GLFR1608T470M-LR Equivalent & Substitute Parts

Part Overview

The GLFR1608T470M-LR is a 47 µH shielded inductor manufactured by TDK Corporation, rated for 100 mA with a DC resistance of 2.3Ohm in a 0603 (1608 Metric) surface mount package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. Substitute parts must maintain the same inductance value, package footprint, and operating temperature range while accommodating variations in current rating, DC resistance, and shielding characteristics.

Key Parameters

Parameter	Value
Inductance	47 µH
Inductance Tolerance	±20%
Current Rating	100 mA
DC Resistance (DCR)	2.3Ohm
Shielding	Shielded
Package / Case	0603 (1608 Metric)
Operating Temperature Range	-40°C ~ 105°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the GLFR1608T470M-LR is determined by the following mandatory parameters:

Inductance value: 47 µH (fixed requirement)
Package / Case: 0603 (1608 Metric) (fixed requirement)
Operating Temperature Range: -40°C ~ 105°C (fixed requirement)
RoHS Status: ROHS3 Compliant (fixed requirement)

Allowable variations in substitute parts include:

Current Rating: May exceed the original 100 mA specification
DC Resistance (DCR): Acceptable within ±0.5Ohm of the original 2.3Ohm value
Shielding: Unshielded alternatives are acceptable if circuit design permits
Inductance Tolerance: ±10% or ±20% both acceptable
Product Status: Obsolete or Not For New Designs acceptable for replacement applications

Parameter Comparison

Parameter	GLFR1608T470M-LR (TDK)	L0603B470MDWFT (KEMET)	LBMF1608T470K (Taiyo Yuden)
Inductance	47 µH	47 µH	47 µH
Inductance Tolerance	±20%	±20%	±10%
Current Rating (Amps)	100 mA	140 mA	35 mA
DC Resistance (DCR)	2.3Ohm	2.5Ohm	2.5Ohm
Shielding	Shielded	Unshielded	Unshielded
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)
Size / Dimension	0.063" L x 0.031" W (1.60mm x 0.80mm)	0.063" L x 0.031" W (1.60mm x 0.80mm)	0.063" L x 0.031" W (1.60mm x 0.80mm)
Height - Seated (Max)	0.039" (1.00mm)	0.039" (1.00mm)	0.039" (1.00mm)
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

L0603B470MDWFT (KEMET): This substitute provides a higher current rating of 140 mA, exceeding the original 100 mA specification. The DC resistance of 2.5Ohm is within acceptable tolerance. The primary consideration is the transition from shielded to unshielded construction; circuit-level electromagnetic compatibility assessment is required if the original shielding was specified for noise mitigation. ROHS3 compliance and identical operating temperature range support direct substitution in compliant applications.

LBMF1608T470K (Taiyo Yuden): This substitute features a lower current rating of 35 mA, which is below the original 100 mA specification and represents a significant derating. The ±10% inductance tolerance provides tighter specification control compared to the original ±20%. The unshielded construction and identical package footprint support mechanical compatibility. ROHS3 compliance and matching operating temperature range are confirmed. This part is classified as Not For New Designs, limiting its applicability to legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can L0603B470MDWFT replace GLFR1608T470M-LR in all applications?

A: L0603B470MDWFT is mechanically and electrically compatible for applications where the unshielded construction does not compromise electromagnetic performance. The higher current rating of 140 mA provides design margin. DC resistance variation of 0.2Ohm is within typical circuit tolerance. Shielding removal may affect high-frequency noise performance in sensitive circuits.

Q: Is LBMF1608T470K suitable as a direct replacement?

A: LBMF1608T470K meets package and temperature specifications but has a maximum current rating of 35 mA, significantly below the original 100 mA. This part is suitable only for applications where circuit current requirements do not exceed 35 mA. The Not For New Designs status restricts use to maintenance of existing systems.

Q: What is the impact of changing from shielded to unshielded inductors?

A: Unshielded inductors exhibit increased electromagnetic field radiation and susceptibility to external magnetic fields. Circuit-level analysis is required to determine if the original shielding specification was critical for noise immunity or EMI compliance. PCB layout modifications may be necessary to maintain performance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both L0603B470MDWFT and LBMF1608T470K are ROHS3 compliant, matching the original GLFR1608T470M-LR specification.

Q: What is the significance of inductance tolerance differences?

A: The original part specifies ±20% tolerance. L0603B470MDWFT maintains ±20%, while LBMF1608T470K provides tighter ±10% tolerance. Tighter tolerance may improve circuit performance in applications sensitive to inductance variation but does not affect substitution eligibility.

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