SLF12575T-331M1R0-H Equivalent & Substitute Parts

Part Overview

The SLF12575T-331M1R0-H is a 330 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 1 A continuous current with a maximum DC resistance of 408 mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors and meets AEC-Q200 automotive qualification standards.

The part is classified as "Not For New Designs," indicating it has been superseded in TDK's product portfolio. Identifying equivalent and substitute parts is necessary for ongoing production support, design updates, and supply chain continuity when the original part becomes unavailable.

Key Parameters

Parameter	Value
Inductance	330 µH
Inductance Tolerance	±20%
Current Rating	1 A
DC Resistance (DCR)	408 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Package Dimensions	12.50mm L x 12.50mm W x 7.85mm H
RoHS Status	ROHS3 Compliant
AEC-Q200 Rating	Yes

Substitute Part Grouping Explanation

Substitution eligibility for the SLF12575T-331M1R0-H is determined by the following critical parameters:

Inductance Value: Must be 330 µH (±20% tolerance acceptable)
Current Rating: Must support minimum 1 A continuous current
DC Resistance: Lower or equivalent DCR values are acceptable; higher values may impact circuit performance
Core Material: Ferrite drum core construction required
Shielding: Shielded configuration required to maintain electromagnetic isolation
Operating Temperature: Must cover the -40°C ~ 125°C range or broader
Mounting Type: Surface mount configuration required
Package Footprint: Physical dimensions must be compatible with PCB layout constraints
Compliance: ROHS3 compliance and AEC-Q200 rating preferred for automotive applications

The substitute parts listed below meet these core electrical and mechanical requirements while offering variations in current capacity, DC resistance, temperature range, and product status.

Parameter Comparison

Parameter	SLF12575T-331M1R0-H	LGJ12575TS-331M1R0-H	CLF12555T-331M-D	CLF12577NIT-331M-D	DR127-331-R	SRR1208-331KL
Manufacturer	TDK	TDK	TDK	TDK	Eaton	Bourns
Inductance	330 µH	330 µH	330 µH	330 µH	330 µH	330 µH
Inductance Tolerance	±20%	±20%	±20%	±20%	±20%	±10%
Current Rating	1 A	1.1 A	700 mA	1.2 A	1.04 A	850 mA
DC Resistance	408 mOhm Max	340 mOhm	672 mOhm Max	492 mOhm Max	574 mOhm	650 mOhm Max
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Dimensions (L x W x H)	12.50 x 12.50 x 7.85 mm	12.50 x 12.50 x 7.50 mm	12.50 x 12.10 x 5.85 mm	12.80 x 12.50 x 8.00 mm	12.50 x 12.50 x 8.00 mm	12.70 x 12.70 x 8.50 mm
Product Status	Not For New Designs	Obsolete	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q200 Rating	Yes	Yes	Yes	Yes	No	No
Packaging	Tape & Reel	Cut Tape	Tape & Reel	Cut Tape	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel

Engineering Selection Recommendations

For Automotive and AEC-Q200 Compliant Applications:

CLF12555T-331M-D and CLF12577NIT-331M-D are the primary recommended substitutes. Both are TDK products with active or last-time-buy status and maintain AEC-Q200 qualification. CLF12555T-331M-D offers active product status with extended temperature range (-40°C ~ 150°C) and lower profile (5.85 mm height), suitable for space-constrained designs. CLF12577NIT-331M-D provides higher current capacity (1.2 A) and broader temperature range (-55°C ~ 150°C), making it suitable for demanding automotive environments.

For General Industrial Applications:

LGJ12575TS-331M1R0-H provides the closest electrical match with lower DC resistance (340 mOhm) and higher current rating (1.1 A), though it carries obsolete status. DR127-331-R from Eaton offers active status and 1.04 A current rating but lacks AEC-Q200 certification. SRR1208-331KL from Bourns provides active status, tighter inductance tolerance (±10%), and extensive inventory availability, though it does not carry AEC-Q200 rating.

Compatibility Constraints:

CLF12555T-331M-D has reduced current capacity (700 mA), making it unsuitable for applications requiring the full 1 A rating of the original part. SRR1208-331KL has slightly larger footprint dimensions (12.70 x 12.70 mm) compared to the original 12.50 x 12.50 mm, requiring PCB layout verification. LGJ12575TS-331M1R0-H is obsolete and should be considered only for legacy production support.

Frequently Asked Questions (FAQ)

Q: Can CLF12555T-331M-D replace SLF12575T-331M1R0-H in all applications?

A: CLF12555T-331M-D is electrically compatible for inductance and core material but has a reduced current rating of 700 mA versus the original 1 A. It is suitable only for applications where the circuit current does not exceed 700 mA. Verify circuit requirements before substitution.

Q: What is the difference between CLF12577NIT-331M-D and CLF12555T-331M-D?

A: CLF12577NIT-331M-D has higher current capacity (1.2 A vs. 700 mA), broader temperature range (-55°C ~ 150°C vs. -40°C ~ 150°C), larger physical dimensions (12.80 x 12.50 x 8.00 mm vs. 12.50 x 12.10 x 5.85 mm), and carries last-time-buy status. CLF12555T-331M-D is active and has lower profile, making it suitable for space-constrained applications.

Q: Why does SRR1208-331KL have different inductance tolerance?

A: SRR1208-331KL from Bourns specifies ±10% inductance tolerance compared to ±20% for TDK parts. This tighter tolerance may provide improved circuit performance in applications sensitive to inductance variation, though it does not affect substitution eligibility.

Q: Is LGJ12575TS-331M1R0-H still available for new production?

A: LGJ12575TS-331M1R0-H is classified as obsolete. While inventory is available (1138 pcs), it should not be selected for new designs. Use active alternatives such as CLF12555T-331M-D or DR127-331-R instead.

Q: What are the package dimension implications for SRR1208-331KL?

A: SRR1208-331KL has footprint dimensions of 12.70 x 12.70 mm compared to the original 12.50 x 12.50 mm. Verify PCB layout and component placement clearances before substitution to ensure no mechanical conflicts with adjacent components.

Q: Which substitute part is recommended for automotive applications?

A: CLF12577NIT-331M-D is the primary recommendation for automotive applications. It maintains AEC-Q200 qualification, offers the highest current capacity (1.2 A), and supports the broadest temperature range (-55°C ~ 150°C). CLF12555T-331M-D is an alternative for space-constrained designs but has reduced current capacity.

Q: Can I use DR127-331-R or SRR1208-331KL in automotive designs?

A: DR127-331-R and SRR1208-331KL do not carry AEC-Q200 certification. They are suitable for general industrial applications but should not be used in automotive designs requiring AEC-Q200 compliance unless explicitly approved by the design authority.

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