CLF7045T-331M Equivalent & Substitute Parts

Part Overview

The CLF7045T-331M is a 330 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 420 mA continuous current with a maximum DC resistance of 1.236 Ohm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The part operates across the temperature range of -40°C to 105°C and is designed for surface mount applications in nonstandard packaging configurations.

Substiute Parts

CLF7045T-331M

TDK CorporationIn Stock: 954CLF7045T-331M Datasheet

Current PartRFQ

DR73-331-R

Eaton - Electronics DivisionIn Stock: 3866DR73-331-R Datasheet

MFR RecommendedRFQ

DR74-331-R

Eaton - Electronics DivisionIn Stock: 2299DR74-331-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CLF7045T-331M is determined by the following critical parameters:

• Inductance Value: 330 µH (exact match required)
• Inductance Tolerance: ±20% (must match or be tighter)
• Current Rating: Minimum 420 mA (equal or higher acceptable)
• Core Type: Ferrite drum core, wirewound (must match)
• Shielding: Shielded configuration (must match)
• Mounting: Surface mount (must match)
• DC Resistance: Must be compatible with circuit requirements
• Operating Temperature Range: Must support -40°C minimum and 105°C maximum
• Test Frequency: 100 kHz (standard reference)

The substitute parts DR73-331-R and DR74-331-R from Eaton - Electronics Division meet these core substitution criteria. Both maintain the 330 µH inductance, ±20% tolerance, shielded ferrite drum core construction, and surface mount configuration. Current ratings and saturation characteristics vary to accommodate different application requirements.

Parameter Comparison

Engineering Selection Recommendations

DR73-331-R is suitable for applications requiring exact current rating matching at 420 mA. This part maintains the same continuous current specification as the CLF7045T-331M while offering an extended operating temperature range to 125°C. The higher DC resistance of 1.59 Ohm should be evaluated against circuit power dissipation requirements. This substitute is ROHS3 compliant and actively manufactured.

DR74-331-R is appropriate for applications where higher current capacity is beneficial. With a 450 mA current rating and 540 mA saturation current, this part provides additional design margin. The DC resistance of 1.41 Ohm is closer to the original specification than DR73-331-R. This substitute also supports the extended -40°C to 125°C temperature range and is ROHS3 compliant with active production status.

Both substitutes are available in Tape & Reel packaging and carry REACH Unaffected and EAR99 classifications matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can DR73-331-R or DR74-331-R be used interchangeably with CLF7045T-331M?

A: Both parts are functionally equivalent substitutes based on inductance value, tolerance, core type, shielding, and mounting configuration. Selection between them depends on current rating requirements and DC resistance tolerance in your specific circuit. DR74-331-R offers higher current capacity; DR73-331-R matches the original current rating exactly.

Q: What is the impact of different DC resistance values?

A: The CLF7045T-331M specifies 1.236 Ohm maximum DCR, while DR73-331-R is 1.59 Ohm and DR74-331-R is 1.41 Ohm. Higher DCR increases power dissipation in the inductor. Verify that your circuit design can accommodate the increased resistive losses before selecting a substitute with higher DCR.

Q: Are the substitute parts compatible with the original operating temperature range?

A: Both DR73-331-R and DR74-331-R support -40°C to 125°C, which exceeds the original CLF7045T-331M range of -40°C to 105°C. This provides additional thermal margin for new designs.

Q: What packaging differences exist?

A: The CLF7045T-331M uses nonstandard packaging, while both substitutes are supplied in Tape & Reel (TR) format. Verify that your assembly equipment and PCB footprint accommodate the Tape & Reel packaging specification.

Q: Are the substitute parts RoHS compliant?

A: Yes, both DR73-331-R and DR74-331-R are ROHS3 compliant. The original CLF7045T-331M RoHS status is not specified in the provided data.

Q: What is the difference in saturation current between the parts?

A: CLF7045T-331M has Isat of 490 mA, DR73-331-R has 440 mA, and DR74-331-R has 540 mA. Saturation current defines the point at which the inductor's inductance begins to degrade. Ensure your circuit's maximum current does not exceed the saturation specification of your selected substitute.