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74F565AI-RC Equivalent & Substitute Parts
Part Overview
The 74F565AI-RC is a 56 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 300 mA with a maximum DC resistance of 3.75 Ohm. This component is designed for through-hole axial mounting applications requiring fixed inductance in the 56 µH range. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 56 µH |
| Current Rating | 300 mA |
| DC Resistance (DCR) | 3.75 Ohm Max |
| Tolerance | ±10% |
| Operating Temperature Range | -55°C ~ 105°C |
| Mounting Type | Through Hole Axial |
| Shielding | Unshielded |
| Core Material | Iron |
Substitute Part Grouping Explanation
Substitution eligibility for the 74F565AI-RC is determined by the following critical parameters:
- Inductance Value: Must be 56 µH (exact match required)
- Current Rating: Substitute must support minimum 300 mA; lower ratings are not acceptable
- DC Resistance: Must not exceed 3.75 Ohm to maintain circuit performance
- Mounting Configuration: Through-hole axial package required
- Core Type: Iron core construction
- Shielding: Unshielded configuration
The 1945R-17J meets these substitution criteria with compatible electrical characteristics and active product status.
Parameter Comparison
| Parameter | 74F565AI-RC (Bourns) | 1945R-17J (API Delevan) | Compatibility |
|---|---|---|---|
| Inductance | 56 µH | 56 µH | Match |
| Current Rating (Amps) | 300 mA | 265 mA | Substitute rated lower; verify circuit requirements |
| DC Resistance (DCR) | 3.75 Ohm Max | 3.99 Ohm | Substitute within acceptable range |
| Tolerance | ±10% | ±5% | Substitute tighter tolerance |
| Operating Temperature | -55°C ~ 105°C | -55°C ~ 125°C | Substitute wider range |
| Mounting Type | Through Hole Axial | Through Hole Axial | Match |
| Shielding | Unshielded | Unshielded | Match |
| Core Material | Iron | Iron | Match |
| Q @ Frequency | 90 @ 2.52 MHz | 75 @ 2.5 MHz | Main part higher Q factor |
| Self Resonant Frequency | 18 MHz | 15.2 MHz | Main part higher SRF |
| Product Status | Obsolete | Active | Substitute actively manufactured |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Match |
Engineering Selection Recommendations
The 1945R-17J from API Delevan Inc. serves as a functional equivalent for the obsolete 74F565AI-RC. Both components share identical inductance values, core materials, and mounting configurations. The substitute offers active product status with ongoing manufacturing support, addressing the obsolescence constraint of the original part.
Key considerations for selection:
- Current Rating Differential: The 1945R-17J is rated for 265 mA versus the 74F565AI-RC's 300 mA. Circuit designs operating at or near 300 mA maximum current must be evaluated against the substitute's lower rating.
- DC Resistance: The substitute's 3.99 Ohm DCR is marginally higher than the original's 3.75 Ohm maximum, resulting in increased power dissipation. This difference is within typical engineering tolerance for most applications.
- Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.
- Temperature Range: The substitute supports an extended operating temperature range (-55°C to 125°C versus -55°C to 105°C), providing additional thermal margin.
Frequently Asked Questions (FAQ)
Q: Can the 1945R-17J directly replace the 74F565AI-RC in all applications?
A: Direct replacement is possible for applications where circuit current does not exceed 265 mA. Designs requiring the full 300 mA rating of the original part require current derating analysis or alternative sourcing.
Q: What is the impact of the higher DC resistance in the substitute?
A: The 1945R-17J's 3.99 Ohm DCR versus the 74F565AI-RC's 3.75 Ohm maximum results in approximately 6.4% additional resistive loss. For low-power signal applications, this difference is typically negligible. High-current or precision applications should calculate power dissipation impact.
Q: Are there package dimension differences between these parts?
A: Yes. The 74F565AI-RC measures 0.200" diameter × 0.500" length (5.08mm × 12.70mm), while the 1945R-17J measures 0.193" diameter × 0.447" length (4.90mm × 11.35mm). Both are through-hole axial packages; verify PCB layout compatibility before substitution.
Q: What is the significance of the Q factor difference?
A: The 74F565AI-RC exhibits Q of 90 @ 2.52 MHz compared to the 1945R-17J's Q of 75 @ 2.5 MHz. The original part demonstrates higher quality factor, indicating lower losses at the test frequency. For RF or high-frequency applications, this difference may be significant.
Q: Are both parts RoHS compliant?
A: Yes. Both the 74F565AI-RC and 1945R-17J are ROHS3 compliant with REACH unaffected status, ensuring compatibility with current environmental regulations.
Q: What packaging format is the substitute available in?
A: The 1945R-17J is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Verify tape specifications and reel quantities against procurement requirements.
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