1812-221K Equivalent & Substitute Parts Reference

Part Overview

The 1812-221K is a fixed unshielded inductor manufactured by API Delevan Inc., rated at 220 nH inductance with a maximum current rating of 708 mA and 400 mOhm maximum DC resistance. This surface mount component is housed in a 1812 (4532 Metric) package and operates across the temperature range of -55°C to 125°C. The part is currently active in production with 1380 pieces available in inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductance value and package class.

Substiute Parts

1812-221K

API Delevan Inc.In Stock: 14011812-221K Datasheet

Current PartRFQ

1812R-221K

API Delevan Inc.In Stock: 17571812R-221K Datasheet

DirectRFQ

CM453232-R22KL

Bourns Inc.In Stock: 2431CM453232-R22KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1812-221K are classified based on strict electrical and mechanical parameter alignment. The substitution logic is determined by the following critical parameters:

Primary Substitution Criteria:

• Inductance value: 220 nH (±10% tolerance maintained)
• Package / Case: 1812 (4532 Metric) surface mount
• Shielding configuration: Unshielded
• Operating temperature range: Minimum -55°C to 125°C coverage
• Mounting type: Surface mount

Secondary Compatibility Parameters:

• Current rating: Equal to or greater than 708 mA
• DC resistance: Equal to or less than 400 mOhm maximum
• Frequency test point: 25 MHz or 25.2 MHz

Parts meeting all primary criteria and maintaining secondary parameter specifications are classified as direct or similar substitutes. Deviations in any primary parameter disqualify a part from substitution consideration.

Parameter Comparison

Engineering Selection Recommendations

1812R-221K (API Delevan Inc.) - Direct Substitute

The 1812R-221K is a direct substitute for the 1812-221K. Both parts are manufactured by API Delevan Inc. and share identical electrical specifications: 220 nH inductance, 708 mA current rating, 400 mOhm maximum DC resistance, and 30 Q @ 25 MHz. Both operate across -55°C to 125°C and are housed in the 1812 (4532 Metric) package. The primary distinction is product compliance: the 1812R-221K is ROHS3 compliant, whereas the 1812-221K is RoHS non-compliant. Selection of the 1812R-221K is appropriate for applications requiring RoHS3 compliance or when regulatory requirements mandate compliant components.

CM453232-R22KL (Bourns Inc.) - Similar Substitute

The CM453232-R22KL is a similar substitute manufactured by Bourns Inc. This part maintains the 220 nH inductance value, ±10% tolerance, and 1812 (4532 Metric) package configuration. The CM453232-R22KL exhibits improved DC resistance performance at 250 mOhm maximum (compared to 400 mOhm) and higher Q factor at 40 @ 25.2 MHz (compared to 30 @ 25 MHz). However, the current rating is 665 mA, which is 43 mA lower than the 1812-221K specification. The operating temperature range is -40°C to 125°C, which does not extend to -55°C. The CM453232-R22KL is ROHS3 compliant. This part is suitable for applications where the reduced current rating and narrower temperature range are acceptable, and where improved DC resistance and Q factor provide circuit performance benefits.

Frequently Asked Questions (FAQ)

Q: Can the 1812R-221K be used as a direct replacement for the 1812-221K?

A: Yes. The 1812R-221K is a direct substitute. Both parts share identical electrical specifications (220 nH, 708 mA, 400 mOhm DCR) and mechanical compatibility (1812 package, surface mount). The 1812R-221K is ROHS3 compliant, whereas the 1812-221K is not. Selection depends on regulatory and compliance requirements for your application.

Q: What are the limitations of using the CM453232-R22KL as a substitute?

A: The CM453232-R22KL has two parameter deviations: current rating of 665 mA (43 mA below the 1812-221K specification) and operating temperature range of -40°C to 125°C (does not extend to -55°C). These limitations must be evaluated against your circuit requirements. The part offers advantages in DC resistance (250 mOhm) and Q factor (40 @ 25.2 MHz).

Q: Are all three parts mechanically compatible in the same PCB footprint?

A: Yes. All three 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). Surface mount compatibility is maintained across all three parts.

Q: What is the difference between iron core and ferrite core construction in these inductors?

A: The 1812-221K and 1812R-221K use iron core material, while the CM453232-R22KL uses ferrite core material. This material difference contributes to the variations in Q factor, self-resonant frequency, and DC resistance observed between the parts. Core material selection affects frequency response and thermal characteristics.

Q: Which substitute should I select for a new design?

A: For new designs, the 1812R-221K is recommended as the primary substitute due to identical electrical specifications and ROHS3 compliance. The CM453232-R22KL is suitable only if your application can accommodate the reduced current rating (665 mA) and narrower temperature range (-40°C to 125°C minimum).

Q: Are there any moisture sensitivity considerations for these parts?

A: All three parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity limitations. Standard handling and storage practices are sufficient for all three inductors.