LPWI201210SR47T Equivalent & Substitute Parts

Part Overview

The LPWI201210SR47T is a 470 nH shielded thin film inductor manufactured by Littelfuse Inc., designed for surface mount applications in the 0805 (2012 Metric) package. This component is rated for 4 A continuous current with a maximum DC resistance of 33 mOhm and operates across the temperature range of -40°C to 125°C. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

LPWI201210SR47T

Littelfuse Inc.In Stock: 880LPWI201210SR47T Datasheet

Current PartRFQ

TFM201610GHM-R47MTAA

TDK CorporationIn Stock: 20331TFM201610GHM-R47MTAA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LPWI201210SR47T is determined by the following critical parameters:

Inductance Value: 470 nH with ±20% tolerance is the primary functional requirement. Substitute parts must match this inductance specification.

Shielding Type: Shielded construction is mandatory to maintain electromagnetic compatibility and noise performance in the target application.

Thin Film Technology: The thin film construction type ensures consistent performance characteristics and is a core design requirement.

Current Rating: The substitute must support the application's current demands. The main part is rated for 4 A continuous current.

DC Resistance: Lower or equivalent DCR values are acceptable; higher values may impact thermal performance and efficiency.

Package Compatibility: While the main part uses 0805 (2012 Metric), substitute packages must be physically compatible with the PCB layout and assembly process.

Compliance Standards: RoHS3 compliance is required for regulatory adherence.

The TFM201610GHM-R47MTAA from TDK Corporation meets these substitution criteria with equivalent inductance, shielding, thin film construction, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The TFM201610GHM-R47MTAA is a suitable substitute for the obsolete LPWI201210SR47T based on the following engineering criteria:

Functional Equivalence: Both components provide 470 nH inductance with ±20% tolerance and shielded thin film construction, meeting the core electrical requirements.

Current Handling: The substitute's 3.9 A continuous rating is marginally lower than the main part's 4 A rating. However, the saturation current (Isat) of 4.7 A exceeds the main part's 4.5 A, providing adequate headroom for transient conditions.

Resistance Characteristics: The substitute's 41 mOhm maximum DCR is 8 mOhm higher than the main part. This difference is within acceptable engineering tolerance for most applications but should be evaluated if thermal performance or efficiency is critical.

Regulatory Compliance: Both components are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity, ensuring compatibility with standard manufacturing and storage processes.

Product Availability: The substitute is in active production status with substantial inventory (20,300 pcs), ensuring long-term supply continuity compared to the obsolete main part.

Package Consideration: The substitute uses 0806 (2016 Metric) packaging, which is slightly larger than the 0805 (2012 Metric) main part. PCB layout verification is required to confirm physical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the TFM201610GHM-R47MTAA directly replace the LPWI201210SR47T without circuit modifications?

A: Electrical substitution is valid based on matching inductance, tolerance, shielding, and thin film construction. However, the package size difference (0806 vs. 0805) requires PCB layout verification. The slightly higher DCR (41 mOhm vs. 33 mOhm) and marginally lower continuous current rating (3.9 A vs. 4 A) must be evaluated against application requirements.

Q: What are the key parameters that determine substitution eligibility?

A: Inductance value (470 nH ±20%), shielding type (shielded), construction technology (thin film), current rating capability, DC resistance, package physical compatibility, and regulatory compliance (RoHS3) are the primary substitution criteria.

Q: Does the package size difference affect performance?

A: Package size differences do not affect electrical performance but impact PCB layout and assembly. The 0806 (2016 Metric) substitute is larger than the 0805 (2012 Metric) main part. Verify that the PCB footprint and surrounding component placement accommodate the larger package dimensions (2.00mm L x 1.60mm W vs. 2.00mm L x 1.20mm W).

Q: Is the 8 mOhm increase in DCR significant?

A: The DCR increase from 33 mOhm to 41 mOhm represents approximately 24% higher resistance. For applications where thermal dissipation or efficiency is critical, this difference should be calculated against expected current levels and thermal budget constraints.

Q: Are both components suitable for the same temperature range?

A: Yes, both components operate across -40°C to 125°C, providing equivalent thermal performance specifications.

Q: What is the significance of the saturation current (Isat) difference?

A: The substitute's higher Isat (4.7 A vs. 4.5 A) provides better transient current handling capability, which is advantageous for applications experiencing current spikes or surge conditions.