PSK-S3-12 AC/DC Converter 12V 3W Equivalent & Substitute Parts

Part Overview

The PSK-S3-12 is an enclosed AC/DC converter manufactured by CUI Inc. delivering 12V output at 250mA maximum current with 3W power rating. This unit accepts universal input voltage ranging from 85–264 VAC or 100–370 VDC and operates across the temperature range of −40°C to 70°C with derating. The PSK-S3-12 is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support, maintenance, and new design implementations where this topology remains applicable.

Substiute Parts

PSK-S3-12

CUI Inc.In Stock: 903PSK-S3-12 Datasheet

Current PartRFQ

PSK-3D-12

CUI Inc.In Stock: 1146PSK-3D-12 Datasheet

MFR RecommendedRFQ

RAC03-12SK

Recom PowerIn Stock: 2595RAC03-12SK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PSK-S3-12 are selected based on electrical and mechanical compatibility within the following criteria:

Electrical Compatibility Requirements:

• Output voltage: 12V
• Output current capacity: 250mA minimum
• Power rating: 3W
• Input voltage range: Must accommodate 85–264 VAC and 100–370 VDC or equivalent ranges
• Line and load regulation: ±0.5% and ±1% respectively, or tighter tolerances
• Operating temperature: −40°C minimum to 70°C minimum

Mechanical Compatibility Requirements:

• Mounting type: Through Hole
• Package configuration: DIP module format with compatible lead count and footprint dimensions
• Physical dimensions: Comparable envelope to enable direct board-level substitution

Regulatory and Compliance Requirements:

• Certifications: CB Scheme, EN, IEC, UL, or equivalent international standards
• RoHS compliance status
• ECCN and HTSUS classification alignment

The substitute parts identified below meet these criteria and are suitable for direct replacement in applications originally designed for the PSK-S3-12.

Parameter Comparison

Engineering Selection Recommendations

PSK-3D-12 (CUI Inc.) – Recommended Primary Substitute

The PSK-3D-12 is the manufacturer-recommended equivalent for the obsolete PSK-S3-12. Both units are manufactured by CUI Inc. and share identical electrical output specifications (12V, 250mA, 3W). The PSK-3D-12 offers an extended input voltage range (85–305 VAC, 100–430 VDC) and higher maximum operating temperature (−40°C to 85°C versus −40°C to 70°C), providing improved performance margins in demanding applications. Line and load regulation remain equivalent at ±0.5% and ±1% respectively. The PSK-3D-12 carries active product status with current manufacturing support and holds ROHS3 compliance certification. The primary consideration is package configuration: the PSK-3D-12 uses a 5-DIP Module with 4 leads versus the PSK-S3-12's 26-DIP Module with 5 leads, requiring PCB footprint verification before implementation.

RAC03-12SK (Recom Power) – Alternative Substitute

The RAC03-12SK from Recom Power's POWERLINE RAC03-K series provides electrical equivalence with identical 12V output, 250mA current, and 3W power rating. Input voltage specifications (85–264 VAC, 120–370 VDC) are compatible with the original PSK-S3-12 design envelope. The RAC03-12SK maintains active product status and ROHS3 compliance. Operating temperature range extends to −40°C to 80°C. Regulation specifications differ: line regulation is ±2.5% and load regulation is ±2.5%, compared to the PSK-S3-12's ±0.5% and ±1%. This represents a relaxation in regulation performance and is suitable for applications with less stringent voltage stability requirements. Package configuration is 4-DIP Module, requiring footprint compatibility assessment. The RAC03-12SK is available in tube packaging with higher inventory availability (2497 units).

Compliance and Certification Alignment

Both substitute parts hold international certifications (CE, cURus) and maintain EAR99 ECCN classification matching the original PSK-S3-12. Both are ROHS3 compliant and REACH unaffected, supporting modern procurement and environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the PSK-3D-12 directly replace the PSK-S3-12 without PCB modification?

A: Electrical substitution is valid; however, package configuration differs. The PSK-S3-12 uses a 26-DIP Module with 5 leads, while the PSK-3D-12 uses a 5-DIP Module with 4 leads. PCB footprint verification and potential rework are required before implementation.

Q: What is the primary difference between the PSK-3D-12 and RAC03-12SK?

A: Both provide equivalent 12V, 250mA, 3W output. The PSK-3D-12 offers tighter regulation (±0.5% line, ±1% load) and higher maximum operating temperature (85°C). The RAC03-12SK has relaxed regulation (±2.5% line and load) but maintains active production status from an alternative manufacturer. Selection depends on regulation performance requirements and package compatibility.

Q: Are the substitute parts suitable for new designs or only for replacement of obsolete units?

A: Both substitute parts carry active product status and are suitable for new designs. The PSK-3D-12 is the manufacturer-recommended path forward from CUI Inc. The RAC03-12SK provides an alternative from an established power supply manufacturer. Design selection should account for package footprint, regulation requirements, and supply chain considerations.

Q: What is the impact of the different input voltage ranges on substitution?

A: The PSK-3D-12 accepts a wider AC input range (85–305 VAC versus 85–264 VAC) and wider DC input range (100–430 VDC versus 100–370 VDC). This provides improved performance margins in applications with variable input voltage. The RAC03-12SK maintains the original PSK-S3-12 AC range (85–264 VAC) with a slightly higher DC minimum (120 VDC versus 100 VDC). Both are compatible with standard universal input applications.

Q: How do efficiency differences affect system performance?

A: The PSK-S3-12 operates at 77% efficiency. Both substitutes (PSK-3D-12 and RAC03-12SK) achieve 78% efficiency, representing a marginal 1% improvement. For a 3W converter, this translates to approximately 30mW additional power dissipation reduction, which is negligible in most applications but contributes to improved thermal performance in thermally constrained environments.

Q: What packaging considerations apply to inventory and procurement?

A: The PSK-3D-12 is supplied in trays, while the RAC03-12SK is supplied in tubes. Packaging format affects handling, storage, and automated assembly compatibility. Procurement should verify packaging requirements against assembly line capabilities and storage conditions.