CTX32T-R22-R Equivalent & Substitute Parts

Part Overview

The CTX32T-R22-R is a 220 nH unshielded drum core wirewound inductor manufactured by Eaton Electronics Division, rated for 450 mA with a maximum DC resistance of 320 mOhm in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The part operates across a temperature range of -25°C to 85°C and demonstrates a self-resonant frequency of 350 MHz with a quality factor of 30 at 25.2 MHz.

Key Parameters

Parameter	Value
Inductance	220 nH
Current Rating	450 mA
DC Resistance (DCR)	320 mOhm Max
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature	-25°C ~ 85°C
Tolerance	±20%
Q @ Frequency	30 @ 25.2 MHz
Self-Resonant Frequency	350 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the CTX32T-R22-R is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 220 nH (exact match required)
Current rating: minimum 450 mA
DC resistance: maximum 320 mOhm
Package: 1210 (3225 Metric) surface mount
Shielding: unshielded configuration
Operating temperature range: must encompass or exceed -25°C to 85°C

Secondary Compatibility Factors:

Tolerance specification (±20% or tighter acceptable)
Quality factor at 25.2 MHz (30 or higher acceptable)
Self-resonant frequency (350 MHz or higher acceptable)
Moisture sensitivity level (MSL 1 or MSL 3 acceptable for most applications)

Substitute parts are grouped based on core material composition (ceramic, ferrite, or iron powder) and construction type (drum core wirewound or molded), as these factors influence frequency response and thermal characteristics while maintaining electrical equivalence within the specified parameter envelope.

Parameter Comparison

Part Number	Manufacturer	Inductance (nH)	Current Rating (mA)	DCR Max (mOhm)	Core Material	Type	Tolerance	Temp Range (°C)	Product Status	RoHS Status
CTX32T-R22-R	Eaton	220	450	320	Ceramic	Drum Core, Wirewound	±20%	-25 ~ 85	Obsolete	Not specified
1210-221K	API Delevan Inc.	220	805	320	Iron	Not specified	±10%	-55 ~ 125	Active	Non-compliant
744764002	Würth Elektronik	220	450	320	Ferrite	Drum Core, Wirewound	±10%	-40 ~ 105	Active	ROHS3 Compliant
AISM-1210-R22M-T	Abracon LLC	220	450	320	Ferrite	Molded	±20%	-40 ~ 85	Active	ROHS3 Compliant
CM322522-R22KL	Bourns Inc.	220	360	290	Ferrite	Drum Core, Wirewound	±10%	-40 ~ 125	Active	ROHS3 Compliant
CM322522-R22ML	Bourns Inc.	220	360	290	Ferrite	Drum Core, Wirewound	±20%	-40 ~ 125	Active	ROHS3 Compliant
CMH322522-R22ML	Bourns Inc.	220	450	320	Ferrite	Drum Core, Wirewound	±20%	-55 ~ 125	Active	ROHS3 Compliant
IMC1210EBR22M	Vishay Dale	220	484	320	Iron Powder	Drum Core, Wirewound	±20%	-55 ~ 125	Active	ROHS3 Compliant
IMC1210ERR22M	Vishay Dale	220	484	320	Iron Powder	Drum Core, Wirewound	±20%	-55 ~ 125	Active	ROHS3 Compliant
NLV32T-R22J-PF	TDK Corporation	220	450	320	Ferrite	Drum Core, Wirewound	±5%	-40 ~ 105	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Electrical & Mechanical Equivalents (Recommended for New Designs):

The following parts satisfy all primary substitution criteria with active product status and full RoHS3 compliance:

744764002 (Würth Elektronik): Matches all electrical parameters (220 nH, 450 mA, 320 mOhm) with ferrite core construction. Tighter tolerance (±10%) and extended temperature range (-40°C to 105°C). Active status with 2373 units in stock.
AISM-1210-R22M-T (Abracon LLC): Identical electrical specifications with molded ferrite construction. Maintains ±20% tolerance matching the original. Active status with highest inventory (8870 units). Temperature range -40°C to 85°C covers the original operating window.
CMH322522-R22ML (Bourns Inc.): Meets all electrical requirements with shielded drum core construction. Provides extended temperature range (-55°C to 125°C) and active product status. 728 units available.

Tier 2 - Electrical Equivalents with Parameter Variations (Conditional Use):

IMC1210EBR22M and IMC1210ERR22M (Vishay Dale): Both provide superior current rating (484 mA vs. 450 mA) with identical DCR and inductance. Iron powder core construction. Active status with RoHS3 compliance. IMC1210ERR22M available in tape & reel packaging (1001 units).
1210-221K (API Delevan Inc.): Exceeds current rating specification (805 mA) with matching DCR and inductance. Iron core material. Extended temperature range (-55°C to 125°C). Note: RoHS non-compliant status requires compliance verification for target application.

