Würth Elektronik 744902012 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744902012 is a 1.2 nH unshielded thin film inductor rated for 800 mA with a maximum DC resistance of 200mOhm in a 0603 (1608 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The WE-TCI series thin film inductors are designed for high-frequency applications requiring precise inductance values and low parasitic resistance.

Substiute Parts

744902012

Würth ElektronikIn Stock: 1036744902012 Datasheet

Current PartRFQ

744901012

Würth ElektronikIn Stock: 4880744901012 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 744902012 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance value: 1.2 nH (with ±0.1 nH tolerance maintained)
• Shielding type: Unshielded
• Operating temperature range: -40°C to 125°C minimum
• Series classification: WE-TCI thin film inductor family

Mechanical Compatibility Criteria:

• Mounting type: Surface mount
• Package classification: 0603 (1608 Metric) or smaller compatible footprint

Performance Considerations:

• Current rating must meet or exceed application requirements
• DC resistance must not exceed specified maximum for the application
• Self-resonant frequency and Q factor must support intended operating frequency

The substitute part 744901012 shares the same inductance value, tolerance, shielding type, temperature range, and series designation. However, it differs in package size (0402 vs. 0603), current rating (700 mA vs. 800 mA), and DC resistance (100 mOhm vs. 200 mOhm). These differences establish a conditional substitution relationship dependent on circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The 744901012 is an active product within the same WE-TCI series and maintains identical inductance specifications and tolerance. Both components are ROHS3 compliant with unlimited moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

Selection between these parts depends on circuit-specific requirements:

Choose 744902012 (if available from inventory): When the application requires the 0603 package footprint and can accommodate the 200 mOhm maximum DC resistance with a current demand up to 800 mA.

Choose 744901012: When the application permits the smaller 0402 package footprint, operates at or below 700 mA, and benefits from the lower 100 mOhm DC resistance. The reduced parasitic resistance may improve circuit efficiency in high-frequency applications.

Both components operate across the identical temperature range and maintain the same inductance value with equivalent tolerance specifications, supporting direct functional substitution within the stated electrical and mechanical constraints.

Frequently Asked Questions (FAQ)

Q: Can 744901012 directly replace 744902012 in all applications?

A: Direct replacement is conditional. The 744901012 is electrically compatible in inductance value and tolerance but differs in three critical parameters: package size (0402 vs. 0603), current rating (700 mA vs. 800 mA), and DC resistance (100 mOhm vs. 200 mOhm). Substitution is valid only when the application current does not exceed 700 mA and the PCB layout accommodates the smaller 0402 footprint.

Q: What is the impact of the different DC resistance values?

A: The 744901012 exhibits 50% lower DC resistance (100 mOhm vs. 200 mOhm). In high-current applications, lower resistance reduces parasitic power dissipation and heat generation. However, this difference is negligible in low-current or high-impedance circuits. Verify that the application current remains within the 700 mA limit of the substitute part.

Q: Are there package compatibility concerns?

A: Yes. The 744902012 uses a 0603 (1608 Metric) package, while the 744901012 uses a 0402 (1005 Metric) package. The 0402 is physically smaller and requires PCB layout modifications. Existing designs with 0603 footprints cannot accommodate the 0402 package without redesign. Conversely, 0402 footprints cannot accept the larger 0603 component.

Q: Do both parts meet the same compliance standards?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Both carry HTSUS code 8504.50.8000 and maintain identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: Why is 744902012 listed as obsolete?

A: The 744902012 is classified as obsolete by the manufacturer. The 744901012 is the active equivalent within the WE-TCI series. For new designs and production continuity, the 744901012 is the recommended selection when electrical and mechanical constraints permit its use.