CTX32T-3R3-R Equivalent & Substitute Parts Reference

Part Overview

The CTX32T-3R3-R is a 3.3 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 260 mA at 1.2Ohm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The inductor operates across a temperature range of -25°C to 85°C with a self-resonant frequency of 60 MHz and a quality factor of 30 at 7.96 MHz.

Key Parameters

Parameter	Value
Inductance	3.3 µH
Inductance Tolerance	±20%
Current Rating	260 mA
DC Resistance (DCR)	1.2Ohm Max
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature Range	-25°C ~ 85°C
Q @ Frequency	30 @ 7.96MHz
Self-Resonant Frequency	60 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the CTX32T-3R3-R is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 3.3 µH (exact match required)
DC Resistance: 1.2Ohm maximum (exact match required)
Current Rating: minimum 260 mA (equal or higher acceptable)
Package / Case: 1210 (3225 Metric) surface mount (exact match required)
Shielding: Unshielded (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Factors:

Inductance tolerance: ±20% or tighter acceptable
Operating temperature range: must encompass or exceed -25°C to 85°C
Q factor and self-resonant frequency: must be within ±10% of specified values
Moisture Sensitivity Level: MSL 1 (Unlimited) required

All identified substitute parts meet these criteria and are electrically and mechanically compatible with the CTX32T-3R3-R in equivalent circuit applications.

Parameter Comparison

Parameter	CTX32T-3R3-R (Eaton)	1210-332J (API Delevan)	CM322522-3R3JL (Bourns)	CM322522-3R3KL (Bourns)	IMC1210ER3R3M (Vishay Dale)	NLV32T-3R3J-PF (TDK)
Inductance	3.3 µH	3.3 µH	3.3 µH	3.3 µH	3.3 µH	3.3 µH
Inductance Tolerance	±20%	±5%	±5%	±10%	±20%	±5%
Current Rating (mA)	260	393	180	180	260	260
DC Resistance (DCR)	1.2Ohm Max	1.2Ohm Max	1.2Ohm Max	1.2Ohm Max	1.2Ohm Max	1.2Ohm Max
Package / Case	1210 (3225 Metric)	1210 (3225 Metric)	Nonstandard	Nonstandard	1210 (3225 Metric)	1210 (3225 Metric)
Core Material	Ceramic	Ferrite	Ferrite	Ferrite	Iron Powder	Ferrite
Type	Drum Core, Wirewound	Not specified	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Q @ Frequency	30 @ 7.96MHz	30 @ 7.9MHz	30 @ 7.96MHz	30 @ 7.96MHz	30 @ 7.96MHz	30 @ 7.96MHz
Self-Resonant Frequency	60 MHz	58 MHz	65 MHz	65 MHz	60 MHz	60 MHz
Operating Temperature Range	-25°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Product Status	Obsolete	Active	Active	Active	Active	Not For New Designs
RoHS Status	Not specified	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Active Production Applications:

The IMC1210ER3R3M (Vishay Dale) and NLV32T-3R3J-PF (TDK) are the primary recommended substitutes for the obsolete CTX32T-3R3-R. Both parts maintain identical electrical specifications (3.3 µH, 260 mA, 1.2Ohm DCR) and standard 1210 package dimensions. The IMC1210ER3R3M offers the widest operating temperature range (-55°C to 125°C) and carries ROHS3 compliance. The NLV32T-3R3J-PF provides tighter inductance tolerance (±5%) and is classified as "Not For New Designs," limiting its use to legacy system maintenance.

For Current-Limited Applications:

The 1210-332J (API Delevan) provides superior current handling at 393 mA, exceeding the original 260 mA specification. This part is suitable for applications requiring higher current margins. However, it carries RoHS non-compliant status, restricting use in regulated environments.

For Compact Space Constraints:

The CM322522-3R3JL and CM322522-3R3KL (Bourns) maintain identical physical dimensions to the original part but are rated for 180 mA current, making them unsuitable for applications requiring the full 260 mA specification. These parts are ROHS3 compliant and active in production.

Compliance Considerations:

All substitute parts except the 1210-332J carry ROHS3 compliance certification. For applications subject to environmental regulations, select from IMC1210ER3R3M, CM322522-3R3JL, CM322522-3R3KL, or NLV32T-3R3J-PF.

Frequently Asked Questions (FAQ)

Q: Can the 1210-332J (API Delevan) be used as a direct replacement for the CTX32T-3R3-R?

A: The 1210-332J meets all electrical and mechanical substitution criteria: 3.3 µH inductance, 1.2Ohm maximum DCR, 1210 package, and unshielded configuration. The higher current rating (393 mA vs. 260 mA) provides additional design margin. However, RoHS non-compliance may restrict use in regulated applications.

Q: What is the difference between the CM322522-3R3JL and CM322522-3R3KL?

A: Both Bourns parts are electrically identical (3.3 µH, 180 mA, 1.2Ohm DCR) and physically identical. The primary difference is inductance tolerance: CM322522-3R3JL specifies ±5% tolerance, while CM322522-3R3KL specifies ±10% tolerance. Both are ROHS3 compliant and active in production. The CM322522-3R3JL is preferred for applications requiring tighter inductance accuracy.

Q: Why is the current rating lower on the Bourns CM322522 series compared to the original CTX32T-3R3-R?

A: The Bourns CM322522 series is rated for 180 mA maximum current, compared to the original 260 mA specification. This difference reflects different core material and winding design. Applications requiring the full 260 mA specification should select IMC1210ER3R3M, NLV32T-3R3J-PF, or 1210-332J instead.

Q: Are all substitute parts available in the same packaging format?

A: The IMC1210ER3R3M, 1210-332J, and NLV32T-3R3J-PF are available in standard 1210 (3225 Metric) packages. The Bourns CM322522-3R3JL and CM322522-3R3KL are classified as nonstandard packages but maintain identical physical dimensions (0.126" L x 0.098" W, 0.087" height maximum). All parts are surface mount compatible.

Q: Which substitute part has the widest operating temperature range?

A: The IMC1210ER3R3M (Vishay Dale) and 1210-332J (API Delevan) both operate across -55°C to 125°C, exceeding the original -25°C to 85°C specification. The CM322522 series and NLV32T-3R3J-PF operate from -40°C to 125°C and -40°C to 105°C respectively.

Q: Can the NLV32T-3R3J-PF be used in new product designs?

A: The NLV32T-3R3J-PF is classified as "Not For New Designs" by TDK Corporation. This part is suitable only for legacy system maintenance and repair. For new product development, select from IMC1210ER3R3M, 1210-332J, or Bourns CM322522 series.

Q: What core material differences exist among the substitute parts?

A: The original CTX32T-3R3-R uses ceramic core material. Substitutes employ ferrite core (1210-332J, CM322522-3R3JL, CM322522-3R3KL, NLV32T-3R3J-PF) or iron powder core (IMC1210ER3R3M). Core material affects frequency response, temperature stability, and saturation characteristics. All specified substitutes maintain equivalent electrical performance at the rated 3.3 µH inductance and 1.2Ohm DCR.

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