PSK-S5B-3 Equivalent & Substitute Parts Reference

Part Overview

The CUI Inc. PSK-S5B-3 is an enclosed AC/DC converter with a single 3.3V, 1A output, rated at 3.3W, and wide universal input voltage. With product status marked as obsolete, it is necessary to find alternative models to maintain designs requiring this specific functionality and electrical performance. Substitutes must adhere to strictly compatible parameters such as voltage, current, regulatory approvals, form factor, and compliance certifications.

Key Parameters

Manufacturer Part Number	Manufacturer	Type	Number of Outputs	Voltage - Input	Voltage - Output 1	Current - Output (Max)	Power (Watts)	Applications	Operating Temperature	Efficiency	Mounting Type	Package / Case	Size / Dimension	Approval Agency	Standard Number	Line Regulation	Load Regulation	RoHS Status
PSK-S5B-3	CUI Inc.	Enclosed	1	85 ~ 264 VAC, 100 ~ 370 VDC	3.3V	1A	3.3W	ITE (Commercial)	-40°C ~ 70°C (With Derating)	68%	Through Hole	26-DIP Module, 5 Leads	37.0mm x 24.5mm x 18.0mm	CB Scheme, EN, IEC, UL	55024; 55032 Class A; 60950-1; 61000-3-2; 62368-1	±0.5%	±1%	RoHS Compliant

Substitute Part Grouping Explanation

Substitute AC/DC converters are grouped strictly based on the following parameters: matching output voltage (3.3V), equivalent or greater maximum output current, number of outputs (single output), input voltage range (must cover or exceed 85-264 VAC, 100-370 VDC), mounting type (through hole), device type (enclosed), RoHS status, and relevant agency approvals and standards. Physical dimensions, efficiency, and package style are also included, as provided, for direct compatibility assessment.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Type	Number of Outputs	Voltage - Input	Voltage - Output 1	Current - Output (Max)	Power (Watts)	Applications	Operating Temperature	Efficiency	Mounting Type	Package / Case	Size / Dimension	Approval Agency	Standard Number	Line Regulation	Load Regulation	RoHS Status
PSK-S5B-3	CUI Inc.	Enclosed	1	85 ~ 264 VAC, 100 ~ 370 VDC	3.3V	1A	3.3W	ITE (Commercial)	-40°C ~ 70°C (With Derating)	68%	Through Hole	26-DIP Module, 5 Leads	37.0mm x 24.5mm x 18.0mm	CB Scheme, EN, IEC, UL	55024; 55032 Class A; 60950-1; 61000-3-2; 62368-1	±0.5%	±1%	RoHS Compliant
PSK-5D-3	CUI Inc.	Enclosed	1	85 ~ 305 VAC, 100 ~ 430 VDC	3.3V	1.515A	5W	Household Appliances, ITE (Commercial)	-40°C ~ 85°C (With Derating)	71.5%	Through Hole	5-DIP Module, 4 Leads	25.4mm x 25.4mm x 17.6mm	CE, cURus	60335-1; 62368-1	±0.5%	±1%	ROHS3 Compliant
RAC05-3.3SK	Recom Power	Enclosed	1	85 ~ 264 VAC, 120 ~ 370 VDC	3.3V	1.515A	5W	ITE (Commercial)	-25°C ~ 70°C (With Derating)	76%	Through Hole	5-DIP Module	25.4mm x 25.4mm x 16.5mm	CE, cURus	—	±0.5%	±1%	ROHS3 Compliant
RAC05-3.3SK/277	Recom Power	Enclosed	1	85 ~ 305 VAC, 120 ~ 430 VDC	3.3V	1.51A	5W	Household Appliances, ITE (Commercial)	-40°C ~ 85°C (With Derating)	77%	Through Hole	9-DIP Module, 4 Leads	31.7mm x 26.7mm x 21.8mm	CE, cURus	—	±0.5%	1%	ROHS3 Compliant

Engineering Selection Recommendations

Substitute selection is based on the main part (PSK-S5B-3) being obsolete, with only RoHS-compliant, through-hole enclosed AC/DC converters listed as alternatives. The substitutes listed (PSK-5D-3, RAC05-3.3SK, RAC05-3.3SK/277) are all fully compliant with the necessary regulatory standards and maintain direct electrical and form factor compatibility as defined by the provided data.

Frequently Asked Questions (FAQ)

Q1: What are the most critical parameters for substituting the PSK-S5B-3 AC/DC converter?
A1: The most critical parameters are output voltage (3.3V), maximum output current (≥1A), input voltage range (must include 85–264 VAC, 100–370 VDC), device type (enclosed), through-hole mounting, and the same number of outputs.

Q2: Are all substitutes compatible with commercial ITE applications?
A2: According to the data provided, all substitute part numbers are suitable for ITE (Commercial) applications.

Q3: How does the package and size impact direct replacement?
A3: The substitute parts listed provide package styles and dimensions within the information given, which enables assessment of compatibility with original board layouts. Only listed data was used for evaluation.

Q4: Are there differences in compliance or certification across the substitute parts?
A4: All parts are RoHS compliant and possess regulatory approvals as specified. The exact nature of approvals and standards, based only on the data provided, is tabulated for comparison.

Q5: Can output power or efficiency differences impact substitution?
A5: Output power and efficiency differences are documented. All substitutes provide equal or greater output current and wattage within the scope of parameters supplied.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message