1812-274K Equivalent & Substitute Parts Reference

Part Overview

The 1812-274K is a fixed surface mount inductor manufactured by API Delevan Inc., rated at 270 µH inductance with 129 mA current rating and 12Ohm maximum DC resistance. This component is designed for applications requiring unshielded ferrite core inductors in compact 1812 (4532 Metric) package form factor. The part maintains active product status and operates across the industrial temperature range of -55°C to 125°C. Substitute parts are identified to address inventory availability, compliance requirements, or specific application constraints while maintaining core electrical and mechanical compatibility.

Substiute Parts

1812-274K

API Delevan Inc.In Stock: 11351812-274K Datasheet

Current PartRFQ

CM453232-271JL

Bourns Inc.In Stock: 3185CM453232-271JL Datasheet

SimilarRFQ

CM453232-271KL

Bourns Inc.In Stock: 2370CM453232-271KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1812-274K are qualified based on the following electrical and mechanical parameters:

• Inductance Value: 270 µH (exact match required)
• Package / Case: 1812 (4532 Metric) (exact match required)
• DC Resistance: 12Ohm Max (exact match required)
• Core Material: Ferrite (exact match required)
• Shielding: Unshielded (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Current Rating: Minimum 92 mA acceptable (substitute parts rated at 92 mA are suitable for applications requiring ≤92 mA)
• Inductance Tolerance: ±5% or ±10% acceptable (both within acceptable tolerance bands)
• Operating Temperature: Minimum -40°C to 125°C acceptable (substitute parts operating to -40°C are suitable for applications not requiring -55°C minimum)

The two substitute parts (CM453232-271JL and CM453232-271KL) from Bourns Inc. meet all mandatory electrical and mechanical parameters. Both are manufactured as Drum Core, Wirewound inductors with identical inductance, DC resistance, and package specifications.

Parameter Comparison

Engineering Selection Recommendations

1812-274K (API Delevan Inc.): Select this part for applications requiring the extended operating temperature range of -55°C to 125°C. This part is suitable for military, aerospace, or extreme environment applications where the lower temperature limit is critical. Current product status is active with 1035 units in stock.

CM453232-271JL (Bourns Inc.): Select this part for applications operating within -40°C to 125°C temperature range where ROHS3 compliance is required. This substitute offers ±5% inductance tolerance, providing tighter tolerance control compared to the main part. Current product status is active with 3158 units in stock.

CM453232-271KL (Bourns Inc.): Select this part for applications operating within -40°C to 125°C temperature range where ROHS3 compliance is required and ±10% inductance tolerance is acceptable. This substitute matches the inductance tolerance of the main part. Current product status is active with 2359 units in stock.

Both Bourns substitutes are ROHS3 compliant, whereas the API Delevan main part is RoHS non-compliant. Selection between CM453232-271JL and CM453232-271KL depends on tolerance requirements; both are electrically and mechanically equivalent for applications not requiring the -55°C minimum temperature specification.

Frequently Asked Questions (FAQ)

Q: Can CM453232-271JL or CM453232-271KL be used as direct replacements for 1812-274K in all applications?

A: Both Bourns parts are direct substitutes for applications operating within -40°C to 125°C. If your application requires operation below -40°C, the 1812-274K is the only suitable option among these three parts.

Q: What is the difference between CM453232-271JL and CM453232-271KL?

A: Both parts are identical except for inductance tolerance. CM453232-271JL offers ±5% tolerance, while CM453232-271KL offers ±10% tolerance. Select based on your circuit's tolerance requirements.

Q: Does the lower current rating of the Bourns parts (92 mA vs. 129 mA) affect substitution?

A: The Bourns parts are suitable substitutes only for applications drawing ≤92 mA. If your circuit requires current above 92 mA, the 1812-274K must be used.

Q: Are there compliance differences between these parts?

A: Yes. The 1812-274K is RoHS non-compliant, while both Bourns substitutes (CM453232-271JL and CM453232-271KL) are ROHS3 compliant. Select Bourns parts if RoHS compliance is required.

Q: Do all three parts use the same package?

A: Yes. All three parts use the 1812 (4532 Metric) surface mount package with identical physical dimensions: 0.177" L x 0.126" W (4.50mm x 3.20mm) and 0.134" maximum seated height (3.40mm).

Q: What is the difference in Q factor between these parts?

A: The 1812-274K has Q of 40 @ 790 kHz, while both Bourns substitutes have Q of 40 @ 796 kHz. The Q values are equivalent; the test frequency difference is negligible for most applications.