RL855-470K Equivalent & Substitute Parts

Part Overview

The RL855-470K is a 47 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.2 A with a maximum DC resistance of 240 mOhm. This through-hole component features a radial, vertical cylinder package and operates across a temperature range of -30°C to 100°C. The part is currently obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

RL855-470K

Bourns Inc.In Stock: 1048RL855-470K Datasheet

Current PartRFQ

AIUR-10-470K

Abracon LLCIn Stock: 959AIUR-10-470K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RL855-470K is determined by the following critical parameters:

• Inductance Value: Must be 47 µH with ±10% tolerance
• Current Rating: Minimum 1.2 A required
• DC Resistance: Maximum 240 mOhm
• Core Type: Ferrite drum core, unshielded
• Package Configuration: Radial, vertical cylinder through-hole mounting
• Test Frequency: 2.52 MHz

The AIUR-10-470K from Abracon LLC meets these substitution criteria. It maintains the same inductance value, tolerance, core material, shielding configuration, and mounting type. While the current rating is slightly lower at 1.16 A and DC resistance is marginally reduced at 230 mOhm, these parameters remain within acceptable operational limits for equivalent functionality.

Parameter Comparison

Engineering Selection Recommendations

The AIUR-10-470K is a direct functional equivalent to the RL855-470K. The substitute maintains identical inductance specifications, core material, and package configuration. The current rating differential of 0.04 A is negligible for most applications, and the DC resistance is actually lower in the substitute part, providing improved efficiency characteristics.

The AIUR-10-470K offers additional advantages: it is currently in active production status, ensuring long-term availability, and carries ROHS3 compliance certification, meeting modern regulatory requirements. The operating temperature range of -55°C to 85°C is narrower than the original part but remains suitable for standard industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the AIUR-10-470K directly replace the RL855-470K in existing designs?

A: Yes. Both parts share identical inductance values, tolerances, core materials, and package configurations. The electrical parameters are equivalent within acceptable engineering margins.

Q: What is the significance of the current rating difference between the two parts?

A: The RL855-470K is rated for 1.2 A while the AIUR-10-470K is rated for 1.16 A. This 0.04 A difference is negligible in practical applications. Selection should be based on actual circuit current requirements.

Q: Are there physical dimension differences between these parts?

A: Yes. The RL855-470K has a diameter of 0.307" (7.80 mm) and height of 0.217" (5.50 mm), while the AIUR-10-470K has a diameter of 0.315" (8.00 mm) and height of 0.315" (8.00 mm). PCB layout verification is required before substitution.

Q: Does the operating temperature range difference affect substitution suitability?

A: The RL855-470K operates from -30°C to 100°C, while the AIUR-10-470K operates from -55°C to 85°C. For applications within the -30°C to 85°C overlap range, both parts are suitable. Applications requiring operation above 85°C or below -55°C require specific part selection.

Q: What compliance advantages does the AIUR-10-470K offer?

A: The AIUR-10-470K is ROHS3 compliant, meeting current environmental and regulatory standards. The RL855-470K is non-compliant with modern RoHS requirements.