1812-472K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 1812-472K is a fixed surface mount inductor manufactured by API Delevan Inc., featuring a 4.7 µH inductance value with 448 mA current rating and 1Ohm maximum DC resistance. This unshielded ferrite core inductor is designed for applications requiring compact form factor in the 1812 (4532 Metric) package. The part is currently active in production. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements permit component flexibility within specified electrical and mechanical parameters.

Substiute Parts

1812-472K

API Delevan Inc.In Stock: 9161812-472K Datasheet

Current PartRFQ

CM453232-4R7JL

Bourns Inc.In Stock: 4065CM453232-4R7JL Datasheet

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CM453232-4R7KL

Bourns Inc.In Stock: 25210CM453232-4R7KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1812-472K are qualified based on the following critical parameters that determine functional equivalence:

Mandatory Matching Parameters:

• Inductance value: 4.7 µH
• Package / Case: 1812 (4532 Metric)
• Core material: Ferrite
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• DC Resistance: 1Ohm Max

Allowable Variation Parameters:

• Current Rating: Substitute parts rated at 315 mA are acceptable for applications where the main part's 448 mA rating is not required
• Tolerance: Inductance tolerance of ±5% or ±10% is acceptable depending on circuit requirements
• Operating Temperature Range: Substitute parts with -40°C ~ 125°C range are acceptable for applications not requiring the main part's -55°C lower limit

The identified substitute parts CM453232-4R7JL and CM453232-4R7KL from Bourns Inc. meet all mandatory matching parameters and are classified as equivalent alternatives within the specified allowable variations.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Rating: The 1812-472K is rated for 448 mA continuous current, while both Bourns substitute parts (CM453232-4R7JL and CM453232-4R7KL) are rated for 315 mA. Selection of substitute parts is appropriate only for applications where the circuit current does not exceed 315 mA. For applications requiring the full 448 mA rating, the 1812-472K remains the required choice.

Compliance and Regulatory Status: The 1812-472K is RoHS non-compliant. Both substitute parts CM453232-4R7JL and CM453232-4R7KL are ROHS3 compliant. For applications subject to RoHS directives or customer requirements mandating RoHS compliance, the Bourns substitutes provide compliant alternatives.

Operating Temperature Range: The 1812-472K operates from -55°C to 125°C. Both Bourns substitutes operate from -40°C to 125°C. For applications requiring operation below -40°C, the 1812-472K is the appropriate selection.

Inductance Tolerance: CM453232-4R7JL offers ±5% tolerance, providing tighter inductance specification than the 1812-472K (±10%) and CM453232-4R7KL (±10%). Selection of the ±5% tolerance variant is appropriate for circuits with strict inductance requirements.

Mechanical and Electrical Compatibility: All three parts share identical package dimensions (1812/4532 Metric), height specifications, and electrical characteristics at test frequency (7.9-7.96 MHz). Direct PCB footprint compatibility is confirmed.

Frequently Asked Questions (FAQ)

Q: Can CM453232-4R7KL be used as a direct replacement for 1812-472K?

A: CM453232-4R7KL is mechanically and electrically compatible with 1812-472K for applications where circuit current does not exceed 315 mA. The substitute part matches all mandatory parameters including inductance (4.7 µH), package (1812), core material (ferrite), and DC resistance (1Ohm Max). However, the reduced current rating (315 mA vs. 448 mA) and narrower operating temperature range (-40°C vs. -55°C minimum) must be evaluated against circuit requirements.

Q: What is the difference between CM453232-4R7JL and CM453232-4R7KL?

A: Both parts are manufactured by Bourns Inc. and share identical electrical and mechanical specifications except for inductance tolerance. CM453232-4R7JL specifies ±5% tolerance, while CM453232-4R7KL specifies ±10% tolerance. Selection between these variants depends on circuit inductance tolerance requirements.

Q: Are the Bourns substitutes suitable for RoHS-compliant applications?

A: Yes. Both CM453232-4R7JL and CM453232-4R7KL are ROHS3 compliant, making them suitable for applications requiring RoHS compliance. The original 1812-472K is RoHS non-compliant.

Q: Do all three parts use the same PCB footprint?

A: Yes. The 1812-472K, CM453232-4R7JL, and CM453232-4R7KL all use the 1812 (4532 Metric) package with identical dimensions (0.177" L x 0.126" W / 4.50mm x 3.20mm) and height (0.134" / 3.40mm). PCB footprint compatibility is confirmed for all three parts.

Q: What is the primary limitation when substituting with Bourns parts?

A: The primary limitation is current rating. The Bourns substitutes are rated for 315 mA maximum continuous current, compared to 448 mA for the 1812-472K. Applications requiring current above 315 mA must use the original 1812-472K part.

Q: Can these parts be used in high-temperature applications below -40°C?

A: No. Both Bourns substitute parts (CM453232-4R7JL and CM453232-4R7KL) specify a minimum operating temperature of -40°C. For applications requiring operation at -55°C or lower, the 1812-472K is required.

Q: Are there any differences in Q factor between these parts?

A: The Q factor at test frequency is identical across all three parts: 50 @ 7.9-7.96 MHz. Self-resonant frequency is also identical at 35 MHz for all parts.