CTX32T-R47-R Equivalent & Substitute Parts Reference

Part Overview

The CTX32T-R47-R is a 470 nH unshielded drum core wirewound inductor manufactured by Eaton Electronics Division, rated for 450 mA current with 500 mOhm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and design continuity. The part operates across a temperature range of -25°C to 85°C and is designed for high-frequency applications with a self-resonant frequency of 220 MHz.

Key Parameters

Parameter	Value
Inductance	470 nH
Inductance Tolerance	±20%
Current Rating	450 mA
DC Resistance (Max)	500 mOhm
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Q @ Frequency	30 @ 25.2 MHz
Self-Resonant Frequency	220 MHz
Operating Temperature Range	-25°C to 85°C
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CTX32T-R47-R are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Inductance value: 470 nH (exact match required)
Package / Case: 1210 (3225 Metric) surface mount (exact match required)
Current Rating: 450 mA minimum
DC Resistance: 500 mOhm maximum
Shielding configuration: Unshielded (as specified)
Frequency test point: 25.2 MHz

Secondary Compatibility Parameters:

Inductance tolerance: ±20% or tighter acceptable
Q factor: 30 @ 25.2 MHz or equivalent
Self-resonant frequency: 220 MHz or higher acceptable
Moisture Sensitivity Level: 1 (Unlimited) preferred
Operating temperature range: Must encompass application requirements

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching all critical parameters with identical core materials and construction types) and Functional Equivalents (matching all critical electrical parameters with alternative core materials or construction methods that maintain performance within specified tolerances).

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR Max (mOhm)	Core Type	Shielding	Package	Status
CTX32T-R47-R	Eaton	470 nH	±20%	450	500	Ceramic Drum Core	Unshielded	1210	Obsolete
1210-471K	Delevan	470 nH	±10%	644	500	Iron	Unshielded	1210	Active
744764004	Würth Elektronik	470 nH	±20%	450	500	Ferrite Drum Core	Unshielded	1210	Active
AISM-1210-R47M-T	Abracon LLC	470 nH	±20%	450	500	Ferrite Molded	Unshielded	1210	Active
CM322522-R47KL	Bourns Inc.	470 nH	±10%	290	440	Ferrite Drum Core	Unshielded	Nonstandard	Active
CM322522-R47ML	Bourns Inc.	470 nH	±20%	290	440	Ferrite Drum Core	Unshielded	Nonstandard	Active
CMH322522-R47ML	Bourns Inc.	470 nH	±20%	450	500	Ferrite Drum Core	Shielded	1210	Active
IMC1210EBR47M	Vishay Dale	470 nH	±20%	450	500	Iron Powder Drum Core	Unshielded	1210	Active
IMC1210ERR47M	Vishay Dale	470 nH	±20%	450	500	Iron Powder Drum Core	Unshielded	1210	Active
NLV32T-R47J-PF	TDK Corporation	470 nH	±5%	450	500	Ferrite Drum Core	Unshielded	1210	Not For New Designs

Engineering Selection Recommendations

Tier 1 - Direct Electrical Equivalents (Recommended Primary Substitutes):

The following parts provide complete electrical and mechanical compatibility with the CTX32T-R47-R:

744764004 (Würth Elektronik WE-GF Series) - Matches all critical electrical parameters (470 nH, ±20% tolerance, 450 mA, 500 mOhm DCR) in identical 1210 package. Active product status with ROHS3 compliance and REACH unaffected designation. Ferrite drum core construction. Self-resonant frequency of 480 MHz exceeds original specification. Operating temperature range -40°C to 105°C. Highest inventory availability (49,300 pcs).

AISM-1210-R47M-T (Abracon LLC AISM-1210 Series) - Matches all critical electrical parameters in identical 1210 package. Active product status with ROHS3 compliance. Ferrite molded construction. Operating temperature range -40°C to 85°C. Inventory: 6,401 pcs.

IMC1210ERR47M (Vishay Dale IMC-1210 Series, Tape & Reel) - Matches all critical electrical parameters in identical 1210 package with Tape & Reel packaging. Active product status with ROHS3 compliance. Iron powder drum core construction. Operating temperature range -55°C to 125°C. Inventory: 837 pcs.

IMC1210EBR47M (Vishay Dale IMC-1210 Series, Bulk) - Identical electrical specifications to IMC1210ERR47M with bulk packaging option. Active product status. Inventory: 763 pcs.

