CTX32T-R82-R Equivalent & Substitute Parts

Part Overview

The CTX32T-R82-R is an 820 nH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 450 mA continuous current with a maximum DC resistance of 650 mOhm and operates across the temperature range of -25°C to 85°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines to ensure design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Inductance	820 nH
Inductance Tolerance	±20%
Current Rating	450 mA
DC Resistance (Max)	650 mOhm
Package / Case	1210 (3225 Metric)
Shielding	Unshielded
Core Material	Ceramic
Q @ Frequency	30 @ 25.2 MHz
Self Resonant Frequency	140 MHz
Operating Temperature Range	-25°C to 85°C
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CTX32T-R82-R is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 820 nH (exact match required)
Package / Case: 1210 (3225 Metric) surface mount form factor
Current Rating: minimum 450 mA
DC Resistance: maximum 650 mOhm
Shielding configuration: Unshielded (as specified)

Secondary Compatibility Factors:

Operating temperature range must encompass or exceed -25°C to 85°C
Moisture Sensitivity Level: 1 (Unlimited)
Self Resonant Frequency: 140 MHz or higher
Q factor at test frequency: 30 or higher

Substitute parts are grouped into two categories based on these parameters:

Category A - Direct Functional Equivalents (Unshielded, Iron/Iron Powder Core): Parts meeting all primary criteria with active product status and enhanced current ratings or improved temperature ranges.

Category B - Functional Equivalents with Design Considerations (Ferrite Core, Lower Current Rating): Parts meeting inductance, package, and DC resistance specifications but with reduced current ratings, requiring circuit-level verification.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR Max (mOhm)	Core Material	Shielding	Package	Temp Range	Status
CTX32T-R82-R	Eaton	820 nH	±20%	450	650	Ceramic	Unshielded	1210	-25 to 85°C	Obsolete
1210-821K	API Delevan	820 nH	±10%	556	670	Iron	Unshielded	1210	-55 to 125°C	Active
1210R-821K	API Delevan	820 nH	±10%	556	670	Iron	Unshielded	1210	-55 to 125°C	Active
CM322522-R82KL	Bourns	820 nH	±10%	245	610	Ferrite	Unshielded	Nonstandard	-40 to 125°C	Active
CM322522-R82ML	Bourns	820 nH	±20%	245	610	Ferrite	Unshielded	Nonstandard	-40 to 125°C	Active
CMH322522-R82ML	Bourns	820 nH	±20%	450	650	Ferrite	Shielded	1210	-55 to 125°C	Active
IMC1210EBR82M	Vishay Dale	820 nH	±20%	450	670	Iron Powder	Unshielded	1210	-55 to 125°C	Active
IMC1210ERR82M	Vishay Dale	820 nH	±20%	450	670	Iron Powder	Unshielded	1210	-55 to 125°C	Active

Engineering Selection Recommendations

Recommended Primary Substitutes:

The IMC1210ERR82M (Vishay Dale) and IMC1210EBR82M (Vishay Dale) are the preferred direct replacements for the CTX32T-R82-R. Both parts match the critical electrical parameters (820 nH inductance, 450 mA current rating, 670 mOhm maximum DCR) and maintain the 1210 package form factor. These components feature iron powder core construction, ROHS3 compliance, and extended operating temperature range (-55°C to 125°C), providing superior environmental performance compared to the obsolete original. The IMC1210ERR82M is supplied in Tape & Reel packaging, while IMC1210EBR82M is supplied in Bulk format.

Secondary Substitutes with Enhanced Current Rating:

The 1210R-821K (API Delevan) offers improved current handling capability at 556 mA with tighter inductance tolerance (±10%) and extended temperature range (-55°C to 125°C). This part is ROHS3 compliant and available in active production with 3000 pieces in stock. The iron core construction and higher current rating provide design margin for applications approaching the 450 mA specification limit. The 1210-821K variant provides identical electrical performance with alternative packaging (Tape & Reel).

Alternative with Shielding Consideration:

The CMH322522-R82ML (Bourns) provides an unshielded-to-shielded transition option. This part maintains the 450 mA current rating and 650 mOhm DCR specification with ferrite core construction. Shielding introduces electromagnetic isolation beneficial for noise-sensitive applications but increases component height to 2.40 mm (versus 2.20 mm original). This substitution requires mechanical clearance verification in the PCB layout.

Not Recommended for Direct Substitution:

The CM322522-R82KL and CM322522-R82ML (Bourns) exhibit reduced current rating (245 mA), which falls below the 450 mA requirement of the original specification. These parts are suitable only for applications where circuit redesign permits lower current operation.

Frequently Asked Questions (FAQ)

Q1: Can the 1210R-821K directly replace the CTX32T-R82-R without circuit modification?

A: Yes. The 1210R-821K meets all primary electrical specifications: 820 nH inductance, 556 mA current rating (exceeds 450 mA requirement), 670 mOhm maximum DCR, and 1210 package form factor. The enhanced current rating and extended temperature range (-55°C to 125°C) provide additional design margin. No circuit modification is required.

Q2: What is the difference between IMC1210ERR82M and IMC1210EBR82M?

A: Both parts are electrically and mechanically identical. The primary difference is packaging: IMC1210ERR82M is supplied in Tape & Reel format suitable for automated assembly, while IMC1210EBR82M is supplied in Bulk format. Select based on assembly process requirements.

Q3: Why do the Bourns CM322522 parts show lower current ratings?

A: The CM322522 series uses ferrite core material with different saturation characteristics compared to the ceramic core of the original CTX32T-R82-R. The 245 mA current rating reflects the saturation limit of the ferrite core at the specified inductance value. These parts are not suitable for 450 mA operation without circuit redesign.

Q4: Is the CMH322522-R82ML shielded variant compatible with the unshielded original?

A: Electrically, yes. The CMH322522-R82ML maintains the 450 mA current rating and 650 mOhm DCR. However, shielding introduces physical differences: increased height (2.40 mm versus 2.20 mm) and ferrite core material. Mechanical clearance must be verified. Shielding is beneficial for EMI-sensitive circuits but unnecessary if the original design did not require it.

Q5: What compliance certifications should I verify for the substitute part?

A: All recommended active substitutes carry ROHS3 compliance and REACH Unaffected status. Moisture Sensitivity Level is 1 (Unlimited) across all alternatives, matching the original specification. Verify ECCN classification (all listed parts are EAR99) against your export requirements.

Q6: Can I use the 1210-821K instead of 1210R-821K?

A: Yes. Both parts are electrically identical with 820 nH inductance, 556 mA current rating, and 670 mOhm DCR. The difference is packaging: 1210-821K uses Tape & Reel format. Select based on assembly process compatibility.

Q7: What is the impact of core material differences (ceramic vs. iron vs. ferrite)?

A: Core material affects frequency response, Q factor, and saturation characteristics. The original ceramic core provides specific frequency performance (Q=30 @ 25.2 MHz, SRF=140 MHz). Iron and iron powder cores (API Delevan, Vishay Dale) maintain equivalent Q and SRF values. Ferrite cores (Bourns) exhibit lower Q (25 @ 25.2 MHz) and reduced SRF (125 MHz), suitable only for lower-frequency applications.

Q8: Are there any RoHS compliance differences between substitutes?

A: The API Delevan 1210-821K is RoHS non-compliant. All other active substitutes (1210R-821K, Bourns CM322522 series, Vishay Dale IMC1210 series) are ROHS3 compliant. Select ROHS3 compliant parts for applications requiring environmental compliance.

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