers 30A maximum output current, compared to 20A for the original PKB5111WPI. Both substitutes operate within the same physical envelope and are suitable for applications requiring equal or lower current draw.

Q: Are there any temperature operating range differences?

A: The original PKB5111WPI operates from -40°C to 110°C. Both substitutes extend the upper limit to 125°C, providing improved thermal margin in high-temperature environments.

Q: What is the efficiency difference between substitutes?

A: PKB4111DPI achieves 94.7% efficiency, compared to 92% for both the original PKB5111WPI and the substitute PKB4111CPI. Higher efficiency reduces thermal dissipation and improves overall system power budget.

Q: Are all parts ROHS3 compliant?

A: Yes. PKB5111WPI, PKB4111CPI, and PKB4111DPI are all ROHS3 compliant and carry identical regulatory approvals (CB, CSA, IEC, TUV, UL) under IEC 62368-1 standard.

Q: What packaging is available for the substitute parts?

A: PKB4111CPI and PKB4111DPI are supplied in tray packaging, compared to the original PKB5111WPI packaging designation. Both maintain the eighth brick form factor suitable for through-hole mounting.

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