LMXS121JM470HTAS Equivalent & Substitute Parts

Part Overview

The LMXS121JM470HTAS is a 47 µH shielded drum core wirewound inductor manufactured by KYOCERA AVX, rated for 2.5 A continuous current with a maximum DC resistance of 100 mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and maintenance applications. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Key Parameters

Parameter	Value
Inductance	47 µH
Inductance Tolerance	±20%
Current Rating	2.5 A
DC Resistance (DCR)	100 mOhm Max
Core Type	Ferrite Drum Core, Shielded
Mounting Type	Surface Mount
Package Dimensions	12.50mm L x 12.50mm W x 8.00mm H
Operating Temperature Range	-40°C to 125°C
Inductance Test Frequency	100 kHz
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LMXS121JM470HTAS is determined by the following critical parameters:

Inductance Value: Must be 47 µH with ±20% tolerance
Current Rating: Substitute must support minimum 2.5 A continuous current
DC Resistance: Lower or equal DCR is acceptable; higher DCR introduces additional losses
Core Material & Shielding: Ferrite drum core with shielding must be maintained
Mounting Type: Surface mount configuration required
Package Footprint: 12.50mm x 12.50mm base dimensions with compatible height
Operating Temperature: Substitute range must encompass or exceed -40°C to 125°C
Compliance: ROHS3 compliance required

The B82477P4473M000 from EPCOS - TDK Electronics meets all substitution criteria with enhanced electrical performance characteristics.

Parameter Comparison

Parameter	LMXS121JM470HTAS (KYOCERA AVX)	B82477P4473M000 (EPCOS - TDK)	Compatibility
Inductance	47 µH	47 µH	Matched
Inductance Tolerance	±20%	±20%	Matched
Current Rating (Amps)	2.5 A	2.8 A	Compatible - Higher Rating
Current - Saturation	Not Specified	3 A	Defined in Substitute
DC Resistance (DCR)	100 mOhm Max	67 mOhm Max	Compatible - Lower DCR
Core Type	Ferrite Drum Core, Shielded	Ferrite Drum Core, Shielded	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Package Dimensions	12.50mm L x 12.50mm W x 8.00mm H	12.50mm L x 12.50mm W x 8.50mm H	Compatible - Minimal Height Variance
Operating Temperature Range	-40°C to 125°C	-55°C to 150°C	Compatible - Extended Range
Inductance Test Frequency	100 kHz	100 kHz	Matched
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Product Status	Obsolete	Active	Substitute is Current

Engineering Selection Recommendations

The B82477P4473M000 is the qualified substitute for the obsolete LMXS121JM470HTAS based on the following engineering criteria:

Electrical Compatibility: Both inductors maintain identical inductance values and tolerance specifications at the 100 kHz test frequency. The substitute provides superior DC resistance performance at 67 mOhm maximum versus 100 mOhm maximum, resulting in reduced power dissipation and improved thermal efficiency.

Current Handling: The B82477P4473M000 supports 2.8 A continuous current with a 3 A saturation point, exceeding the original 2.5 A rating and providing design margin for transient conditions.

Thermal Performance: The substitute operates across -55°C to 150°C, extending the lower and upper temperature boundaries beyond the original -40°C to 125°C specification, enabling deployment in broader environmental conditions.

Compliance & Availability: The B82477P4473M000 maintains ROHS3 compliance and is currently in active production with substantial inventory availability (42,408 pieces), ensuring supply chain continuity and long-term sourcing reliability.

Physical Compatibility: Package footprint dimensions are identical at 12.50mm x 12.50mm. The height variance of 0.50mm (8.50mm versus 8.00mm) is within typical PCB assembly tolerances for surface mount components.

Frequently Asked Questions (FAQ)

Q: Can the B82477P4473M000 be used as a direct replacement for the LMXS121JM470HTAS?

A: Yes. Both inductors share identical inductance values, tolerance specifications, core material, shielding configuration, and mounting type. The substitute provides equivalent or superior electrical performance across all critical parameters.

Q: What is the significance of the lower DC resistance in the substitute part?

A: Lower DC resistance (67 mOhm versus 100 mOhm) reduces resistive losses in the inductor coil, resulting in decreased power dissipation and improved circuit efficiency. This is a beneficial characteristic for direct substitution.

Q: Does the 0.50mm height difference affect PCB assembly compatibility?

A: No. The height variance of 0.50mm (8.50mm versus 8.00mm) is within standard PCB assembly tolerances for surface mount components and does not require design modifications.

Q: Why is the original part classified as obsolete?

A: The LMXS121JM470HTAS is no longer in active production by KYOCERA AVX. The B82477P4473M000 from EPCOS - TDK Electronics is the current equivalent offering equivalent functionality with enhanced specifications and active manufacturing support.

Q: Are there any compliance or certification differences between the two parts?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute includes AEC-Q200 automotive qualification, providing additional reliability assurance for demanding applications.

Q: What packaging format is available for the substitute part?

A: The B82477P4473M000 is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly operations.

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