MU3261-122Y Ferrite Bead 1206 Equivalent & Substitute Parts

Part Overview

The MU3261-122Y is a 1.2 kOhm ferrite bead in 1206 surface mount package manufactured by Bourns Inc. This component is designed for power and signal line filtering applications with a maximum current rating of 100mA and DC resistance of 500mOhm. The part is currently obsolete, making equivalent and substitute components necessary for ongoing design support and production requirements. Suitable alternatives must maintain the same package footprint, impedance characteristics, and operating temperature range while meeting RoHS3 compliance standards.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	1.2 kOhms
Package / Case	1206 (3216 Metric)
Current Rating (Max)	100mA
DC Resistance (Max)	500mOhm
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Number of Lines	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MU3261-122Y are classified based on electrical and mechanical compatibility within the following criteria:

Direct Substitutes maintain identical impedance (1.2 kOhms @ 100 MHz), package (1206), and operating temperature range (-55°C ~ 125°C). These parts are pin-compatible and functionally equivalent for direct replacement.

Similar Substitutes share the same package and operating temperature but may have different impedance values or slightly different DC resistance specifications. These require circuit-level evaluation to confirm suitability.

Parametric Equivalents match the package and temperature range but offer different impedance values (1 kOhm vs. 1.2 kOhm). Selection depends on circuit design requirements and tolerance specifications.

The critical parameters determining substitution eligibility are:

Impedance @ 100 MHz (1.2 kOhms or 1 kOhms)
Package / Case (1206 only)
Operating Temperature Range (-55°C ~ 125°C)
DC Resistance (400mOhm to 500mOhm acceptable)
Current Rating (minimum 100mA required)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Product Status	RoHS Status
MU3261-122Y	Bourns Inc.	1.2 kOhms	100mA	500mOhm	1206 (3216 Metric)	Obsolete	ROHS3 Compliant
74279216	Würth Elektronik	1.2 kOhms	200mA	500mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
ILB1206ER122V	Vishay Dale	1.2 kOhms	100mA	400mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
74279214	Würth Elektronik	1 kOhms	200mA	450mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
BBBK00321611102Y00	Pulse Electronics	1 kOhms	200mA	400mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
BBBK00321611122Y00	Pulse Electronics	1.2 kOhms	200mA	400mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
EMI1206R-1000	API Delevan Inc.	1 kOhms	200mA	400mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
EMI1206R-1200	API Delevan Inc.	1.2 kOhms	200mA	400mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant
ILB1206ER102V	Vishay Dale	1 kOhms	200mA	400mOhm	1206 (3216 Metric)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred):

74279216 (Würth Elektronik): Matches 1.2 kOhm impedance and 500mOhm DCR. Offers higher current rating (200mA) and active product status. Recommended for direct substitution.
EMI1206R-1200 (API Delevan Inc.): Matches 1.2 kOhm impedance with improved current rating (200mA). Active status and ROHS3 compliance confirmed.
BBBK00321611122Y00 (Pulse Electronics): Matches 1.2 kOhm impedance with 200mA current rating and lower DCR (400mOhm). Active product status.

Alternative Selection (1 kOhm Impedance):

EMI1206R-1000 (API Delevan Inc.): 1 kOhm impedance alternative with 200mA current rating and 400mOhm DCR. Suitable where circuit design permits lower impedance.
ILB1206ER102V (Vishay Dale): 1 kOhm impedance with 200mA current rating. Highest inventory availability (12,050 pcs).
74279214 (Würth Elektronik): 1 kOhm impedance with 200mA current rating and 450mOhm DCR. Largest inventory (21,200 pcs).
BBBK00321611102Y00 (Pulse Electronics): 1 kOhm impedance with 200mA current rating and 400mOhm DCR.

All recommended substitutes maintain the 1206 package footprint, -55°C to 125°C operating temperature range, and ROHS3 compliance required for the original MU3261-122Y application.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 kOhm ferrite bead instead of the 1.2 kOhm MU3261-122Y? A: Substitution with 1 kOhm impedance parts (74279214, EMI1206R-1000, ILB1206ER102V, BBBK00321611102Y00) is possible only if circuit design specifications permit lower impedance filtering. The impedance difference affects EMI suppression characteristics and must be evaluated against application requirements.

Q: What is the difference between the Würth 74279216 and the Bourns MU3261-122Y? A: Both maintain 1.2 kOhm impedance @ 100 MHz and 500mOhm DCR in 1206 package. The Würth part offers double the current rating (200mA vs. 100mA) and is currently in active production status, making it the preferred direct replacement for the obsolete Bourns component.

Q: Are all substitute parts available in the same packaging format? A: Most substitutes are available in Tape & Reel (TR) packaging. The Pulse Electronics BBBK00321611122Y00 is available in standard packaging. Verify packaging requirements with your procurement specifications before final selection.

Q: Do all substitute parts meet RoHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original MU3261-122Y.

Q: Which substitute offers the best current rating margin? A: The Würth 74279216, Pulse Electronics BBBK00321611122Y00, and API Delevan EMI1206R-1200 all provide 200mA current rating, doubling the original 100mA specification and providing additional design margin for applications with variable current demands.

Q: Can I mix different substitute parts in the same design? A: Yes, provided all selected parts maintain identical impedance values (either all 1.2 kOhm or all 1 kOhm) and meet the minimum current and DCR specifications required by your circuit design. Mixing impedance values across the same signal line is not recommended.

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