Equivalent & Substitute Parts for Würth Elektronik 74477010W

Part Overview

The Würth Elektronik 74477010W is a 10 µH shielded drum core wirewound inductor rated for 5.8 A continuous current with a maximum DC resistance of 27 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and is fully RoHS3 compliant.

Substiute Parts

74477010W

Würth ElektronikIn Stock: 76774477010W Datasheet

Current PartRFQ

74477010

Würth ElektronikIn Stock: 2098674477010 Datasheet

MFR RecommendedRFQ

P1172.103NLT

Pulse ElectronicsIn Stock: 9264P1172.103NLT Datasheet

DirectRFQ

P1173.103NLT

Pulse ElectronicsIn Stock: 892P1173.103NLT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74477010W is determined by the following critical parameters:

• Inductance Value: Must be 10 µH with ±20% tolerance
• Current Rating: Must support minimum 5.8 A continuous current
• Saturation Current: Must meet or exceed 6.6 A
• DC Resistance: Must not exceed 27 mOhm to maintain thermal and efficiency characteristics
• Shielding: Must be shielded to maintain electromagnetic compatibility
• Mounting Type: Must be surface mount compatible
• Operating Temperature: Must support -40°C to 125°C minimum
• Package Footprint: Physical dimensions must be compatible with 12.00 mm × 12.00 mm footprint

The substitute parts listed below meet these electrical and mechanical requirements and are classified as active products with current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

Würth Elektronik 74477010 (Recommended Primary Substitute)

The 74477010 is the direct manufacturer upgrade from the obsolete 74477010W. It maintains identical inductance, tolerance, and operating temperature specifications while offering improved current rating (6.2 A vs. 5.8 A) and reduced DC resistance (22 mOhm vs. 27 mOhm). This part is classified as active with AEC-Q200 automotive qualification and carries ROHS3 compliance. The identical footprint (12.00 mm × 12.00 mm) and reduced height (8.00 mm vs. 8.50 mm) ensure direct PCB compatibility. Tape & Reel packaging is available for production volumes.

Pulse Electronics P1172.103NLT and P1173.103NLT (Alternative Substitutes)

Both Pulse Electronics parts meet the core electrical requirements with 10 µH inductance and ±20% tolerance. The current rating of 5.2 A is lower than the original 5.8 A specification, making these suitable only for applications where the actual operating current does not exceed 5.2 A. DC resistance is superior at 21.8 mOhm. The extended operating temperature range (-40°C to 130°C) provides additional thermal margin. Footprint dimensions are slightly larger (12.24 mm × 12.24 mm) and require PCB layout verification. Both parts are active with ROHS3 compliance and MSL 1 rating.

For designs requiring the full 5.8 A current capability, the Würth Elektronik 74477010 is the appropriate selection. For applications with reduced current requirements, the Pulse Electronics alternatives offer lower DC resistance and extended temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 74477010 directly replace the 74477010W without PCB modifications?

A: The 74477010 maintains the same 12.00 mm × 12.00 mm footprint as the 74477010W. The reduced height (8.00 mm vs. 8.50 mm) is compatible with existing PCB layouts. No modifications are required for direct substitution.

Q: What is the significance of the current rating difference between the main part and substitute parts?

A: The 74477010W is rated for 5.8 A continuous current with 6.6 A saturation current. The Würth 74477010 exceeds this at 6.2 A continuous. The Pulse Electronics parts are rated for 5.2 A continuous with 5.5 A saturation. Selection must be based on actual circuit current requirements. If the design operates above 5.2 A, the Pulse parts are not suitable.

Q: Are the Pulse Electronics parts compatible with the same PCB layout?

A: The Pulse parts have a slightly larger footprint (12.24 mm × 12.24 mm vs. 12.00 mm × 12.00 mm). PCB layout verification is required to confirm clearance and trace routing compatibility before implementation.

Q: What does the ±20% inductance tolerance mean for circuit performance?

A: All listed parts share ±20% inductance tolerance. This means the actual inductance value may vary from 8 µH to 12 µH. Circuit designs must account for this tolerance range in filter response, impedance matching, or resonant frequency calculations.

Q: Why is the DC resistance specification important for inductor selection?

A: DC resistance directly affects power dissipation and thermal performance. Lower DC resistance reduces I²R losses. The 74477010 (22 mOhm) and Pulse parts (21.8 mOhm) offer improved efficiency compared to the original 27 mOhm specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 74477010, P1172.103NLT, and P1173.103NLT are all ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the environmental and regulatory requirements of the original part.

Q: What is the difference between the P1172.103NLT and P1173.103NLT?

A: Both parts are electrically identical with 10 µH inductance, 5.2 A current rating, and 21.8 mOhm DC resistance. They belong to different Pulse Electronics series (P1172NL vs. P1173NL). Selection between them depends on supplier availability and inventory status.