LD1-4R7-R Equivalent & Substitute Parts

Part Overview

The LD1-4R7-R is a 4.7 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.57 A continuous current with a maximum DC resistance of 94 mOhm and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS Compliant, making it suitable for modern electronic applications requiring fixed inductance in compact form factors.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main component specifications, enabling direct replacement in circuit designs without functional degradation.

Substiute Parts

LD1-4R7-R

Eaton - Electronics DivisionIn Stock: 5130LD1-4R7-R Datasheet

Current PartRFQ

SDR0403-4R7ML

Bourns Inc.In Stock: 1805SDR0403-4R7ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LD1-4R7-R is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Inductance value: 4.7 µH
• Inductance tolerance: ±20%
• DC resistance: 94 mOhm maximum
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Physical footprint: 0.177" L x 0.157" W (4.50mm x 4.00mm)
• Operating temperature range: -40°C to 125°C minimum
• Moisture sensitivity level: MSL 1 or better

Current Rating Consideration: Substitute parts must maintain a current rating equal to or greater than 1.57 A to ensure equivalent or superior performance in the target application.

The SDR0403-4R7ML from Bourns Inc. satisfies all critical matching parameters and exceeds the current rating requirement, qualifying as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the LD1-4R7-R and SDR0403-4R7ML maintain Active product status, ensuring continued availability and manufacturing support. Both components are RoHS Compliant, with the Bourns substitute meeting ROHS3 specifications, satisfying current environmental and regulatory requirements.

The SDR0403-4R7ML provides enhanced performance margins with a current rating of 1.7 A compared to the 1.57 A rating of the LD1-4R7-R, and a saturation current of 2.6 A versus 2 A. These specifications indicate improved thermal and electrical headroom in the substitute component.

Physical compatibility is maintained across both parts with identical footprint dimensions of 0.177" L x 0.157" W (4.50mm x 4.00mm). The height difference of 0.012" (0.30mm) between the seated heights remains within typical PCB assembly tolerances for surface mount applications.

Both components are supplied in Tape & Reel packaging with MSL 1 rating, indicating unlimited shelf life under standard storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-4R7ML directly replace the LD1-4R7-R in existing designs?

A: Yes. Both components share identical inductance values, tolerance specifications, DC resistance ratings, core materials, and physical footprints. The substitute meets or exceeds all critical electrical parameters required for direct substitution.

Q: What is the significance of the 0.012" height difference between the two parts?

A: The LD1-4R7-R has a maximum seated height of 0.126" (3.20mm), while the SDR0403-4R7ML measures 0.138" (3.50mm). This 0.30mm difference is within standard PCB assembly tolerances and does not affect component placement or solder reflow processes in typical surface mount applications.

Q: Are both parts compliant with current environmental regulations?

A: Yes. The LD1-4R7-R is RoHS Compliant, and the SDR0403-4R7ML is ROHS3 Compliant. Both meet current environmental and regulatory requirements for electronic component manufacturing and use.

Q: How do the current ratings compare between these parts?

A: The LD1-4R7-R is rated for 1.57 A continuous current, while the SDR0403-4R7ML is rated for 1.7 A. The substitute provides a 0.13 A higher current capacity, offering improved performance margin in applications operating near the rated current limit.

Q: What is the saturation current difference, and does it matter for my application?

A: The LD1-4R7-R has a saturation current (Isat) of 2 A, while the SDR0403-4R7ML is rated at 2.6 A. Higher saturation current indicates the component can handle transient overcurrent conditions with less inductance degradation. The substitute provides 0.6 A additional saturation margin.

Q: Are the DC resistance specifications identical?

A: Yes. Both the LD1-4R7-R and SDR0403-4R7ML specify a maximum DC resistance of 94 mOhm, ensuring equivalent power dissipation and thermal performance in circuit operation.

Q: Can I use these parts interchangeably in production?

A: Yes, provided your PCB design accommodates the maximum seated height of 0.138" (3.50mm) for the Bourns substitute. Both components are supplied in Tape & Reel packaging suitable for automated assembly processes.

Q: What packaging format is used for both parts?

A: Both the LD1-4R7-R and SDR0403-4R7ML are supplied in Tape & Reel (TR) format, standard for surface mount component distribution and automated pick-and-place assembly.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both components are rated MSL 1 (Unlimited), indicating unlimited shelf life under standard storage conditions without requiring special moisture control measures.