Equivalent & Substitute Parts for VOFM-5-3.3

Part Overview

The VOFM-5-3.3 from CUI Inc. is an open frame AC/DC converter designed for medical applications, providing a single 3.3V output at up to 1.25A (5W) with universal input voltage range. The product is categorized as obsolete, necessitating the identification of suitable alternative models for continued design support, maintenance, or production needs.

Key Parameters

Parameter	VOFM-5-3.3 Value
Manufacturer	CUI Inc.
Type	Open Frame
Number of Outputs	1
Voltage - Input	85 ~ 264 VAC
Voltage - Output 1	3.3V
Current - Output (Max)	1.25A
Power (Watts)	5 W
Applications	Medical
Features	Universal Input
Operating Temperature	0°C ~ 70°C (With Derating)
Efficiency	68%
Mounting Type	Through Hole
Package / Case	4-DIP Module
Size / Dimension	2.17" x 1.38" x 0.83"
Approval Agency	CB Scheme, EN, IEC, UL
Line Regulation	0.5%
Load Regulation	1%
RoHS Status	RoHS Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are grouped strictly based on matching electrical and mechanical parameters essential to the AC/DC converter category. Evaluated parameters include:

Output Voltage (must be 3.3V)
Input Voltage Range (must include or exceed 85 ~ 264 VAC)
Output Power (must meet or exceed 5 W)
Output Current (must meet or exceed 1.25A)
Number of Outputs (single output)
Application suitability (must include Medical)
Mounting Type and Package / Case
RoHS Compliance and Approvals as provided

Parameter Comparison

Parameter	VOFM-5-3.3	VMS-20-3.3
Manufacturer	CUI Inc.	CUI Inc.
Type	Open Frame	Open Frame
Number of Outputs	1	1
Voltage - Input	85 ~ 264 VAC	90 ~ 264 VAC
Voltage - Output 1	3.3V	3.3V
Current - Output (Max)	1.25A	4A
Power (Watts)	5 W	20 W
Applications	Medical	Medical
Features	Universal Input	Universal Input
Operating Temperature	0°C ~ 70°C (With Derating)	-25°C ~ 70°C (With Derating)
Efficiency	68%	75%
Mounting Type	Through Hole	Through Hole
Package / Case	4-DIP Module	4-DIP Module
Size / Dimension	2.17" x 1.38" x 0.83"	2.38" x 1.60" x 0.80"
Approval Agency	CB Scheme, EN, IEC, UL	CB Scheme, EN, IEC, SIQ, TUV, UL
Line Regulation	0.5%	±0.5%
Load Regulation	1%	±1%
RoHS Status	RoHS Compliant	RoHS Compliant
MSL	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The VOFM-5-3.3 is classified as obsolete. The VMS-20-3.3 maintains compliance with similar RoHS requirements, approval agencies (CB Scheme, EN, IEC, UL), and is intended for medical applications with single output at 3.3V. Both devices use the 4-DIP module package and through-hole mounting type. No deviation from the provided certification or compliance standards is present.

Frequently Asked Questions (FAQ)

Q: What criteria are used to determine a valid substitute for VOFM-5-3.3?
A: Substitute parts must match key electrical parameters: output voltage (3.3V), input voltage range, number of outputs, application suitability (medical), mounting type, compliance (RoHS, MSL), and associated approval agencies.

Q: Is the package and mounting configuration the same between VOFM-5-3.3 and VMS-20-3.3?
A: Both utilize the 4-DIP module package and support through-hole mounting, maintaining mechanical compatibility.

Q: Are there any differences in output capabilities between the main and substitute part?
A: The VMS-20-3.3 provides higher output current (4A vs. 1.25A) and higher output power (20 W vs. 5 W), while maintaining the same output voltage and compliance requirements.

Q: Does the substitute maintain required regulatory approvals for medical applications?
A: The VMS-20-3.3 is documented with medical application intent and approvals from agencies matching or exceeding those of the VOFM-5-3.3.

Q: What should be verified when considering board-level replacement based on the provided data?
A: Mechanical dimensions, package type, mounting configuration, and all listed compliance/certification details as provided. No inference beyond given parameters should be applied.

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