CTX32CT-330-R Equivalent & Substitute Parts Reference

Part Overview

The CTX32CT-330-R is a 33 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, designed for surface mount applications in the 1210 (3225 Metric) package format. This component operates at 170 mA current rating with a maximum DC resistance of 1.65 Ohm and is rated for operating temperatures from -25°C to 85°C.

The CTX32CT-330-R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this inductor specification is required.

Substiute Parts

CTX32CT-330-R

Eaton - Electronics DivisionIn Stock: 1094CTX32CT-330-R Datasheet

Current PartRFQ

CM322522-330JL

Bourns Inc.In Stock: 1011CM322522-330JL Datasheet

SimilarRFQ

CM322522-330KL

Bourns Inc.In Stock: 75404CM322522-330KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CTX32CT-330-R must satisfy the following critical parameters to ensure functional equivalence:

Mandatory Matching Parameters:

• Inductance value: 33 µH (exact match required)
• Package format: 1210 (3225 Metric) surface mount
• Physical dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm), Height 0.087" (2.20mm) maximum
• Mounting type: Surface mount
• Shielding configuration: Unshielded

Allowable Variation Parameters:

• Current rating: Substitute must support minimum 170 mA operation
• DC resistance: Substitute specifications must be evaluated against circuit requirements
• Core material: Alternative core materials (ferrite vs. ceramic) are permissible if inductance and frequency characteristics are maintained
• Operating temperature range: Substitute range must encompass or exceed -25°C to 85°C
• Inductance tolerance: ±10% or tighter tolerance acceptable

The identified substitute parts CM322522-330JL and CM322522-330KL from Bourns Inc. share the same inductance value, package dimensions, and surface mount configuration. Both are active products with enhanced temperature operating ranges and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility Assessment:

The CM322522-330JL and CM322522-330KL inductors from Bourns Inc. provide functional equivalence for the obsolete CTX32CT-330-R in applications where current requirements do not exceed their respective ratings.

Critical Consideration - Current Rating Limitation:

The CTX32CT-330-R operates at 170 mA, while both Bourns substitutes operate at significantly lower current ratings (CM322522-330JL: 85 mA; CM322522-330KL: 70 mA). Substitution is only valid for circuits operating at or below the substitute part's current rating. Applications requiring the full 170 mA capability cannot use these substitutes without circuit redesign.

DC Resistance Differential:

The CTX32CT-330-R exhibits 1.65 Ohm maximum DC resistance, while both Bourns substitutes specify 5.6 Ohm maximum. This 3.4× increase in resistance will result in higher power dissipation and voltage drop across the inductor. Circuit analysis is required to confirm acceptable performance with the higher resistance value.

Compliance and Product Status:

Both CM322522-330JL and CM322522-330KL are active products with RoHS3 compliance and REACH unaffected status, providing supply chain continuity and regulatory compliance advantages over the obsolete CTX32CT-330-R.

Temperature Operating Range:

Both Bourns substitutes support extended operating temperature ranges (-40°C ~ 125°C) compared to the original part (-25°C ~ 85°C), providing enhanced thermal margin for applications operating at temperature extremes.

Frequently Asked Questions (FAQ)

Q: Can CM322522-330JL or CM322522-330KL be used as direct drop-in replacements for CTX32CT-330-R?

A: Physical and dimensional compatibility is confirmed. However, the significantly lower current ratings (85 mA and 70 mA respectively versus 170 mA) and higher DC resistance (5.6 Ohm versus 1.65 Ohm) require circuit-level evaluation. Direct substitution is only valid if the application operates within the substitute part's current and resistance specifications.

Q: What is the impact of the higher DC resistance in the Bourns substitutes?

A: The 5.6 Ohm DC resistance in CM322522-330JL and CM322522-330KL will increase power dissipation by a factor of approximately 3.4 compared to the 1.65 Ohm CTX32CT-330-R. Power dissipation increases with the square of current (P = I²R). At 85 mA, the Bourns part dissipates approximately 40.6 mW; at 70 mA, approximately 27.3 mW. The original part at 170 mA dissipates approximately 47.6 mW. Thermal management and circuit performance must be verified.

Q: Are there differences in inductance tolerance between the substitute parts?

A: Yes. The CTX32CT-330-R and CM322522-330KL both specify ±10% tolerance, while CM322522-330JL specifies ±5% tolerance. The tighter tolerance of CM322522-330JL may provide improved circuit performance in applications sensitive to inductance variation.

Q: What is the significance of the different core materials (ceramic vs. ferrite)?

A: The CTX32CT-330-R uses ceramic core material, while both Bourns substitutes use ferrite core material. Both materials achieve the specified 33 µH inductance and unshielded configuration. The ferrite core in the Bourns parts exhibits higher Q factor (30 @ 2.52MHz versus 15 @ 2.52MHz), indicating lower losses at the test frequency. Frequency response characteristics differ slightly, with the Bourns parts showing higher self-resonant frequency (20 MHz and 17 MHz versus 17 MHz).

Q: Are the package designations truly equivalent?

A: The CTX32CT-330-R specifies package format as "1210 (3225 Metric)," while the Bourns parts specify "Nonstandard." However, all three parts share identical physical dimensions (0.126" L x 0.098" W / 3.20mm x 2.50mm) and height (0.087" / 2.20mm maximum). The dimensional equivalence confirms PCB footprint compatibility, though the package designation difference should be noted in design documentation.

Q: Which substitute part should be selected if current rating is the primary constraint?

A: If the application requires operation at or below 85 mA, CM322522-330JL is suitable. If the application requires operation at or below 70 mA, CM322522-330KL is suitable. Neither substitute accommodates the full 170 mA rating of the original part. If higher current capability is required, alternative inductors with higher current ratings must be evaluated.

Q: What compliance advantages do the Bourns substitutes offer?

A: Both CM322522-330JL and CM322522-330KL are RoHS3 compliant and REACH unaffected, providing regulatory compliance for modern manufacturing and environmental standards. The obsolete CTX32CT-330-R does not specify these compliance certifications. Both Bourns parts maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the original part.