EMI-1206-120 Ferrite Bead 120 Ohm 1206 Equivalent & Substitute Parts

Part Overview

The EMI-1206-120 is a single-line ferrite bead manufactured by API Delevan Inc. in the 1206 (3216 Metric) surface mount package. This component provides 120 Ohms impedance at 100 MHz with a maximum current rating of 500mA and DC resistance of 150mOhm. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Impedance @ Frequency	120 Ohms @ 100 MHz
Current Rating (Max)	500mA
DC Resistance (DCR) (Max)	150mOhm
Package / Case	1206 (3216 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Number of Lines	1
Size / Dimension	0.126" L x 0.063" W (3.20mm x 1.60mm)
Height (Max)	0.051" (1.30mm)

Substitute Part Grouping Explanation

Substitution for the EMI-1206-120 is determined by the following critical parameters:

Primary Substitution Criteria:

Impedance @ 100 MHz: 120 Ohms (exact match required)
Package / Case: 1206 (3216 Metric) (exact match required)
Number of Lines: 1 (exact match required)
DC Resistance (DCR) (Max): 150mOhm (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

Secondary Compatibility Factors:

Current Rating (Max): 500mA minimum (equal or higher ratings are acceptable)
Mounting Type: Surface Mount (exact match required)
Size / Dimension: 0.126" L x 0.063" W (exact match required)

Parts meeting all primary criteria are classified as parametric equivalents. Parts with higher current ratings remain functionally compatible within the same electrical and mechanical envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Package	Operating Temp	Product Status	RoHS Status
EMI-1206-120	API Delevan Inc.	120 Ohms	500mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Obsolete	RoHS non-compliant
EMI1206R-120	API Delevan Inc.	120 Ohms	500mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Active	ROHS3 Compliant
BBBK00321611121Y00	Pulse Electronics	120 Ohms	500mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Active	ROHS3 Compliant
FB04YTYN121	Stackpole Electronics Inc	120 Ohms	500mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Active	Not specified
FB321611T-121Y-S-1	Cal-Chip Electronics, Inc.	120 Ohms	600mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Active	RoHS Compliant
MU3261-121Y	Bourns Inc.	120 Ohms	900mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
WLBD3216K2U121PP	Walsin Technology Corporation	120 Ohms	600mA	150mOhm	1206 (3216 Metric)	-55°C ~ 125°C	Active	Not specified

Engineering Selection Recommendations

Recommended Primary Substitute: EMI1206R-120

The EMI1206R-120 is the direct active equivalent from the original manufacturer API Delevan Inc. It maintains identical electrical specifications (120 Ohms @ 100 MHz, 500mA, 150mOhm DCR) and mechanical package (1206 / 3216 Metric). The part is currently in active production status and is ROHS3 compliant, addressing regulatory requirements that the obsolete EMI-1206-120 does not meet. Packaging is available in Tape & Reel (TR) format.

Recommended Secondary Substitutes: BBBK00321611121Y00 or FB321611T-121Y-S-1

BBBK00321611121Y00 (Pulse Electronics) provides identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part is suitable for direct replacement in applications where the original 500mA current rating is sufficient.

FB321611T-121Y-S-1 (Cal-Chip Electronics, Inc.) offers the same 120 Ohms @ 100 MHz impedance and 150mOhm DCR in the 1206 package. This part features an elevated current rating of 600mA, providing additional design margin. It is RoHS compliant and maintains active production status with high inventory availability (30,690 Pcs).

Alternative Consideration: MU3261-121Y

The MU3261-121Y (Bourns Inc.) meets all primary electrical and mechanical substitution criteria with a significantly higher current rating of 900mA. Although classified as obsolete, this part offers enhanced current capacity for applications requiring additional thermal or electrical margin. ROHS3 compliance is confirmed.

Non-Equivalent Part: BBBK00321611101Y00

The BBBK00321611101Y00 (Pulse Electronics) provides 100 Ohms @ 100 MHz impedance, which does not meet the 120 Ohms requirement of the original part. This part is not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher current rating than the original EMI-1206-120?

A: Yes. The EMI-1206-120 has a maximum current rating of 500mA. Substitute parts with equal or higher current ratings (such as FB321611T-121Y-S-1 at 600mA or MU3261-121Y at 900mA) are electrically compatible and mechanically interchangeable. Higher current ratings provide additional design margin without affecting performance in applications operating below the original 500mA specification.

Q: What is the difference between the obsolete EMI-1206-120 and the active EMI1206R-120?

A: Both parts are manufactured by API Delevan Inc. and share identical electrical specifications (120 Ohms @ 100 MHz, 500mA, 150mOhm DCR) and mechanical package (1206 / 3216 Metric). The primary difference is product status and RoHS compliance. The EMI1206R-120 is in active production and is ROHS3 compliant, while the EMI-1206-120 is obsolete and RoHS non-compliant. The EMI1206R-120 is the recommended direct replacement.

Q: Are all substitute parts available in the same packaging format?

A: No. The original EMI-1206-120 is available in standard packaging (not specified as Tape & Reel). Most active substitutes are supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. EMI1206R-120 and MU3261-121Y are available in Tape & Reel. MU3261-121Y is also available in Cut Tape (CT) & Digi-Reel® format. Verify packaging requirements with your procurement process before finalizing part selection.

Q: Can I substitute BBBK00321611101Y00 (100 Ohms) for the EMI-1206-120 (120 Ohms)?

A: No. The BBBK00321611101Y00 provides 100 Ohms @ 100 MHz impedance, which does not meet the 120 Ohms electrical specification of the original part. Impedance is a critical parameter for ferrite bead function in EMI filtering applications. This part is not suitable for direct substitution.

Q: What RoHS compliance status should I prioritize?

A: For new designs and long-term procurement, ROHS3 compliant parts are recommended. Active substitutes with ROHS3 compliance include EMI1206R-120, BBBK00321611121Y00, MU3261-121Y, and FB321611T-121Y-S-1. If legacy RoHS non-compliant designs must be maintained, the original EMI-1206-120 remains available in limited inventory (985 Pcs).

Q: Are there any differences in DC resistance among the substitute parts?

A: No. All substitute parts listed maintain the same maximum DC resistance of 150mOhm, matching the original EMI-1206-120 specification. DC resistance is a critical parameter for thermal performance and signal integrity in ferrite bead applications.

Q: Which substitute part has the highest inventory availability?

A: FB321611T-121Y-S-1 (Cal-Chip Electronics, Inc.) has the highest inventory availability with 30,690 Pcs in stock. This part meets all primary substitution criteria and is recommended for applications requiring immediate procurement or high-volume orders.

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