LD1-330-R Equivalent & Substitute Parts Reference

Part Overview

The LD1-330-R is a 33 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 660 mA continuous current with a maximum DC resistance of 540 mOhm and operates across the temperature range of -40°C to 125°C. The part is RoHS Compliant and carries an Active product status, indicating current availability and manufacturer support. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to inventory constraints, supply chain considerations, or design flexibility needs while maintaining functional compatibility.

Substiute Parts

LD1-330-R

Eaton - Electronics DivisionIn Stock: 880LD1-330-R Datasheet

Current PartRFQ

SDR0403-330KL

Bourns Inc.In Stock: 7889SDR0403-330KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LD1-330-R is determined by strict alignment of the following critical parameters:

Electrical Compatibility Criteria:

• Inductance value: 33 µH (exact match required)
• DC Resistance: 540 mOhm maximum (equal or lower acceptable)
• Current Rating: minimum 640 mA (equal to or exceeding the main part's 660 mA requirement)
• Core Material: Ferrite drum core, wirewound construction
• Shielding Configuration: Unshielded

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package Footprint: 4.50 mm L x 4.00 mm W (identical)
• Height Constraint: 3.50 mm maximum seated height (accommodates PCB assembly clearance)
• Packaging Format: Tape & Reel (TR)

Compliance & Operational Criteria:

• Operating Temperature Range: -40°C to 125°C (minimum requirement)
• RoHS Compliance Status: Active product status required
• Moisture Sensitivity Level: MSL 1 (Unlimited)

The SDR0403-330KL from Bourns Inc. meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: LD1-330-R (Eaton - Electronics Division)

The LD1-330-R is the specified component and remains the first choice when available. Current inventory status shows 855 pieces in stock. This part carries Active product status with full RoHS Compliance and MSL 1 rating, confirming ongoing manufacturer support and supply stability.

Substitute Selection: SDR0403-330KL (Bourns Inc.)

The SDR0403-330KL is qualified as a direct substitute when LD1-330-R availability is constrained. This part demonstrates superior electrical performance in saturation current (990 mA versus 750 mA) and tighter inductance tolerance (±10% versus ±20%), providing design margin benefits. Current inventory availability is significantly higher at 7,847 pieces. The SDR0403-330KL carries ROHS3 Compliance and REACH Unaffected status, meeting all regulatory requirements.

Critical Compatibility Notes:

The substitute part exhibits a 0.30 mm increase in seated height (3.50 mm versus 3.20 mm). This dimension must be verified against PCB assembly clearance specifications, particularly in applications with height-constrained layouts or stacked component arrangements. The current rating differential of 20 mA (640 mA versus 660 mA) is within 3% and acceptable for most applications; however, designs operating at or near the 660 mA specification limit require thermal and current distribution analysis.

Both parts maintain identical DC resistance (540 mOhm max), core material (ferrite), shielding configuration (unshielded), and operating temperature range (-40°C to 125°C), ensuring functional equivalence in standard circuit applications.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-330KL be used as a direct replacement for LD1-330-R without circuit modification?

A: The SDR0403-330KL is electrically compatible for most applications. The 20 mA current rating difference (640 mA versus 660 mA) represents a 3% variance and is acceptable in designs with adequate thermal margin. The 0.30 mm height increase must be verified against PCB assembly constraints. No circuit modifications are required if these mechanical and thermal conditions are satisfied.

Q: What is the significance of the inductance tolerance difference (±20% versus ±10%)?

A: The SDR0403-330KL provides tighter inductance tolerance, reducing circuit performance variation. For applications sensitive to inductance accuracy, the substitute part offers improved consistency. The LD1-330-R's ±20% tolerance is acceptable for general-purpose filtering and energy storage applications where inductance variation is non-critical.

Q: Are both parts suitable for high-frequency applications?

A: The SDR0403-330KL provides frequency performance data (Q @ 2.52 MHz = 23; Self Resonant Frequency = 15 MHz), indicating suitability for applications up to approximately 5 MHz. The LD1-330-R does not provide frequency performance specifications. For applications requiring frequency response characterization, the SDR0403-330KL offers documented performance parameters.

Q: How do the saturation current ratings affect component selection?

A: The SDR0403-330KL saturation current (990 mA) exceeds the LD1-330-R (750 mA), providing greater headroom against magnetic saturation. This characteristic benefits applications with transient current spikes or dynamic load conditions. The LD1-330-R's lower saturation current requires more careful current management in such scenarios.

Q: Are there any compliance or regulatory differences between the two parts?

A: Both parts are RoHS Compliant and carry MSL 1 (Unlimited) ratings. The SDR0403-330KL additionally carries REACH Unaffected status and ROHS3 Compliance, indicating alignment with current regulatory standards. Both parts are classified under ECCN EAR99 and HTSUS 8504.50.4000.

Q: What packaging considerations apply to both parts?

A: Both LD1-330-R and SDR0403-330KL are supplied in Tape & Reel (TR) format, standard for automated PCB assembly. The identical 4.50 mm x 4.00 mm footprint ensures compatibility with existing pick-and-place programming and feeder configurations. Reel specifications and tape pitch should be verified with supplier documentation for specific assembly equipment compatibility.