MU3261-301Y Ferrite Bead 300 Ohm 1206 Equivalent & Substitute Parts

Part Overview

The MU3261-301Y is a 1206 surface mount ferrite bead manufactured by Bourns Inc., designed for power and signal line filtering applications. This component provides 300 ohms of impedance at 100 MHz with a maximum current rating of 300mA and 300mOhm DC resistance. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	300 Ohms
Package / Case	1206 (3216 Metric)
Current Rating (Max)	300mA
DC Resistance (Max)	300mOhm
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MU3261-301Y is determined by the following critical parameters:

Primary Matching Criteria:

Impedance @ 100 MHz: 300 Ohms (exact match required)
Operating Temperature Range: -55°C ~ 125°C (minimum requirement)
RoHS3 Compliance: Required for regulatory alignment
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Factors:

Package / Case: 1206 (3216 Metric) preferred; 1204 (3210 Metric) acceptable with mechanical verification
Current Rating: Minimum 300mA; higher ratings provide design margin
DC Resistance: Maximum 300mOhm; lower values reduce power dissipation

Substitute parts meeting all primary criteria and maintaining electrical performance within the specified operating envelope are classified as direct equivalents.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Product Status	RoHS Status
MU3261-301Y	Bourns Inc.	300 Ohms	300mA	300mOhm	1206 (3216 Metric)	Obsolete	ROHS3 Compliant
ILB1206ER301V	Vishay Dale	300 Ohms	300mA	300mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
EMI1206R-300	API Delevan Inc.	300 Ohms	500mA	200mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
FB321611T-301Y-S	Cal-Chip Electronics, Inc.	300 Ohms	350mA	200mOhm	1206 (3216 Metric)	Active	RoHS Compliant
BBBK00321611301Y00	Pulse Electronics	300 Ohms	400mA	200mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
2512063017Y0	Fair-Rite Products Corp.	300 Ohms	350mA	200mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
BMC2CY0300AN	TE Connectivity Passive Product	300 Ohms	350mA	200mOhm	1204 (3210 Metric)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (1206 Package):

ILB1206ER301V (Vishay Dale) provides the closest electrical match with identical impedance, current rating, and DC resistance specifications. This part maintains active product status and ROHS3 compliance, making it the primary substitute for direct replacement applications.

EMI1206R-300 (API Delevan Inc.), FB321611T-301Y-S (Cal-Chip Electronics), BBBK00321611301Y00 (Pulse Electronics), and 2512063017Y0 (Fair-Rite Products Corp.) all meet the core electrical requirements with enhanced current ratings and reduced DC resistance. These parts offer improved thermal performance and design margin while maintaining the 1206 package footprint and operating temperature range.

Package Variant:

BMC2CY0300AN (TE Connectivity) uses the 1204 (3210 Metric) package instead of 1206. This part meets all electrical specifications but requires mechanical layout verification to confirm PCB footprint compatibility before implementation.

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher current rating than the original MU3261-301Y?

A: Yes. Substitute parts with current ratings of 350mA, 400mA, or 500mA are electrically compatible. Higher current ratings indicate improved thermal capability and do not affect circuit performance when impedance and DC resistance specifications are maintained.

Q: What is the difference between the 1206 and 1204 package options?

A: The 1206 (3216 Metric) and 1204 (3210 Metric) packages differ in physical dimensions. The 1206 is the standard footprint for the MU3261-301Y. The 1204 variant (BMC2CY0300AN) requires PCB layout verification to confirm compatibility with existing 1206 pads and routing before use.

Q: Are all substitute parts ROHS3 compliant?

A: Six of the seven substitute parts are ROHS3 compliant. FB321611T-301Y-S carries RoHS compliance without the specific ROHS3 designation. Verify compliance requirements for your application before selection.

Q: Why is the MU3261-301Y listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Bourns Inc. Active substitute parts from alternative manufacturers provide equivalent electrical performance and continued supply availability.

Q: What is the significance of DC resistance differences between parts?

A: DC resistance affects power dissipation in the ferrite bead. The original MU3261-301Y specifies 300mOhm maximum. Substitute parts with 200mOhm DC resistance reduce power loss by approximately 33%, improving thermal performance in high-current applications while maintaining identical impedance characteristics.

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