Würth Elektronik 744824433 Common Mode Choke - Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744824433 is a 3.3 mH Common Mode Choke (CMC) designed for power line filtering applications. This through-hole mounted component operates at 4A maximum current with 35mOhm DC resistance and is rated for 250V AC operation across an operating temperature range of -40°C to 125°C. The part is Active status and ROHS3 compliant, making it suitable for contemporary electronic equipment requiring EMI suppression in two-line configurations.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while meeting the same functional requirements for power line filtering applications.

Key Parameters

Parameter	Value	Unit
Inductance @ 10 kHz	3.3	mH
Current Rating (Max)	4	A
DC Resistance (Max)	35	mOhm
Voltage Rating - AC	250	V
Number of Lines	2	—
Mounting Type	Through Hole	—
Operating Temperature Range	-40 to 125	°C
Package / Case	Vertical, 4 PC Pin	—

Substitute Part Grouping Explanation

Substitute parts for the 744824433 are classified based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

Inductance value at 10 kHz frequency
Current rating capability (must meet or exceed 4A minimum)
DC resistance within acceptable operating limits
AC voltage rating (minimum 250V)
Two-line common mode choke configuration
Through-hole mounting compatibility
Operating temperature range coverage (-40°C to 125°C minimum)
Package form factor (Vertical, 4 PC Pin)

Substitution Categories:

Category 1: Parametric Equivalent (Identical Inductance) Parts maintaining the exact 3.3 mH inductance value at 10 kHz with matching or superior electrical ratings qualify as direct parametric equivalents.

Category 2: Functional Equivalent (Lower Inductance) Parts with reduced inductance values (2.2 mH) may serve in applications where the lower filtering characteristic is acceptable, provided all other electrical and mechanical parameters remain compatible.

Parameter Comparison

Parameter	744824433 (Main)	744823422 (Würth)	C201370A-332NHF (ITG)
Manufacturer	Würth Elektronik	Würth Elektronik	ITG Electronics, Inc.
Inductance @ 10 kHz	3.3 mH	2.2 mH	3.3 mH
Current Rating (Max)	4 A	4 A	4.5 A
DC Resistance (Max)	35 mOhm	30 mOhm	35 mOhm
Voltage Rating - AC	250 V	250 V	250 V
Number of Lines	2	2	2
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	Vertical, 4 PC Pin	Vertical, 4 PC Pin	Vertical, 4 PC Pin
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Active	Active	Active
Size / Dimension	27.50 x 18.50 mm	24.60 x 13.00 mm	27.50 x 18.50 mm
Height (Max)	33.00 mm	25.50 mm	32.50 mm

Engineering Selection Recommendations

C201370A-332NHF (ITG Electronics, Inc.) - Direct Parametric Equivalent

This substitute maintains identical inductance (3.3 mH @ 10 kHz) and DC resistance (35 mOhm) specifications. The current rating is superior at 4.5A versus 4A, providing additional thermal margin. Physical dimensions and mounting configuration are identical to the main part. RoHS compliance is confirmed. This part is suitable for direct substitution in applications requiring the specified 3.3 mH inductance value.

744823422 (Würth Elektronik) - Functional Equivalent with Reduced Inductance

This substitute reduces inductance to 2.2 mH while maintaining the same current rating (4A) and voltage specifications. DC resistance is improved at 30 mOhm. Physical dimensions are smaller (24.60 x 13.00 mm vs. 27.50 x 18.50 mm), which may provide PCB layout advantages. ROHS3 compliance matches the main part. Selection of this part is appropriate only when the lower inductance value is compatible with the application's EMI filtering requirements.

Frequently Asked Questions (FAQ)

Q: Can the 744823422 be used as a direct replacement for the 744824433?

A: The 744823422 is a functional equivalent with reduced inductance (2.2 mH vs. 3.3 mH). Direct substitution is possible only if the application can tolerate the lower filtering characteristic. All other electrical parameters (current, voltage, temperature range) and mounting configuration are compatible.

Q: What is the primary difference between the C201370A-332NHF and the main part?

A: The C201370A-332NHF maintains identical inductance and DC resistance specifications. The primary differences are manufacturer (ITG Electronics vs. Würth Elektronik) and slightly superior current rating (4.5A vs. 4A). Physical dimensions and height are nearly identical.

Q: Are all substitute parts through-hole mounted?

A: Yes. All listed substitute parts use through-hole mounting with vertical, 4 PC pin package configuration, ensuring mechanical compatibility with existing PCB designs.

Q: Do the substitute parts meet the same temperature operating range?

A: Yes. All substitute parts operate across the -40°C to 125°C temperature range, matching the main part specification.

Q: What is the significance of the different physical dimensions for the 744823422?

A: The 744823422 has smaller footprint dimensions (24.60 x 13.00 mm vs. 27.50 x 18.50 mm) and lower height (25.50 mm vs. 33.00 mm). This may provide PCB layout flexibility in space-constrained applications, though the reduced inductance value must remain compatible with filtering requirements.

Q: Are all parts RoHS compliant?

A: Yes. The main part and 744823422 are ROHS3 compliant. The C201370A-332NHF is RoHS compliant. All parts meet environmental compliance requirements for contemporary electronic equipment.

Q: Can current rating differences affect part selection?

A: Current ratings represent maximum safe operating levels. The C201370A-332NHF (4.5A) and 744823422 (4A) both meet or exceed the main part's 4A requirement. Selection should be based on actual circuit current requirements and thermal design considerations.

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