CTX32T-3R9-R Equivalent & Substitute Parts

Part Overview

The CTX32T-3R9-R is a 3.9 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 250 mA at 1.3Ohm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across inductance value, current rating, DC resistance, and operating frequency characteristics while accommodating mechanical and thermal requirements.

Substiute Parts

CTX32T-3R9-R

Eaton - Electronics DivisionIn Stock: 899CTX32T-3R9-R Datasheet

Current PartRFQ

1210-392J

API Delevan Inc.In Stock: 8521210-392J Datasheet

SimilarRFQ

CM322522-3R9JL

Bourns Inc.In Stock: 944CM322522-3R9JL Datasheet

SimilarRFQ

CM322522-3R9KL

Bourns Inc.In Stock: 840CM322522-3R9KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CTX32T-3R9-R is determined by the following critical parameters:

Primary Electrical Criteria:

• Inductance value: 3.9 µH (exact match required)
• DC Resistance: 1.3Ohm maximum (must not exceed)
• Shielding configuration: Unshielded (must match)
• Q factor and self-resonant frequency within acceptable operating range

Current Rating Consideration: Substitute parts must support the application's current demand. The main part is rated at 250 mA. Substitute parts with equal or higher current ratings are electrically compatible. Parts with lower current ratings (175 mA) are compatible only if the application current does not exceed the substitute's rating.

Mechanical Compatibility:

• Package type: 1210 (3225 Metric) surface mount
• Physical dimensions and height must accommodate PCB layout constraints
• Mounting type: Surface mount (fixed requirement)

Environmental and Compliance Factors:

• Operating temperature range must encompass application requirements
• RoHS and REACH compliance status affects regulatory acceptability
• Moisture sensitivity level (MSL): All candidates are MSL 1 (Unlimited)

Parameter Comparison

Engineering Selection Recommendations

1210-392J (API Delevan Inc.)

This part is electrically compatible with the CTX32T-3R9-R across all critical parameters: identical 3.9 µH inductance, 1.3Ohm maximum DC resistance, and unshielded configuration. The 1210 (3225 Metric) package provides direct mechanical compatibility. The 378 mA current rating exceeds the original 250 mA specification, providing operational margin. The ±5% tolerance is tighter than the original ±20%, improving circuit predictability. Extended operating temperature range (-55°C ~ 125°C) accommodates broader environmental conditions. However, RoHS non-compliance status must be evaluated against regulatory requirements for the end application.

CM322522-3R9JL (Bourns Inc.)

This part maintains the required 3.9 µH inductance, 1.3Ohm DC resistance, and unshielded shielding configuration. The ±5% tolerance provides improved precision. ROHS3 compliance and REACH unaffected status satisfy modern regulatory requirements. Operating temperature range (-40°C ~ 125°C) exceeds the original specification. The 175 mA current rating is lower than the original 250 mA; this part is suitable only for applications where circuit current does not exceed 175 mA. The nonstandard package designation requires physical verification against PCB layout constraints, though stated dimensions (0.126" L x 0.098" W, 0.087" height) match the original.

CM322522-3R9KL (Bourns Inc.)

Electrical specifications are identical to CM322522-3R9JL with the exception of ±10% tolerance (versus ±5%). All other considerations regarding current rating limitation (175 mA), regulatory compliance (ROHS3, REACH unaffected), and package compatibility apply identically. The ±10% tolerance provides a middle ground between the original ±20% and the tighter ±5% alternative.

Frequently Asked Questions (FAQ)

Q: Can the 1210-392J replace the CTX32T-3R9-R in all applications?

A: The 1210-392J is electrically and mechanically compatible with the CTX32T-3R9-R for applications where circuit current does not exceed 250 mA. The higher 378 mA rating provides operational margin. RoHS non-compliance must be evaluated against application regulatory requirements.

Q: Why do the Bourns CM322522 parts have lower current ratings (175 mA) than the original?

A: The CM322522-3R9JL and CM322522-3R9KL are rated at 175 mA maximum current. These parts are suitable only for circuits where the operating current does not exceed this limit. If the application requires 250 mA operation, the 1210-392J is the appropriate substitute.

Q: What is the difference between CM322522-3R9JL and CM322522-3R9KL?

A: Both parts are identical except for inductance tolerance: CM322522-3R9JL is ±5% and CM322522-3R9KL is ±10%. Selection depends on circuit tolerance requirements. The ±5% version provides tighter inductance control; the ±10% version offers cost optimization for less stringent applications.

Q: Are the Bourns parts in a standard 1210 package?

A: The Bourns CM322522 series is designated as nonstandard package, though physical dimensions (0.126" L x 0.098" W, 0.087" height) are identical to standard 1210 (3225 Metric). Physical verification against PCB footprint is required before design implementation.

Q: Which substitute part offers the best regulatory compliance?

A: The Bourns CM322522-3R9JL and CM322522-3R9KL both carry ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The 1210-392J is RoHS non-compliant and must be evaluated against specific application regulatory constraints.

Q: Can I use these substitutes interchangeably in existing designs?

A: Interchangeability depends on three factors: (1) circuit current requirement must not exceed the substitute's rating, (2) package designation (standard 1210 versus nonstandard) must match PCB layout, and (3) regulatory compliance status must satisfy application requirements. Electrical parameters (inductance, DC resistance, frequency response) are compatible across all three substitutes.