LD2-270-R Equivalent & Substitute Parts

Part Overview

The LD2-270-R is a 27 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 2.81 A continuous current with a maximum DC resistance of 120 mOhm and operates across the temperature range of -40°C to 125°C. The part is currently active in production and 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 are available from alternative manufacturers, enabling procurement flexibility, inventory optimization, or supply chain continuity.

Key Parameters

Parameter	Value	Unit
Inductance	27	µH
Current Rating	2.81	A
DC Resistance (Max)	120	mOhm
Core Material	Ferrite	—
Shielding	Unshielded	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-40 to 125	°C
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the LD2-270-R is determined by the following critical parameters:

Primary Electrical Criteria:

Inductance value: 27 µH (exact match required)
DC resistance: 120 mOhm maximum (substitute must not exceed this value)
Core material: Ferrite, unshielded drum core construction
Operating temperature range: -40°C to 125°C minimum coverage

Mechanical Criteria:

Mounting type: Surface mount only
Package classification: Nonstandard drum core form factor
Tape & Reel packaging for automated assembly compatibility

Compliance Criteria:

RoHS compliance status (RoHS Compliant or ROHS3 Compliant acceptable)
Active product status preferred for long-term availability

The SDR0805-270KL from Bourns Inc. meets the core electrical and mechanical requirements for substitution. While the current rating differs (1.3 A versus 2.81 A), this represents a derating condition where the substitute part operates within acceptable thermal and saturation margins for applications not requiring the full 2.81 A capacity.

Parameter Comparison

Parameter	LD2-270-R (Eaton)	SDR0805-270KL (Bourns)	Match Status
Manufacturer Part Number	LD2-270-R	SDR0805-270KL	Different
Inductance	27 µH	27 µH	Equivalent
Inductance Tolerance	±20%	±10%	Substitute tighter
Current Rating	2.81 A	1.3 A	Substitute lower
Current - Saturation (Isat)	2.1 A	2.1 A	Equivalent
DC Resistance (Max)	120 mOhm	120 mOhm	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Operating Temperature	-40 to 125°C	-40 to 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	Nonstandard	Nonstandard	Equivalent
Size / Dimension	7.80mm L x 7.00mm W	7.80mm L x 7.80mm W	Similar footprint
Height - Seated (Max)	5.00mm	5.30mm	Substitute slightly taller
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

Primary Selection (LD2-270-R): Use the LD2-270-R when the application requires the full 2.81 A continuous current rating. This part is RoHS compliant and actively manufactured by Eaton - Electronics Division, ensuring long-term availability and supply chain stability.

Substitute Selection (SDR0805-270KL): The SDR0805-270KL from Bourns Inc. is suitable for applications where the continuous current requirement does not exceed 1.3 A. Both parts share identical inductance values, DC resistance specifications, saturation current ratings, and operating temperature ranges. The substitute offers tighter inductance tolerance (±10% versus ±20%), which may provide improved circuit performance in precision applications. Both parts maintain RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Physical Compatibility Consideration: The SDR0805-270KL has a slightly larger width (7.80mm versus 7.00mm) and greater seated height (5.30mm versus 5.00mm). PCB layout verification is required to confirm mechanical fit within the available space envelope.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-270KL replace the LD2-270-R in all applications?

A: The SDR0805-270KL is suitable only for applications where the continuous current requirement does not exceed 1.3 A. If your circuit requires the full 2.81 A rating of the LD2-270-R, the substitute part will not provide adequate current capacity and may experience thermal stress or premature failure.

Q: What is the difference in inductance tolerance between these parts?

A: The LD2-270-R has a tolerance of ±20%, while the SDR0805-270KL has ±10%. The tighter tolerance of the substitute part means inductance values will remain closer to the nominal 27 µH specification, which may improve circuit performance in applications sensitive to inductance variation.

Q: Are there physical space constraints I should consider?

A: Yes. The SDR0805-270KL is 0.80mm wider (7.80mm versus 7.00mm) and 0.30mm taller (5.30mm versus 5.00mm) than the LD2-270-R. Verify that your PCB layout and component placement can accommodate these dimensional differences before selecting the substitute.

Q: Do both parts meet current environmental compliance standards?

A: Yes. The LD2-270-R is RoHS Compliant, and the SDR0805-270KL is ROHS3 Compliant. Both parts meet current regulatory requirements for hazardous substance restrictions and are suitable for modern electronic equipment manufacturing.

Q: What is the saturation current for both parts?

A: Both the LD2-270-R and SDR0805-270KL have an identical saturation current (Isat) of 2.1 A. This parameter defines the current level at which the inductor begins to lose inductance due to core saturation.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both the LD2-270-R and SDR0805-270KL are supplied in Tape & Reel (TR) packaging, suitable for automated pick-and-place assembly processes.

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