LD1-470-R Equivalent & Substitute Parts Reference

Part Overview

The LD1-470-R is a 47 µH unshielded drum core wirewound inductor manufactured by Eaton Electronics Division, rated for 520 mA continuous current with a maximum DC resistance of 844 mOhm. This surface mount component operates across the industrial temperature range of -40°C to 125°C and maintains active product status with RoHS compliance. Substitute parts are identified when equivalent inductance values, compatible current ratings, and matching package dimensions are required for design flexibility, supply chain alternatives, or performance optimization within specified electrical parameters.

Substiute Parts

LD1-470-R

Eaton - Electronics DivisionIn Stock: 1117LD1-470-R Datasheet

Current PartRFQ

SDR0403-470KL

Bourns Inc.In Stock: 2825SDR0403-470KL Datasheet

DirectRFQ

VLCF4018T-470MR34-2

TDK CorporationIn Stock: 2637VLCF4018T-470MR34-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LD1-470-R are classified based on strict adherence to the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Inductance value: 47 µH (exact match required)
• Current rating: minimum 520 mA continuous
• Saturation current: minimum 610 mA
• DC resistance: maximum 844 mOhm
• Core material: Ferrite drum core wirewound
• Mounting type: Surface mount
• Package dimensions: 4.50mm × 4.00mm footprint (±tolerance)
• Operating temperature range: minimum -40°C to 125°C coverage

Substitution Classification:

Direct Substitute (SDR0403-470KL): Meets or exceeds all primary electrical parameters with improved current rating (540 mA) and saturation current (780 mA). DC resistance remains within specification (840 mOhm). Tolerance improved to ±10%. Identical footprint dimensions. Height variation (3.50mm vs 3.20mm) remains within nonstandard package category. Unshielded configuration matches original design.

Similar Substitute (VLCF4018T-470MR34-2): Maintains 47 µH inductance and ferrite drum core construction. Introduces shielded configuration, which alters electromagnetic behavior. Current rating reduced to 340 mA (below LD1-470-R requirement of 520 mA). Saturation current equals 340 mA (below LD1-470-R requirement of 610 mA). DC resistance improved to 760 mOhm. Footprint reduced to 4.00mm × 4.00mm. Height significantly reduced to 1.80mm. Operating temperature maximum reduced to 105°C. This part functions as a substitute only in applications where current requirements do not exceed 340 mA.

Parameter Comparison

Engineering Selection Recommendations

SDR0403-470KL (Bourns Inc.) - Primary Direct Substitute:

The SDR0403-470KL qualifies as a direct substitute for the LD1-470-R based on electrical parameter equivalence and compliance status. This part exceeds the minimum current rating requirement (540 mA vs 520 mA) and provides superior saturation current margin (780 mA vs 610 mA). The improved inductance tolerance (±10% vs ±20%) enhances circuit performance predictability. DC resistance remains within specification at 840 mOhm maximum. Both parts maintain identical -40°C to 125°C operating temperature range and RoHS/ROHS3 compliance. The height increase from 3.20mm to 3.50mm remains within nonstandard package classification and does not affect PCB assembly compatibility for standard surface mount processes. REACH unaffected status confirms regulatory compliance for European markets.

VLCF4018T-470MR34-2 (TDK Corporation) - Conditional Similar Substitute:

The VLCF4018T-470MR34-2 functions as a substitute only in applications where circuit current requirements do not exceed 340 mA continuous operation. The reduced current rating (340 mA) and saturation current (340 mA) fall below the LD1-470-R specification of 520 mA and 610 mA respectively. This part introduces shielded construction, which alters electromagnetic coupling characteristics compared to the unshielded LD1-470-R. The reduced footprint (4.00mm × 4.00mm) and significantly lower profile (1.80mm) provide space optimization benefits for compact designs. The maximum operating temperature of 105°C is 20°C lower than the LD1-470-R, restricting use in high-temperature applications. ROHS3 compliance and REACH unaffected status maintain regulatory alignment. Selection of this part requires verification that application current demands remain below 340 mA saturation threshold.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-470KL directly replace LD1-470-R without circuit modification?

A: Yes. The SDR0403-470KL meets or exceeds all electrical parameters of the LD1-470-R. The 3.50mm height versus 3.20mm does not affect standard surface mount assembly. Both parts are unshielded ferrite drum core inductors with identical 4.50mm × 4.00mm footprints and -40°C to 125°C operating ranges. No circuit redesign is required.

Q: Why is VLCF4018T-470MR34-2 listed as a similar rather than direct substitute?

A: The VLCF4018T-470MR34-2 has a maximum current rating of 340 mA and saturation current of 340 mA, both below the LD1-470-R requirement of 520 mA continuous and 610 mA saturation. This part is suitable only for lower-current applications. Additionally, the shielded construction differs from the unshielded LD1-470-R, affecting electromagnetic behavior in the circuit.

Q: What is the impact of the shielded versus unshielded configuration?

A: Shielded inductors (VLCF4018T-470MR34-2) reduce electromagnetic radiation and susceptibility to external fields, beneficial in noise-sensitive circuits. Unshielded inductors (LD1-470-R and SDR0403-470KL) have lower DC resistance and higher Q factor at frequency, preferred for efficiency-critical applications. Selection depends on circuit EMI requirements.

Q: Are all three parts RoHS compliant?

A: Yes. The LD1-470-R is RoHS Compliant. The SDR0403-470KL and VLCF4018T-470MR34-2 are both ROHS3 Compliant, representing the current RoHS directive revision. All parts are suitable for applications requiring RoHS compliance.

Q: Can VLCF4018T-470MR34-2 be used in a circuit designed for LD1-470-R if the current never exceeds 300 mA?

A: The VLCF4018T-470MR34-2 can function in such an application from a current perspective. However, the reduced operating temperature maximum (105°C vs 125°C) and shielded configuration must be evaluated against circuit requirements. If the application operates above 105°C or requires unshielded performance characteristics, this part is not suitable.

Q: What is the significance of inductance tolerance differences?

A: The SDR0403-470KL offers ±10% tolerance compared to ±20% for both LD1-470-R and VLCF4018T-470MR34-2. Tighter tolerance improves circuit performance predictability and reduces design margin requirements. Applications with strict inductance specifications benefit from the SDR0403-470KL.

Q: Are there inventory considerations for part selection?

A: The LD1-470-R has 1,078 pieces in stock, SDR0403-470KL has 2,800 pieces, and VLCF4018T-470MR34-2 has 2,542 pieces. Higher inventory availability for substitute parts may support production scheduling and supply chain continuity.

Q: What is the DC resistance impact on thermal performance?

A: Lower DC resistance reduces I²R power dissipation. The VLCF4018T-470MR34-2 (760 mOhm) dissipates less heat than LD1-470-R (844 mOhm) and SDR0403-470KL (840 mOhm). In high-current applications, this difference becomes significant. At 520 mA, the LD1-470-R dissipates approximately 228 mW, while the VLCF4018T-470MR34-2 would dissipate 205 mW if rated for that current.