CS5101EN14 Equivalent & Substitute Parts Reference

Part Overview

The CS5101EN14 is a secondary-side controller IC manufactured by onsemi, designed for power supply applications requiring synchronous rectification control. This 14-PDIP through-hole component operates with a supply voltage range of 8V to 45V and delivers 12 mA supply current, making it suitable for isolated power converter topologies.

The CS5101EN14 is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support. Substitute parts must maintain compatibility with the secondary-side controller application while accommodating differences in packaging, voltage specifications, and thermal operating ranges.

Substiute Parts

CS5101EN14

onsemiIn Stock: 926CS5101EN14 Datasheet

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IR1161LTRPBF

Infineon TechnologiesIn Stock: 22500IR1161LTRPBF Datasheet

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LTC2945CMS#PBF

Analog Devices Inc.In Stock: 2125LTC2945CMS#PBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CS5101EN14 is determined by the following criteria:

Primary Compatibility Parameters:

• Application classification: Secondary-side controller functionality
• Supply voltage range: Must accommodate the 8V to 45V input specification
• Supply current: Maximum 12 mA operational requirement
• Operating temperature range: Minimum -40°C to 85°C coverage
• Package compatibility: Through-hole or surface-mount alternatives acceptable with board redesign consideration

Identified Substitutes:

The IR1161LTRPBF (Infineon Technologies) functions as a secondary-side controller with synchronous rectifier capability. Supply voltage range of 4.75V to 18V covers the lower operating band of the CS5101EN14. Surface-mount packaging (PG-SOT23-5) requires PCB layout modification. Operating temperature range extends to 125°C, exceeding CS5101EN14 specifications.

The LTC2945CMS#PBF (Analog Devices Inc.) operates as a general-purpose power supply controller with supply voltage range of 2.7V to 5.9V and input voltage range of 4V to 80V. Surface-mount packaging (12-MSOP) necessitates board redesign. Operating temperature range of 0°C to 70°C is narrower than CS5101EN14 specifications.

Parameter Comparison

Engineering Selection Recommendations

CS5101EN14 Replacement Priority:

For applications requiring continued support of existing CS5101EN14 designs, the IR1161LTRPBF provides secondary-side controller functionality with ROHS3 compliance and extended operating temperature range. Surface-mount conversion is required. Supply voltage range limitation (4.75V to 18V) restricts applicability to lower-voltage secondary-side topologies within the original 8V to 45V specification.

The LTC2945CMS#PBF is classified as Active product status, ensuring long-term availability and manufacturing support. ROHS3 compliance satisfies regulatory requirements. However, the narrower operating temperature range (0°C to 70°C) and reduced supply voltage specification (2.7V to 5.9V) limit direct substitution to applications operating within these constraints. Surface-mount packaging requires board redesign.

For new designs, the LTC2945CMS#PBF offers superior product lifecycle status and regulatory compliance. Existing designs utilizing the CS5101EN14 require detailed electrical verification before substitution, particularly regarding supply voltage and temperature operating ranges.

Frequently Asked Questions (FAQ)

Q: Can the IR1161LTRPBF directly replace the CS5101EN14 in existing PCB designs?

A: No. The IR1161LTRPBF uses surface-mount packaging (PG-SOT23-5) while the CS5101EN14 is through-hole (14-DIP). PCB layout modification is required. Additionally, the supply voltage range (4.75V to 18V) does not fully cover the original specification (8V to 45V).

Q: What is the primary limitation of the LTC2945CMS#PBF as a substitute?

A: The operating temperature range (0°C to 70°C) is narrower than the CS5101EN14 specification (-40°C to 85°C). Applications requiring operation below 0°C or above 70°C are not compatible. Surface-mount packaging also requires board redesign.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both IR1161LTRPBF and LTC2945CMS#PBF are ROHS3 compliant, whereas the CS5101EN14 is RoHS non-compliant. This compliance improvement may be required for new product certifications.

Q: Which substitute part has the longest product lifecycle support?

A: The LTC2945CMS#PBF is classified as Active product status, ensuring ongoing manufacturing and support. The IR1161LTRPBF is classified as Not For New Designs, indicating limited future availability.

Q: Can supply current differences affect substitution decisions?

A: Yes. The CS5101EN14 requires 12 mA supply current. The IR1161LTRPBF operates at 5 mA and the LTC2945CMS#PBF at 800 µA. Lower supply current requirements reduce power dissipation but do not prevent substitution if functional requirements are met.

Q: What packaging considerations apply to substitution?

A: The CS5101EN14 through-hole package (14-DIP) cannot be directly mounted on PCBs designed for surface-mount components. Both substitutes require surface-mount assembly processes and board layout redesign. Through-hole to surface-mount conversion involves schematic verification, PCB routing changes, and assembly process modification.