IMC1812ES330K Equivalent & Substitute Parts

Part Overview

The IMC1812ES330K is a 33 µH unshielded drum core wirewound inductor manufactured by Vishay Dale, rated for 160 mA with a maximum DC resistance of 4Ω. This surface mount component in 1812 (4532 Metric) package is designed for applications requiring fixed inductance in compact form factors. The part maintains active product status and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are identified to provide design flexibility, supply chain alternatives, and equivalent electrical performance across multiple manufacturers while maintaining the same functional specifications and package footprint.

Key Parameters

Parameter	Value
Inductance	33 µH
Tolerance	±10%
Current Rating	160 mA
DC Resistance (Max)	4Ω
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Q @ Frequency	50 @ 2.52 MHz
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the IMC1812ES330K is determined by strict equivalence across the following parameters:

Inductance value: 33 µH (exact match required)
Tolerance: ±10% or tighter
Current rating: 160 mA minimum
DC resistance: 4Ω maximum
Package: 1812 (4532 Metric) surface mount
Shielding: Unshielded configuration
Q factor: 50 @ 2.52 MHz
Frequency test point: 2.52 MHz

All four substitute parts meet these core electrical and mechanical requirements. Variations in core material (iron powder vs. ferrite), self-resonant frequency, and operating temperature ranges are secondary parameters that do not prevent substitution when primary specifications align.

Parameter Comparison

Parameter	IMC1812ES330K (Vishay Dale)	3613C330K (TE Connectivity)	744766133 (Würth Elektronik)	CM453232-330JL (Bourns)	CM453232-330KL (Bourns)
Inductance	33 µH	33 µH	33 µH	33 µH	33 µH
Tolerance	±10%	±10%	±10%	±5%	±10%
Current Rating (mA)	160	160	160	160	160
DC Resistance (Max)	4Ω	4Ω	4Ω	4Ω	4Ω
Package / Case	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)	1812 (4532 Metric)
Q @ 2.52 MHz	50	50	50	50	50
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Self-Resonant Frequency	11 MHz	11 MHz	14 MHz	11 MHz	11 MHz
Operating Temperature	-55°C ~ 125°C	-30°C ~ 100°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All four substitute parts are active products with ROHS3 compliance and unlimited moisture sensitivity ratings, meeting regulatory requirements equivalent to the IMC1812ES330K.

CM453232-330JL offers the tightest inductance tolerance at ±5%, providing enhanced precision for applications requiring strict inductance control. This part maintains the full operating temperature range of -40°C ~ 125°C.

CM453232-330KL provides the highest inventory availability (25,400 units) with standard ±10% tolerance and identical operating temperature range to CM453232-330JL.

744766133 (Würth Elektronik) features the highest self-resonant frequency at 14 MHz, beneficial for high-frequency applications, though with a slightly reduced operating temperature maximum of 105°C.

3613C330K (TE Connectivity) operates within a narrower temperature range (-30°C ~ 100°C) and should be selected only when application requirements fall within these bounds.

Selection should prioritize parts matching the specific operating temperature and tolerance requirements of the target application, with all options providing equivalent electrical performance at the specified 2.52 MHz test frequency.

Frequently Asked Questions (FAQ)

Q: Can CM453232-330JL replace IMC1812ES330K in all applications?

A: CM453232-330JL meets all primary electrical specifications (33 µH, 160 mA, 4Ω DCR, 1812 package). The ±5% tolerance provides tighter inductance control than the ±10% specification. Operating temperature range (-40°C ~ 125°C) covers the IMC1812ES330K range. Substitution is valid for applications within these temperature bounds.

Q: What is the difference between the two Bourns parts (CM453232-330JL and CM453232-330KL)?

A: Both parts share identical electrical specifications and operating temperature range. The primary difference is inductance tolerance: CM453232-330JL specifies ±5% while CM453232-330KL specifies ±10%. CM453232-330KL has significantly higher inventory availability (25,400 vs. 4,601 units). Selection depends on tolerance requirements and supply chain needs.

Q: Does the 744766133 self-resonant frequency of 14 MHz affect substitution suitability?

A: The higher self-resonant frequency (14 MHz vs. 11 MHz) does not prevent substitution. Both values exceed the 2.52 MHz test frequency where Q factor equivalence is specified. The higher SRF may provide marginal benefits in high-frequency applications but does not compromise compatibility at standard operating frequencies.

Q: Is 3613C330K suitable for applications requiring -55°C operation?

A: No. The 3613C330K operating temperature range is -30°C ~ 100°C, which does not extend to -55°C. The IMC1812ES330K supports -55°C ~ 125°C. For applications requiring -55°C operation, select CM453232-330JL, CM453232-330KL, or 744766133.

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. All substitute parts are supplied in Tape & Reel (TR) packaging with 1812 (4532 Metric) supplier device package designation, matching the IMC1812ES330K packaging format.

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