RL855-681K-RC Equivalent & Substitute Parts

Part Overview

The RL855-681K-RC is a 680 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 320 mA maximum current with 3.25Ohm DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -30°C to 100°C and is ROHS3 compliant.

Substiute Parts

RL855-681K-RC

Bourns Inc.In Stock: 1166RL855-681K-RC Datasheet

Current PartRFQ

768772681

Würth ElektronikIn Stock: 1180768772681 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RL855-681K-RC is determined by the following critical parameters:

• Inductance Value: Must be 680 µH with ±10% tolerance
• Core Material & Type: Ferrite, unshielded drum core construction
• Mounting Configuration: Through hole, radial vertical cylinder package
• Physical Dimensions: 0.307" diameter (7.80mm) to maintain PCB footprint compatibility
• Electrical Compliance: ROHS3 compliance and EAR99 classification

The substitute part 768772681 (Würth Elektronik WE-TI HV series) meets these core substitution criteria. While it exhibits improved electrical performance characteristics (higher current rating and lower DCR), it maintains the same inductance value, core type, mounting method, and physical diameter required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The 768772681 (Würth Elektronik WE-TI HV) is a direct substitute for the obsolete RL855-681K-RC. Both components maintain identical inductance specifications, core construction, and physical footprint. The substitute part carries active product status, ensuring long-term availability and supply chain continuity.

Both parts are ROHS3 compliant, REACH unaffected, and classified under EAR99, meeting regulatory requirements for equivalent component selection. The Würth Elektronik part provides enhanced electrical performance with higher current rating (520 mA vs. 320 mA) and lower DC resistance (1.68Ohm vs. 3.25Ohm), along with an extended operating temperature range (-40°C to 125°C vs. -30°C to 100°C).

Frequently Asked Questions (FAQ)

Q: Can the 768772681 be used as a direct replacement for the RL855-681K-RC?

A: Yes. Both components share identical inductance values (680 µH ±10%), core material (ferrite unshielded drum core), mounting type (through hole), and physical diameter (7.80mm). PCB footprint compatibility is maintained.

Q: What are the key differences between these parts?

A: The primary differences are current rating (320 mA vs. 520 mA), DC resistance (3.25Ohm vs. 1.68Ohm), and operating temperature range (-30°C to 100°C vs. -40°C to 125°C). The substitute part offers improved electrical performance and wider temperature operation.

Q: Does the height difference affect PCB layout?

A: The RL855-681K-RC has a seated height of 0.217" (5.50mm), while the 768772681 measures 0.394" (10.00mm). PCB clearance and component spacing must be verified during layout review.

Q: Are both parts compliant with current regulations?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes.

Q: Why is the RL855-681K-RC listed as obsolete?

A: Bourns Inc. has discontinued this product line. The 768772681 from Würth Elektronik provides equivalent functionality with active product status and improved specifications.