Würth Elektronik 744902133 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744902133 is a 33 nH unshielded thin film inductor rated for 250 mA with a maximum DC resistance of 2 Ohm, packaged in 0603 (1608 Metric) surface mount format. This component is classified as obsolete product status. Due to its obsolete designation, equivalent substitute parts from Würth Elektronik's active product lines are necessary for new designs and ongoing procurement requirements.

Substiute Parts

744902133

Würth ElektronikIn Stock: 1163744902133 Datasheet

Current PartRFQ

744786133A

Würth ElektronikIn Stock: 4990744786133A Datasheet

DirectRFQ

744761133C

Würth ElektronikIn Stock: 4203744761133C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 744902133 is determined by the following critical parameters:

• Inductance Value: Must be 33 nH (exact match required)
• Package / Case: Must be 0603 (1608 Metric) surface mount
• Shielding Configuration: Must be unshielded
• Current Rating: Must meet or exceed 250 mA minimum requirement
• DC Resistance: Lower DCR values are acceptable as they represent improved performance
• Operating Temperature Range: Must support -40°C ~ 125°C minimum

Both substitute parts (744786133A and 744761133C) satisfy these core substitution criteria while offering enhanced electrical characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

744786133A (WE-MK Series, Multilayer)

This substitute provides 400 mA current rating with 700 mOhm maximum DCR. It maintains the same 1.5 GHz self-resonant frequency as the original part. Product status is active with ROHS3 compliance. This option is suitable for applications where the original 250 mA rating is adequate and cost optimization is a consideration.

744761133C (WE-KI Series, Drum Core Wirewound)

This substitute provides 600 mA current rating with 200 mOhm maximum DCR, representing significant improvement over the original 2 Ohm specification. The self-resonant frequency extends to 2.3 GHz with Q factor of 36 @ 250MHz. Product status is active with ROHS3 compliance. This option is recommended for applications requiring lower DC resistance and higher current capacity.

Both substitutes are active products with unlimited moisture sensitivity rating and full RoHS3 compliance, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can 744786133A or 744761133C be used as direct replacements for 744902133?

A: Yes. Both substitutes maintain the 33 nH inductance value, 0603 (1608 Metric) package, and unshielded configuration. Both exceed the original 250 mA current rating and provide lower DC resistance values, representing electrical improvements.

Q: What is the primary difference between the two substitute parts?

A: 744786133A is a multilayer inductor with 400 mA rating and 700 mOhm DCR. 744761133C is a drum core wirewound inductor with 600 mA rating and 200 mOhm DCR. The 744761133C offers superior current handling and significantly lower DC resistance.

Q: Are there packaging differences between these parts?

A: All three parts use 0603 (1608 Metric) surface mount packaging. Physical dimensions vary slightly: 744902133 and 744786133A are 0.063" L x 0.031" W, while 744761133C is 0.065" L x 0.045" W. Height differences are 0.022", 0.037", and 0.043" respectively.

Q: What is the significance of the obsolete status for 744902133?

A: Obsolete status indicates the part is no longer manufactured. Existing inventory may be available but future procurement cannot be guaranteed. Substitution to active products (744786133A or 744761133C) ensures design continuity and long-term supply chain reliability.

Q: Do all parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 with HTSUS code 8504.50.8000. All have MSL rating of 1 (unlimited moisture sensitivity).

Q: Which substitute should be selected for new designs?

A: Selection depends on application requirements. For standard current requirements, 744786133A provides cost-effective substitution. For applications requiring lower losses and higher current capacity, 744761133C is the preferred choice due to its 200 mOhm DCR and 600 mA rating.