CTX32T-680-R Equivalent & Substitute Parts

Part Overview

The CTX32T-680-R is a 68 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 50 mA maximum current with 9 Ohm DC resistance in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing production and design requirements. Substitute parts must maintain electrical performance within the specified inductance, current rating, and DC resistance parameters while accommodating variations in core material, shielding configuration, and operating temperature range.

Key Parameters

Parameter	CTX32T-680-R Value	Criticality for Substitution
Inductance	68 µH	Critical - Must match
Current Rating (Amps)	50 mA	Critical - Minimum requirement
DC Resistance (DCR)	9 Ohm Max	Critical - Must not exceed
Tolerance	±10%	Important - Affects circuit performance
Package / Case	1210 (3225 Metric)	Critical - Physical compatibility
Mounting Type	Surface Mount	Critical - Assembly compatibility
Operating Temperature	-25°C ~ 85°C	Important - Application dependent
Shielding	Unshielded	Important - EMI considerations
Q @ Freq	30 @ 2.52MHz	Reference - Performance indicator
Frequency - Self Resonant	12 MHz	Reference - Frequency response

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Primary Matching Criteria (Non-negotiable):

Inductance: 68 µH (exact match required)
DC Resistance: 9 Ohm maximum (cannot exceed)
Package / Case: 1210 (3225 Metric) surface mount configuration
Mounting Type: Surface mount

Secondary Compatibility Criteria (Application-dependent):

Current Rating: Minimum 50 mA (higher ratings acceptable for drop-in replacement)
Tolerance: ±10% or tighter acceptable
Operating Temperature: Must encompass or exceed -25°C ~ 85°C range
Shielding: Unshielded preferred; shielded variants acceptable with EMI evaluation
Q Factor and Self-Resonant Frequency: Reference parameters for frequency response verification

Substitute Classification:

Direct Substitutes (Electrical and mechanical equivalence with active product status):

CM322522-680JL (Bourns Inc.)
CM322522-680KL (Bourns Inc.)
744764168 (Würth Elektronik)
AISM-1210-680K-T (Abracon LLC)
NLV32T-680J-PF (TDK Corporation)

Similar Substitutes (Meet core electrical requirements with design variations):

1210-683J (API Delevan Inc.) - Higher current rating (144 mA)
CMH322522-680KL (Bourns Inc.) - Shielded variant

Parameter Comparison

Part Number	Manufacturer	Inductance (µH)	Current Rating (mA)	DCR (Ohm Max)	Tolerance	Package	Shielding	Operating Temp (°C)	Product Status
CTX32T-680-R	Eaton	68	50	9	±10%	1210	Unshielded	-25 ~ 85	Obsolete
CM322522-680JL	Bourns Inc.	68	65	9	±5%	Nonstandard	Unshielded	-40 ~ 125	Active
CM322522-680KL	Bourns Inc.	68	65	9	±10%	Nonstandard	Unshielded	-40 ~ 125	Active
744764168	Würth Elektronik	68	50	9	±10%	1210	Unshielded	-40 ~ 105	Active
AISM-1210-680K-T	Abracon LLC	68	50	9	±10%	1210	Unshielded	-40 ~ 85	Active
CMH322522-680KL	Bourns Inc.	68	50	9	±10%	1210	Shielded	-55 ~ 125	Active
NLV32T-680J-PF	TDK Corporation	68	50	9	±5%	1210	Unshielded	-40 ~ 105	Not For New Designs
1210-683J	API Delevan Inc.	68	144	9	±5%	1210	Unshielded	-55 ~ 125	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, Full Compatibility):

744764168 (Würth Elektronik WE-GF Series) is the preferred direct substitute. This part maintains identical electrical specifications (68 µH, 50 mA, 9 Ohm DCR, ±10% tolerance) and 1210 package configuration. The component is ROHS3 compliant, REACH unaffected, and rated for -40°C ~ 105°C operation, exceeding the original temperature range. Ferrite core material and active product status ensure long-term availability and supply chain stability.

AISM-1210-680K-T (Abracon LLC AISM-1210 Series) provides equivalent electrical and mechanical performance with molded inductor construction. Specifications match the original part exactly (68 µH, 50 mA, 9 Ohm DCR, ±10% tolerance, 1210 package). ROHS3 compliance and active status support production continuity. Operating temperature range (-40°C ~ 85°C) encompasses the original specification.

CMH322522-680KL (Bourns Inc. CMH322522 Series - Shielded Variant) is suitable for applications requiring electromagnetic shielding. Electrical parameters remain equivalent (68 µH, 50 mA, 9 Ohm DCR, ±10% tolerance, 1210 package). Extended operating temperature (-55°C ~ 125°C) and ROHS3 compliance support demanding environments. Shielding configuration requires EMI performance evaluation against original unshielded design.

