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Würth Elektronik 74458002 Equivalent & Substitute Parts
Part Overview
The Würth Elektronik 74458002 is a 2.2 µH unshielded drum core wirewound inductor rated for 7.1 A continuous current with a maximum DC resistance of 14 mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 2.2 µH |
| Inductance Tolerance | ±20% |
| Current Rating | 7.1 A |
| Saturation Current (Isat) | 20.3 A |
| DC Resistance (DCR) | 14 mOhm Max |
| Core Material | Ferrite |
| Shielding | Unshielded |
| Self Resonant Frequency | 42 MHz |
| Operating Temperature Range | -40°C to 125°C |
| Mounting Type | Surface Mount |
| Package Type | Nonstandard |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74458002 is determined by strict alignment of the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Inductance value: 2.2 µH (±20% tolerance band)
- Core type: Ferrite drum core, wirewound, unshielded
- Current rating: Equal to or greater than 7.1 A
- DC resistance: Equal to or lower than 14 mOhm maximum
- Operating temperature range: Minimum -40°C to 125°C coverage
- Mounting: Surface mount configuration
- Compliance: RoHS3 compliant, MSL 1 rating
The Bourns SDR1806-2R2ML meets all primary substitution criteria with improved electrical performance characteristics while maintaining mechanical and thermal compatibility.
Parameter Comparison
| Parameter | 74458002 (Würth Elektronik) | SDR1806-2R2ML (Bourns) | Compatibility |
|---|---|---|---|
| Inductance | 2.2 µH | 2.2 µH | Identical |
| Inductance Tolerance | ±20% | ±20% | Identical |
| Current Rating (Amps) | 7.1 A | 9 A | Substitute exceeds requirement |
| Saturation Current (Isat) | 20.3 A | 22 A | Substitute exceeds requirement |
| DC Resistance (DCR) | 14 mOhm Max | 6.8 mOhm Max | Substitute exceeds requirement |
| Core Material | Ferrite | Ferrite | Identical |
| Shielding | Unshielded | Unshielded | Identical |
| Self Resonant Frequency | 42 MHz | 55 MHz | Substitute exceeds requirement |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C | Identical |
| Mounting Type | Surface Mount | Surface Mount | Identical |
| Package Type | Nonstandard | Nonstandard | Identical |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Identical |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | Identical |
Engineering Selection Recommendations
The Bourns SDR1806-2R2ML is a qualified substitute for the Würth Elektronik 74458002 based on the following engineering criteria:
Electrical Performance: The substitute part maintains identical inductance and tolerance specifications while providing superior current handling capacity (9 A versus 7.1 A) and lower DC resistance (6.8 mOhm versus 14 mOhm maximum). The higher self-resonant frequency (55 MHz versus 42 MHz) extends the usable frequency range.
Compliance & Certification: Both parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity ratings, ensuring equivalent environmental and regulatory compatibility.
Thermal Compatibility: Identical operating temperature range (-40°C to 125°C) ensures thermal performance equivalence across all application conditions.
Mechanical Compatibility: Both components utilize identical surface mount packaging and nonstandard form factors, supporting direct board-level substitution without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can the SDR1806-2R2ML be used as a direct replacement for the 74458002?
A: Yes. The SDR1806-2R2ML meets all electrical and mechanical substitution criteria. The substitute part provides equal or superior performance across all specified parameters while maintaining identical compliance certifications and operating temperature range.
Q: What are the key differences between these parts?
A: The primary differences are current rating (9 A versus 7.1 A), DC resistance (6.8 mOhm versus 14 mOhm maximum), and self-resonant frequency (55 MHz versus 42 MHz). All differences favor the substitute part with improved electrical performance.
Q: Are there any package or mounting considerations?
A: Both parts use identical surface mount packaging and nonstandard form factors. Physical dimensions are comparable (18.54mm x 15.24mm x 7.11mm for the 74458002 versus 18.30mm x 14.00mm x 6.90mm for the SDR1806-2R2ML), supporting direct board-level substitution.
Q: Do both parts have the same moisture sensitivity rating?
A: Yes. Both the 74458002 and SDR1806-2R2ML carry MSL 1 (unlimited) ratings, indicating identical moisture handling requirements and storage conditions.
Q: What is the inductance tolerance for both parts?
A: Both parts are specified with ±20% inductance tolerance, measured at 100 kHz. This tolerance band is identical across both components.
Q: Are there any compliance or regulatory differences?
A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical EAR99 export classification and HTSUS coding (8504.50.4000).
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