CTX32T-220-R Equivalent & Substitute Parts

Part Overview

The CTX32T-220-R is a 22 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 110 mA maximum current with 3.7 Ohm DC resistance 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 is suitable for applications requiring fixed inductance values in compact SMD form factors.

Key Parameters

Parameter	Value
Inductance	22 µH
Inductance Tolerance	±10%
Current Rating	110 mA
DC Resistance (DCR)	3.7 Ohm Max
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature	-25°C ~ 85°C
Q @ Frequency	30 @ 2.52 MHz
Self Resonant Frequency	25 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the CTX32T-220-R is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 22 µH (exact match required)
DC Resistance: 3.7 Ohm Max (exact match required)
Package / Case: 1210 (3225 Metric) or equivalent physical dimensions
Mounting Type: Surface Mount (SMD)
Q @ Frequency: 30 @ 2.52 MHz (electrical performance indicator)

Secondary Compatibility Factors:

Current Rating: Minimum 110 mA (equal or higher acceptable)
Inductance Tolerance: ±10% or tighter acceptable
Shielding: Unshielded preferred; shielded variants acceptable with application review
Operating Temperature: Must encompass or exceed -25°C ~ 85°C range

Substitute parts are grouped into two categories: Direct Substitutes (identical electrical and mechanical specifications) and Similar Substitutes (compatible with noted parameter variations).

Parameter Comparison

Parameter	CTX32T-220-R (Main)	CM322522-220JL	CM322522-220KL	1210-223J	AISM-1210-220K-T	CMH322522-220KL
Manufacturer	Eaton	Bourns Inc.	Bourns Inc.	Delevan	Abracon LLC	Bourns Inc.
Inductance	22 µH	22 µH	22 µH	22 µH	22 µH	22 µH
Inductance Tolerance	±10%	±5%	±10%	±5%	±10%	±10%
Current Rating (mA)	110	105	105	224	110	110
DC Resistance (Ohm Max)	3.7	3.7	3.7	3.7	3.7	3.7
Package / Case	1210 (3225 Metric)	Nonstandard	Nonstandard	1210 (3225 Metric)	1210 (3225 Metric)	1210 (3225 Metric)
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Shielded
Q @ Frequency	30 @ 2.52 MHz	30 @ 2.52 MHz	30 @ 2.52 MHz	30 @ 2.5 MHz	30 @ 2.52 MHz	30 @ 2.52 MHz
Self Resonant Frequency (MHz)	25	25	25	20	20	19
Operating Temperature	-25°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

CM322522-220KL (Bourns Inc.) and AISM-1210-220K-T (Abracon LLC) are the primary recommended substitutes. Both parts match the CTX32T-220-R in inductance (22 µH), current rating (110 mA), DC resistance (3.7 Ohm Max), and inductance tolerance (±10%). Both are active products with ROHS3 compliance and extended operating temperature ranges (-40°C ~ 85°C minimum), exceeding the original specification. CM322522-220KL provides the widest temperature range (-40°C ~ 125°C) and is available in higher inventory quantities (12,488 pcs).

Compatible Alternatives (Application-Dependent):

CM322522-220JL (Bourns Inc.) offers tighter inductance tolerance (±5%) but has a slightly lower current rating (105 mA versus 110 mA). This part is suitable for applications where the 5 mA current margin is acceptable and tighter inductance tolerance is beneficial. ROHS3 compliance and extended temperature range (-40°C ~ 125°C) are provided.

1210-223J (Delevan) provides significantly higher current capacity (224 mA) with matching inductance and DC resistance specifications. This part is suitable for applications requiring additional current headroom. However, RoHS non-compliance status must be evaluated against procurement requirements. Self-resonant frequency is reduced to 20 MHz.

Shielded Alternative:

CMH322522-220KL (Bourns Inc.) is a shielded variant matching all electrical specifications of the CTX32T-220-R. This part is recommended only for applications where electromagnetic shielding is required, as the original CTX32T-220-R is unshielded. ROHS3 compliance and extended temperature range (-55°C ~ 125°C) are provided.

Inventory and Availability:

All substitute parts are currently in active production with substantial inventory availability. CM322522-220KL offers the highest stock level (12,488 pcs), followed by CMH322522-220KL (8,650 pcs).

Frequently Asked Questions (FAQ)

Q1: Can CM322522-220JL replace CTX32T-220-R in all applications?

CM322522-220JL matches the inductance, DC resistance, and tolerance specifications of the CTX32T-220-R. However, the current rating is 105 mA versus 110 mA. This 5 mA difference is acceptable for applications where the circuit operates below 105 mA. For circuits requiring the full 110 mA rating, AISM-1210-220K-T or CM322522-220KL are preferred.

Q2: What is the difference between the Bourns CM322522 series parts?

CM322522-220JL and CM322522-220KL are both Bourns unshielded drum core wirewound inductors with identical inductance (22 µH), DC resistance (3.7 Ohm Max), and current rating (105 mA). The primary difference is inductance tolerance: CM322522-220JL is ±5% while CM322522-220KL is ±10%. Both have identical electrical performance (Q @ 2.52 MHz = 30) and operating temperature range (-40°C ~ 125°C).

Q3: Why is CMH322522-220KL listed as a similar substitute rather than a direct substitute?

CMH322522-220KL is a shielded variant, whereas the CTX32T-220-R is unshielded. Shielding introduces electromagnetic isolation that may alter circuit behavior in sensitive applications. The shielded variant is suitable only when electromagnetic shielding is required by the application design. All other electrical parameters match the original part.

Q4: Is 1210-223J compatible with the CTX32T-220-R?

1210-223J matches the inductance (22 µH), DC resistance (3.7 Ohm Max), and package dimensions (1210 / 3225 Metric) of the CTX32T-220-R. The current rating is significantly higher (224 mA versus 110 mA), making it suitable for applications requiring additional current capacity. However, RoHS non-compliance status must be evaluated against procurement and regulatory requirements. Self-resonant frequency is 20 MHz versus 25 MHz for the original part.

Q5: What are the package compatibility considerations?

The CTX32T-220-R uses a standard 1210 (3225 Metric) package. AISM-1210-220K-T, 1210-223J, and CMH322522-220KL all use the same 1210 (3225 Metric) package with identical footprints. CM322522-220JL and CM322522-220KL are listed as nonstandard packages but maintain identical physical dimensions (0.126" L x 0.098" W / 3.20mm x 2.50mm) and height (0.087" / 2.20mm), ensuring PCB compatibility.

Q6: Which substitute offers the best compliance profile?

CM322522-220KL, AISM-1210-220K-T, and CMH322522-220KL all carry ROHS3 compliance certification. CM322522-220JL also provides ROHS3 compliance. 1210-223J is RoHS non-compliant. For applications requiring RoHS compliance, any of the first four options are suitable.

Q7: What is the temperature range consideration for substitute selection?

The CTX32T-220-R operates from -25°C to 85°C. All substitute parts exceed this range: CM322522-220JL and CM322522-220KL operate -40°C ~ 125°C; AISM-1210-220K-T operates -40°C ~ 85°C; 1210-223J operates -55°C ~ 125°C; CMH322522-220KL operates -55°C ~ 125°C. All substitutes are suitable for the original operating temperature range with extended capability.

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