L1007C331KPWST Equivalent & Substitute Parts

Part Overview

The L1007C331KPWST is a 330 µH unshielded drum core wirewound inductor manufactured by KEMET in the 1007 (2518 Metric) surface mount package. This component is rated for 30 mA continuous current with 7Ohm DC resistance and operates across the temperature range of -40°C to 105°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain the same inductance value, package footprint, and core material while accommodating variations in current rating and DC resistance within acceptable design parameters.

Substiute Parts

L1007C331KPWST

KEMETIn Stock: 872L1007C331KPWST Datasheet

Current PartRFQ

CBC2518T331K

Taiyo YudenIn Stock: 2123CBC2518T331K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L1007C331KPWST is determined by strict equivalence in the following parameters:

Critical Matching Parameters:

• Inductance value: 330 µH
• Inductance tolerance: ±10%
• Package / Case: 1007 (2518 Metric)
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Operating temperature range: -40°C to 105°C
• Self-resonant frequency: 4.5 MHz
• Inductance test frequency: 796 kHz

Allowable Variation Parameters:

• Current rating: Substitute parts may exceed the original 30 mA rating
• DC resistance (DCR): Substitute parts may vary from the original 7Ohm specification
• RoHS and MSL compliance: Substitute parts must maintain or exceed compliance levels

The CBC2518T331K from Taiyo Yuden meets all critical matching parameters and qualifies as a direct substitute despite differences in current rating (90 mA versus 30 mA) and DC resistance (15.99Ohm Max versus 7Ohm).

Parameter Comparison

Engineering Selection Recommendations

The CBC2518T331K from Taiyo Yuden is a qualified substitute for the obsolete L1007C331KPWST. Both components share identical inductance specifications, package dimensions, core material, and operating temperature range. The substitute part maintains ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with current manufacturing and environmental standards.

The CBC2518T331K exhibits higher current rating (90 mA versus 30 mA) and increased DC resistance (15.99Ohm Max versus 7Ohm). These differences do not preclude substitution in applications where the original 30 mA current requirement is maintained. Circuit designers must verify that the increased DC resistance does not introduce unacceptable power dissipation or voltage drop in the target application.

The Taiyo Yuden part is classified as "Not For New Designs," indicating limited long-term availability. For new product development, evaluation of alternative 330 µH inductors in the 1007 package from active manufacturers is recommended to ensure supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the CBC2518T331K replace the L1007C331KPWST in all applications?

A: The CBC2518T331K is electrically and mechanically compatible with the L1007C331KPWST for applications operating at or below 30 mA. The higher DC resistance of the substitute part (15.99Ohm Max versus 7Ohm) results in increased power dissipation. Circuit designers must confirm that this additional dissipation does not exceed thermal or performance requirements.

Q: What is the significance of the different current ratings?

A: The L1007C331KPWST is rated for 30 mA continuous current, while the CBC2518T331K is rated for 90 mA. The higher rating of the substitute part indicates greater current-handling capability. When operating the CBC2518T331K at or below 30 mA, the component operates well within its rated capacity and is suitable for direct substitution.

Q: Are the package dimensions identical between these parts?

A: Yes. Both the L1007C331KPWST and CBC2518T331K use the 1007 (2518 Metric) package with identical dimensions: 0.098" L x 0.071" W (2.50mm x 1.80mm) and maximum seated height of 0.079" (2.00mm). PCB footprints and assembly processes are interchangeable.

Q: How does the increased DC resistance affect circuit performance?

A: The CBC2518T331K exhibits 15.99Ohm Max DC resistance compared to 7Ohm for the original part. In circuits where the inductor carries current, this resistance increase generates additional heat according to P = I²R. For a 30 mA application, the power dissipation difference is approximately 4.5 mW. Circuit designers must evaluate whether this additional dissipation is acceptable for the target application.

Q: Are both parts RoHS compliant?

A: Yes. Both the L1007C331KPWST and CBC2518T331K are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating, meeting current environmental and manufacturing standards.

Q: Why is the CBC2518T331K marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that the manufacturer (Taiyo Yuden) is not actively promoting this part for new product development and may have limited long-term availability. While suitable for replacement in existing applications, new designs should consider alternative suppliers or part numbers with active production status.