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Würth Elektronik 7440420039 Equivalent & Substitute Parts
Part Overview
The Würth Elektronik 7440420039 is a 3.9 µH shielded drum core wirewound inductor rated for 1.82 A with a maximum DC resistance of 75mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is packaged in the 1919 (4848 Metric) form factor. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical and mechanical specifications are required for design flexibility, supply chain alternatives, or inventory management.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 3.9 µH |
| Inductance Tolerance | ±30% |
| Current Rating | 1.82 A |
| DC Resistance (Max) | 75mOhm |
| Core Type | Ferrite, Shielded Drum Core |
| Mounting Type | Surface Mount |
| Package / Case | 1919 (4848 Metric) |
| Operating Temperature Range | -40°C to 125°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the 7440420039 are qualified based on the following critical parameters:
- Inductance value: 3.9 µH with ±30% tolerance
- Current rating: 1.82 A minimum
- DC resistance: 75mOhm maximum
- Core material: Ferrite, shielded construction
- Package: 1919 (4848 Metric) surface mount form factor
- Operating temperature: -40°C to 125°C
- Compliance: ROHS3 and REACH requirements
The Bourns Inc. SRR4018-3R9Y meets all specified electrical and mechanical parameters within the allowed tolerances and certifications.
Parameter Comparison
| Parameter | Würth Elektronik 7440420039 | Bourns Inc. SRR4018-3R9Y |
|---|---|---|
| Inductance | 3.9 µH | 3.9 µH |
| Inductance Tolerance | ±30% | ±30% |
| Current Rating (Amps) | 1.82 A | 1.82 A |
| Current - Saturation (Isat) | 1.7 A | 1.65 A |
| DC Resistance (Max) | 75mOhm | 75mOhm |
| Core Type | Ferrite, Shielded Drum Core | Ferrite, Shielded Drum Core |
| Shielding | Shielded | Shielded |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 1919 (4848 Metric) | 1919 (4848 Metric) |
| Size / Dimension | 0.189" L x 0.189" W (4.80mm x 4.80mm) | 0.189" L x 0.189" W (4.80mm x 4.80mm) |
| Height - Seated (Max) | 0.079" (2.00mm) | 0.079" (2.00mm) |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C |
| Inductance Frequency - Test | 100 kHz | 100 kHz |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
Both the Würth Elektronik 7440420039 and Bourns Inc. SRR4018-3R9Y are active production components with identical ROHS3 and REACH compliance status. The parts are electrically and mechanically equivalent within the specified parameter tolerances. Selection between these parts is based on availability, supply chain requirements, and inventory status. Both components satisfy the electrical performance requirements for 3.9 µH inductance applications at 1.82 A current rating with 75mOhm maximum DC resistance in the 1919 (4848 Metric) package.
Frequently Asked Questions (FAQ)
Q: Can the Bourns SRR4018-3R9Y be used as a direct replacement for the Würth Elektronik 7440420039?
A: Yes. Both parts share identical inductance values, current ratings, DC resistance specifications, package dimensions, and operating temperature ranges. The parts are mechanically and electrically interchangeable within the specified parameter tolerances.
Q: Are there differences in saturation current between these parts?
A: The Würth Elektronik 7440420039 has an Isat of 1.7 A, while the Bourns SRR4018-3R9Y has an Isat of 1.65 A. Both values exceed the 1.82 A current rating specification, ensuring adequate performance margin in the application.
Q: Do both parts meet the same compliance requirements?
A: Yes. Both the 7440420039 and SRR4018-3R9Y are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings.
Q: Are the package dimensions identical?
A: Yes. Both parts are packaged in the 1919 (4848 Metric) form factor with dimensions of 0.189" L x 0.189" W (4.80mm x 4.80mm) and a maximum seated height of 0.079" (2.00mm).
Q: What is the inductance tolerance for both parts?
A: Both parts carry an inductance tolerance of ±30% at the 100 kHz test frequency.
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