CLF12555T-331M Equivalent & Substitute Parts

Part Overview

The CLF12555T-331M is a 330 µH shielded drum core, wirewound inductor manufactured by TDK Corporation, rated for 700 mA with a maximum DC resistance of 672mOhm. This surface mount component operates across -40°C to 125°C and is designed for applications requiring fixed inductance in compact nonstandard packages. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Substiute Parts

CLF12555T-331M

TDK CorporationIn Stock: 1103CLF12555T-331M Datasheet

Current PartRFQ

CDRH125/LDNP-331MC

Sumida America Components Inc.In Stock: 1105CDRH125/LDNP-331MC Datasheet

MFR RecommendedRFQ

CDRH12D58RNP-331MC

Sumida America Components Inc.In Stock: 874CDRH12D58RNP-331MC Datasheet

MFR RecommendedRFQ

SRR1240-331K

Bourns Inc.In Stock: 6470SRR1240-331K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CLF12555T-331M is determined by the following core parameters:

• Inductance value: 330 µH (exact match required)
• Inductance tolerance: ±20% or tighter
• Shielding: Shielded configuration
• Core material: Ferrite
• Mounting type: Surface Mount
• Test frequency: 100 kHz
• Operating temperature range: Must support -40°C minimum and 125°C maximum, or equivalent operational envelope

Current rating and DC resistance are secondary selection criteria. Substitute parts must maintain the same inductance specification and shielding characteristics. All qualified substitutes are surface mount ferrite-core inductors tested at 100 kHz with operating ranges compatible with the original specification.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts meet the core electrical specifications of the CLF12555T-331M. Selection should be based on the following criteria:

CDRH125/LDNP-331MC (Sumida America Components Inc.): Active product with higher current rating (850 mA) and comparable DC resistance (710mOhm Max). Operating temperature range extends to 100°C, which is 25°C below the original specification. ROHS3 compliant. Suitable for applications where the upper temperature limit of 100°C is acceptable.

CDRH12D58RNP-331MC (Sumida America Components Inc.): Active product with the highest current rating (900 mA) and lowest DC resistance (544mOhm Max). Operating temperature range extends to 105°C. ROHS3 compliant. Provides improved electrical performance with reduced losses. Suitable for applications requiring lower resistance characteristics.

SRR1240-331K (Bourns Inc.): Active product with tighter inductance tolerance (±10% versus ±20%), matching the original operating temperature range (-40°C ~ 125°C). Higher DC resistance (950mOhm Max) and lower saturation current (750mA). ROHS3 compliant and REACH unaffected. Suitable for applications requiring full temperature range operation and tighter inductance tolerance.

Frequently Asked Questions (FAQ)

Q: Can CDRH125/LDNP-331MC be used as a direct replacement for CLF12555T-331M?

A: CDRH125/LDNP-331MC meets the core inductance, tolerance, shielding, and core material specifications. However, its maximum operating temperature is 100°C compared to the original 125°C. Substitution is valid only if the application does not require operation above 100°C.

Q: What is the difference between CDRH12D58RNP-331MC and CDRH125/LDNP-331MC?

A: Both are Sumida products with 330 µH inductance and ±20% tolerance. CDRH12D58RNP-331MC offers higher current rating (900 mA versus 850 mA), lower DC resistance (544mOhm versus 710mOhm), and slightly higher maximum operating temperature (105°C versus 100°C).

Q: Why does SRR1240-331K have higher DC resistance than the original part?

A: DC resistance is a secondary parameter determined by wire gauge and core design. SRR1240-331K prioritizes tighter inductance tolerance (±10%) and full temperature range operation (-40°C ~ 125°C), which may result in different resistance characteristics while maintaining the 330 µH inductance specification.

Q: Are all substitute parts surface mount compatible with the original PCB layout?

A: All substitutes are surface mount inductors. Physical dimensions vary slightly: CLF12555T-331M is 12.50mm x 12.10mm x 5.85mm; CDRH125/LDNP-331MC and CDRH12D58RNP-331MC are 12.00mm x 12.00mm x 6.00mm; SRR1240-331K is 12.50mm x 12.50mm x 4.50mm. PCB footprint compatibility must be verified before substitution.

Q: Which substitute part offers the best overall performance match?

A: SRR1240-331K provides the closest electrical and thermal match, maintaining the full -40°C ~ 125°C operating range and offering tighter inductance tolerance (±10%). CDRH12D58RNP-331MC offers superior electrical performance with lower DC resistance and higher current rating, though with a reduced maximum operating temperature of 105°C.