DR127-3R3 Equivalent & Substitute Parts

Part Overview

The DR127-3R3 is a 3.3 µH shielded drum core, wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 10.5 A continuous current with a saturation current of 21.5 A and features a DC resistance of 5.67 mOhm. The part operates across a temperature range of -40°C to 125°C and is specified for inductance testing at 100 kHz.

The DR127-3R3 is classified as obsolete. Locating direct replacements or functionally equivalent alternatives is necessary for ongoing production support, design revisions, and inventory management. Substitute parts must maintain electrical performance within acceptable tolerances while meeting current manufacturing and compliance standards.

Substiute Parts

DR127-3R3

Eaton - Electronics DivisionIn Stock: 811DR127-3R3 Datasheet

Current PartRFQ

DR127-3R3-R

Eaton - Electronics DivisionIn Stock: 4289DR127-3R3-R Datasheet

DirectRFQ

SLF12575T-2R7N7R0-PF

TDK CorporationIn Stock: 1994SLF12575T-2R7N7R0-PF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DR127-3R3 are evaluated based on the following critical parameters:

Primary Substitution Criteria:

• Inductance value within tolerance band
• Current rating sufficient for application requirements
• DC resistance compatible with circuit performance
• Core material and shielding type
• Surface mount package compatibility
• Operating temperature range coverage
• Physical dimensions and height constraints

Substitution Categories:

Direct Equivalent: Parts maintaining identical electrical specifications, core construction, and package dimensions. The DR127-3R3-R qualifies as a direct equivalent, offering the same inductance (3.3 µH), current rating (10.5 A), and DC resistance (5.67 mOhm) with improved product status and compliance.

Similar Functional Equivalent: Parts with comparable but not identical electrical parameters. The SLF12575T-2R7N7R0-PF from TDK Corporation provides similar core construction and package footprint but operates at reduced inductance (2.7 µH), current rating (7 A), and increased DC resistance (11.3 mOhm). This part is suitable only for applications where the lower electrical specifications are acceptable.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement:

The DR127-3R3-R is the primary substitute for the obsolete DR127-3R3. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical specifications: 3.3 µH inductance, 10.5 A current rating, and 5.67 mOhm DC resistance. The DR127-3R3-R is classified as Active product status and is ROHS3 compliant, addressing regulatory and supply chain concerns associated with the obsolete main part. Physical dimensions and operating temperature ranges are identical, ensuring direct board-level compatibility. This part is suitable for all applications currently using the DR127-3R3.

For Functional Substitution:

The SLF12575T-2R7N7R0-PF from TDK Corporation is classified as Not For New Designs and is suitable only for legacy system support or applications where reduced electrical specifications are acceptable. This part operates at 2.7 µH inductance (18% lower than the main part), 7 A current rating (33% lower), and 11.3 mOhm maximum DC resistance (99% higher). The operating temperature range is limited to -40°C to 105°C, which is 20°C lower than the main part's maximum. The SLF12575T-2R7N7R0-PF is ROHS3 compliant and maintains compatible surface mount packaging and physical footprint. Selection of this part requires circuit-level analysis to confirm that reduced inductance, current capacity, and increased resistance do not degrade system performance.

Frequently Asked Questions (FAQ)

Q: Can the DR127-3R3-R be used as a direct replacement for the DR127-3R3?

A: Yes. The DR127-3R3-R is a direct equivalent offering identical inductance (3.3 µH), current rating (10.5 A), DC resistance (5.67 mOhm), operating temperature range (-40°C to 125°C), and physical dimensions (12.50 × 12.50 × 8.00 mm). The DR127-3R3-R is manufactured by the same supplier (Eaton - Electronics Division) and is classified as Active product status with ROHS3 compliance, making it the recommended replacement for the obsolete DR127-3R3.

Q: What are the limitations of using the SLF12575T-2R7N7R0-PF as a substitute?

A: The SLF12575T-2R7N7R0-PF operates at reduced electrical specifications: 2.7 µH inductance (versus 3.3 µH), 7 A current rating (versus 10.5 A), and 11.3 mOhm maximum DC resistance (versus 5.67 mOhm). The maximum operating temperature is 105°C, which is 20°C lower than the main part. This part is classified as Not For New Designs. Substitution is limited to applications where these reduced specifications do not compromise circuit performance. Circuit-level analysis is required to confirm compatibility.

Q: Are the physical dimensions compatible between all three parts?

A: The DR127-3R3 and DR127-3R3-R share identical dimensions: 12.50 × 12.50 mm footprint with 8.00 mm maximum seated height. The SLF12575T-2R7N7R0-PF has the same footprint (12.50 × 12.50 mm) but a slightly lower seated height of 7.85 mm. All three parts are surface mount components with compatible package footprints suitable for the same PCB layout.

Q: What is the difference in inductance test frequency between the parts?

A: The DR127-3R3 and DR127-3R3-R are tested at 100 kHz, while the SLF12575T-2R7N7R0-PF is tested at 1 kHz. This difference reflects different measurement standards between manufacturers. When comparing inductance values across parts, the test frequency should be considered in circuit design analysis, particularly for applications sensitive to frequency-dependent inductance behavior.

Q: Are all substitute parts RoHS compliant?

A: The DR127-3R3 (main part) is RoHS non-compliant. The DR127-3R3-R and SLF12575T-2R7N7R0-PF are both ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the DR127-3R3-R or SLF12575T-2R7N7R0-PF must be selected.

Q: What is the tolerance difference between the main part and substitutes?

A: The DR127-3R3 and DR127-3R3-R both specify ±20% inductance tolerance. The SLF12575T-2R7N7R0-PF specifies ±30% inductance tolerance, representing a wider tolerance band. For applications requiring tighter inductance control, the Eaton parts are preferred.