LB2012T470M Equivalent & Substitute Parts

Part Overview

The LB2012T470M is a 47 µH unshielded drum core wirewound inductor manufactured by Taiyo Yuden, designed for surface mount applications in the 0805 (2012 Metric) package. This component is rated for 60 mA continuous current with a DC resistance of 3.7 Ohm and operates across a temperature range of -25°C to 105°C. The part carries a "Not For New Designs" product status, indicating that Taiyo Yuden has discontinued active development and support for this component. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support existing production requirements.

Substiute Parts

LB2012T470M

Taiyo YudenIn Stock: 209311LB2012T470M Datasheet

Current PartRFQ

L0805C470MPWST

KEMETIn Stock: 1480L0805C470MPWST Datasheet

SimilarRFQ

LQM21FN470N00L

Murata ElectronicsIn Stock: 1652LQM21FN470N00L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LB2012T470M is determined by the following critical parameters:

Primary Substitution Criteria:

• Inductance value: 47 µH (exact match required)
• Package type: 0805 (2012 Metric) surface mount (exact match required)
• Core material: Ferrite (exact match required)
• RoHS compliance: ROHS3 Compliant (required for regulatory alignment)

Secondary Compatibility Parameters:

• Current rating: Must equal or exceed 60 mA
• DC resistance: Must not exceed 3.7 Ohm
• Operating temperature range: Must encompass or exceed -25°C to 105°C
• Shielding configuration: Unshielded preferred for electromagnetic compatibility with original design

Two substitute parts meet the primary criteria with variations in secondary parameters:

1. L0805C470MPWST (KEMET): Matches inductance, package, core material, and RoHS compliance. Current rating is 50 mA (below the 60 mA requirement). DC resistance is 3.7 Ohm (equivalent). Operating temperature range is -40°C to 105°C (exceeds requirement). Product status is Obsolete.

2. LQM21FN470N00L (Murata Electronics): Matches inductance, package, core material, and RoHS compliance. Current rating is 7 mA (significantly below the 60 mA requirement). DC resistance is 780 mOhm (lower than 3.7 Ohm). Shielding is present (differs from unshielded design). Operating temperature range is -40°C to 85°C (does not meet upper temperature requirement). Product status is Active.

Parameter Comparison

Engineering Selection Recommendations

L0805C470MPWST (KEMET) - Conditional Substitute:

The L0805C470MPWST provides the closest electrical and mechanical alignment with the LB2012T470M. Both components share identical inductance (47 µH), tolerance (±20%), DC resistance (3.7 Ohm), package configuration (0805), core material (Ferrite), and self-resonant frequency (11 MHz). The KEMET part extends the lower operating temperature limit to -40°C, providing enhanced thermal performance. However, the current rating of 50 mA falls 10 mA below the original specification of 60 mA. This substitution is suitable for applications where the actual operating current does not exceed 50 mA. The Obsolete product status indicates limited future availability; inventory planning is required. ROHS3 compliance and MSL 1 rating ensure regulatory and moisture handling compatibility.

LQM21FN470N00L (Murata Electronics) - Limited Compatibility:

The LQM21FN470N00L matches the inductance value (47 µH) and package type (0805) but introduces significant deviations in secondary parameters. The current rating of 7 mA is substantially below the 60 mA requirement, making this part unsuitable for the original application's current demands. The DC resistance of 780 mOhm is lower than the 3.7 Ohm specification, which may alter circuit behavior. The shielded configuration differs from the unshielded design, potentially affecting electromagnetic coupling characteristics. The maximum operating temperature of 85°C does not meet the upper temperature requirement of 105°C. The Active product status provides long-term availability. This part is not recommended as a direct substitute for the LB2012T470M in applications requiring the specified current rating and temperature range.

Recommendation Summary:

For applications requiring strict adherence to the 60 mA current rating and 105°C upper temperature limit, the LB2012T470M should be sourced directly while inventory is available. The L0805C470MPWST serves as a viable substitute only when circuit analysis confirms that operating current remains below 50 mA. The LQM21FN470N00L is not suitable for direct substitution due to insufficient current rating and temperature range limitations.

Frequently Asked Questions (FAQ)

Q: Can the L0805C470MPWST replace the LB2012T470M in all applications?

A: The L0805C470MPWST is electrically compatible with the LB2012T470M for inductance, DC resistance, and frequency characteristics. However, the current rating difference (50 mA versus 60 mA) requires circuit-level evaluation. If your application operates at or below 50 mA, substitution is permissible. If sustained current exceeds 50 mA, the L0805C470MPWST will not meet performance specifications.

Q: Why is the LQM21FN470N00L listed as a substitute if it has only 7 mA current rating?

A: The LQM21FN470N00L shares the same inductance value (47 µH) and package type (0805), meeting the primary geometric and electrical criteria for substitution classification. However, the significantly lower current rating (7 mA) and different shielding configuration make it unsuitable for applications requiring the full 60 mA specification. This part is listed for reference only and is not recommended for direct replacement.

Q: What is the impact of shielding differences between the LB2012T470M and LQM21FN470N00L?

A: The LB2012T470M is unshielded, while the LQM21FN470N00L is shielded. Shielding reduces electromagnetic radiation and susceptibility to external fields. In circuits designed for an unshielded inductor, introducing a shielded component may alter coupling characteristics with adjacent components and circuit board traces. This difference requires circuit-level analysis before substitution.

Q: Are all three parts RoHS compliant?

A: Yes. The LB2012T470M, L0805C470MPWST, and LQM21FN470N00L are all ROHS3 Compliant, ensuring regulatory alignment for applications subject to RoHS directives.

Q: What does "Not For New Designs" status mean for the LB2012T470M?

A: "Not For New Designs" indicates that Taiyo Yuden has discontinued active development and support for this component. While existing inventory remains available, the manufacturer does not recommend this part for new product designs. For new applications, selecting an Active status part such as the LQM21FN470N00L (if specifications align) ensures long-term supplier support and availability.

Q: How do the operating temperature ranges compare?

A: The LB2012T470M operates from -25°C to 105°C. The L0805C470MPWST extends the lower limit to -40°C but maintains the 105°C upper limit. The LQM21FN470N00L operates from -40°C to 85°C, which does not meet the 105°C upper temperature requirement of the original part. For applications requiring operation at 105°C, only the LB2012T470M and L0805C470MPWST are suitable.

Q: What is the significance of the ±20% and ±30% inductance tolerances?

A: The LB2012T470M and L0805C470MPWST both carry ±20% tolerance, meaning the actual inductance value will fall between 37.6 µH and 56.4 µH. The LQM21FN470N00L carries ±30% tolerance, resulting in a range of 32.9 µH to 61.1 µH. Tighter tolerance (±20%) provides more predictable circuit behavior. Applications with strict inductance requirements should prioritize parts with ±20% tolerance.

Q: Can the L0805C470MPWST be used in high-temperature applications up to 105°C?

A: Yes. The L0805C470MPWST is rated for operation up to 105°C, matching the upper temperature limit of the LB2012T470M. This part is suitable for high-temperature applications within the specified range.