UNR-3.3/3-D5SM-C Equivalent & Substitute Parts Reference

Part Overview

The Murata Power Solutions UNR-3.3/3-D5SM-C is a DC-DC converter designed for linear regulator replacement, offering 1 output at 3.3V up to 3A, and a total power output of 10W. It is categorized for ITE (Commercial) applications, features OCP and UVLO protection functions, and operates from an input voltage range of 4.75V to 5.5V. The device is surface-mounted in a 9-SMD Module and specified for operation between -40°C and 70°C. The product is currently obsolete, requiring engineers to identify suitable alternatives for continuity in design, manufacturing, or repair requirements.

Key Parameters

Parameter	Main Part (UNR-3.3/3-D5SM-C)
Type	Linear Regulator Replacement DC-DC Converter
Number of Outputs	1
Voltage - Input (Min)	4.75V
Voltage - Input (Max)	5.5V
Voltage - Output 1	3.3V
Current - Output (Max)	3A
Power (Watts)	10 W
Applications	ITE (Commercial)
Features	OCP, UVLO
Operating Temperature	-40°C ~ 70°C
Efficiency	88%
Mounting Type	Surface Mount
Package / Case	9-SMD Module
Size / Dimension	1.22" L x 1.01" W x 0.49" H (31.0mm x 26.7mm x 12.5mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute and equivalent DC-DC converters are determined by matching the following key allowed parameters: number of outputs, input voltage range, output voltage, output current capability, power rating, application category, and mounting type. Substitutes are strictly listed where these parameters are supported for ITE (Commercial) use, and where the electrical and mechanical fit enables direct replacement. Substitute parts must be selected according to these strictly provided characteristics.

Parameter Comparison

Parameter	Main Part (UNR-3.3/3-D5SM-C)	Substitute Part (OKL-T/3-W5N-C)
Type	Linear Regulator Replacement DC-DC Converter	Non-Isolated PoL Module DC-DC Converter
Number of Outputs	1	1
Voltage - Input (Min)	4.75V	2.4V
Voltage - Input (Max)	5.5V	5.5V
Voltage - Output 1	3.3V	0.6~3.6V
Current - Output (Max)	3A	3A
Power (Watts)	10 W	10 W
Applications	ITE (Commercial)	ITE (Commercial)
Features	OCP, UVLO	Remote On/Off, OCP, OTP, SCP, UVLO
Operating Temperature	-40°C ~ 70°C	-40°C ~ 85°C
Efficiency	88%	95.3%
Mounting Type	Surface Mount	Surface Mount
Package / Case	9-SMD Module	12-SMD Module
Size / Dimension	1.22" L x 1.01" W x 0.49" H (31.0mm x 26.7mm x 12.5mm)	0.48" L x 0.48" W x 0.24" H (12.2mm x 12.2mm x 6.1mm)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The UNR-3.3/3-D5SM-C is obsolete, necessitating use of an alternative. The substitute Murata Power Solutions OKL-T/3-W5N-C is active and ROHS3 compliant, with a comparable or broader input voltage range, identical output current and power capability, surface mount compatibility, and certification for ITE (Commercial) applications. The substitute holds an MSL rating of 2 (1 Year), REACH unaffected, and EAR99 ECCN. Selection can be made solely on the basis of product status and compliance attributes as provided.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters must match to qualify OKL-T/3-W5N-C as a substitute for UNR-3.3/3-D5SM-C?
A1: Number of outputs, output voltage range, output current, power rating, input voltage range, application category, and mounting type must align as specified.

Q2: Does package/case difference affect substitution?
A2: Mechanical and electrical parameters such as surface mount compatibility and dimensional fit must be confirmed strictly according to provided size and package type.

Q3: Is the substitute part fully compliant for ITE (Commercial) applications?
A3: The OKL-T/3-W5N-C is categorized and specified for ITE (Commercial) use per the data provided.

Q4: What certifications and compliance statuses are relevant to the substitute selection?
A4: ROHS3 compliance, REACH status, MSL rating, and ECCN classification are directly listed for the substitute and can guide selection where required.

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