Tier 2 - Functional Equivalents with Parameter Deviations:

1210-471K (Delevan 1210 Series) - Matches inductance and package with improved tolerance (±10%). Current rating of 644 mA exceeds requirement. Iron core construction. Operating temperature range -55°C to 125°C. RoHS non-compliant status requires compliance verification. Inventory: 1,214 pcs.

NLV32T-R47J-PF (TDK Corporation NLV-PF Series) - Matches all critical electrical parameters with superior tolerance (±5%). Ferrite drum core. Operating temperature range -40°C to 105°C. Product status "Not For New Designs" indicates limited future availability. REACH affected designation requires regulatory review. Inventory: 18,725 pcs.

Tier 3 - Limited Compatibility (Conditional Use Only):

CM322522-R47ML and CM322522-R47KL (Bourns Inc. CM322522 Series) - Both parts reduce current rating to 290 mA (below 450 mA requirement) and DCR to 440 mOhm. Package classified as nonstandard. Suitable only for applications with reduced current requirements. Active product status with ROHS3 compliance.

CMH322522-R47ML (Bourns Inc. CMH322522 Series) - Matches all critical electrical parameters but features shielded construction (original is unshielded). Shielding introduces different electromagnetic behavior. Active product status with ROHS3 compliance. Operating temperature range -55°C to 125°C. Use only when shielding is required or beneficial.

Frequently Asked Questions (FAQ)

Q: Can I use 744764004 as a direct replacement for CTX32T-R47-R?

A: Yes. The 744764004 (Würth Elektronik) provides complete electrical and mechanical compatibility. Both parts specify 470 nH inductance, ±20% tolerance, 450 mA current rating, 500 mOhm maximum DCR, and identical 1210 surface mount package. The 744764004 is active production with superior compliance certifications (ROHS3, REACH unaffected) and higher inventory availability.

Q: What is the difference between drum core and molded inductor construction?

A: Drum core inductors use a cylindrical ferrite or ceramic core with wire wound around it, while molded inductors encapsulate the core and windings in a molded compound. Both construction types in this comparison maintain identical electrical specifications (470 nH, 450 mA, 500 mOhm). Selection depends on application-specific requirements for mechanical robustness, thermal management, or EMI characteristics not specified in the electrical parameters.

Q: Why do some substitutes have lower current ratings?

A: The CM322522 series (290 mA rating) represents a different product line within the same inductance value. These parts are not suitable for applications requiring the full 450 mA rating. Selection must verify that actual circuit current requirements do not exceed the substitute part's current rating.

Q: What does "Not For New Designs" mean for the NLV32T-R47J-PF?

A: This designation indicates the part is in mature/end-of-life phase. While currently available (18,725 pcs inventory), the manufacturer does not recommend this part for new product designs. For new designs, select from Tier 1 recommendations (744764004, AISM-1210-R47M-T, or IMC1210ERR47M).

Q: Can I use CMH322522-R47ML (shielded) instead of the unshielded CTX32T-R47-R?

A: Electrical parameters match completely (470 nH, 450 mA, 500 mOhm). However, shielding introduces different electromagnetic coupling characteristics. Use shielded substitutes only when the application specifically requires shielding or when EMI performance testing confirms compatibility. Unshielded substitutes (744764004, AISM-1210-R47M-T, IMC1210ERR47M) maintain the original unshielded configuration.

Q: What packaging options are available?

A: Most Tier 1 substitutes are available in Tape & Reel (TR) packaging for automated assembly. IMC1210EBR47M offers bulk packaging. Verify packaging compatibility with your assembly process before final selection.

Q: Are all substitutes RoHS compliant?

A: Tier 1 substitutes (744764004, AISM-1210-R47M-T, IMC1210ERR47M, IMC1210EBR47M) are ROHS3 compliant. The Delevan 1210-471K is RoHS non-compliant and requires compliance verification for your application. NLV32T-R47J-PF is ROHS3 compliant but REACH affected.

Q: What is the temperature operating range difference impact?

A: The original CTX32T-R47-R operates -25°C to 85°C. Tier 1 substitutes extend this to -40°C to 105°C (Würth, TDK) or -40°C to 85°C (Abracon), providing broader operating margins. Vishay Dale parts extend to -55°C to 125°C. Verify your application's actual temperature requirements before selecting based on this parameter.

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