CLF12555T-331M-H Equivalent & Substitute Parts

Part Overview

The CLF12555T-331M-H is a 330 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 700 mA continuous current with 560mOhm DC resistance. This surface mount component operates across -40°C to 125°C and is designed for applications requiring ferrite core inductors in compact nonstandard packages.

The CLF12555T-331M-H carries a "Not For New Designs" product status, indicating it has been superseded or is approaching end-of-life. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support ongoing production requirements for existing applications.

Key Parameters

Parameter	Value
Inductance	330 µH
Inductance Tolerance	±20%
Current Rating	700 mA
DC Resistance (DCR)	560mOhm
Current - Saturation (Isat)	1.2A
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Package Dimensions	12.50mm x 12.50mm x 5.50mm (max)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CLF12555T-331M-H are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 330 µH (fixed requirement)
Inductance tolerance: ±20% (fixed requirement)
Core material: Ferrite (fixed requirement)
Shielding: Shielded (fixed requirement)
Mounting type: Surface Mount (fixed requirement)
RoHS compliance: ROHS3 Compliant (fixed requirement)

Allowable Variation Parameters:

Current rating: 700 mA minimum (substitutes may exceed this rating)
DC resistance: 560mOhm baseline (substitutes may vary within acceptable limits for the application)
Operating temperature range: -40°C minimum to 125°C maximum (substitutes may extend this range)
Package dimensions: Nonstandard (minor dimensional variations acceptable for surface mount compatibility)
Saturation current: 1.2A baseline (substitutes may vary)

All substitute parts listed maintain the core electrical characteristics (inductance, tolerance, core type, shielding) while offering variations in current handling capability, DC resistance, and thermal performance to support different application requirements.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (A)	Isat (A)	DCR (mOhm)	Core Material	Shielding	Temp Range (°C)	Package (mm)	Height Max (mm)	Product Status	Packaging
CLF12555T-331M-H	TDK	330 µH	±20%	0.700	1.2	560	Ferrite	Shielded	-40 ~ 125	12.50 x 12.50	5.50	Not For New Designs	Tape & Reel
CLF12577NIT-331M-D	TDK	330 µH	±20%	1.200	1.2	492 Max	Ferrite	Shielded	-55 ~ 150	12.80 x 12.50	8.00	Last Time Buy	Cut Tape
SLF12565T-331MR87-H	TDK	330 µH	±20%	0.950	0.870	592.8 Max	Ferrite	Shielded	-40 ~ 125	12.50 x 12.50	6.85	Not For New Designs	Tape & Reel
CDRH125/LDNP-331MC	Sumida	330 µH	±20%	0.850	—	710 Max	Ferrite	Shielded	-40 ~ 100	12.00 x 12.00	6.00	Active	Tape & Reel
CDRH125L125NP-331MC	Sumida	330 µH	±20%	0.900	0.900	674 Max	Ferrite	Shielded	-40 ~ 125	12.00 x 12.00	6.00	Active	Tape & Reel
CDRH12D58RNP-331MC	Sumida	330 µH	±20%	0.900	1.22	544 Max	Ferrite	Shielded	-40 ~ 105	12.00 x 12.00	6.00	Active	Tape & Reel

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

CLF12577NIT-331M-D (TDK) is the manufacturer-recommended upgrade path. It maintains TDK platform continuity, extends the operating temperature range to -55°C ~ 150°C, and increases current capacity to 1.2A with improved DC resistance (492mOhm max). However, this part carries "Last Time Buy" status and requires transition planning. Dimensional changes (height increases to 8.00mm) must be verified against PCB layout constraints.

For Active Supply Chain Status:

CDRH125L125NP-331MC (Sumida) and CDRH12D58RNP-331MC (Sumida) are both Active products, ensuring long-term availability. CDRH125L125NP-331MC provides AEC-Q200 qualification and matches the original operating temperature range (-40°C ~ 125°C) with 900mA current rating and 674mOhm max DCR. CDRH12D58RNP-331MC offers superior saturation current (1.22A) and lower DCR (544mOhm max) within the same footprint.

For Thermal Performance:

SLF12565T-331MR87-H (TDK) maintains identical footprint dimensions (12.50mm x 12.50mm) and operating temperature range but carries "Not For New Designs" status. It is suitable only for sustaining existing production where supply of the original part is exhausted.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. CDRH125L125NP-331MC includes AEC-Q200 automotive qualification, making it suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can CLF12577NIT-331M-D replace CLF12555T-331M-H directly?

A: Electrically yes, with the following considerations: CLF12577NIT-331M-D increases current capacity to 1.2A (versus 700mA), reduces DCR to 492mOhm max (versus 560mOhm), and extends temperature range to -55°C ~ 150°C. The height increases from 5.50mm to 8.00mm, requiring PCB layout verification. Packaging changes from Tape & Reel to Cut Tape may affect procurement workflows.

Q: What is the difference between TDK and Sumida substitute options?

A: TDK substitutes (CLF12577NIT-331M-D, SLF12565T-331MR87-H) maintain platform consistency but both carry end-of-life or last-time-buy status. Sumida substitutes (CDRH125L125NP-331MC, CDRH12D58RNP-331MC, CDRH125/LDNP-331MC) are all Active products with confirmed long-term availability. Sumida parts use slightly smaller footprints (12.00mm x 12.00mm versus 12.50mm x 12.50mm).

Q: Which substitute offers the best DC resistance performance?

A: CDRH12D58RNP-331MC provides the lowest maximum DCR at 544mOhm, compared to the original 560mOhm. This reduces power dissipation and heat generation. CLF12577NIT-331M-D offers 492mOhm max, providing the best performance but with last-time-buy status.

Q: Are all substitutes surface mount compatible with the original footprint?

A: All substitutes are surface mount components. However, Sumida parts use 12.00mm x 12.00mm footprints (versus original 12.50mm x 12.50mm), and height variations range from 5.50mm to 8.00mm. PCB layout and clearance verification is required before substitution.

Q: Which substitute is recommended for new designs?

A: CDRH125L125NP-331MC (Sumida) is the recommended choice for new designs. It is an Active product with AEC-Q200 qualification, matches the original operating temperature range, and provides stable long-term supply. CDRH12D58RNP-331MC is an alternative if superior saturation current (1.22A) and lower DCR (544mOhm) are required.

Q: What is the impact of DCR variation on circuit performance?

A: DCR affects power dissipation and thermal performance. Lower DCR (492-544mOhm) reduces heat generation compared to the original 560mOhm. Higher DCR (592.8-710mOhm) increases dissipation. Selection depends on thermal budget and current profile of the application. For 700mA continuous operation, DCR differences of 50-150mOhm produce measurable but typically manageable thermal effects.

Q: Can substitutes be mixed in the same production batch?

A: No. All components in a production batch should use the same part number to ensure consistent electrical and thermal characteristics. Mixing different substitutes introduces performance variability and complicates quality control and field diagnostics.

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