Secondary Substitutes (Higher Current Rating, Active Status):

CM322522-680KL (Bourns Inc. CM322522 Series) offers increased current capacity (65 mA vs. 50 mA) with identical inductance and DCR specifications. Extended operating temperature (-40°C ~ 125°C) and ROHS3 compliance are advantageous. Package designation listed as "Nonstandard" requires physical verification against 1210 (3225 Metric) footprint compatibility before implementation.

1210-683J (API Delevan Inc. 1210 Series) provides significantly higher current rating (144 mA) suitable for applications with future current margin requirements. Electrical specifications (68 µH, 9 Ohm DCR, ±5% tolerance) and 1210 package ensure mechanical compatibility. RoHS non-compliance status may restrict use in regulated applications. Extended operating temperature (-55°C ~ 125°C) supports industrial environments.

Legacy Substitute (Not For New Designs):

NLV32T-680J-PF (TDK Corporation NLV-PF Series) meets all electrical and mechanical requirements with ±5% tolerance and active inventory (41,400 pcs). Product status designation "Not For New Designs" indicates manufacturer discontinuation trajectory. REACH affected status requires compliance verification. This part is suitable only for legacy system maintenance or existing design continuation.

Frequently Asked Questions (FAQ)

Q: Can CM322522-680JL and CM322522-680KL be used interchangeably with CTX32T-680-R?

A: Both Bourns parts maintain the required 68 µH inductance and 9 Ohm DCR specifications. CM322522-680KL matches the ±10% tolerance of the original part. CM322522-680JL offers tighter ±5% tolerance. However, both are listed with "Nonstandard" package designation rather than 1210 (3225 Metric). Physical footprint verification is required before implementation to confirm PCB pad compatibility.

Q: What is the difference between unshielded and shielded variants?

A: The original CTX32T-680-R is unshielded. CMH322522-680KL is the shielded equivalent from Bourns. Shielded inductors reduce electromagnetic interference (EMI) radiation but may exhibit different frequency response characteristics. Shielded variants are appropriate for noise-sensitive applications or high-density PCB layouts. Unshielded variants (744764168, AISM-1210-680K-T, NLV32T-680J-PF) are suitable for general-purpose applications with adequate spacing.

Q: Why do some substitutes have higher current ratings?

A: Higher current ratings (CM322522-680KL at 65 mA, 1210-683J at 144 mA) indicate greater saturation margin and thermal headroom. These parts function as drop-in replacements for the 50 mA rated CTX32T-680-R in applications operating below the original current limit. Higher-rated parts provide design flexibility for future current requirement increases without component redesign.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are ROHS3 compliant (744764168, AISM-1210-680K-T, CM322522-680JL, CM322522-680KL, CMH322522-680KL, NLV32T-680J-PF). The API Delevan 1210-683J is RoHS non-compliant and restricted in regulated markets. Compliance verification is mandatory for applications subject to RoHS directives.

Q: What is the significance of "Not For New Designs" status?

A: NLV32T-680J-PF carries this designation from TDK, indicating the manufacturer is transitioning away from this product line. While currently available with substantial inventory (41,400 pcs), long-term supply cannot be guaranteed. This part is appropriate only for legacy system support or existing design continuation, not for new product development.

Q: How do operating temperature ranges affect substitution?

A: The original CTX32T-680-R operates -25°C ~ 85°C. All recommended substitutes exceed this range: 744764168 (-40°C ~ 105°C), AISM-1210-680K-T (-40°C ~ 85°C), CMH322522-680KL (-55°C ~ 125°C). Extended temperature ranges provide margin for industrial or automotive applications. Applications limited to the original temperature window can use any substitute without thermal derating.

Q: Can tolerance differences affect circuit performance?

A: The original part specifies ±10% tolerance. Substitutes with ±5% tolerance (CM322522-680JL, NLV32T-680J-PF, 1210-683J) provide tighter inductance control, beneficial for frequency-critical or resonant circuits. Applications with ±10% tolerance acceptance can use either specification. Tighter tolerance parts are preferred for precision filter or impedance matching applications.

Q: What packaging considerations apply to the Bourns CM322522 series?

A: CM322522-680JL and CM322522-680KL are listed with "Nonstandard" package designation, contrasting with the standard 1210 (3225 Metric) specification of the original part. Physical dimensions are identical (0.126" L x 0.098" W, 3.20mm x 2.50mm), but PCB footprint compatibility must be verified with the component supplier or through sample evaluation before production implementation.

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