1812-682K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 1812-682K is a 6.8 µH unshielded ferrite core inductor manufactured by API Delevan Inc., designed for surface mount applications in the 1812 (4532 Metric) package format. This component operates across an industrial temperature range of -55°C to 125°C with a maximum DC resistance of 1.2Ohm and supports a current rating of 409 mA. The part is currently in active production status with 882 pieces available in inventory. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and package standardization to support component procurement flexibility and supply chain continuity.

Substiute Parts

1812-682K

API Delevan Inc.In Stock: 9431812-682K Datasheet

Current PartRFQ

CM453232-6R8JL

Bourns Inc.In Stock: 5490CM453232-6R8JL Datasheet

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CM453232-6R8KL

Bourns Inc.In Stock: 1852CM453232-6R8KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1812-682K are qualified based on the following critical parameters that determine functional interchangeability:

Electrical Matching Criteria:

• Inductance value: 6.8 µH (exact match required)
• DC Resistance: 1.2Ohm maximum (matching specification)
• Q Factor: 50 @ 7.9-7.96 MHz (within measurement tolerance)
• Self Resonant Frequency: 27 MHz (matching specification)
• Core Material: Ferrite (matching specification)

Mechanical Compatibility Criteria:

• Package / Case: 1812 (4532 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Physical Dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm) (exact match required)
• Height - Seated (Max): 0.134" (3.40mm) (exact match required)
• Shielding: Unshielded (matching specification)

Environmental & Compliance Criteria:

• Moisture Sensitivity Level: 1 (Unlimited) (matching specification)
• REACH Status: REACH Unaffected (matching specification)
• ECCN: EAR99 (matching specification)

The substitute parts CM453232-6R8JL and CM453232-6R8KL, both manufactured by Bourns Inc., meet all electrical and mechanical compatibility requirements. These parts are qualified as direct substitutes based on matching inductance, DC resistance, frequency characteristics, package dimensions, and environmental ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Rating Limitation:

The substitute parts CM453232-6R8JL and CM453232-6R8KL are rated for 285 mA maximum current, compared to the 1812-682K rating of 409 mA. Circuit designs requiring current levels between 285 mA and 409 mA cannot use these substitutes without thermal and saturation analysis. Applications operating at or below 285 mA current levels are compatible with either substitute part.

RoHS Compliance Status:

The 1812-682K is RoHS non-compliant. Both substitute parts (CM453232-6R8JL and CM453232-6R8KL) are ROHS3 compliant. Design requirements mandating RoHS compliance necessitate selection of the Bourns substitute parts.

Operating Temperature Range:

The 1812-682K operates from -55°C to 125°C. The Bourns substitutes operate from -40°C to 125°C. Applications requiring operation below -40°C must retain the 1812-682K.

Packaging and Procurement:

CM453232-6R8JL is supplied in Tape & Reel (TR) format with 5400 pieces in inventory. CM453232-6R8KL is supplied in Cut Tape (CT) & Digi-Reel® format with 1800 pieces in inventory. Packaging selection depends on assembly equipment compatibility and procurement volume requirements.

Inductance Tolerance:

CM453232-6R8JL offers ±5% tolerance, providing tighter inductance control compared to the ±10% tolerance of both the 1812-682K and CM453232-6R8KL. Applications with strict inductance specifications benefit from CM453232-6R8JL selection.

Frequently Asked Questions (FAQ)

Q: Can CM453232-6R8JL or CM453232-6R8KL be used as direct replacements for 1812-682K in all applications?

A: No. The substitute parts are rated for 285 mA maximum current, while the 1812-682K is rated for 409 mA. Direct substitution is valid only for circuits operating at or below 285 mA. Circuits requiring higher current must retain the original 1812-682K or conduct thermal analysis to confirm the substitute part performance.

Q: What is the difference between CM453232-6R8JL and CM453232-6R8KL?

A: Both parts are electrically identical with matching inductance, DC resistance, and frequency characteristics. The primary differences are: (1) CM453232-6R8JL has ±5% inductance tolerance versus ±10% for CM453232-6R8KL; (2) CM453232-6R8JL is supplied in Tape & Reel (TR) format with 5400 pieces in stock; (3) CM453232-6R8KL is supplied in Cut Tape (CT) & Digi-Reel® format with 1800 pieces in stock. Selection depends on tolerance requirements and assembly equipment compatibility.

Q: Are the physical dimensions identical between the main part and substitutes?

A: Yes. All three parts use the 1812 (4532 Metric) package with identical dimensions of 0.177" L x 0.126" W (4.50mm x 3.20mm) and maximum seated height of 0.134" (3.40mm). PCB layout and assembly tooling are compatible across all three parts.

Q: What is the impact of the lower current rating on substitute parts?

A: The 285 mA current rating of the Bourns substitutes is the maximum continuous current the inductor can handle without exceeding design thermal and saturation limits. Exceeding this rating results in increased core losses, temperature rise, and potential inductance degradation. Circuit designs must operate within the 285 mA limit when using substitute parts.

Q: Does the operating temperature range difference affect substitution?

A: The 1812-682K operates from -55°C to 125°C, while Bourns substitutes operate from -40°C to 125°C. Applications requiring operation below -40°C must use the 1812-682K. Applications within the -40°C to 125°C range are compatible with all three parts.

Q: What is the significance of RoHS compliance status?

A: The 1812-682K is RoHS non-compliant, while both Bourns substitutes are ROHS3 compliant. Products subject to RoHS regulations or customer requirements mandating RoHS compliance must use CM453232-6R8JL or CM453232-6R8KL. Non-regulated applications may use any of the three parts based on other selection criteria.

Q: How do the inductance tolerances affect circuit performance?

A: The 1812-682K and CM453232-6R8KL both have ±10% inductance tolerance, while CM453232-6R8JL has ±5% tolerance. Circuits with tight inductance specifications benefit from the tighter tolerance of CM453232-6R8JL. Applications with relaxed inductance requirements are compatible with all three parts.

Q: Are there any differences in core construction between the parts?

A: The 1812-682K uses ferrite core construction. The Bourns substitutes use ferrite drum core wirewound construction. Both core types are unshielded and deliver matching electrical performance at the specified frequency and Q factor. The different construction methods do not affect electrical interchangeability within the specified current and temperature limits.