7447412331 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 7447412331 is a 330 µH unshielded drum core wirewound inductor rated for 500 mA with a maximum DC resistance of 2Ohm. This through-hole component operates across -40°C to 125°C and is currently in active production status. Substitute parts become necessary when the primary component reaches end-of-life, experiences supply constraints, or when design requirements permit operation within alternative electrical and mechanical specifications.

Substiute Parts

7447412331

Würth ElektronikIn Stock: 9857447412331 Datasheet

Current PartRFQ

RL855-331K-RC

Bourns Inc.In Stock: 1195RL855-331K-RC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns Inc. RL855-331K-RC qualifies as a direct substitute based on the following alignment of critical parameters:

• Inductance value: 330 µH (identical)
• Inductance tolerance: ±10% (identical)
• Core material: Ferrite (identical)
• Shielding configuration: Unshielded (identical)
• Mounting type: Through hole (identical)
• Package configuration: Radial, vertical cylinder (identical)
• RoHS3 compliance: Confirmed for both parts

The RL855-331K-RC operates at 440 mA rated current and 1.47Ohm maximum DC resistance, both within acceptable substitution parameters for applications designed around the 7447412331 specifications.

Parameter Comparison

Engineering Selection Recommendations

The RL855-331K-RC presents a viable substitute when the 7447412331 is unavailable. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications.

The 7447412331 is recommended for new designs requiring the full -40°C to 125°C operating range and 500 mA current capacity. The RL855-331K-RC is suitable for applications operating within -30°C to 100°C and where circuit current demands do not exceed 440 mA. The lower DC resistance of the RL855-331K-RC (1.47Ohm versus 2Ohm maximum) provides reduced power dissipation in equivalent current conditions.

Note that the RL855-331K-RC carries obsolete product status, which may impact long-term availability for production quantities.

Frequently Asked Questions (FAQ)

Q: Can the RL855-331K-RC replace the 7447412331 in all applications?

A: Substitution is valid when circuit operating current remains below 440 mA and ambient temperature stays within -30°C to 100°C. Applications requiring the full 500 mA rating or extended temperature range to 125°C require the primary part.

Q: What is the impact of the 60 mA current rating difference?

A: The RL855-331K-RC is rated for 440 mA versus 500 mA for the 7447412331. Circuits designed for 500 mA operation must be re-evaluated to confirm operation below 440 mA before substitution.

Q: Are there mechanical compatibility concerns?

A: Both parts use radial, vertical cylinder through-hole packages. The RL855-331K-RC is slightly smaller (0.307" diameter versus 0.335" diameter, 0.217" height versus 0.236" height), which may provide additional PCB layout flexibility but does not prevent direct substitution in existing footprints.

Q: Does the lower DC resistance of the RL855-331K-RC affect circuit performance?

A: Lower DC resistance reduces resistive losses and heat generation at equivalent current levels. This is generally beneficial for circuit efficiency and thermal management, provided the application does not depend on the specific impedance characteristics of the 2Ohm maximum specification.

Q: Why is the RL855-331K-RC marked as obsolete?

A: Obsolete status indicates the part is no longer in active production. While existing inventory may be available, long-term supply cannot be guaranteed. The 7447412331 is recommended for designs requiring sustained component availability.