CTX300-4 Equivalent & Substitute Parts Reference

Part Overview

The CTX300-4 is an unshielded 2-coil inductor array manufactured by Eaton - Electronics Division in the OCTA-PAC® series. This surface mount component provides dual inductance configurations: 1.2 mH in series connection and 298.12 µH in parallel connection, with a maximum DC resistance of 672 mOhm in parallel configuration. The CTX300-4 is classified as obsolete product status, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity.

Substiute Parts

CTX300-4

Eaton - Electronics DivisionIn Stock: 1081CTX300-4 Datasheet

Current PartRFQ

CTX300-4-R

Eaton - Electronics DivisionIn Stock: 2588CTX300-4-R Datasheet

DirectRFQ

4448-134L

API Delevan Inc.In Stock: 11524448-134L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the CTX300-4 are identified based on strict electrical and mechanical parameter compatibility. The following criteria determine valid substitution:

Primary Substitution Criteria:

• Number of coils: 2 (mandatory match)
• Inductance values in both series and parallel configurations within tolerance specifications
• Current rating capacity equal to or exceeding the original specification
• DC resistance (DCR) values compatible with circuit requirements
• Unshielded configuration (mandatory match)
• Surface mount mounting type (mandatory match)
• Operating temperature range sufficient for application requirements
• Physical dimensions compatible with PCB layout constraints

Substitute Classification:

Direct Substitute (Packaging Variant): CTX300-4-R represents the same electrical and mechanical specifications as the CTX300-4, differentiated only by packaging format (Tape & Reel versus bulk). This component maintains identical inductance values, current ratings, and DCR specifications while offering active product status.

Similar Substitute (Parameter Tolerance): 4448-134L from API Delevan Inc. provides equivalent functional performance with minor parameter variations within acceptable engineering tolerances. The parallel inductance differs by 1.88 µH (0.63% variance from CTX300-4), tolerance specification improves to ±15%, and operating temperature range extends to -55°C to 125°C. Physical dimensions show minor variation (0.530" x 0.530" x 0.310" versus 0.550" x 0.550" x 0.250"), requiring PCB layout verification.

Parameter Comparison

Engineering Selection Recommendations

CTX300-4-R Selection Criteria:

The CTX300-4-R is the primary recommended substitute for CTX300-4 applications. This component maintains identical electrical specifications (inductance values, current ratings, and DCR parameters) and mechanical dimensions. The CTX300-4-R offers active product status, ensuring long-term availability and supply chain continuity. The component achieves ROHS3 compliance, addressing regulatory requirements for new designs. Selection of CTX300-4-R is appropriate for applications where packaging format transition from bulk to Tape & Reel is acceptable and where ROHS3 compliance is required or preferred.

4448-134L Selection Criteria:

The 4448-134L from API Delevan Inc. serves as an alternative substitute when extended operating temperature range (-55°C to 125°C) is required beyond the CTX300-4 specification (-40°C to 85°C). This component provides improved tolerance specification (±15% versus ±20%), reducing inductance value variance. Physical dimension differences (0.530" x 0.530" x 0.310" versus 0.550" x 0.550" x 0.250") require PCB layout verification to confirm footprint compatibility. The parallel inductance value of 300 µH represents a 1.88 µH increase from the CTX300-4 specification, remaining within acceptable circuit tolerance margins for most applications. The 4448-134L maintains identical series inductance (1.2 mH), current ratings, and DCR specifications. This component is classified as active product status with RoHS non-compliant designation.

Compliance Considerations:

Applications requiring ROHS3 compliance should prioritize CTX300-4-R. Applications operating in extended temperature environments should evaluate 4448-134L with PCB layout verification. Both substitute components maintain electrical performance within specified parameters.

Frequently Asked Questions (FAQ)

Q: Can CTX300-4-R be used as a direct replacement for CTX300-4?

A: Yes. CTX300-4-R provides identical electrical specifications (inductance values, current ratings, DC resistance) and mechanical dimensions (0.550" x 0.550" x 0.250"). The primary difference is packaging format: CTX300-4-R is supplied in Tape & Reel format while CTX300-4 is supplied in bulk. Both components are unshielded 2-coil inductor arrays in the OCTA-PAC® series. PCB assembly processes must accommodate Tape & Reel packaging if transitioning from bulk supply.

Q: What are the key differences between CTX300-4 and 4448-134L?

A: The 4448-134L differs in four parameters: (1) parallel inductance is 300 µH versus 298.12 µH (1.88 µH variance), (2) tolerance specification is ±15% versus ±20%, (3) operating temperature range extends to -55°C to 125°C versus -40°C to 85°C, and (4) physical dimensions are 0.530" x 0.530" x 0.310" versus 0.550" x 0.550" x 0.250". Series inductance (1.2 mH), current ratings (620 mA parallel / 310 mA series), and DC resistance values remain identical. The 4448-134L is manufactured by API Delevan Inc. rather than Eaton.

Q: Is the 1.88 µH inductance difference between CTX300-4 and 4448-134L significant?

A: The 1.88 µH difference represents 0.63% variance from the CTX300-4 parallel inductance specification of 298.12 µH. This variance falls within typical circuit tolerance margins for inductor array applications. Circuit-specific evaluation is required to confirm acceptability based on application requirements and tolerance budgets.

Q: What PCB layout considerations apply when substituting 4448-134L for CTX300-4?

A: The 4448-134L footprint differs from CTX300-4 in two dimensions: length and width are reduced from 0.550" to 0.530" (0.020" reduction), and height is increased from 0.250" to 0.310" (0.060" increase). PCB layout verification is required to confirm that the reduced footprint dimensions do not create trace routing conflicts and that the increased height does not create component clearance issues with adjacent board-level assemblies or enclosure constraints.

Q: Which substitute component should be selected for new designs?

A: CTX300-4-R is recommended for new designs requiring ROHS3 compliance and standard operating temperature range (-40°C to 85°C). The 4448-134L is recommended when extended operating temperature range (-55°C to 125°C) is required and improved tolerance specification (±15%) is beneficial. Both components maintain active product status and ensure long-term supply availability.

Q: Are there moisture sensitivity differences between substitute components?

A: CTX300-4 and CTX300-4-R both specify Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity constraints. The 4448-134L specifies MSL 5A (24 Hours), requiring moisture control during storage and handling. This difference impacts component storage requirements and assembly process planning when transitioning to 4448-134L.

Q: What is the inventory status for each component?

A: CTX300-4 (obsolete status) has 1030 pieces in stock. CTX300-4-R (active status) has 2577 pieces in stock. 4448-134L (active status) has 1124 pieces in stock. Inventory levels reflect current availability; long-term supply assurance is provided only by active-status components (CTX300-4-R and 4448-134L).