Equivalent & Substitute Parts for DR74-4R7-R

Part Overview

The DR74-4R7-R is a 4.7 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 3.34 A continuous current with a DC resistance of 25.4 mOhm and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings.

Substiute Parts

DR74-4R7-R

Eaton - Electronics DivisionIn Stock: 1545DR74-4R7-R Datasheet

Current PartRFQ

SLF7045T-4R7M2R0-PF

TDK CorporationIn Stock: 10464SLF7045T-4R7M2R0-PF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DR74-4R7-R is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 4.7 µH at 100 kHz test frequency
• Inductance tolerance: ±20%
• Core type: Ferrite drum core, shielded construction
• Mounting technology: Surface mount
• Package classification: Nonstandard form factor

Acceptable Variance Parameters:

• Current rating: Substitute must support minimum 3.34 A continuous operation
• DC resistance: Substitute DCR must not exceed design thermal and efficiency limits
• Saturation current: Substitute Isat must accommodate peak transient conditions
• Operating temperature: Substitute range must encompass -40°C to 125°C or be verified for application-specific requirements
• Compliance certifications: RoHS3 and REACH status must be maintained

The substitute part SLF7045T-4R7M2R0-PF meets the inductance, tolerance, core material, shielding, and mounting requirements. However, the current rating (2.1 A) and saturation current (2 A) are lower than the primary part, and the maximum operating temperature is limited to 105°C. These differences establish specific application boundaries for substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (DR74-4R7-R) Selection Criteria:

• Applications requiring continuous current operation at or above 3.34 A
• Designs operating at sustained temperatures above 105°C
• Systems where saturation current margin above 4.37 A is required
• New designs requiring Active product status and full manufacturer support

Substitute Part (SLF7045T-4R7M2R0-PF) Selection Criteria:

• Applications with maximum continuous current requirement of 2.1 A or lower
• Designs operating within -40°C to 105°C temperature envelope
• Systems where peak transient current does not exceed 2 A saturation limit
• Existing designs where component availability or supply chain optimization justifies substitution
• Note: TDK SLF7045T series carries "Not For New Designs" status; substitution is appropriate for legacy system maintenance or supply continuity only

Compliance Verification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent substitution in compliant applications.

Frequently Asked Questions (FAQ)

Q: Can SLF7045T-4R7M2R0-PF replace DR74-4R7-R in all applications?

A: No. The substitute part has lower current and saturation ratings (2.1 A and 2 A respectively versus 3.34 A and 4.37 A). Substitution is valid only for applications where the circuit current does not exceed 2.1 A continuous and peak transient current remains below 2 A. Additionally, the maximum operating temperature is limited to 105°C with the substitute part.

Q: What is the impact of the higher DC resistance in the substitute part?

A: The SLF7045T-4R7M2R0-PF exhibits 36 mOhm maximum DCR compared to 25.4 mOhm in the DR74-4R7-R. This 10.6 mOhm increase results in higher resistive losses and heat generation. Thermal analysis is required to confirm acceptability in the target application.

Q: Why is the TDK part marked "Not For New Designs"?

A: This designation indicates the SLF7045T series is in mature or declining production phase. While suitable for sustaining existing designs, it should not be selected for new product development. The Eaton DR74-4R7-R with Active status is the appropriate choice for new designs.

Q: Are the physical dimensions compatible between these parts?

A: Both parts are nonstandard form factor surface mount inductors. The DR74-4R7-R measures 7.60mm × 7.60mm × 4.35mm (height seated max), while the SLF7045T-4R7M2R0-PF measures 7.00mm × 7.00mm × 4.80mm. PCB footprint and clearance verification is required before substitution.

Q: What packaging differences exist between these parts?

A: The DR74-4R7-R is supplied in Tape & Reel (TR) packaging, while the SLF7045T-4R7M2R0-PF is available in Cut Tape (CT) and Digi-Reel® formats. Procurement and assembly process compatibility must be confirmed.

Q: Are there additional substitute options listed for the TDK part?

A: Yes. The SLF7045T-4R7M2R0-PF documentation references additional substitutes: SRR7045-4R7M, APCF000707454R7M00, APCF000707454R7T00, BPCF000707454R7M00, and BPCF000707454R7T00. These alternatives require individual parameter verification against application requirements.