CLF7045T-331M-H Equivalent & Substitute Parts

Part Overview

The CLF7045T-331M-H is a 330 µH shielded drum core wirewound inductor manufactured by TDK Corporation, rated for 490 mA continuous current with 1.03Ohm DC resistance. This surface mount component operates across -40°C to 125°C and is compliant with ROHS3 standards. The part is classified as "Not For New Designs," making identification of functionally equivalent alternatives essential for ongoing production and design updates.

Substiute Parts

CLF7045T-331M-H

TDK CorporationIn Stock: 676CLF7045T-331M-H Datasheet

Current PartRFQ

CLF7045NIT-331M-D

TDK CorporationIn Stock: 1675CLF7045NIT-331M-D Datasheet

MFR RecommendedRFQ

SPD74R-334M

DelevanIn Stock: 954SPD74R-334M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CLF7045T-331M-H are selected based on the following critical parameters:

• Inductance Value: 330 µH (exact match required)
• Inductance Tolerance: ±20% (matching tolerance band)
• Core Material & Shielding: Ferrite, shielded drum core construction
• Mounting Type: Surface mount configuration
• Current Rating: Minimum 490 mA continuous current capability
• DC Resistance: Acceptable range determined by application requirements
• Operating Temperature: Minimum -40°C ~ 125°C overlap
• RoHS Compliance: ROHS3 Compliant

Two qualified substitutes meet these criteria: CLF7045NIT-331M-D (TDK Corporation) and SPD74R-334M (Delevan). Both maintain the 330 µH inductance specification, ferrite shielded drum core construction, and surface mount packaging while offering improved current ratings and active product status.

Parameter Comparison

Engineering Selection Recommendations

CLF7045NIT-331M-D is the primary recommended substitute. This TDK Corporation part maintains manufacturer continuity while offering active product status, improved saturation current (500 mA vs. 420 mA), lower DC resistance (960 mOhm Max vs. 1.03Ohm), and extended operating temperature range (-55°C ~ 150°C). The part includes AEC-Q200 automotive qualification, providing additional reliability assurance. Packaging differs as Cut Tape (CT) & Digi-Reel® versus the original Tape & Reel format.

SPD74R-334M serves as a secondary alternative from Delevan, offering active product status and equivalent current ratings (500 mA). This part maintains Tape & Reel packaging matching the original format. DC resistance is higher at 1.86 Ohm Max, and operating temperature range is -55°C ~ 125°C. The inductance test frequency differs at 1 kHz versus the original 100 kHz specification.

Both substitutes exceed the minimum 490 mA current requirement and maintain ROHS3 compliance and ferrite shielded drum core construction essential for electromagnetic performance.

Frequently Asked Questions (FAQ)

Q: Can CLF7045NIT-331M-D directly replace CLF7045T-331M-H in existing designs?

A: Yes, from an electrical standpoint. Both parts share 330 µH inductance, ±20% tolerance, ferrite shielded drum core construction, and surface mount configuration. The CLF7045NIT-331M-D offers superior specifications with higher saturation current and lower DC resistance. Packaging format differs (Cut Tape & Digi-Reel® vs. Tape & Reel), requiring supply chain adjustment.

Q: What is the significance of the DC resistance difference between CLF7045NIT-331M-D (960 mOhm) and SPD74R-334M (1.86 Ohm)?

A: DC resistance affects power dissipation and thermal performance. Lower resistance (CLF7045NIT-331M-D at 960 mOhm) generates less heat at rated current, improving efficiency. Higher resistance (SPD74R-334M at 1.86 Ohm) increases power loss. Selection depends on thermal budget and efficiency requirements of the application circuit.

Q: Why does SPD74R-334M specify inductance test frequency at 1 kHz while the original uses 100 kHz?

A: Inductance values can vary slightly with measurement frequency due to core material properties. Both parts maintain the 330 µH specification within ±20% tolerance. Application circuits should verify performance at actual operating frequencies if frequency-dependent behavior is critical.

Q: Are there packaging compatibility concerns with the substitute parts?

A: CLF7045NIT-331M-D uses Cut Tape (CT) & Digi-Reel® packaging versus the original Tape & Reel (TR) format. SPD74R-334M maintains Tape & Reel packaging. Packaging format affects pick-and-place equipment compatibility and supply logistics but not electrical performance or PCB footprint.

Q: What certifications differentiate CLF7045NIT-331M-D from the other options?

A: CLF7045NIT-331M-D includes AEC-Q200 automotive qualification, indicating compliance with automotive reliability standards. The original CLF7045T-331M-H and SPD74R-334M do not list this certification. AEC-Q200 qualification is relevant for automotive and high-reliability applications.