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ELJ-FA100JF 10µH SMD Inductor Equivalent & Substitute Parts
Part Overview
The Panasonic ELJ-FA100JF is a 10µH unshielded wirewound inductor rated for 140mA with 2.1Ohm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain the same inductance value, tolerance, current rating capability, and package footprint to ensure direct compatibility in existing circuit designs.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 10 µH |
| Tolerance | ±5% |
| Current Rating | 140 mA |
| DC Resistance (DCR) | 2.1 Ohm Max |
| Package / Case | 1210 (3225 Metric) |
| Mounting Type | Surface Mount |
| Operating Temperature | -20°C ~ 85°C |
| Shielding | Unshielded |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Inductance: 10µH ±5% tolerance
- DC Resistance: 2.1 Ohm maximum
- Current Rating: Minimum 140mA
- Package: 1210 (3225 Metric) surface mount
- Shielding: Unshielded configuration
Secondary Compatibility Factors:
- Operating temperature range must encompass or exceed the original -20°C to 85°C specification
- Frequency characteristics (Q factor, self-resonant frequency) must be within acceptable ranges for the application
- Moisture sensitivity level and compliance certifications affect suitability for specific environments
Parts are grouped into two categories: Direct Equivalents (matching all primary criteria with identical current ratings) and Enhanced Substitutes (exceeding current rating or offering improved compliance certifications while maintaining electrical compatibility).
Parameter Comparison
| Part Number | Manufacturer | Inductance | Tolerance | Current Rating (mA) | DCR (Ohm Max) | Package | Operating Temp | Product Status |
|---|---|---|---|---|---|---|---|---|
| ELJ-FA100JF | Panasonic | 10 µH | ±5% | 140 | 2.1 | 1210 (3225) | -20°C ~ 85°C | Obsolete |
| 1210R-103J | API Delevan | 10 µH | ±5% | 297 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| B82422A1103J100 | EPCOS - TDK | 10 µH | ±5% | 180 | 1.6 | 1210 (3225) | -55°C ~ 125°C | Active |
| B82422T1103J000 | EPCOS - TDK | 10 µH | ±5% | 150 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| CM322522-100JL | Bourns | 10 µH | ±5% | 140 | 2.1 | Nonstandard | -40°C ~ 125°C | Active |
| IMC1210BN100J | Vishay Dale | 10 µH | ±5% | 189 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| IMC1210EB100J | Vishay Dale | 10 µH | ±5% | 189 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| IMC1210ER100J | Vishay Dale | 10 µH | ±5% | 189 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| IMC1210RM100J | Vishay Dale | 10 µH | ±5% | 189 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| IMC1210SY100J | Vishay Dale | 10 µH | ±5% | 189 | 2.1 | 1210 (3225) | -55°C ~ 125°C | Active |
| NLV32T-100J-EF | TDK | 10 µH | ±5% | 150 | 2.1 | 1210 (3225) | -40°C ~ 105°C | Active |
Engineering Selection Recommendations
Tier 1 - Direct Electrical & Mechanical Equivalents:
B82422T1103J000 and NLV32T-100J-EF are the primary substitutes. Both maintain 10µH inductance, ±5% tolerance, 2.1 Ohm DCR, and 1210 package specifications. B82422T1103J000 carries AEC-Q200 automotive qualification and ROHS3 compliance. NLV32T-100J-EF offers higher inventory availability (21,100 pcs) with ROHS3 compliance. Both support extended operating temperature ranges (-55°C to 125°C and -40°C to 105°C respectively), exceeding the original -20°C to 85°C specification.
Tier 2 - Enhanced Current Rating Substitutes:
IMC1210ER100J, IMC1210EB100J, IMC1210RM100J, and IMC1210SY100J (Vishay Dale IMC-1210 series) provide 189mA current rating with identical 2.1 Ohm DCR and 1210 package. These parts exceed the 140mA requirement while maintaining electrical compatibility. IMC1210ER100J and IMC1210EB100J carry ROHS3 compliance. All support -55°C to 125°C operating range.
Tier 3 - Superior Current Margin:
1210R-103J (API Delevan) delivers 297mA current rating with 2.1 Ohm DCR in 1210 package, providing maximum current headroom. Operating range extends to -55°C to 125°C with ROHS3 compliance.
Tier 4 - Package Consideration:
CM322522-100JL (Bourns) matches electrical specifications exactly (140mA, 2.1 Ohm DCR, 10µH) but uses a nonstandard package. This part is suitable only if PCB layout accommodates the nonstandard footprint. ROHS3 compliant with -40°C to 125°C operating range.
Tier 5 - Lower DCR Alternative:
B82422A1103J100 (EPCOS - TDK) offers reduced 1.6 Ohm DCR with 180mA current rating, reducing power dissipation. AEC-Q200 rated and ROHS3 compliant. Suitable for applications prioritizing thermal performance.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with higher current rating than the original 140mA specification?
A: Yes. Parts with higher current ratings (189mA, 297mA) are electrically compatible substitutes. Higher current ratings indicate greater saturation margin and do not negatively affect circuit operation. The inductor will perform identically at the original 140mA operating point.
Q: What is the significance of DCR (DC Resistance) in inductor substitution?
A: DCR directly affects power dissipation and thermal performance. The ELJ-FA100JF specifies 2.1 Ohm maximum DCR. Substitutes with equal or lower DCR (such as B82422A1103J100 at 1.6 Ohm) reduce resistive losses. Substitutes must not exceed 2.1 Ohm to maintain equivalent thermal characteristics.
Q: Are the Vishay Dale IMC-1210 variants (ER, EB, RM, SY) interchangeable?
A: Yes. IMC1210ER100J, IMC1210EB100J, IMC1210RM100J, and IMC1210SY100J are electrically identical with 189mA rating, 2.1 Ohm DCR, and 1210 package. Differences are in packaging format (Tape & Reel vs. Bulk) and compliance certifications. ER and EB variants carry ROHS3 compliance; RM and SY do not.
Q: Why does CM322522-100JL have a "nonstandard" package designation?
A: CM322522-100JL maintains the 1210 (3225 Metric) footprint dimensions but uses a different package classification. This indicates potential variations in lead configuration or mounting characteristics. Verify PCB design compatibility before selection.
Q: What is the difference between ferrite and iron powder core materials in these substitutes?
A: Core material affects frequency response and Q factor characteristics. The original ELJ-FA100JF uses wirewound construction. Substitutes employ ferrite cores (API Delevan, EPCOS, TDK) or iron powder cores (Vishay Dale). All maintain the specified 10µH inductance and electrical parameters. Core material selection does not affect substitution eligibility when electrical specifications match.
Q: Should I prioritize ROHS3 compliance when selecting a substitute?
A: ROHS3 compliance is a regulatory requirement for many applications and markets. Among active substitutes, B82422T1103J000, B82422A1103J100, IMC1210EB100J, IMC1210ER100J, 1210R-103J, and NLV32T-100J-EF carry ROHS3 certification. Selection depends on your application's regulatory requirements.
Q: Is the extended operating temperature range of substitutes (-55°C to 125°C) beneficial?
A: Extended temperature range provides design margin for applications operating outside the original -20°C to 85°C specification. This is advantageous for industrial, automotive, and aerospace applications. For consumer applications within the original range, extended temperature capability does not affect performance.
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