CTX32T-2R2-R Equivalent & Substitute Parts

Part Overview

The CTX32T-2R2-R is a 2.2 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 is rated for 320 mA maximum current with 1 Ohm maximum DC resistance and operates across a temperature range of -25°C to 85°C. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Tolerance	±20%
Current Rating	320 mA
DC Resistance (Max)	1 Ohm
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature	-25°C ~ 85°C
Q @ Frequency	30 @ 7.96 MHz
Self Resonant Frequency	75 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the CTX32T-2R2-R is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 2.2 µH (exact match required)
Package format: 1210 (3225 Metric) surface mount
Shielding configuration: Unshielded
Physical dimensions: Compatible with 1210 footprint
DC resistance: Maximum 1 Ohm

Secondary Compatibility Factors:

Current rating: Must equal or exceed 320 mA
Operating temperature range: Must encompass or extend the original -25°C to 85°C range
Frequency characteristics: Q factor and self-resonant frequency within acceptable operational bandwidth

The substitute parts identified below meet the primary substitution criteria. Variations in tolerance, core material, and extended temperature ranges represent design improvements or alternative manufacturing approaches while maintaining functional equivalence within the specified electrical parameters.

Parameter Comparison

Parameter	CTX32T-2R2-R (Main)	1210-222J (API Delevan)	CM322522-2R2JL (Bourns)	CM322522-2R2KL (Bourns)
Manufacturer	Eaton - Electronics Division	API Delevan Inc.	Bourns Inc.	Bourns Inc.
Inductance	2.2 µH	2.2 µH	2.2 µH	2.2 µH
Tolerance	±20%	±5%	±5%	±10%
Current Rating (Amps)	320 mA	431 mA	190 mA	190 mA
DC Resistance (Max)	1 Ohm	1 Ohm	950 mOhm	950 mOhm
Package / Case	1210 (3225 Metric)	1210 (3225 Metric)	Nonstandard	Nonstandard
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-25°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Q @ Frequency	30 @ 7.96 MHz	30 @ 7.9 MHz	30 @ 7.96 MHz	30 @ 7.96 MHz
Self Resonant Frequency	75 MHz	70 MHz	80 MHz	80 MHz
Product Status	Obsolete	Active	Active	Active
Core Material	Ceramic	Ferrite	Ferrite	Ferrite
Type	Drum Core, Wirewound	-	Drum Core, Wirewound	Drum Core, Wirewound

Engineering Selection Recommendations

1210-222J (API Delevan Inc.)

This part is classified as active product status and provides superior current handling capability at 431 mA, exceeding the original 320 mA rating. The inductance value, package format, and unshielded configuration match the CTX32T-2R2-R specification. The extended operating temperature range of -55°C to 125°C provides thermal margin beyond the original -25°C to 85°C specification. Tighter tolerance of ±5% compared to the original ±20% improves circuit performance predictability. This substitute is suitable for applications where the original current rating is adequate and extended temperature operation is beneficial.

CM322522-2R2JL (Bourns Inc.)

This part carries active product status and ROHS3 compliance certification. The inductance and frequency characteristics align with the original specification. However, the current rating of 190 mA is below the original 320 mA specification, making this substitute suitable only for applications where circuit current demands do not exceed 190 mA. The DC resistance of 950 mOhm is lower than the original 1 Ohm maximum, providing improved efficiency. The nonstandard package designation requires physical verification for PCB footprint compatibility despite the 1210 metric dimensions.

CM322522-2R2KL (Bourns Inc.)

This part is classified as active product status with ROHS3 compliance. Electrical parameters are identical to the CM322522-2R2JL variant, with the primary difference being tolerance specification at ±10% versus ±5%. The current rating limitation of 190 mA applies equally to this variant. The nonstandard package designation requires footprint compatibility assessment. Higher inventory availability (9069 pieces) compared to other substitutes may provide supply chain advantages.

Frequently Asked Questions (FAQ)

Q: Can the 1210-222J replace the CTX32T-2R2-R in all applications?

A: The 1210-222J meets the primary substitution criteria of 2.2 µH inductance, 1210 package format, and unshielded configuration. The 431 mA current rating exceeds the original 320 mA specification, providing design margin. Compatibility depends on circuit-specific requirements for tolerance, temperature range, and core material characteristics. The ferrite core material differs from the original ceramic core, which may affect high-frequency performance in specific applications.

Q: Why do the Bourns CM322522 variants show lower current ratings than the original part?

A: The CM322522-2R2JL and CM322522-2R2KL are rated for 190 mA maximum current, which is below the original 320 mA specification. These parts are suitable only for circuits where the actual operating current does not exceed 190 mA. Applications requiring the full 320 mA capability must use the 1210-222J or verify that circuit current demands are within the 190 mA limit.

Q: What does "Nonstandard" package designation mean for the Bourns parts?

A: The CM322522 series carries a "Nonstandard" package designation despite conforming to 1210 (3225 Metric) physical dimensions. This designation indicates the part does not conform to a recognized industry standard package outline. Physical verification of PCB footprint compatibility is required before design implementation, as dimensional variations may exist outside standard tolerance ranges.

Q: Are there compliance or regulatory differences between these substitutes?

A: The 1210-222J is classified as RoHS non-compliant. Both Bourns CM322522 variants carry ROHS3 compliance certification and REACH Unaffected status. Applications subject to RoHS or REACH regulatory requirements must use the Bourns alternatives. The original CTX32T-2R2-R carries no RoHS compliance designation.

Q: How do tolerance differences affect circuit performance?

A: The original CTX32T-2R2-R specifies ±20% tolerance, while the 1210-222J offers ±5% tolerance and the CM322522-2R2JL offers ±5% tolerance. Tighter tolerance improves inductance value predictability and reduces circuit performance variation across production batches. Applications with critical frequency response or impedance matching requirements benefit from the tighter tolerance specifications of the substitute parts.

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

A: The original CTX32T-2R2-R uses ceramic core material, while all substitute parts use ferrite core material. Core material affects frequency response, temperature coefficient, and high-frequency performance characteristics. Ferrite cores typically provide better high-frequency performance but may exhibit different temperature stability. Circuit-specific frequency response requirements determine whether core material substitution is acceptable.

Q: Can I use the CM322522 variants in applications requiring 320 mA current?

A: No. The CM322522-2R2JL and CM322522-2R2KL are rated for maximum 190 mA continuous current. Using these parts in applications requiring 320 mA operation will cause inductor saturation, excessive heating, and potential component failure. The 1210-222J at 431 mA rating is the appropriate substitute for applications requiring the full 320 mA capability.

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