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Bourns 1140-101K Equivalent & Substitute Parts
Part Overview
The Bourns 1140-101K is a 100 µH unshielded drum core wirewound inductor rated for 14.4 A continuous current with 25 mOhm maximum DC resistance. This through-hole component operates across the temperature range of -55°C to 105°C and is designed for radial vertical cylinder mounting. The part is currently listed as obsolete, making identification of suitable alternatives necessary for ongoing design support and procurement planning.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 100 µH |
| Inductance Tolerance | ±10% |
| Current Rating | 14.4 A |
| DC Resistance (Max) | 25 mOhm |
| Core Material | Ferrite |
| Shielding | Unshielded |
| Operating Temperature Range | -55°C to 105°C |
| Mounting Type | Through Hole |
| Package Type | Radial, Vertical Cylinder |
| Physical Diameter | 1.500" (38.10 mm) |
| Physical Height | 1.030" (26.16 mm) |
| Inductance Test Frequency | 1 kHz |
Substitute Part Grouping Explanation
Substitution eligibility for the 1140-101K is determined by strict equivalence across the following critical parameters:
Mandatory Matching Parameters:
- Inductance value: 100 µH
- Inductance tolerance: ±10%
- DC resistance: 25 mOhm maximum
- Core material: Ferrite
- Shielding configuration: Unshielded
- Mounting type: Through hole
- Package type: Radial, vertical cylinder
- Physical dimensions: 1.500" diameter, 1.030" height maximum
- Operating temperature range: -55°C to 105°C
- Test frequency: 1 kHz
Allowable Variation:
- Current rating may be lower than the original 14.4 A specification, provided the substitute meets the application's actual current requirements and does not exceed saturation current limits.
The 1140-101K-RC meets all mandatory matching parameters and qualifies as a direct substitute.
Parameter Comparison
| Parameter | 1140-101K (Original) | 1140-101K-RC (Substitute) |
|---|---|---|
| Manufacturer | Bourns Inc. | Bourns Inc. |
| Series | 1140 | 1140 |
| Inductance | 100 µH | 100 µH |
| Inductance Tolerance | ±10% | ±10% |
| Current Rating | 14.4 A | 10.5 A |
| Current - Saturation | Not specified | 20.6 A |
| DC Resistance (Max) | 25 mOhm | 25 mOhm |
| Core Material | Ferrite | Ferrite |
| Shielding | Unshielded | Unshielded |
| Operating Temperature | -55°C to 105°C | -55°C to 105°C |
| Mounting Type | Through Hole | Through Hole |
| Package Type | Radial, Vertical Cylinder | Radial, Vertical Cylinder |
| Physical Diameter | 1.500" (38.10 mm) | 1.500" (38.10 mm) |
| Physical Height | 1.030" (26.16 mm) | 1.030" (26.16 mm) |
| Inductance Test Frequency | 1 kHz | 1 kHz |
| Product Status | Obsolete | Active |
| RoHS Status | Non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The 1140-101K-RC is the qualified substitute for the obsolete 1140-101K. Both parts share identical inductance, tolerance, DC resistance, core material, shielding, temperature range, and physical dimensions. The primary differences are:
Current Rating Consideration: The substitute is rated for 10.5 A continuous current versus the original 14.4 A. The substitute provides a saturation current specification of 20.6 A. Selection of the 1140-101K-RC is appropriate when the application's actual operating current does not exceed 10.5 A continuous. For applications requiring the full 14.4 A rating, alternative inductors from the 1140 series or other manufacturers must be evaluated.
Compliance Status: The 1140-101K-RC is ROHS3 compliant, whereas the original part is non-compliant. For new designs or procurement requiring regulatory compliance, the substitute is the preferred choice.
Availability: The 1140-101K-RC is in active production with confirmed inventory availability, whereas the original part is obsolete.
Frequently Asked Questions (FAQ)
Q: Can the 1140-101K-RC be used as a direct replacement in existing designs?
A: The 1140-101K-RC is mechanically and electrically compatible with the 1140-101K for applications where continuous current does not exceed 10.5 A. Verify that your circuit's actual operating current is within this limit. Both parts have identical inductance, tolerance, DC resistance, physical dimensions, and operating temperature range.
Q: What is the difference in current rating between the two parts?
A: The original 1140-101K is rated for 14.4 A continuous current. The substitute 1140-101K-RC is rated for 10.5 A continuous current but has a saturation current of 20.6 A. If your application requires sustained current above 10.5 A, the substitute is not suitable.
Q: Are the physical dimensions identical?
A: Yes. Both parts have a 1.500" (38.10 mm) diameter and 1.030" (26.16 mm) maximum seated height. They are both radial, vertical cylinder through-hole components and will fit the same PCB footprint.
Q: What is the compliance difference?
A: The 1140-101K is RoHS non-compliant. The 1140-101K-RC is ROHS3 compliant. For applications subject to RoHS regulations, the substitute is required.
Q: Are the inductance and tolerance specifications the same?
A: Yes. Both parts are 100 µH with ±10% tolerance, tested at 1 kHz. The DC resistance maximum is also identical at 25 mOhm.
Q: What packaging is available for the substitute?
A: The 1140-101K-RC is supplied in bulk packaging.
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