Würth Elektronik 744778930 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744778930 is a 1 mH shielded drum core wirewound inductor rated for 200 mA maximum current with 9.44Ohm maximum DC resistance. This component is part of the WE-PD Robust series and maintains active product status with full RoHS3 compliance. Equivalent and substitute parts are identified when they maintain the same inductance value, core shielding characteristics, and operating temperature range while accommodating variations in current rating and DC resistance within acceptable design margins.

Substiute Parts

744778930

Würth ElektronikIn Stock: 3432744778930 Datasheet

Current PartRFQ

SRR7032-102M

Bourns Inc.In Stock: 12286SRR7032-102M Datasheet

DirectRFQ

46105C

Murata Power Solutions Inc.In Stock: 255346105C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 744778930 are qualified based on the following critical parameters:

• Inductance Value: All substitutes must maintain 1 mH ±20% tolerance
• Shielding: All substitutes must be shielded to maintain electromagnetic isolation
• Operating Temperature: All substitutes must support -40°C to 125°C range
• Mounting Type: All substitutes must be surface mount compatible
• Compliance: All substitutes must maintain RoHS3 compliance and MSL 1 rating
• Current Handling: Substitutes may vary in current rating and saturation current based on application requirements
• DC Resistance: Substitutes may vary in DC resistance; selection depends on power dissipation constraints

The identified substitutes meet these core criteria while offering different current ratings and resistance characteristics to accommodate various circuit design requirements.

Parameter Comparison

Engineering Selection Recommendations

Würth Elektronik 744778930: Primary choice for applications requiring 200 mA current rating with AEC-Q200 automotive qualification. Suitable for standard industrial and automotive inductance filtering applications.

Bourns SRR7032-102M: Applicable in designs where current requirements do not exceed 150 mA. Offers lower DC resistance (5.4Ohm) compared to the primary part, reducing power dissipation. Slightly smaller footprint (7.00mm x 7.00mm) and lower profile (3.40mm) may provide layout advantages in space-constrained applications.

Murata 46105C: Suitable for applications requiring higher current capacity up to 270 mA. Provides the lowest DC resistance (4.9Ohm) among the three options, minimizing resistive losses. Taller profile (4.55mm) requires verification against PCB assembly height constraints. Recommended for manufacturer-specified applications where higher current handling is required.

All three parts maintain identical inductance values, shielding characteristics, operating temperature ranges, and compliance certifications, ensuring functional equivalence within their respective current ratings.

Frequently Asked Questions (FAQ)

Q: Can the SRR7032-102M substitute for the 744778930 in all applications?

A: The SRR7032-102M is suitable only for applications where the circuit current does not exceed 150 mA. If the design requires 200 mA operation, the saturation current of 140 mA in the Bourns part may be insufficient. Verify actual circuit current requirements before substitution.

Q: What is the primary difference between these three inductors?

A: The three parts differ in current rating and DC resistance. The 744778930 provides 200 mA at 9.44Ohm, the SRR7032-102M provides 150 mA at 5.4Ohm, and the 46105C provides 270 mA at 4.9Ohm. Selection depends on circuit current requirements and acceptable power dissipation levels.

Q: Are there physical compatibility concerns when substituting these parts?

A: The 744778930 and 46105C share identical footprint dimensions (7.30mm x 7.30mm), while the SRR7032-102M is slightly smaller (7.00mm x 7.00mm). Height differences exist: 744778930 at 4.60mm, SRR7032-102M at 3.40mm, and 46105C at 4.55mm. Verify PCB assembly height clearances, particularly for the Murata part.

Q: Do all three parts meet the same compliance standards?

A: Yes. All three inductors are RoHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and maintain REACH Unaffected status. The 744778930 includes AEC-Q200 automotive qualification; the other two parts do not specify this rating.

Q: Which part should be selected for lowest power dissipation?

A: The 46105C offers the lowest DC resistance at 4.9Ohm maximum, followed by the SRR7032-102M at 5.4Ohm. Selection must balance resistance with current rating requirements to ensure the part operates within its saturation current limits.