Würth Elektronik 744771003 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744771003 is a 4.6 µH shielded drum core wirewound inductor rated for 9.25 A continuous current with a maximum DC resistance of 8 mOhm. This component is classified as Active product status and is AEC-Q200 rated, making it suitable for automotive and industrial applications. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements where alternative electrical or mechanical parameters fall within acceptable tolerance ranges.

Key Parameters

Parameter	Value
Inductance	4.6 µH
Current Rating	9.25 A
DC Resistance (Max)	8 mOhm
Saturation Current	9 A
Shielding	Shielded
Core Type	Drum Core, Wirewound
Core Material	Ferrite
Operating Temperature Range	-40°C to 125°C
Self Resonant Frequency	40 MHz
Mounting Type	Surface Mount
Package	Nonstandard (12.00mm x 12.00mm x 6.00mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 744771003 are qualified based on the following critical parameters:

Inductance Range: Substitute inductance values must fall within ±20% tolerance of the primary specification (4.6 µH nominal). This allows for parts with inductance between 2.8 µH and 4.2 µH.

Current Rating: Substitute parts must maintain a minimum continuous current rating of 8.3 A to ensure adequate thermal and electrical performance margins.

DC Resistance: Maximum DC resistance for substitutes is limited to 12 mOhm to preserve circuit efficiency and thermal characteristics.

Shielding: All substitutes must be shielded to maintain electromagnetic compatibility and prevent interference in the target application.

Mounting and Package: All substitutes must be surface mount components with nonstandard package dimensions compatible with 12.00mm x 12.00mm footprints and heights between 6.00mm and 6.50mm.

Environmental Compliance: All substitutes must maintain ROHS3 compliance, MSL 1 rating, and operating temperature ranges suitable for -40°C to 125°C environments.

Parameter Comparison

Parameter	744771003 (Würth)	P1170.302NLT (Pulse)	SRR1260-3R3Y (Bourns)
Inductance	4.6 µH	3 µH	3.3 µH
Inductance Tolerance	±20%	±30%	±30%
Current Rating (Amps)	9.25 A	8.3 A	7.6 A
Saturation Current	9 A	8.3 A	7.8 A
DC Resistance (Max)	8 mOhm	7.7 mOhm	12 mOhm
Shielding	Shielded	Shielded	Shielded
Core Type	Drum Core, Wirewound	Wirewound	Drum Core, Wirewound
Self Resonant Frequency	40 MHz	38 MHz	40 MHz
Operating Temperature	-40°C to 125°C	-40°C to 130°C	-40°C to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package Dimensions (L x W)	12.00mm x 12.00mm	12.24mm x 12.24mm	12.50mm x 12.50mm
Height (Max)	6.00mm	6.00mm	6.50mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity	MSL 1	MSL 1	MSL 1
Product Status	Active	Active	Active

Engineering Selection Recommendations

P1170.302NLT (Pulse Electronics): This substitute offers the lowest DC resistance at 7.7 mOhm, which is superior to the primary part. The inductance of 3 µH is within acceptable substitution range. However, the current rating of 8.3 A represents a 10% reduction from the primary specification. This part is suitable for applications where lower resistance is beneficial and current requirements do not exceed 8.3 A. The extended operating temperature range to 130°C provides additional thermal margin. Package dimensions are slightly larger (12.24mm x 12.24mm) but remain compatible with standard 12mm footprints.

SRR1260-3R3Y (Bourns Inc.): This substitute maintains inductance at 3.3 µH, which is within acceptable range. The current rating of 7.6 A represents a 18% reduction from the primary specification, making this part suitable only for applications with lower current demands. The DC resistance of 12 mOhm is at the upper limit of acceptable substitution parameters. The package dimensions are the largest at 12.50mm x 12.50mm with a height of 6.50mm, requiring verification of PCB layout clearance. This part maintains AEC-Q200 equivalent performance through ferrite drum core construction and 40 MHz self-resonant frequency matching.

Both substitute parts maintain full ROHS3 compliance, MSL 1 moisture sensitivity rating, and Active product status. Selection between substitutes depends on specific application current requirements and available PCB layout space.

Frequently Asked Questions (FAQ)

Q: Can the P1170.302NLT be used as a direct replacement for the 744771003?

A: The P1170.302NLT is electrically compatible within defined parameters. The 3 µH inductance falls within acceptable substitution range, and the 8.3 A current rating is suitable for applications not exceeding this limit. The lower DC resistance of 7.7 mOhm is advantageous. Package dimensions are slightly larger (12.24mm x 12.24mm) and must be verified against PCB layout constraints.

Q: What are the current rating limitations when using substitute parts?

A: The primary part 744771003 is rated for 9.25 A. The P1170.302NLT substitute is rated for 8.3 A, and the SRR1260-3R3Y is rated for 7.6 A. Applications requiring continuous current above 8.3 A should use the primary part or P1170.302NLT. Applications with current demands above 7.6 A should avoid the SRR1260-3R3Y.

Q: Are there temperature range differences between the primary part and substitutes?

A: The primary part operates from -40°C to 125°C. The P1170.302NLT extends to 130°C, providing additional thermal margin. The SRR1260-3R3Y matches the primary specification at -40°C to 125°C. All parts are suitable for standard industrial and automotive temperature ranges.

Q: How do inductance tolerances affect substitution?

A: The primary part specifies ±20% tolerance (2.8 µH to 4.2 µH). Substitutes P1170.302NLT and SRR1260-3R3Y specify ±30% tolerance, which is wider. Both substitute inductance values (3 µH and 3.3 µH respectively) fall within the primary part's tolerance band, ensuring functional compatibility.

Q: What are the DC resistance implications for circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. The P1170.302NLT at 7.7 mOhm provides superior efficiency compared to the primary part at 8 mOhm. The SRR1260-3R3Y at 12 mOhm represents a 50% increase in resistance and should be evaluated for thermal impact in high-current applications.

Q: Are package dimension differences critical for PCB layout?

A: The primary part is 12.00mm x 12.00mm x 6.00mm. The P1170.302NLT is 12.24mm x 12.24mm x 6.00mm, and the SRR1260-3R3Y is 12.50mm x 12.50mm x 6.50mm. All dimensions are within nonstandard package category. PCB layout must accommodate the larger footprints of substitute parts, particularly the SRR1260-3R3Y.

Q: Do all parts maintain equivalent shielding performance?

A: All three parts are specified as shielded inductors. The primary part and SRR1260-3R3Y are drum core wirewound with ferrite cores. The P1170.302NLT is wirewound with unspecified core material. All maintain self-resonant frequencies between 38 MHz and 40 MHz, indicating equivalent high-frequency performance and shielding effectiveness.

Q: What compliance certifications apply to substitute parts?

A: All parts maintain ROHS3 compliance, MSL 1 moisture sensitivity rating, and REACH unaffected status. The primary part carries AEC-Q200 rating. Substitute parts maintain equivalent environmental and regulatory compliance suitable for automotive and industrial applications.

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