BLM02AX121SN1D Equivalent & Substitute Parts

Part Overview

The BLM02AX121SN1D is a ferrite bead manufactured by Murata Electronics, part of the EMIFIL® BLM02 series. This 01005 (0402 Metric) surface mount component provides 120 Ohms impedance at 100 MHz with a maximum current rating of 250mA and 500mOhm DC resistance. The part is Active status and widely used in signal line filtering applications. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for this ferrite bead category.

Substiute Parts

BLM02AX121SN1D

Murata ElectronicsIn Stock: 47858BLM02AX121SN1D Datasheet

Current PartRFQ

BLM02BX121SN1D

Murata ElectronicsIn Stock: 20792BLM02BX121SN1D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The BLM02BX121SN1D qualifies as a parametric equivalent based on the following criteria:

Impedance matching: Both parts maintain 120 Ohms @ 100 MHz, the primary electrical specification for ferrite bead selection.

Package compatibility: Both use 01005 (0402 Metric) surface mount packaging with identical physical dimensions (0.016" L x 0.008" W / 0.40mm x 0.20mm) and maximum height (0.009" / 0.22mm).

DC resistance: Both specify 500mOhm maximum DC resistance.

Operating temperature range: Both support -55°C ~ 125°C.

Compliance alignment: Both are ROHS3 Compliant, REACH Unaffected, and carry identical ECCN (EAR99) and HTSUS (8548.00.0000) classifications.

Moisture sensitivity: Both rated MSL 1 (Unlimited).

The substitute part exhibits a higher current rating (350mA versus 250mA), which does not restrict substitution in applications designed for the original 250mA specification.

Parameter Comparison

Engineering Selection Recommendations

Both BLM02AX121SN1D and BLM02BX121SN1D are Active status components from Murata Electronics with identical compliance certifications (ROHS3, REACH Unaffected, EAR99). Selection between these parts is determined by application current requirements. The BLM02AX121SN1D is suitable for designs with maximum current draw up to 250mA. The BLM02BX121SN1D accommodates higher current applications up to 350mA while maintaining all other electrical and mechanical specifications. Both parts are qualified for the same operating temperature range and package footprint, enabling direct substitution within the specified current envelope.

Frequently Asked Questions (FAQ)

Q: Can BLM02BX121SN1D replace BLM02AX121SN1D in all applications?

A: Yes, within the current rating constraint. The BLM02BX121SN1D has a higher maximum current rating (350mA) and identical impedance, DC resistance, package dimensions, and operating temperature range. It is suitable for any application originally designed for the BLM02AX121SN1D.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both parts use 01005 (0402 Metric) packaging with dimensions of 0.016" L x 0.008" W (0.40mm x 0.20mm) and maximum height of 0.009" (0.22mm). They are mechanically interchangeable on the PCB.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both are ROHS3 Compliant, REACH Unaffected, and classified under ECCN EAR99 and HTSUS 8548.00.0000.

Q: What is the primary difference between these ferrite beads?

A: The primary difference is the maximum current rating. BLM02AX121SN1D is rated for 250mA, while BLM02BX121SN1D is rated for 350mA. All other electrical parameters, including impedance and DC resistance, are identical.

Q: Are moisture sensitivity levels the same?

A: Yes. Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.