SPM5020T-2R2M Equivalent & Substitute Parts

Part Overview

The SPM5020T-2R2M is a 2.2 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 4.2 A continuous current with a maximum DC resistance of 51.4 mOhm. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility across inductance value, current rating, shielding characteristics, and surface mount packaging specifications.

Substiute Parts

SPM5020T-2R2M

TDK CorporationIn Stock: 1876SPM5020T-2R2M Datasheet

Current PartRFQ

SPM5020T-2R2M-LR

TDK CorporationIn Stock: 7757SPM5020T-2R2M-LR Datasheet

MFR RecommendedRFQ

PA4345.152NLT

Pulse ElectronicsIn Stock: 6976PA4345.152NLT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPM5020T-2R2M are evaluated based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Inductance value: 2.2 µH (±20% tolerance acceptable)
• Shielding requirement: Shielded configuration mandatory
• Current rating: Minimum 4.2 A continuous current
• DC resistance: Lower or equal to 51.4 mOhm preferred for thermal performance
• Saturation current: Minimum 5.5 A
• Surface mount packaging with compatible footprint dimensions
• Operating temperature range: -40°C to 125°C minimum
• RoHS3 compliance and MSL 1 rating

Identified Substitute Categories:

1. MFR Recommended Substitute (TDK SPM-LR Series): SPM5020T-2R2M-LR maintains identical inductance, shielding type, and core construction while offering improved electrical performance (higher current rating, lower DCR) within the same physical envelope. Active product status ensures long-term availability.

2. Direct Manufacturer Substitute (Pulse Electronics PA4345 Series): PA4345.152NLT provides equivalent inductance with enhanced current handling capability. Substitution requires evaluation of core type transition (molded vs. drum core) and dimensional compatibility, though physical footprint remains within acceptable tolerance.

Parameter Comparison

Engineering Selection Recommendations

SPM5020T-2R2M-LR (Primary Recommendation): This part is the manufacturer-recommended successor to the obsolete SPM5020T-2R2M. It maintains identical inductance specification (2.2 µH) and physical footprint (5.40 × 5.10 × 2.00 mm), ensuring direct PCB compatibility without layout modifications. The SPM-LR variant offers superior electrical performance with increased current rating (4.6 A vs. 4.2 A) and reduced DC resistance (40.7 mOhm vs. 51.4 mOhm), resulting in lower thermal dissipation. Active product status guarantees long-term procurement availability and supply chain stability. ROHS3 compliance and MSL 1 rating match the original specification. Selection of this part eliminates design risk and procurement uncertainty.

PA4345.152NLT (Alternative Consideration): This Pulse Electronics inductor provides enhanced current handling (5.5 A) and superior DC resistance performance (30.5 mOhm). However, the inductance value is 1.5 µH, representing a 32% reduction from the 2.2 µH specification. This substitution is applicable only in circuit designs where the lower inductance value remains functionally acceptable within the application's operating parameters. The molded core construction differs from the original drum core wirewound design. Physical dimensions increase to 6.00 × 5.40 × 2.00 mm, requiring PCB footprint verification. Extended operating temperature range (-55°C to 125°C) provides additional thermal margin. This part is suitable for applications where inductance tolerance and footprint constraints permit deviation from the original specification.

Frequently Asked Questions (FAQ)

Q: Can SPM5020T-2R2M-LR be used as a direct replacement without PCB modifications?

A: Yes. The SPM5020T-2R2M-LR maintains identical physical dimensions (5.40 × 5.10 × 2.00 mm) and inductance value (2.2 µH ±20%) as the original SPM5020T-2R2M. No PCB layout changes are required. The part is a direct footprint and functional equivalent.

Q: What is the key difference between SPM5020T-2R2M-LR and PA4345.152NLT?

A: SPM5020T-2R2M-LR maintains the original 2.2 µH inductance specification with identical physical footprint. PA4345.152NLT provides 1.5 µH inductance with a larger footprint (6.00 × 5.40 mm). Selection depends on whether the circuit design can accommodate the lower inductance value and increased physical dimensions.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both SPM5020T-2R2M-LR and PA4345.152NLT are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory specifications.

Q: Which substitute part offers the best thermal performance?

A: PA4345.152NLT provides the lowest DC resistance (30.5 mOhm), followed by SPM5020T-2R2M-LR (40.7 mOhm). Lower DC resistance reduces resistive heating during operation. However, this advantage must be weighed against the inductance value change in PA4345.152NLT.

Q: Is the SPM5020T-2R2M-LR available in the same packaging format as the original?

A: SPM5020T-2R2M-LR is supplied in Cut Tape (CT) and Digi-Reel® packaging, whereas the original SPM5020T-2R2M packaging format is not specified in available data. Verify packaging compatibility with your procurement and assembly requirements.

Q: What is the saturation current margin for each substitute?

A: SPM5020T-2R2M operates at 4.2 A continuous with 5.5 A saturation (1.31× margin). SPM5020T-2R2M-LR provides 4.6 A continuous with 7.0 A saturation (1.52× margin). PA4345.152NLT provides 5.5 A continuous with 9.8 A saturation (1.78× margin). Higher saturation margins provide greater protection against transient current spikes.