SCX147-200 Equivalent & Substitute Parts

Part Overview

The SCX147-200 is an unshielded 2-coil inductor array manufactured by Signal Transformer, designed for surface mount applications. This component provides dual inductance configurations: 78.4 µH when coils are connected in series and 20 µH when connected in parallel, with a maximum DC resistance of 55 mOhm in parallel configuration and 220 mOhm in series configuration.

The SCX147-200 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

SCX147-200

Signal TransformerIn Stock: 780SCX147-200 Datasheet

Current PartRFQ

CTX20-4-R

Eaton - Electronics DivisionIn Stock: 2118CTX20-4-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCX147-200 is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance values in both series and parallel configurations must match or fall within the ±20% tolerance band
• Current ratings must meet or exceed the original specifications in both configurations
• DC resistance (DCR) values must not exceed the maximum specifications
• Number of coils must remain at 2 to maintain circuit functionality

Mechanical Compatibility Criteria:

• Surface mount mounting type is required
• Physical dimensions and height must be compatible with existing PCB layouts
• Shielding type (unshielded) must match the original design

Compliance and Environmental Criteria:

• RoHS3 compliance is required for regulatory alignment
• Moisture sensitivity level must be acceptable for storage and handling

The CTX20-4-R from Eaton - Electronics Division meets all substitution criteria and is classified as an active product, providing improved supply chain availability compared to the obsolete SCX147-200.

Parameter Comparison

Engineering Selection Recommendations

The CTX20-4-R is a direct functional equivalent to the SCX147-200 and is the recommended substitute for new designs and ongoing production support.

Rationale:

The CTX20-4-R maintains electrical equivalence across all critical parameters. The parallel inductance of 19.6 µH falls within the ±20% tolerance specification of the original 20 µH design, ensuring functional compatibility. Series inductance, current ratings, and DC resistance specifications are identical. Both components are ROHS3 compliant and carry MSL 1 rating, meeting regulatory and environmental handling requirements.

The CTX20-4-R offers superior supply chain status as an active product with 2035 units in stock, compared to the obsolete SCX147-200 with limited remaining inventory. Physical dimensions are slightly reduced (0.550" vs 0.567" length/width; 0.250" vs 0.276" height), which may require PCB layout verification but generally provides improved space efficiency.

The CTX20-4-R is supplied in Tape & Reel packaging, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CTX20-4-R be used as a direct replacement for the SCX147-200 without circuit modifications?

A: Yes. The CTX20-4-R meets all electrical specifications of the SCX147-200. The parallel inductance difference of 0.4 µH (19.6 µH vs 20 µH) is within the ±20% tolerance band and does not require circuit redesign. Physical dimensions are slightly smaller, requiring only PCB layout verification.

Q: What is the significance of the inductance tolerance of ±20%?

A: The ±20% tolerance indicates the acceptable variation range for inductance values during manufacturing. The CTX20-4-R parallel inductance of 19.6 µH falls within the tolerance specification of the original 20 µH design, confirming functional equivalence.

Q: Are there any differences in thermal or environmental performance between these components?

A: The CTX20-4-R specifies an operating temperature range of -40°C to 85°C. The SCX147-200 does not provide an operating temperature specification in the available data. Both components carry MSL 1 rating, indicating unlimited moisture sensitivity tolerance.

Q: What are the packaging differences, and do they affect compatibility?

A: The SCX147-200 packaging type is not specified. The CTX20-4-R is supplied in Tape & Reel format, standard for automated surface mount assembly. This packaging format is compatible with standard pick-and-place equipment and does not affect electrical or mechanical compatibility.

Q: Why are the physical dimensions of the CTX20-4-R slightly smaller?

A: The CTX20-4-R dimensions (0.550" x 0.550" x 0.250") are slightly reduced compared to the SCX147-200 (0.567" x 0.567" x 0.276"). This reflects manufacturing improvements by Eaton while maintaining electrical performance. PCB layout verification is recommended to confirm fit within existing footprints.

Q: Is the CTX20-4-R suitable for high-reliability applications?

A: Both components are ROHS3 compliant and carry MSL 1 rating. The CTX20-4-R is an active product with documented specifications including operating temperature range, supporting its use in controlled production environments. Component selection for high-reliability applications should include evaluation of specific application requirements and qualification testing protocols.