1812-124K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 1812-124K 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 759 units available in inventory.

Identifying equivalent and substitute parts becomes necessary when the primary component experiences supply constraints, when design requirements demand alternative compliance certifications, or when application parameters permit selection from multiple qualified sources within the same electrical and mechanical specifications.

Substiute Parts

1812-124K

API Delevan Inc.In Stock: 7861812-124K Datasheet

Current PartRFQ

CM453232-121JL

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1812-124K is determined by strict alignment with the following core electrical and mechanical parameters:

Mandatory Matching Parameters:

• Inductance value: 120 µH
• Package format: 1812 (4532 Metric)
• Mounting type: Surface Mount
• Shielding configuration: Unshielded
• DC resistance maximum: 8Ohm

Allowable Variation Parameters:

• Current rating: Substitute must equal or exceed 158 mA minimum
• Inductance tolerance: Substitute tolerance must be ±10% or tighter
• Operating temperature range: Substitute must cover or exceed -55°C ~ 125°C
• Q factor and self-resonant frequency: Substitute values must fall within acceptable performance bands for the application frequency

The CM453232-121JL from Bourns Inc. qualifies as a direct substitute based on matching inductance, package, mounting type, shielding, and DC resistance specifications. Differences in current rating (110 mA vs. 158 mA) and tolerance (±5% vs. ±10%) represent trade-offs that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

1812-124K (API Delevan Inc.) remains the primary selection when:

• Application requires the full 158 mA current rating
• Operating environment demands the extended low-temperature specification (-55°C minimum)
• RoHS non-compliance is acceptable for the application or market

CM453232-121JL (Bourns Inc.) is suitable as a substitute when:

• Application current requirement does not exceed 110 mA
• Operating temperature range of -40°C ~ 125°C satisfies environmental specifications
• ROHS3 compliance is required for regulatory or procurement standards
• Tighter inductance tolerance (±5%) provides design margin benefits

Both parts share identical inductance, DC resistance, package dimensions, and self-resonant frequency characteristics. Selection between them depends on current capacity requirements, temperature range constraints, and compliance certifications mandated by the end application or regional regulations.

Frequently Asked Questions (FAQ)

Q: Can CM453232-121JL replace 1812-124K in all applications?

A: No. The CM453232-121JL has a maximum current rating of 110 mA compared to 1812-124K's 158 mA. Substitution is valid only when the application current requirement does not exceed 110 mA. Additionally, the operating temperature range differs: CM453232-121JL operates from -40°C minimum, while 1812-124K extends to -55°C minimum.

Q: Are the physical dimensions identical?

A: Yes. 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). They are mechanically interchangeable on PCB layouts.

Q: What is the significance of the inductance tolerance difference?

A: The 1812-124K carries ±10% tolerance while CM453232-121JL carries ±5% tolerance. The tighter tolerance of the Bourns part provides greater inductance value consistency across production batches, which may benefit applications with strict frequency or impedance matching requirements.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance is a material composition and environmental standard, not an electrical specification. The ROHS3 compliance of CM453232-121JL does not alter its electrical characteristics. Selection based on RoHS status depends on regulatory requirements for the end product or market region.

Q: Can I use 1812-124K in applications rated for -40°C minimum?

A: Yes. The 1812-124K operating range of -55°C ~ 125°C exceeds the -40°C ~ 125°C range of CM453232-121JL. Any part qualified for -40°C minimum is also qualified for the 1812-124K's extended range.

Q: Are there differences in DC resistance?

A: No. Both parts specify 8Ohm maximum DC resistance. This parameter is identical and does not differentiate the parts.