Würth Elektronik 744777003 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744777003 is a 3.3 µH shielded drum core wirewound inductor rated for 4.6 A continuous current with a maximum DC resistance of 30mOhm. This component is designed for surface mount applications in compact form factors and maintains active product status with full AEC-Q200 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within specified tolerance ranges for inductance, current rating, and physical dimensions.

Substiute Parts

744777003

Würth ElektronikIn Stock: 1708744777003 Datasheet

Current PartRFQ

P1167.362NL

Pulse ElectronicsIn Stock: 3570P1167.362NL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Würth Elektronik 744777003 is determined by the following critical parameters:

Inductance Range: The substitute part inductance must fall within the tolerance band of the main part. With a nominal 3.3 µH and ±20% tolerance, acceptable inductance values range from 2.64 µH to 3.96 µH.

Current Rating: The substitute must support the required continuous current of 4.6 A. Saturation current (Isat) must not fall below the application's peak current requirements.

DC Resistance: The substitute's DCR must not exceed 30mOhm to maintain equivalent power dissipation characteristics.

Shielding: Both the main part and substitute must provide electromagnetic shielding to prevent coupling with adjacent circuit elements.

Physical Compatibility: Surface mount package dimensions must accommodate the PCB footprint designed for the main part. Height and lateral dimensions are critical for board-level integration.

Environmental Compliance: RoHS3 compliance and MSL rating must match or exceed the main part specifications.

The Pulse Electronics P1167.362NL meets these substitution criteria within the specified parameter windows.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration - Current Rating: The Pulse Electronics P1167.362NL is rated for 3.1 A continuous current, which is 0.4 A lower than the Würth Elektronik 744777003 at 4.6 A. The saturation current (Isat) of 3.1 A on the substitute part equals its continuous rating, indicating limited headroom for transient current spikes. This substitution is valid only when the application's sustained current demand does not exceed 3.1 A and transient peaks remain below this threshold.

Secondary Consideration - Self Resonant Frequency: The substitute part exhibits a self-resonant frequency of 40 MHz compared to 55 MHz for the main part. In high-frequency applications or circuits sensitive to impedance characteristics above 40 MHz, this difference may affect circuit behavior. Verification against the specific frequency response requirements of the application is necessary.

Physical Fit - Package Dimensions: The substitute part measures 7.54mm x 7.54mm, which is 0.24mm larger in each lateral dimension than the main part's 7.30mm x 7.30mm footprint. Both maintain identical height of 4.50mm. PCB layout must accommodate this slight size increase to prevent mechanical interference.

Compliance and Availability: Both parts maintain active product status, ROHS3 compliance, and MSL 1 rating. The substitute offers a wider operating temperature range (-40°C to 130°C versus -40°C to 125°C) and lower DC resistance (20mOhm versus 30mOhm maximum), both favorable characteristics for thermal management and efficiency.

Frequently Asked Questions (FAQ)

Q: Can the Pulse Electronics P1167.362NL directly replace the Würth Elektronik 744777003 in all applications?

A: No. The substitute part has a lower continuous current rating (3.1 A versus 4.6 A) and lower saturation current. Substitution is valid only when the application's maximum sustained current does not exceed 3.1 A and transient peaks remain within this limit.

Q: What is the inductance tolerance impact of using the substitute part?

A: The Pulse Electronics part has ±30% tolerance compared to ±20% for the main part. At nominal 3.6 µH, the substitute's tolerance band is 2.52–4.68 µH, which overlaps the main part's tolerance band (2.64–3.96 µH). For applications requiring tighter inductance control, the main part's ±20% tolerance is preferable.

Q: Are there physical compatibility issues with the substitute part?

A: The substitute is 0.24mm larger in lateral dimensions (7.54mm versus 7.30mm). Verify that the PCB footprint and surrounding component placement accommodate this size difference. Height remains identical at 4.50mm maximum.

Q: How does the lower self-resonant frequency of the substitute affect circuit performance?

A: The substitute's 40 MHz SRF versus 55 MHz for the main part means the inductor transitions to capacitive behavior at a lower frequency. In circuits operating near or above 40 MHz, this may alter impedance characteristics. Verify the application's frequency response requirements before substitution.

Q: Are both parts equally available for long-term supply?

A: Both parts maintain active product status. The Pulse Electronics P1167.362NL shows higher inventory (3498 pcs versus 1650 pcs for the main part), suggesting potentially better long-term availability. Confirm with your supplier for production forecasts.

Q: What is the DC resistance advantage of the substitute part?

A: The Pulse Electronics part has a maximum DCR of 20mOhm compared to 30mOhm for the main part. Lower resistance reduces power dissipation and heat generation, which is beneficial for thermal management in current-limited applications.