CTX32T-121-R Equivalent & Substitute Parts

Part Overview

The CTX32T-121-R is a 120 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 70 mA continuous current with a maximum DC resistance of 11 Ohm and operates across a temperature range of -25°C to 85°C. The part is packaged in a 1210 (3225 Metric) form factor with ±10% inductance tolerance.

The CTX32T-121-R is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

CTX32T-121-R

Eaton - Electronics DivisionIn Stock: 993CTX32T-121-R Datasheet

Current PartRFQ

CM322522-121JL

Bourns Inc.In Stock: 1117CM322522-121JL Datasheet

SimilarRFQ

CM322522-121KL

Bourns Inc.In Stock: 891CM322522-121KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CTX32T-121-R are identified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 120 µH
• DC resistance: 11 Ohm maximum
• Core type: Drum core, wirewound
• Shielding configuration: Unshielded
• Q factor @ 796 kHz: 20
• Self resonant frequency: 10 MHz
• Physical dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm)
• Height (seated): 0.087" (2.20mm)
• Mounting type: Surface mount
• Moisture sensitivity level: 1 (Unlimited)

Secondary Consideration:

• Current rating: Substitute parts rated at 55 mA are acceptable where the application does not require the full 70 mA rating of the original part

The substitute parts CM322522-121JL and CM322522-121KL, both manufactured by Bourns Inc., meet all primary matching criteria. Both are active products with enhanced operating temperature ranges and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

CM322522-121JL and CM322522-121KL Selection Basis:

Both Bourns CM322522 series inductors are active products with full regulatory compliance. The primary distinction between these two substitutes is inductance tolerance: CM322522-121JL provides ±5% tolerance, while CM322522-121KL provides ±10% tolerance matching the original CTX32T-121-R specification.

Current Rating Consideration:

The substitute parts are rated for 55 mA continuous current, compared to the original 70 mA rating. Selection of these substitutes is appropriate for applications where the circuit current does not exceed 55 mA. For applications requiring the full 70 mA rating, these substitutes are not suitable.

Temperature Range Enhancement:

Both substitute parts operate across -40°C to 125°C, extending the lower and upper temperature limits compared to the original -25°C to 85°C range. This provides improved thermal performance margin in demanding environments.

Regulatory Compliance:

Both substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements. The original CTX32T-121-R does not specify these certifications.

Core Material Difference:

The original part uses a ceramic core material, while the substitutes employ ferrite core material. Both configurations maintain identical electrical performance parameters including inductance, Q factor, and self resonant frequency at the specified test frequency.

Frequently Asked Questions (FAQ)

Q: Can CM322522-121JL or CM322522-121KL be used as direct replacements for CTX32T-121-R?

A: Both Bourns inductors are direct mechanical and electrical substitutes provided the application current does not exceed 55 mA. Physical dimensions, inductance value, DC resistance, and frequency characteristics are identical. The substitutes offer extended operating temperature range and active product status.

Q: What is the difference between CM322522-121JL and CM322522-121KL?

A: The primary difference is inductance tolerance. CM322522-121JL provides ±5% tolerance, while CM322522-121KL provides ±10% tolerance. Both parts are otherwise electrically and mechanically identical. Selection depends on circuit tolerance requirements.

Q: Why is the current rating lower on the substitute parts?

A: The substitute parts are rated for 55 mA continuous current versus the original 70 mA rating. This is a design characteristic of the Bourns CM322522 series. Applications requiring currents above 55 mA cannot use these substitutes.

Q: Are the substitute parts available in the same packaging as the original?

A: Both substitute parts are supplied in Tape & Reel (TR) packaging. The original CTX32T-121-R packaging is not specified in the provided data. Physical form factor and mounting characteristics are identical across all three parts.

Q: What is the significance of the core material change from ceramic to ferrite?

A: Both ceramic and ferrite core materials deliver the specified electrical performance at the test frequency of 796 kHz. The ferrite core material in the substitute parts does not affect inductance value, Q factor, or self resonant frequency within the specified parameters.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both CM322522-121JL and CM322522-121KL are ROHS3 compliant and REACH unaffected. The original CTX32T-121-R compliance status is not specified.

Q: Can these parts be used interchangeably in existing designs?

A: Mechanical and electrical interchangeability is confirmed for applications operating at 55 mA or below. Designs requiring the full 70 mA rating of the original part require alternative solutions. Thermal performance is improved with the extended operating range of the substitute parts.