SC52LC-680 Equivalent & Substitute Parts

Part Overview

The SC52LC-680 is a 68 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications requiring fixed inductance in compact form factors. This component is rated for 480 mA continuous current with a maximum DC resistance of 1.13 Ohm and operates across the industrial temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS3 compliant, making it suitable for modern electronic assemblies. Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining functional compatibility in the target application.

Key Parameters

Parameter	Value	Unit
Inductance	68	µH
Inductance Tolerance	±20%	%
Current Rating	480	mA
DC Resistance (Max)	1.13	Ohm
Saturation Current	300	mA
Shielding	Shielded	—
Operating Temperature	-40 to 125	°C
Mounting Type	Surface Mount	—
Package	Nonstandard	—
RoHS Status	RoHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SC52LC-680 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Inductance value of 68 µH within the ±20% tolerance band (54.4 µH to 82.8 µH)
Current rating of 460 mA or higher to support the 480 mA nominal requirement
DC resistance not exceeding 1.13 Ohm to maintain circuit performance
Operating temperature range covering -40°C to 125°C minimum
Inductance measurement frequency at 100 kHz

Mechanical & Compliance Criteria:

Surface mount packaging configuration
Nonstandard form factor compatibility
RoHS compliance status (RoHS3 or RoHS Compliant acceptable)
Moisture sensitivity level MSL 1 (Unlimited)

The LD1-680-R from Eaton - Electronics Division meets these substitution criteria with equivalent inductance, compatible current handling, and matching operating temperature specifications.

Parameter Comparison

Parameter	SC52LC-680 (Signal Transformer)	LD1-680-R (Eaton)	Compatibility
Inductance	68 µH	68 µH	Exact Match
Inductance Tolerance	±20%	±20%	Exact Match
Current Rating	480 mA	460 mA	Within 4% Margin
DC Resistance (Max)	1.13 Ohm	1.12 Ohm	Equivalent
Saturation Current	300 mA	520 mA	LD1-680-R Higher
Shielding	Shielded	Unshielded	Different
Operating Temperature	-40 to 125°C	-40 to 125°C	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
Package	Nonstandard	Nonstandard	Exact Match
RoHS Status	RoHS3 Compliant	RoHS Compliant	Both Compliant
Inductance Test Frequency	100 kHz	100 kHz	Exact Match

Engineering Selection Recommendations

The LD1-680-R qualifies as a functional substitute for the SC52LC-680 based on electrical parameter equivalence and compliance status. Both components maintain Active product status and satisfy RoHS requirements for regulated markets.

Selection Considerations:

The primary distinction between these parts is the shielding configuration. The SC52LC-680 features shielding, while the LD1-680-R is unshielded. This difference affects electromagnetic field containment and susceptibility to external interference. Applications requiring shielding for noise isolation or EMI mitigation should retain the SC52LC-680. Applications where shielding is not a functional requirement may utilize the LD1-680-R.

The LD1-680-R exhibits a saturation current of 520 mA compared to the SC52LC-680's 300 mA, providing additional headroom in high-current transient conditions. The current rating difference of 20 mA (460 mA versus 480 mA) represents a 4% margin and remains within acceptable tolerance for most circuit designs operating at nominal current levels.

Both components are rated for identical operating temperature ranges and feature equivalent DC resistance characteristics, ensuring thermal and resistive performance parity.

Frequently Asked Questions (FAQ)

Q: Can the LD1-680-R replace the SC52LC-680 in all applications?

A: The LD1-680-R is electrically equivalent for inductance, current handling, and temperature performance. However, the unshielded design of the LD1-680-R differs from the shielded SC52LC-680. Substitution is appropriate only when shielding is not required for circuit function or EMI compliance.

Q: What is the significance of the 20 mA current rating difference?

A: The SC52LC-680 is rated for 480 mA while the LD1-680-R is rated for 460 mA. This 4% difference is marginal for circuits operating at nominal current levels. Applications requiring the full 480 mA rating should use the SC52LC-680.

Q: Are both parts RoHS compliant?

A: Yes. The SC52LC-680 is RoHS3 compliant, and the LD1-680-R is RoHS compliant. Both satisfy regulatory requirements for restricted substance elimination.

Q: How do the saturation current specifications affect substitution?

A: The LD1-680-R has a higher saturation current (520 mA) compared to the SC52LC-680 (300 mA). This provides greater tolerance to current transients in the LD1-680-R. For applications with predictable current profiles, this difference is not a limiting factor.

Q: What is the package compatibility between these parts?

A: Both components use nonstandard surface mount packages. Physical dimensions differ slightly: SC52LC-680 measures 5.30mm × 5.30mm × 2.00mm, while LD1-680-R measures 4.50mm × 4.00mm × 3.20mm. PCB layout and clearance verification is required before substitution.

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

A: Yes. Both the SC52LC-680 and LD1-680-R are rated MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

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