GLF201208T4R7M Equivalent & Substitute Parts

Part Overview

The GLF201208T4R7M is a 4.7 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 300 mA with 740mOhm DC resistance in a 0805 (2012 Metric) surface mount package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain the same inductance value, package footprint, and core electrical characteristics while accommodating variations in shielding configuration and current ratings.

Substiute Parts

GLF201208T4R7M

TDK CorporationIn Stock: 1200GLF201208T4R7M Datasheet

Current PartRFQ

LBR2012T4R7M

Taiyo YudenIn Stock: 2992LBR2012T4R7M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the GLF201208T4R7M is determined by the following mandatory parameters:

• Inductance value of 4.7 µH with ±20% tolerance
• 0805 (2012 Metric) surface mount package footprint
• Ferrite drum core wirewound construction
• Operating temperature range compatibility (-20°C minimum to 105°C maximum)
• Current rating sufficient for circuit requirements (minimum 200 mA)
• DC resistance within acceptable circuit performance limits

The LBR2012T4R7M from Taiyo Yuden meets these core substitution criteria. While this substitute features unshielded construction compared to the original shielded design, and a lower current rating of 200 mA versus 300 mA, it maintains identical inductance, tolerance, package dimensions, and core material specifications. The unshielded configuration and reduced current rating represent trade-offs that must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The LBR2012T4R7M serves as a functional equivalent for the obsolete GLF201208T4R7M based on matching inductance, tolerance, package footprint, and core construction. Selection of this substitute requires evaluation of three specific factors:

Current Rating: The substitute part is rated for 200 mA maximum, compared to the original 300 mA rating. Circuit designs operating at currents exceeding 200 mA are not suitable for this substitute.

Shielding Configuration: The substitute features unshielded construction versus the original shielded design. Applications requiring electromagnetic shielding to prevent coupling with adjacent components or to meet EMI specifications must account for this difference.

Product Status: Both the original and substitute parts carry end-of-life or restricted design status designations. The substitute's "Not For New Designs" classification indicates limited long-term availability. For new product development, evaluation of current production alternatives with active manufacturer support is recommended.

The Taiyo Yuden LBR2012T4R7M maintains ROHS3 compliance and REACH unaffected status, consistent with the original part's regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can the LBR2012T4R7M replace the GLF201208T4R7M in all applications?

A: Substitution is valid only when circuit current requirements do not exceed 200 mA and electromagnetic shielding is not a functional requirement. Applications requiring the full 300 mA rating or shielded operation require alternative solutions.

Q: What is the impact of the unshielded design on circuit performance?

A: Unshielded inductors exhibit greater electromagnetic field radiation and susceptibility to external magnetic field coupling. Circuits sensitive to EMI or requiring isolation from adjacent high-frequency components may experience performance degradation with an unshielded substitute.

Q: Are the physical dimensions compatible for PCB layout?

A: Both parts use identical 0805 (2012 Metric) package footprints with matching length and width dimensions (2.00mm x 1.25mm). The substitute height of 1.45mm maximum versus the original 1.35mm represents a 0.10mm increase, which is typically accommodated within standard PCB assembly clearances.

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

A: The LBR2012T4R7M exhibits 240mOhm DCR compared to 740mOhm in the original part. Lower DC resistance reduces resistive losses and heat generation, which may improve circuit efficiency but does not affect inductance value or substitution eligibility.

Q: Are there compliance or certification differences between these parts?

A: Both parts are REACH unaffected and carry EAR99 ECCN classification. The substitute achieves ROHS3 compliance, while the original part's compliance status is not specified in available data. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings.