LPWI252010SR33T Equivalent & Substitute Parts

Part Overview

The LPWI252010SR33T is a 330 nH shielded thin film inductor manufactured by Littelfuse Inc., rated for 5.8 A continuous current with a maximum DC resistance of 25 mOhm. This component is designed for surface mount applications in the 1008 (2520 Metric) package format. The part is currently obsolete, making identification of compatible substitute components essential for ongoing production and maintenance applications.

Substiute Parts

LPWI252010SR33T

Littelfuse Inc.In Stock: 840LPWI252010SR33T Datasheet

Current PartRFQ

TFM252012ALMAR33MTAA

TDK CorporationIn Stock: 10088TFM252012ALMAR33MTAA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LPWI252010SR33T is determined by strict equivalence across the following critical parameters:

• Inductance Value: 330 nH with ±20% tolerance
• Package Format: 1008 (2520 Metric) surface mount
• Shielding Type: Shielded construction
• Current Rating: Minimum 5.8 A continuous current capability
• Saturation Current: Minimum 6.3 A
• DC Resistance: Maximum 25 mOhm
• Core Material: Metal or metal composite construction
• Environmental Compliance: ROHS3 compliant

The TFM252012ALMAR33MTAA from TDK Corporation meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The TFM252012ALMAR33MTAA is a suitable substitute for the obsolete LPWI252010SR33T based on the following factors:

Electrical Compatibility: Both components share identical inductance values (330 nH) and tolerance specifications (±20%). The TDK substitute provides superior DC resistance performance (18 mOhm vs. 25 mOhm maximum), resulting in lower power dissipation. The saturation current rating of 7 A on the TFM252012ALMAR33MTAA exceeds the original 6.3 A specification, providing additional margin.

Mechanical Compatibility: Both inductors use the identical 1008 (2520 Metric) surface mount package with matching footprint dimensions (0.098" L x 0.079" W / 2.50mm x 2.00mm). Physical height differs slightly (1.20mm vs. 1.00mm seated height), which must be verified against PCB clearance requirements.

Compliance & Availability: The TFM252012ALMAR33MTAA is ROHS3 compliant with AEC-Q200 automotive qualification, providing enhanced reliability documentation. The part is currently in active production with substantial inventory availability (10,043 pcs), ensuring supply chain continuity.

Temperature Performance: The TDK substitute operates across an extended temperature range (-55°C to 150°C) compared to the original (-40°C to 125°C), providing additional thermal margin for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the TFM252012ALMAR33MTAA directly replace the LPWI252010SR33T on existing PCBs?

A: Yes, both components use the identical 1008 (2520 Metric) surface mount package with matching footprint dimensions. The seated height difference (1.20mm vs. 1.00mm) must be verified against PCB clearance and solder reflow profiles to ensure compatibility with existing assembly processes.

Q: What are the key electrical differences between these inductors?

A: The inductance value and tolerance are identical (330 nH ±20%). The TFM252012ALMAR33MTAA provides lower DC resistance (18 mOhm vs. 25 mOhm), resulting in reduced power loss. Saturation current is higher on the TDK part (7 A vs. 6.3 A), providing additional current handling margin.

Q: Are there any compliance or certification differences?

A: The TFM252012ALMAR33MTAA includes AEC-Q200 automotive qualification, which the original LPWI252010SR33T does not specify. Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Why is the original part obsolete?

A: The LPWI252010SR33T is listed as obsolete by Littelfuse Inc. The TFM252012ALMAR33MTAA from TDK Corporation is an active production equivalent that meets all electrical and mechanical requirements for direct substitution.

Q: What should be verified before implementing this substitute in production?

A: Verify PCB clearance for the 1.20mm seated height of the TFM252012ALMAR33MTAA. Confirm that the lower DC resistance (18 mOhm) and extended temperature range (-55°C to 150°C) are compatible with circuit design requirements. Validate solder reflow profiles and thermal cycling performance if the application operates at temperature extremes.