PSK-5D-3 AC/DC Converter 3.3V 5W Equivalent & Substitute Parts

Part Overview

The PSK-5D-3 is an enclosed AC/DC converter manufactured by CUI Inc., rated for 5W output power at 3.3V with a maximum output current of 1.515A. This single-output converter accepts universal AC/DC input ranging from 85–305 VAC and 100–430 VDC, making it suitable for household appliances and commercial ITE (Information Technology Equipment) applications. The part is active in production status and carries CE and cURus regulatory approvals.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

PSK-5D-3

CUI Inc.In Stock: 903PSK-5D-3 Datasheet

Current PartRFQ

RAC05-3.3SK

Recom PowerIn Stock: 1049RAC05-3.3SK Datasheet

SimilarRFQ

LD05-23B03R2

Mornsun America, LLCIn Stock: 1289LD05-23B03R2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PSK-5D-3 are classified into two categories based on electrical and mechanical compatibility:

Direct Parametric Equivalent: Parts that match all critical electrical specifications including output voltage (3.3V), output current (1.515A), power rating (5W), input voltage range (85–305 VAC / 100–430 VDC), operating temperature range (–40°C to +85°C), and package form factor (5-DIP Module, Through Hole). These parts are interchangeable without circuit modification.

Functional Equivalent with Input Range Variance: Parts that maintain identical output specifications and package form factor but operate within a narrower input voltage range (85–264 VAC / 120–370 VDC). These parts are suitable for applications where the full input range of the original part is not required.

Substitution eligibility is determined by the following parameters:

• Output voltage and current ratings
• Power rating
• Input voltage operating range
• Package type and mounting method
• Regulatory compliance status
• Operating temperature range
• Line and load regulation specifications

Parameter Comparison

Engineering Selection Recommendations

PSK-5D-3 (CUI Inc.): Select this part as the primary choice when full input voltage range coverage (85–305 VAC / 100–430 VDC) and extended operating temperature range (–40°C to +85°C) are required. This part is suitable for applications requiring maximum environmental tolerance and universal input capability.

LD05-23B03R2 (Mornsun America, LLC): This part is a direct parametric equivalent to the PSK-5D-3. It provides identical electrical specifications, input voltage range, operating temperature range, and package configuration. The LD05-23B03R2 carries additional CB regulatory approval in addition to CE and cURus certifications. Select this part when the PSK-5D-3 is unavailable and full specification matching is required.

RAC05-3.3SK (Recom Power): This part is a functional equivalent suitable for applications where the input voltage range can be limited to 85–264 VAC and 120–370 VDC. The operating temperature range is narrower (–25°C to +70°C) compared to the PSK-5D-3. The RAC05-3.3SK offers higher efficiency (76% versus 71.5%) and is packaged in a tube format rather than tray. Select this part only when the reduced input voltage range and operating temperature limits are acceptable for the target application.

All three parts maintain identical output specifications, line regulation, load regulation, and RoHS3 compliance status. Selection should be based on input voltage range requirements, operating temperature constraints, and packaging format availability.

Frequently Asked Questions (FAQ)

Q: Can the RAC05-3.3SK replace the PSK-5D-3 in all applications?

A: The RAC05-3.3SK is functionally equivalent for output specifications but operates within a narrower input voltage range (85–264 VAC / 120–370 VDC) and lower operating temperature range (–25°C to +70°C). It is suitable only for applications where these reduced ranges meet system requirements.

Q: What is the primary difference between the PSK-5D-3 and LD05-23B03R2?

A: Both parts are direct parametric equivalents with identical electrical specifications, input voltage ranges, operating temperature ranges, and package configurations. The LD05-23B03R2 includes CB regulatory approval in addition to CE and cURus certifications. Either part can be selected interchangeably based on availability.

Q: Are all three parts compatible with the same PCB footprint?

A: All three parts use 5-DIP Module through-hole mounting with identical physical dimensions (1.00" L × 1.00" W). The PSK-5D-3 and LD05-23B03R2 are specified with 4 leads, while the RAC05-3.3SK is specified as a 5-DIP Module. PCB footprint compatibility should be verified against the specific lead configuration of each part.

Q: What packaging formats are available for these parts?

A: The PSK-5D-3 is supplied in tray packaging. The RAC05-3.3SK is supplied in tube packaging. The LD05-23B03R2 is supplied in tray packaging. Packaging format selection may affect procurement quantities and handling requirements.

Q: Do all three parts meet the same regulatory standards?

A: The PSK-5D-3 and RAC05-3.3SK carry CE and cURus approvals. The LD05-23B03R2 carries CB, CE, and cURus approvals. All three parts are ROHS3 compliant and REACH unaffected. The LD05-23B03R2 provides the broadest regulatory coverage.

Q: Which part should be selected for applications requiring operation below –25°C?

A: Only the PSK-5D-3 and LD05-23B03R2 are rated for operation down to –40°C. The RAC05-3.3SK is limited to –25°C minimum operating temperature and is not suitable for applications requiring lower temperature operation.

Q: Are there differences in efficiency between these parts?

A: The RAC05-3.3SK operates at 76% efficiency, while both the PSK-5D-3 and LD05-23B03R2 operate at 71.5% efficiency. The efficiency difference may be relevant for applications with thermal or power consumption constraints.