1812-334J Fixed Inductor 330µH 120mA Equivalent & Substitute Parts

Part Overview

The 1812-334J is a fixed surface-mount inductor manufactured by API Delevan Inc., designed for 330 µH inductance applications requiring 120 mA current capacity. This unshielded ferrite-core inductor operates across a temperature range of -55°C to 125°C and is housed in the 1812 (4532 Metric) package footprint. The component is currently in active production status. Identification of equivalent and substitute inductors is necessary when the primary part experiences supply constraints, when regulatory compliance requirements mandate alternative materials or specifications, or when system design modifications require components with adjusted electrical characteristics within compatible parameter ranges.

Substiute Parts

1812-334J

API Delevan Inc.In Stock: 8011812-334J Datasheet

Current PartRFQ

1812R-334J

API Delevan Inc.In Stock: 22831812R-334J Datasheet

DirectRFQ

CM453232-331JL

Bourns Inc.In Stock: 2444CM453232-331JL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1812-334J are qualified based on the following electrical and mechanical compatibility criteria:

Primary Selection Criteria:

• Inductance value: 330 µH (±5% tolerance maintained)
• Package / Case: 1812 (4532 Metric) identical footprint
• Core material: Ferrite
• Shielding configuration: Unshielded
• DC Resistance (DCR): 14 Ohm Max specification maintained
• Mounting type: Surface Mount compatibility
• Physical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm) with 0.134" (3.40mm) seated height

Secondary Selection Criteria (Application-Dependent):

• Current rating capability
• Operating temperature range compatibility
• Regulatory compliance status (RoHS, REACH)
• Moisture sensitivity level (MSL)

Parts are categorized into two groups: direct equivalents matching all primary parameters, and similar parts with acceptable parameter variations for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent - 1812R-334J (API Delevan Inc.)

The 1812R-334J is a direct functional equivalent to the 1812-334J. Both components match across all primary electrical parameters: 330 µH inductance, 120 mA current rating, 14 Ohm maximum DC resistance, identical package footprint, and equivalent thermal performance. The 1812R-334J is ROHS3 compliant, whereas the original 1812-334J is RoHS non-compliant. When regulatory compliance with current RoHS directives is required, the 1812R-334J serves as the appropriate substitution while maintaining full electrical and mechanical compatibility.

Similar Part - CM453232-331JL (Bourns Inc.)

The CM453232-331JL is a similar 330 µH inductor sharing the same 1812 package footprint, ferrite core material, unshielded configuration, 14 Ohm maximum DC resistance, and equivalent self-resonant frequency. This part features drum core wirewound construction and is ROHS3 compliant. The current rating is 85 mA, which is 29% lower than the 1812-334J specification. Application selection of the CM453232-331JL requires verification that the maximum current demand does not exceed 85 mA. The operating temperature range is -40°C to 125°C, restricting lower temperature operation compared to the -55°C minimum of the 1812-334J. This part is suitable for applications operating within these electrical and thermal constraints.

Frequently Asked Questions (FAQ)

Q: Can the 1812R-334J directly replace the 1812-334J in existing designs?

A: Yes. The 1812R-334J is electrically and mechanically equivalent across all primary parameters: inductance, current rating, DC resistance, and physical dimensions. Both fit the identical 1812 (4532 Metric) package footprint. The primary difference is RoHS compliance status. Substitution is transparent from a functional perspective.

Q: What is the key limitation of the CM453232-331JL when substituting for the 1812-334J?

A: The CM453232-331JL has a maximum current rating of 85 mA compared to 120 mA for the 1812-334J. This 35 mA reduction in rated current limits its application to designs where peak current demand remains below 85 mA. Additionally, the lower operating temperature minimum of -40°C (versus -55°C) may restrict use in wide-temperature applications.

Q: Are all three parts identical in physical package dimensions?

A: Yes. All three inductors share the 1812 (4532 Metric) package designation with dimensions of 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 from a PCB layout and assembly perspective.

Q: What regulatory compliance differences exist between these parts?

A: The 1812-334J is RoHS non-compliant. Both the 1812R-334J and CM453232-331JL are ROHS3 compliant. In applications subject to RoHS regulations, the 1812-334J cannot be used; selection between the 1812R-334J (direct electrical equivalent) and CM453232-331JL (current-limited alternative) depends on the application's current requirements.

Q: Can DC resistance (DCR) values be considered identical across all three parts?

A: All three parts specify a maximum DC resistance of 14 Ohm. This parameter is standardized across the comparison set, ensuring consistent power loss characteristics and thermal performance when operating at or below the respective current ratings.

Q: How does the ferrite core construction type affect selection?

A: The 1812-334J and 1812R-334J use standard ferrite cores. The CM453232-331JL uses drum core, wirewound ferrite construction. While both are ferrite-based unshielded configurations, the wirewound design may provide different frequency characteristics or mechanical stability properties. Selection depends on application-specific requirements for EMI performance or mechanical vibration environments.

Q: Are moisture sensitivity levels identical for all three parts?

A: Yes. All three inductors are rated MSL 1 (Unlimited), indicating no special moisture control requirements during storage, handling, or reflow soldering processes.