Tier 3 - Partial Parameter Matches (Limited Substitution):

CM322522-R22KL and CM322522-R22ML (Bourns Inc.): Current rating reduced to 360 mA (below 450 mA requirement) and DCR reduced to 290 mOhm. Suitable only for applications with lower current demands. Both active with RoHS3 compliance.

Obsolete or Restricted Status:

NLV32T-R22J-PF (TDK Corporation): Classified as "Not For New Designs" despite meeting electrical specifications. Suitable only for legacy system maintenance or repair applications. REACH affected status requires regulatory verification.

Frequently Asked Questions (FAQ)

Q1: Can I substitute CTX32T-R22-R with 1210-221K from API Delevan?

A: Electrical substitution is feasible. The 1210-221K provides 220 nH inductance with 320 mOhm DCR matching the original. However, the higher current rating (805 mA vs. 450 mA) and iron core material alter frequency response characteristics. RoHS non-compliance status requires verification against your application's regulatory requirements. The extended temperature range (-55°C to 125°C) exceeds the original specification.

Q2: What is the difference between drum core wirewound and molded inductor types?

A: Drum core wirewound inductors (CTX32T-R22-R, 744764002, IMC1210EBR22M) feature wire wound around a cylindrical core, providing precise inductance control and lower DCR. Molded inductors (AISM-1210-R22M-T) encapsulate the core in a molded compound, offering improved mechanical robustness and moisture resistance. Both achieve identical electrical specifications for this 220 nH application.

Q3: Does shielding affect substitution compatibility?

A: Shielding is a distinct parameter. The original CTX32T-R22-R is unshielded. The CMH322522-R22ML is shielded, reducing electromagnetic interference but increasing component height (2.40 mm vs. 2.20 mm). Shielded variants are not direct mechanical substitutes due to dimensional differences and may require PCB layout modifications.

Q4: Which substitute offers the best inventory availability?

A: AISM-1210-R22M-T (Abracon LLC) provides the highest inventory level at 8870 units in stock. This part matches all electrical specifications and maintains active product status with RoHS3 compliance.

Q5: Are there packaging format differences between substitutes?

A: Yes. CTX32T-R22-R is supplied in bulk packaging. Alternatives include cut tape (1210-221K), tape & reel (744764002, AISM-1210-R22M-T, Bourns variants, IMC1210ERR22M, NLV32T-R22J-PF), and bulk (IMC1210EBR22M). Tape & reel packaging is standard for high-volume production; bulk packaging suits lower-volume applications.

Q6: What is the significance of tolerance specifications (±20% vs. ±10%)?

A: Tolerance defines the acceptable inductance variation from the nominal 220 nH value. ±20% allows 176–264 nH; ±10% allows 198–242 nH. Tighter tolerance (±10%) provides more predictable circuit performance. Applications requiring precise inductance matching should prioritize 744764002 (±10%) or NLV32T-R22J-PF (±5%).

Q7: Can I use NLV32T-R22J-PF as a substitute despite "Not For New Designs" status?

A: This classification restricts use in new product development. The part remains suitable for legacy system maintenance, repair, and field replacement where the original part is specified. New designs should select from active status alternatives: 744764002, AISM-1210-R22M-T, or Bourns/Vishay variants.

Q8: How do core materials (ceramic, ferrite, iron, iron powder) affect performance?

A: Core material influences frequency response, temperature stability, and saturation characteristics. Ceramic (original) and ferrite cores provide stable performance across the specified frequency range. Iron and iron powder cores offer higher current capacity but may exhibit different temperature coefficients. All materials achieve the specified 220 nH inductance and 320 mOhm DCR within tolerance.

Q9: What does MSL (Moisture Sensitivity Level) mean for component handling?

A: MSL indicates moisture absorption risk during storage and assembly. MSL 1 (unlimited shelf life) requires no special handling. MSL 3 (168-hour limit) requires controlled humidity storage and baking before reflow soldering. The original CTX32T-R22-R specifies MSL 1; most active substitutes also specify MSL 1, simplifying supply chain management.

Q10: Which substitute is best for high-temperature applications?

A: For extended temperature operation, select from parts with -55°C to 125°C range: 1210-221K, CM322522-R22KL, CM322522-R22ML, CMH322522-R22ML, IMC1210EBR22M, or IMC1210ERR22M. The original CTX32T-R22-R operates only to 85°C. CMH322522-R22ML combines this extended range with shielded construction and RoHS3 compliance.

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