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ELJ-FA470KF Equivalent & Substitute Parts
Part Overview
The ELJ-FA470KF is a 47 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 75 mA maximum current with 7Ω DC resistance in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | ELJ-FA470KF Value |
|---|---|
| Inductance | 47 µH |
| Tolerance | ±10% |
| Current Rating | 75 mA |
| DC Resistance (DCR) | 7Ω Max |
| Shielding | Unshielded |
| Package / Case | 1210 (3225 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature | -20°C ~ 85°C |
| Q @ Frequency | 30 @ 2.52MHz |
| Self Resonant Frequency | 15MHz |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Inductance value: 47 µH (exact match required)
- Inductance tolerance: ±10% or tighter
- Shielding type: Unshielded (must match)
- Mounting type: Surface Mount (must match)
- Package / Case: 1210 (3225 Metric) or equivalent footprint
- Current rating: Must equal or exceed 75 mA
- DC resistance: Must not exceed 7Ω maximum
Secondary Compatibility Factors:
- Operating temperature range must encompass or extend the original -20°C ~ 85°C specification
- Moisture sensitivity level 1 or 3 acceptable for unlimited or 168-hour environments
- RoHS and REACH compliance status noted for regulatory requirements
Substitute parts are grouped into two categories based on current rating capability and core material composition.
Parameter Comparison
| Part Number | Manufacturer | Inductance | Tolerance | Current Rating (mA) | DCR (Ω Max) | Package | Operating Temp (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| ELJ-FA470KF | Panasonic | 47 µH | ±10% | 75 | 7 | 1210 (3225 Metric) | -20 ~ 85 | Obsolete | Not specified |
| CM322522-470JL | Bourns Inc. | 47 µH | ±5% | 75 | 7 | Nonstandard | -40 ~ 125 | Active | ROHS3 Compliant |
| CM322522-470KL | Bourns Inc. | 47 µH | ±10% | 75 | 7 | Nonstandard | -40 ~ 125 | Active | ROHS3 Compliant |
| B82422A1473K100 | EPCOS - TDK Electronics | 47 µH | ±10% | 85 | 7 | 1210 (3225 Metric) | -55 ~ 125 | Active | ROHS3 Compliant |
| B82422T1473K000 | EPCOS - TDK Electronics | 47 µH | ±10% | 60 | 7 | 1210 (3225 Metric) | -55 ~ 125 | Active | ROHS3 Compliant |
| B82422H1473K000 | EPCOS - TDK Electronics | 47 µH | ±10% | 230 | 2.1 | 1210 (3225 Metric) | -55 ~ 150 | Active | ROHS3 Compliant |
| 1210R-473K | API Delevan Inc. | 47 µH | ±10% | 163 | 7 | 2-SMD | -55 ~ 125 | Active | ROHS3 Compliant |
| IMC1210ER470K | Vishay Dale | 47 µH | ±10% | 91 | 9 | 1210 (3225 Metric) | -55 ~ 125 | Active | ROHS3 Compliant |
| IMC1210EB470K | Vishay Dale | 47 µH | ±10% | 91 | 9 | 1210 (3225 Metric) | -55 ~ 125 | Active | ROHS3 Compliant |
| IMC1210BN470K | Vishay Dale | 47 µH | ±10% | 91 | 9 | 1210 (3225 Metric) | -55 ~ 125 | Active | RoHS non-compliant |
| IMC1210SY470K | Vishay Dale | 47 µH | ±10% | 91 | 9 | 1210 (3225 Metric) | -55 ~ 125 | Active | RoHS non-compliant |
Engineering Selection Recommendations
Direct Equivalents (Identical Electrical and Mechanical Specifications):
B82422A1473K100 and B82422T1473K000 from EPCOS - TDK Electronics maintain the 47 µH inductance, ±10% tolerance, 7Ω maximum DCR, and 1210 (3225 Metric) package footprint. Both are ROHS3 compliant and rated for extended operating temperature ranges (-55°C ~ 125°C). B82422A1473K100 provides 85 mA current rating, exceeding the original 75 mA specification. B82422T1473K000 operates at 60 mA, which falls below the 75 mA requirement and is not suitable for direct substitution.
