1812-124J Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 1812-124J is a fixed unshielded inductor manufactured by API Delevan Inc., designed for surface mount applications in the 1812 (4532 Metric) package format. This component delivers 120 µH inductance with a maximum current rating of 158 mA and 8Ohm DC resistance. The part is currently in active production status with 873 pieces available in inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining mechanical compatibility with the 1812 package footprint. Alternative sources become necessary for supply chain continuity, inventory availability, or compliance requirements.

Substiute Parts

1812-124J

API Delevan Inc.In Stock: 9651812-124J Datasheet

Current PartRFQ

CM453232-121JL

Bourns Inc.In Stock: 2932CM453232-121JL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1812-124J is determined by strict alignment of the following critical parameters:

Electrical Parameters (Must Match):

• Inductance value: 120 µH
• Inductance tolerance: ±5%
• DC resistance: 8Ohm maximum
• Shielding configuration: Unshielded

Mechanical Parameters (Must Match):

• Package designation: 1812 (4532 Metric)
• Mounting type: Surface Mount
• Physical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm)
• Maximum seated height: 0.134" (3.40mm)

Performance Parameters (Must Be Compatible):

• Current rating: Equal to or greater than 158 mA
• Operating temperature range: Must encompass -55°C ~ 125°C or be a subset within this range
• Q factor and self-resonant frequency: Within acceptable operating bandwidth

The substitute part CM453232-121JL from Bourns Inc. meets these criteria with equivalent inductance, tolerance, DC resistance, and package specifications. The current rating of 110 mA is lower than the main part specification and represents a design constraint for applications requiring the full 158 mA capability.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (1812-124J): The API Delevan 1812-124J is suitable for applications requiring the full 158 mA current rating within the extended temperature range of -55°C to 125°C. This part is currently in active production with adequate inventory. However, the part carries RoHS non-compliant status, which may restrict use in regulated markets or applications with RoHS compliance mandates.

Substitute Part (CM453232-121JL): The Bourns CM453232-121JL provides electrical and mechanical equivalence with ROHS3 compliance certification. This substitute is appropriate for applications where:

• Current requirements do not exceed 110 mA
• Operating temperature range remains within -40°C to 125°C
• RoHS compliance is required or preferred

The substitute part offers superior inventory availability (2914 pieces) and regulatory compliance status. The narrower temperature range and reduced current rating must be evaluated against specific circuit requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can the CM453232-121JL directly replace the 1812-124J in all applications?

A: Direct replacement is valid only when circuit current requirements do not exceed 110 mA and operating temperatures remain within -40°C to 125°C. Applications requiring the full 158 mA rating or extended low-temperature operation below -40°C require the original 1812-124J specification.

Q: What is the impact of the current rating difference between these parts?

A: The 1812-124J supports 158 mA while the CM453232-121JL supports 110 mA. This 48 mA difference represents the maximum safe operating current. Exceeding the substitute part's rating introduces saturation risk and potential thermal stress. Circuit analysis must confirm actual current draw remains below 110 mA for safe substitution.

Q: Are the physical footprints identical?

A: Both parts use the 1812 (4532 Metric) package with identical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm) and maximum seated height of 0.134" (3.40mm). PCB layout and reflow profiles require no modification for mechanical compatibility.

Q: What is the significance of the RoHS compliance difference?

A: The 1812-124J is RoHS non-compliant while the CM453232-121JL is ROHS3 compliant. RoHS3 compliance indicates the part meets current European Union restrictions on hazardous substances. Applications subject to RoHS regulations, export restrictions, or customer compliance requirements must use the ROHS3-compliant substitute.

Q: How do the Q factors compare between these inductors?

A: Both parts specify Q of 40, measured at slightly different frequencies (790 kHz for 1812-124J and 796 kHz for CM453232-121JL). This 6 kHz difference is negligible for practical circuit applications. Quality factor equivalence confirms similar performance in resonant and filtering circuits.

Q: What is the operating temperature constraint for the substitute part?

A: The CM453232-121JL operates from -40°C to 125°C, compared to the 1812-124J range of -55°C to 125°C. The substitute part cannot be used in applications requiring operation below -40°C. Verify minimum operating temperature requirements in circuit specifications before substitution.

Q: Are both parts available in Tape & Reel packaging?

A: Both the 1812-124J and CM453232-121JL are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. No packaging format conversion is required for manufacturing compatibility.