LD1-270-R Equivalent & Substitute Parts

Part Overview

The LD1-270-R is a 27 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 670 mA continuous current with a maximum DC resistance of 522 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, design optimization, or supply chain considerations.

Substiute Parts

LD1-270-R

Eaton - Electronics DivisionIn Stock: 1105LD1-270-R Datasheet

Current PartRFQ

SDR0403-270KL

Bourns Inc.In Stock: 6410SDR0403-270KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LD1-270-R with the SDR0403-270KL is based on electrical and mechanical parameter equivalence within acceptable tolerances for this inductor category. Both parts share the following critical specifications:

Matching Parameters:

• Inductance value: 27 µH (identical)
• Core type: Ferrite drum core, unshielded (identical)
• Mounting: Surface mount (identical)
• Package footprint: 4.50 x 4.00 mm (identical)
• Operating temperature range: -40°C to 125°C (identical)
• RoHS compliance status: Both compliant (LD1-270-R RoHS Compliant; SDR0403-270KL ROHS3 Compliant)

Acceptable Parameter Variations:

• Current rating: LD1-270-R 670 mA vs. SDR0403-270KL 710 mA (substitute rated higher, acceptable for direct replacement)
• Saturation current: LD1-270-R 870 mA vs. SDR0403-270KL 1 A (substitute rated higher, acceptable)
• DC resistance: LD1-270-R 522 mOhm max vs. SDR0403-270KL 520 mOhm max (within equivalent range)
• Inductance tolerance: LD1-270-R ±20% vs. SDR0403-270KL ±10% (substitute offers tighter tolerance)
• Height: LD1-270-R 3.20 mm vs. SDR0403-270KL 3.50 mm (within nonstandard package variation)

Parameter Comparison

Engineering Selection Recommendations

The SDR0403-270KL from Bourns Inc. is a direct substitute for the LD1-270-R from Eaton - Electronics Division based on electrical and mechanical equivalence. Both parts maintain Active product status and full RoHS compliance, ensuring continued manufacturer support and regulatory conformance.

The SDR0403-270KL offers performance advantages including higher current rating (710 mA vs. 670 mA), higher saturation current (1 A vs. 870 mA), and tighter inductance tolerance (±10% vs. ±20%). These characteristics make the substitute suitable for applications requiring the LD1-270-R specification.

The substitute part exhibits a 0.30 mm increase in seated height (3.50 mm vs. 3.20 mm). This dimensional variation must be evaluated against specific PCB layout and clearance requirements. Both parts share identical footprint dimensions (4.50 x 4.00 mm) and mounting type, supporting direct PCB placement compatibility.

DC resistance values are equivalent (520 mOhm vs. 522 mOhm max), ensuring comparable thermal and power dissipation characteristics. Operating temperature ranges are identical across both parts, confirming thermal performance equivalence.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-270KL replace the LD1-270-R in all applications?

A: The SDR0403-270KL is electrically and mechanically equivalent to the LD1-270-R for applications requiring 27 µH inductance at 670 mA or lower continuous current. The substitute is rated for higher current (710 mA) and saturation current (1 A), making it suitable for direct replacement. The 0.30 mm height difference must be verified against PCB clearance constraints.

Q: What is the significance of the inductance tolerance difference?

A: The LD1-270-R carries ±20% inductance tolerance, while the SDR0403-270KL carries ±10% tolerance. The substitute provides tighter tolerance control, which may improve circuit performance in applications sensitive to inductance variation. Both tolerances are measured at their respective test frequencies (100 kHz for LD1-270-R, 1 kHz for SDR0403-270KL).

Q: Are there any height clearance concerns with the substitute part?

A: The SDR0403-270KL has a maximum seated height of 3.50 mm compared to the LD1-270-R at 3.20 mm. This 0.30 mm difference must be evaluated against specific PCB design constraints, component spacing, and enclosure clearances. Both parts maintain identical 4.50 x 4.00 mm footprints.

Q: Do both parts meet current regulatory requirements?

A: Yes. The LD1-270-R is RoHS Compliant, and the SDR0403-270KL is ROHS3 Compliant. Both parts carry Moisture Sensitivity Level 1 (Unlimited) and are classified under ECCN EAR99 and HTSUS 8504.50.4000. Both maintain Active product status with current manufacturer support.

Q: How do the DC resistance values compare?

A: The LD1-270-R specifies 522 mOhm maximum DC resistance, while the SDR0403-270KL specifies 520 mOhm maximum. These values are equivalent for practical circuit applications, with negligible differences in power dissipation and thermal performance.

Q: What is the packaging format for both parts?

A: Both the LD1-270-R and SDR0403-270KL are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. Both parts are classified as nonstandard package types within their respective manufacturer specifications.