PSK-S3-3 Equivalent & Substitute Parts Reference

Part Overview

The CUI Inc. PSK-S3-3 is an enclosed AC/DC converter rated at 3.3V and 2.3W output power, delivering up to 700mA of current from a wide input range (85 ~ 264 VAC, 100 ~ 370 VDC). This device is part of the PSK-S3 (3W) series and is designed for ITE (Commercial) applications, featuring through-hole mounting in a 26-DIP module package. The PSK-S3-3 has been designated as obsolete, necessitating evaluation of direct substitute parts with equivalent electrical and mechanical characteristics to ensure continuity of supply and compatibility in ongoing designs.

Key Parameters

Parameter	PSK-S3-3 Value
Manufacturer	CUI Inc.
Product Status	Obsolete
Type	Enclosed
Number of Outputs	1
Voltage - Input	85 ~ 264 VAC, 100 ~ 370 VDC
Voltage - Output 1	3.3V
Current - Output (Max)	700mA
Power (Watts)	2.3 W
Applications	ITE (Commercial)
Mounting Type	Through Hole
Package / Case	26-DIP Module, 5 Leads
Size / Dimension	1.46" L x 0.96" W x 0.71" H (37.0mm x 24.5mm x 18.0mm)
Operating Temperature	-40°C ~ 70°C (With Derating)
Efficiency	66%
Approval Agency	CB Scheme, EN, IEC, UL
Standard Number	55024; 55032 Class A; 60950-1; 61000-3-2; 62368-1
Line Regulation	±0.5%
Load Regulation	±1%
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution is strictly based on matching core parameters relevant to AC/DC converter function. These include:

Output voltage (3.3V)
Output current capability (≥700mA)
Power rating (≥2.3W)
Input voltage range compatibility
Through-hole mounting
Enclosed package format
Single output configuration
Equivalent or better operating temperature range
Applicable approval agency certifications
RoHS environmental compliance

Parts are grouped as substitutes only if all these core parameters align with the requirements defined by the PSK-S3-3.

Parameter Comparison

Parameter	PSK-S3-3	PSK-3D-3	RAC03-3.3SK
Manufacturer	CUI Inc.	CUI Inc.	Recom Power
Product Status	Obsolete	Active	Active
Type	Enclosed	Enclosed	Enclosed
Number of Outputs	1	1	1
Voltage - Input	85 ~ 264 VAC, 100 ~ 370 VDC	85 ~ 305 VAC, 100 ~ 430 VDC	85 ~ 264 VAC, 120 ~ 370 VDC
Voltage - Output 1	3.3V	3.3V	3.3V
Current - Output (Max)	700mA	900mA	900mA
Power (Watts)	2.3 W	3 W	3 W
Applications	ITE (Commercial)	Household Appliances, ITE (Commercial)	Household Appliances, ITE (Commercial)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	26-DIP Module, 5 Leads	5-DIP Module, 4 Leads	4-DIP Module
Size / Dimension	1.46" x 0.96" x 0.71" (37.0mm x 24.5mm x 18.0mm)	1.00" x 1.00" x 0.69" (25.4mm x 25.4mm x 17.6mm)	1.12" x 0.93" x 0.70" (28.5mm x 23.5mm x 17.9mm)
Operating Temperature	-40°C ~ 70°C (With Derating)	-40°C ~ 85°C (With Derating)	-40°C ~ 80°C (With Derating)
Efficiency	66%	72%	69%
Approval Agency	CB Scheme, EN, IEC, UL	CE, cURus	CE, cURus
Line Regulation	±0.5%	±0.5%	±2.5%
Load Regulation	±1%	±1%	±2.5%
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The CUI Inc. PSK-S3-3 is obsolete. Substitute selection must be strictly aligned on output voltage, current, input voltage range, package format, and compliance certifications. Both PSK-3D-3 and RAC03-3.3SK meet or exceed the core electrical parameters and RoHS environmental compliance. Approval agency certifications and mounting type correspond with the requirements in ITE (Commercial) and household applications. Dimensional differences and approval standards should be verified against application needs for compatibility.

Frequently Asked Questions (FAQ)

Q1: What parameters are mandatory for substitution in AC/DC converters like PSK-S3-3?
A1: Mandatory substitution parameters include output voltage, output current, power rating, input voltage range, enclosure type, mounting method, number of outputs, operating temperature, and approval certifications.

Q2: Are substitute parts always pin-to-pin compatible with the main part?
A2: Substitute parts must have equivalent package formats (enclosed, through-hole), but specific pin assignment and count may differ. It is necessary to confirm package/case and dimensional parameters.

Q3: Can substitutes be used in applications beyond ITE (Commercial)?
A3: Substitutes listed support ITE (Commercial) and household appliances as specified, subject to application requirements within provided parameters.

Q4: How do approval agency certifications affect substitution?
A4: Substitute devices must carry relevant certifications matching application standards, such as CE, cURus, EN, IEC, UL, and RoHS compliance to ensure regulatory compatibility.

Q5: Are there differences in efficiency, regulation, or temperature range among substitutes?
A5: Differences exist and are strictly identified in the parameter comparison table. Select substitutes within application tolerance for efficiency and regulation performance as per provided values.

Q6: Should package dimensions be considered in substitution?
A6: Yes, package size and configuration must align with mechanical constraints of the target application, as provided in table data.

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