Functional Equivalents (Meets Electrical Requirements with Package Considerations):
CM322522-470JL and CM322522-470KL from Bourns Inc. deliver identical electrical performance with 47 µH inductance, 75 mA current rating, and 7Ω DCR. Both are ROHS3 compliant with extended temperature ranges (-40°C ~ 125°C). The package designation is listed as nonstandard; physical dimensions (0.126" L x 0.098" W, 3.20mm x 2.50mm) match the 1210 footprint, but PCB layout verification is required prior to implementation.
Higher Current Capacity Alternatives:
1210R-473K (API Delevan Inc.) and IMC1210ER470K (Vishay Dale) provide 163 mA and 91 mA current ratings respectively, both exceeding the 75 mA requirement. 1210R-473K uses a 2-SMD package designation; IMC1210ER470K maintains the 1210 (3225 Metric) package. Both are ROHS3 compliant and suitable for applications requiring current margin.
Extended Performance Option:
B82422H1473K000 (EPCOS - TDK Electronics) offers 230 mA current rating and reduced DCR of 2.1Ω maximum, with operating temperature range extended to -55°C ~ 150°C. This part is ROHS3 compliant and suitable for high-current or thermally demanding applications, though the lower DCR represents a design change from the original specification.
Non-Compliant Alternatives:
IMC1210BN470K and IMC1210SY470K (Vishay Dale) are RoHS non-compliant and REACH affected. These parts are not recommended for new designs or regulated applications.
Frequently Asked Questions (FAQ)
Q: Can B82422T1473K000 replace ELJ-FA470KF?
A: No. B82422T1473K000 is rated for 60 mA maximum current, which is below the 75 mA requirement of ELJ-FA470KF. This part does not meet the minimum current specification.
Q: What is the difference between CM322522-470JL and CM322522-470KL?
A: Both parts are electrically identical with 47 µH inductance and 75 mA current rating. The primary difference is inductance tolerance: CM322522-470JL is ±5% while CM322522-470KL is ±10%. Packaging differs slightly in moisture sensitivity level (MSL 1 versus MSL 3). Both are physically compatible with the 1210 footprint.
Q: Are Vishay Dale IMC1210 series parts suitable substitutes?
A: IMC1210ER470K and IMC1210EB470K are suitable from an electrical standpoint, meeting the 47 µH inductance and exceeding the 75 mA current requirement. However, DCR is specified at 9Ω maximum, which exceeds the original 7Ω specification. This represents a 28.6% increase in resistance and may impact circuit performance in applications sensitive to inductor losses. IMC1210BN470K and IMC1210SY470K are not recommended due to RoHS non-compliance.
Q: Does package designation affect PCB compatibility?
A: Physical dimensions must be verified against PCB layout. CM322522-470JL and CM322522-470KL are listed as nonstandard package but have identical footprint dimensions (3.20mm x 2.50mm) to the 1210 standard. 1210R-473K uses a 2-SMD designation; dimensional compatibility should be confirmed with the manufacturer datasheet before implementation.
Q: Which substitute offers the best compliance profile?
A: B82422A1473K100 and B82422H1473K000 (EPCOS - TDK Electronics), CM322522-470JL and CM322522-470KL (Bourns Inc.), and 1210R-473K (API Delevan Inc.) are all ROHS3 compliant and REACH unaffected. These parts are suitable for regulated applications and new designs.
Q: Can I use B82422H1473K000 if my circuit requires lower DCR?
A: B82422H1473K000 provides 2.1Ω maximum DCR, which is significantly lower than the original 7Ω specification. This represents a design change that may alter circuit behavior, particularly in applications where inductor resistance contributes to damping or filtering characteristics. Circuit simulation or testing is necessary to confirm compatibility.
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