1812-331K Equivalent & Substitute Parts

Part Overview

The 1812-331K is a fixed unshielded inductor manufactured by API Delevan Inc., rated at 330 nH inductance with a maximum current rating of 604 mA and 550mOhm DC resistance. This component is designed for surface mount applications in the 1812 (4532 Metric) package format and is currently in active production status. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design optimization requires alternative performance characteristics within acceptable electrical and mechanical parameters.

Substiute Parts

1812-331K

API Delevan Inc.In Stock: 8031812-331K Datasheet

Current PartRFQ

CM453232-R33KL

Bourns Inc.In Stock: 1099CM453232-R33KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1812-331K is determined by the following critical parameters:

• Inductance value: 330 nH with ±10% tolerance
• Package format: 1812 (4532 Metric) surface mount
• Physical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm), Height 0.134" max (3.40mm)
• Current rating: minimum 604 mA
• DC resistance: acceptable range up to 550mOhm maximum
• Shielding configuration: Unshielded
• Operating temperature range: -55°C ~ 125°C minimum

The CM453232-R33KL from Bourns Inc. meets these substitution criteria with equivalent inductance, identical package dimensions, compatible current rating (605 mA), and superior DC resistance performance (280mOhm Max).

Parameter Comparison

Engineering Selection Recommendations

Both the 1812-331K and CM453232-R33KL are active production components suitable for 330 nH inductance applications in 1812 surface mount packages. The CM453232-R33KL offers improved DC resistance performance (280mOhm versus 550mOhm) and higher quality factor (40 versus 30 at test frequency), resulting in lower power dissipation and improved efficiency in RF and high-frequency circuits. The CM453232-R33KL achieves ROHS3 compliance, whereas the 1812-331K is RoHS non-compliant. Selection between these parts depends on regulatory requirements, thermal management constraints, and compliance mandates applicable to the end application. The 1812-331K supports extended low-temperature operation to -55°C, while the CM453232-R33KL operates from -40°C minimum.

Frequently Asked Questions (FAQ)

Q: Can the CM453232-R33KL directly replace the 1812-331K in existing designs?

A: Yes, for applications where the operating temperature range of -40°C to 125°C is acceptable and RoHS compliance is not a constraint. Both components share identical inductance values, tolerances, package dimensions, and mounting specifications. The superior DC resistance of the CM453232-R33KL (280mOhm versus 550mOhm) provides performance benefits with no compatibility issues.

Q: What are the key differences between these two inductors?

A: The primary differences are DC resistance (CM453232-R33KL is lower), quality factor (CM453232-R33KL is higher), RoHS compliance status (CM453232-R33KL is compliant), self-resonant frequency (1812-331K is higher), and minimum operating temperature (1812-331K extends to -55°C). Inductance, tolerance, current rating, and package dimensions are identical.

Q: Are there any PCB layout considerations when substituting these parts?

A: No. Both components use the 1812 (4532 Metric) surface mount package with identical footprint dimensions (0.177" L x 0.126" W, 4.50mm x 3.20mm) and maximum seated height (0.134", 3.40mm). PCB layouts and assembly processes require no modification.

Q: Which part should be selected for high-temperature applications?

A: The 1812-331K supports operation to 125°C maximum, while the CM453232-R33KL also supports 125°C maximum. Both are suitable for high-temperature environments within their specified ranges. The 1812-331K is required only if operation below -40°C is necessary.

Q: Does the lower DC resistance of the CM453232-R33KL affect circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation, improving overall circuit efficiency. This is a performance advantage with no negative effects on circuit functionality when inductance and current ratings remain within specification.