IMC1812RQ331K Equivalent & Substitute Parts

Part Overview

The IMC1812RQ331K is a 330 µH unshielded drum core wirewound inductor manufactured by Vishay Dale, rated for 85 mA maximum current with 14 Ohm DC resistance. This surface mount component in 1812 (4532 Metric) package is designed for applications requiring fixed inductance in compact form factors. The part is currently active in production. Substitute parts are identified to provide design flexibility, inventory alternatives, and compliance options for procurement and manufacturing workflows.

Key Parameters

Parameter	Value
Inductance	330 µH
Current Rating	85 mA
DC Resistance (DCR)	14 Ohm Max
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Core Type	Drum Core, Wirewound, Ferrite
Shielding	Unshielded
Operating Temperature Range	-55°C ~ 125°C (Main Part)

Substitute Part Grouping Explanation

Substitute parts for the IMC1812RQ331K are qualified based on the following electrical and mechanical parameters:

Inductance value: 330 µH (exact match required)
Current rating: 85 mA (exact match required)
DC resistance: 14 Ohm Max (exact match required)
Package / Case: 1812 (4532 Metric) (exact match required)
Mounting type: Surface Mount (exact match required)
Core type: Drum Core, Wirewound, Ferrite (exact match required)
Shielding: Unshielded (exact match required)

The identified substitutes CM453232-331JL and CM453232-331KL from Bourns Inc. meet all critical electrical and mechanical parameters. Variations in tolerance, operating temperature range, inductance test frequency, and compliance certifications are documented in the parameter comparison table below.

Parameter Comparison

Parameter	IMC1812RQ331K (Vishay Dale)	CM453232-331JL (Bourns Inc.)	CM453232-331KL (Bourns Inc.)
Inductance	330 µH	330 µH	330 µH
Tolerance	±10%	±5%	±10%
Current Rating (Amps)	85 mA	85 mA	85 mA
DC Resistance (DCR)	14 Ohm Max	14 Ohm Max	14 Ohm Max
Q @ Freq	40 @ 790kHz	40 @ 796kHz	40 @ 796kHz
Frequency - Self Resonant	4.6MHz	4.6MHz	4.6MHz
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Size / Dimension	0.177" L x 0.126" W (4.50mm x 3.20mm)	0.177" L x 0.126" W (4.50mm x 3.20mm)	0.177" L x 0.126" W (4.50mm x 3.20mm)
Height - Seated (Max)	0.134" (3.40mm)	0.134" (3.40mm)	0.134" (3.40mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both Bourns Inc. substitute parts CM453232-331JL and CM453232-331KL are functionally equivalent to the IMC1812RQ331K for applications requiring 330 µH inductance at 85 mA current rating in 1812 package format.

CM453232-331JL offers tighter inductance tolerance (±5% versus ±10%) and is supplied in Tape & Reel packaging. This part is ROHS3 compliant and REACH unaffected, providing regulatory advantages over the main part.

CM453232-331KL maintains ±10% inductance tolerance matching the main part and is available in Cut Tape and Digi-Reel® packaging options. This part is also ROHS3 compliant and REACH unaffected.

Both substitutes operate across -40°C to 125°C temperature range, which covers the upper portion of the main part's -55°C to 125°C range. Selection between substitutes depends on packaging requirements and tolerance specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can CM453232-331JL and CM453232-331KL be used interchangeably with IMC1812RQ331K?

A: Yes, both parts meet the critical electrical and mechanical specifications: 330 µH inductance, 85 mA current rating, 14 Ohm maximum DC resistance, and 1812 (4532 Metric) surface mount package. Differences in tolerance, temperature range, and compliance certifications must be evaluated against application requirements.

Q: What is the difference between CM453232-331JL and CM453232-331KL?

A: The primary differences are inductance tolerance (±5% for -331JL versus ±10% for -331KL) and packaging format (Tape & Reel for -331JL versus Cut Tape and Digi-Reel® for -331KL). Both parts share identical electrical performance at rated specifications and operating temperature range.

Q: Does the operating temperature difference affect substitution?

A: The main part operates from -55°C to 125°C, while both Bourns substitutes operate from -40°C to 125°C. Applications requiring operation below -40°C must use the original IMC1812RQ331K. For applications within -40°C to 125°C range, the substitutes are suitable.

Q: Are the Bourns parts RoHS compliant?

A: Yes, both CM453232-331JL and CM453232-331KL are ROHS3 compliant. The original IMC1812RQ331K is RoHS non-compliant. This is a significant advantage for designs requiring RoHS compliance.

Q: What packaging options are available?

A: IMC1812RQ331K is supplied in Tape & Reel (TR). CM453232-331JL is supplied in Tape & Reel (TR). CM453232-331KL is supplied in Cut Tape (CT) and Digi-Reel® formats. Packaging selection depends on assembly equipment and procurement workflow requirements.

Q: How do the inductance tolerances compare?

A: IMC1812RQ331K and CM453232-331KL both specify ±10% tolerance. CM453232-331JL specifies ±5% tolerance, providing tighter inductance accuracy. Applications with strict inductance requirements may benefit from the -331JL variant.

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