GLF2012T4R7M Equivalent & Substitute Parts

Part Overview

The GLF2012T4R7M is a 4.7 µH shielded drum core wirewound inductor manufactured by TDK Corporation in 0805 (2012 Metric) surface mount package. This component is rated for 450 mA continuous current with 240 mOhm DC resistance and operates across -20°C to 105°C. The product status is obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications.

Substiute Parts

GLF2012T4R7M

TDK CorporationIn Stock: 17321GLF2012T4R7M Datasheet

Current PartRFQ

LBR2012T4R7M

Taiyo YudenIn Stock: 2992LBR2012T4R7M Datasheet

MFR RecommendedRFQ

LQM21FN4R7N00L

Murata ElectronicsIn Stock: 3435LQM21FN4R7N00L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the GLF2012T4R7M is determined by the following critical parameters: inductance value (4.7 µH), package form factor (0805 / 2012 Metric), surface mount compatibility, and ferrite core material. The current rating and DC resistance are application-dependent constraints that must be evaluated against circuit requirements.

Two substitute parts are identified:

LBR2012T4R7M (Taiyo Yuden): Matches inductance, package, and core material. Unshielded configuration with reduced current rating (200 mA) and identical DCR (240 mOhm). Wider operating temperature range (-40°C to 105°C).

LQM21FN4R7N00L (Murata Electronics): Matches inductance, package, shielding, and core material. Multilayer construction with significantly reduced current rating (80 mA) and higher DCR (390 mOhm Max). Narrower operating temperature range (-40°C to 85°C).

Parameter Comparison

Engineering Selection Recommendations

LBR2012T4R7M is suitable for applications where current demand does not exceed 200 mA and shielding is not a circuit requirement. This part maintains identical inductance, tolerance, and DCR specifications while offering extended low-temperature operation. Product status "Not For New Designs" indicates limited long-term availability.

LQM21FN4R7N00L is appropriate for low-current applications (≤80 mA) requiring shielded construction and active product status. The multilayer construction provides compact height (1.05mm) and maintains shielding performance. Higher DCR (390 mOhm) and wider tolerance (±30%) must be evaluated against circuit specifications. Active product status ensures ongoing availability and supply chain stability.

For applications requiring the full 450 mA current rating and shielded performance of the original GLF2012T4R7M, neither substitute provides complete electrical equivalence. Circuit redesign or alternative package selection may be necessary.

Frequently Asked Questions (FAQ)

Q: Can LBR2012T4R7M replace GLF2012T4R7M in all applications?

A: No. While both parts share identical inductance (4.7 µH), tolerance (±20%), and DCR (240 mOhm), the LBR2012T4R7M has a maximum current rating of 200 mA compared to 450 mA for the GLF2012T4R7M. Additionally, LBR2012T4R7M is unshielded, which may introduce electromagnetic interference in sensitive circuits. Substitution is valid only when circuit current requirements do not exceed 200 mA and shielding is not required.

Q: What are the key differences between LQM21FN4R7N00L and the original part?

A: The LQM21FN4R7N00L differs in three critical areas: (1) current rating is 80 mA maximum versus 450 mA, (2) DC resistance is 390 mOhm maximum versus 240 mOhm, and (3) inductance tolerance is ±30% versus ±20%. The part uses multilayer construction instead of drum core wirewound. Substitution is valid only for low-current applications where these parameter differences are acceptable.

Q: Are both substitute parts physically compatible with the original PCB layout?

A: Both substitute parts use the same 0805 (2012 Metric) package and footprint. However, height differences exist: GLF2012T4R7M (1.35mm max), LBR2012T4R7M (1.45mm max), and LQM21FN4R7N00L (1.05mm max). Verify clearance in applications with height constraints.

Q: What is the significance of product status differences?

A: GLF2012T4R7M is obsolete, indicating no further manufacturing. LBR2012T4R7M is "Not For New Designs," suggesting limited future availability. LQM21FN4R7N00L is active, ensuring ongoing production and supply chain availability for new and existing designs.

Q: Do all parts meet the same compliance standards?

A: LBR2012T4R7M and LQM21FN4R7N00L are both ROHS3 compliant. All three parts have REACH Unaffected status. Verify specific compliance requirements for your application before selection.