1812-394K Equivalent & Substitute Parts

Part Overview

The 1812-394K is a 390 µH unshielded inductor manufactured by API Delevan Inc., rated for 100 mA maximum current with 20Ohm DC resistance in a 1812 (4532 Metric) surface mount package. This component operates across the -55°C to 125°C temperature range and maintains active product status. Equivalent and substitute parts are identified when identical or compatible electrical and mechanical specifications are available from alternative manufacturers, providing supply chain flexibility and design redundancy.

Substiute Parts

1812-394K

API Delevan Inc.In Stock: 9521812-394K Datasheet

Current PartRFQ

CM453232-391JL

Bourns Inc.In Stock: 2802CM453232-391JL Datasheet

SimilarRFQ

CM453232-391KL

Bourns Inc.In Stock: 2800CM453232-391KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1812-394K is determined by maintaining the following critical electrical and mechanical parameters:

Electrical Parameters: Inductance value (390 µH), inductance tolerance capability, current rating, DC resistance, core material (ferrite), shielding configuration (unshielded), operating temperature range, and frequency response characteristics.

Mechanical Parameters: Package type (1812 / 4532 Metric), surface mount configuration, physical dimensions (0.177" L x 0.126" W, 4.50mm x 3.20mm), and maximum seated height (0.134" / 3.40mm).

The substitute parts CM453232-391JL and CM453232-391KL from Bourns Inc. share identical inductance values, ferrite core material, unshielded configuration, and identical package dimensions. Both operate within compatible temperature ranges and maintain the same mounting type. These components differ in current rating (80 mA versus 100 mA) and DC resistance (18Ohm maximum versus 20Ohm maximum), representing acceptable trade-offs where lower current and resistance values provide improved performance margins.

Parameter Comparison

Engineering Selection Recommendations

The Bourns CM453232-391JL and CM453232-391KL inductors are acceptable substitutes for applications where the 1812-394K is specified, with the following considerations:

CM453232-391JL provides ±5% inductance tolerance, superior to the ±10% specification of the original part. The 80 mA current rating requires verification that circuit maximum current does not exceed this value. The ROHS3 compliant status may be required for regulatory compliance in environmentally restricted regions.

CM453232-391KL maintains ±10% inductance tolerance matching the original specification. Like the -391JL variant, the 80 mA current rating and ROHS3 compliance status apply. The lower minimum operating temperature (-40°C versus -55°C) requires validation if the design operates below -40°C.

Both Bourns variants exhibit lower DC resistance (18Ohm versus 20Ohm maximum), resulting in reduced power dissipation. The frequency response characteristics remain equivalent across both substitute parts and the original component.

Frequently Asked Questions (FAQ)

Can CM453232-391JL or CM453232-391KL be used as direct substitutes for 1812-394K?

Both Bourns inductors share the same inductance value (390 µH), core material (ferrite), package dimensions (1812 / 4532 Metric), and shielding configuration. Direct substitution is possible where circuit maximum current does not exceed 80 mA and operating temperature remains above -40°C.

What is the difference between CM453232-391JL and CM453232-391KL?

The primary difference is inductance tolerance. CM453232-391JL specifies ±5% tolerance, while CM453232-391KL specifies ±10% tolerance. Both share identical current rating (80 mA), DC resistance (18Ohm maximum), and operating temperature range (-40°C to 125°C).

How does the 80 mA current rating of Bourns parts affect compatibility?

The 1812-394K supports 100 mA maximum current. Substitution with Bourns parts is valid only for applications where circuit current remains at or below 80 mA. Applications requiring the full 100 mA specification cannot use these substitutes.

What does RoHS3 compliance mean for the Bourns parts?

ROHS3 compliance indicates adherence to EU Directive 2011/65/EU and the 2015/863/EU phthalate restriction. The original 1812-394K is RoHS non-compliant. If design requirements mandate RoHS compliance, both Bourns variants satisfy this requirement.

Are there any thermal performance differences between the parts?

The 1812-394K operates from -55°C to 125°C. Bourns variants operate from -40°C to 125°C. Applications requiring operation below -40°C must use the original API Delevan part. Above -40°C, thermal specifications are compatible.

Do the DC resistance values affect circuit behavior?

The Bourns substitutes specify 18Ohm maximum DC resistance compared to 20Ohm maximum for the 1812-394K. Lower DC resistance results in reduced power dissipation in the inductor, which may improve overall circuit efficiency.