CLF12555T-680M Equivalent & Substitute Parts

Part Overview

The CLF12555T-680M is a 68 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 1.6 A continuous current with a maximum DC resistance of 150 mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain the 68 µH inductance specification while accommodating variations in current rating, DC resistance, and physical dimensions based on application requirements.

Substiute Parts

CLF12555T-680M

TDK CorporationIn Stock: 991CLF12555T-680M Datasheet

Current PartRFQ

VLS6045EX-680M

TDK CorporationIn Stock: 2438VLS6045EX-680M Datasheet

MFR RecommendedRFQ

CDRH125/LDNP-680MC

Sumida America Components Inc.In Stock: 1119CDRH125/LDNP-680MC Datasheet

MFR RecommendedRFQ

SCRH125B-680

Signal TransformerIn Stock: 867SCRH125B-680 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CLF12555T-680M is determined by the following critical parameters:

Primary Criteria (Must Match):

• Inductance: 68 µH ±20%
• Shielding: Shielded configuration
• Mounting Type: Surface Mount
• Material - Core: Ferrite
• Tolerance: ±20%

Secondary Criteria (Allowable Variation):

• Current Rating: Minimum 1.6 A (higher ratings acceptable for applications with lower current demands)
• DC Resistance (DCR): Maximum 150 mOhm (lower values acceptable; higher values require application verification)
• Operating Temperature Range: Minimum -40°C ~ 105°C (wider ranges acceptable)
• Physical Dimensions: Variations acceptable if board layout permits
• Inductance Frequency - Test: 100 kHz or 1 kHz (both acceptable for 68 µH inductors)

All substitute parts listed maintain the core 68 µH inductance specification, ferrite core material, shielded configuration, and surface mount compatibility. Variations in current rating and DC resistance reflect different design approaches while maintaining functional equivalence for the specified inductance value.

Parameter Comparison

Engineering Selection Recommendations

VLS6045EX-680M (TDK Corporation) — Active product with ROHS3 compliance. Smallest footprint (6.00mm x 6.00mm) with lowest profile (4.50mm). Current rating of 1 A is lower than the original part; suitable for applications operating below 1 A. DC resistance of 310 mOhm is higher than the original specification; verify acceptable for target application. Operating temperature range reduced to -40°C ~ 105°C; acceptable for most industrial applications.

CDRH125/LDNP-680MC (Sumida America Components Inc.) — Active product with ROHS3 compliance. Current rating of 1.85 A exceeds original specification, providing margin for higher current applications. DC resistance of 140 mOhm Max is lower than original, reducing power dissipation. Physical dimensions (12.00mm x 12.00mm) closely match original footprint. Operating temperature range of -40°C ~ 100°C is acceptable for standard industrial use.

SCRH125B-680 (Signal Transformer) — Active product with ROHS3 compliance. Highest current rating at 2 A, suitable for applications requiring maximum current capacity. DC resistance of 130 mOhm Max provides lowest power dissipation among substitutes. Physical dimensions (12.50mm x 12.50mm) and height (6.20mm) closely match original part. Operating temperature range of -40°C ~ 125°C matches original specification exactly.

Frequently Asked Questions (FAQ)

Q: Can VLS6045EX-680M replace CLF12555T-680M in all applications?

A: VLS6045EX-680M maintains the 68 µH inductance and shielded ferrite core configuration. However, the 1 A current rating is lower than the original 1.6 A specification. Substitution is valid only for applications operating at or below 1 A continuous current. The higher DC resistance (310 mOhm vs. 150 mOhm) increases power dissipation; verify thermal performance in target circuit. The reduced operating temperature range (-40°C ~ 105°C) is acceptable for most applications but not for systems requiring operation above 105°C.

Q: What are the physical dimension differences among substitutes?

A: VLS6045EX-680M is significantly smaller (6.00mm x 6.00mm x 4.50mm), suitable for space-constrained designs. CDRH125/LDNP-680MC (12.00mm x 12.00mm x 6.00mm) and SCRH125B-680 (12.50mm x 12.50mm x 6.20mm) maintain dimensions comparable to the original CLF12555T-680M (12.50mm x 12.10mm x 5.85mm). Verify PCB layout compatibility before selection.

Q: How do DC resistance differences affect circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. SCRH125B-680 (130 mOhm) and CDRH125/LDNP-680MC (140 mOhm) provide lower losses than the original (150 mOhm). VLS6045EX-680M (310 mOhm) has significantly higher resistance; acceptable only for low-current applications where dissipation is not critical. Calculate power loss (I²R) for target current to confirm acceptability.

Q: Are all substitutes RoHS3 compliant?

A: VLS6045EX-680M, CDRH125/LDNP-680MC, and SCRH125B-680 are all ROHS3 compliant. The original CLF12555T-680M compliance status is not specified. All substitutes meet current environmental and regulatory requirements for new designs.

Q: Which substitute is best for high-current applications?

A: SCRH125B-680 provides the highest current rating (2 A) and lowest DC resistance (130 mOhm Max), making it optimal for applications requiring maximum current capacity and minimal power dissipation. Operating temperature range matches the original specification (-40°C ~ 125°C).

Q: Can substitutes be used interchangeably on the same PCB?

A: Physical dimensions vary significantly. VLS6045EX-680M requires a smaller footprint and cannot be used in layouts designed for the larger original part without PCB modification. CDRH125/LDNP-680MC and SCRH125B-680 have similar footprints to the original and may be interchangeable with minor layout adjustments. Verify pad spacing and height clearance before substitution.