Request Quote
(Ships tomorrow)
70F756AI-RC Equivalent & Substitute Parts
Part Overview
The 70F756AI-RC is a 7.5 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 566 mA with a maximum DC resistance of 624mOhm. This through-hole axial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance in the microhenry range.
The 70F756AI-RC is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this inductor specification.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 7.5 µH |
| Tolerance | ±10% |
| Current Rating | 566 mA |
| DC Resistance (Max) | 624mOhm |
| Core Type | Iron, Drum Core, Unshielded |
| Mounting Type | Through Hole, Axial |
| Operating Temperature Range | -55°C to 105°C |
| Test Frequency | 7.9 MHz |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the 70F756AI-RC is evaluated based on the following critical parameters:
- Inductance Value: Must match 7.5 µH
- Mounting Configuration: Must be through-hole axial
- Core Type: Must be iron drum core, unshielded
- Operating Temperature Range: Must support -55°C to 105°C minimum
- Current Rating: Substitute must support the application's current requirements
- DC Resistance: Lower or equivalent resistance is acceptable
- Compliance: Must maintain ROHS3 compliance
The 511R-42J from API Delevan Inc. meets these substitution criteria. It provides the same 7.5 µH inductance value, identical mounting type, core construction, and temperature range. The substitute exhibits improved tolerance (±5% vs. ±10%), lower DC resistance (550mOhm vs. 624mOhm), and higher Q factor (50 vs. 32 @ 7.9MHz), making it functionally compatible for this application category.
Parameter Comparison
| Parameter | 70F756AI-RC (Bourns) | 511R-42J (API Delevan) |
|---|---|---|
| Inductance | 7.5 µH | 7.5 µH |
| Tolerance | ±10% | ±5% |
| Current Rating (Amps) | 566 mA | 420 mA |
| DC Resistance (Max) | 624mOhm | 550mOhm |
| Q @ 7.9MHz | 32 | 50 |
| Frequency - Self Resonant | 44MHz | 55MHz |
| Core Type | Iron, Drum Core, Unshielded | Iron, Drum Core, Unshielded |
| Operating Temperature | -55°C to 105°C | -55°C to 105°C |
| Mounting Type | Through Hole, Axial | Through Hole, Axial |
| Package / Case | Axial | Axial |
| Size / Dimension | 0.150" Dia x 0.250" L (3.81mm x 6.35mm) | 0.156" Dia x 0.375" L (3.96mm x 9.53mm) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The 511R-42J is the identified substitute for the obsolete 70F756AI-RC. Selection of this substitute is supported by the following factors:
- Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.
- Product Status: The 511R-42J is active in production, providing reliable supply chain availability compared to the obsolete 70F756AI-RC.
- Electrical Equivalence: Matching inductance value (7.5 µH), core type, and operating temperature range ensure functional compatibility in the intended application circuit.
- Performance Improvement: The substitute offers tighter tolerance (±5%), lower DC resistance, and higher Q factor, representing an enhancement over the original specification.
Critical Consideration: The 511R-42J has a maximum current rating of 420 mA, compared to the 70F756AI-RC at 566 mA. Component selection must confirm that the application's actual current demand does not exceed 420 mA to ensure safe operation.
Frequently Asked Questions (FAQ)
Q: Can the 511R-42J directly replace the 70F756AI-RC in existing designs?
A: The 511R-42J is electrically and mechanically compatible for applications where the current requirement does not exceed 420 mA. Physical dimensions differ slightly (0.156" Dia x 0.375" L vs. 0.150" Dia x 0.250" L), requiring verification of PCB layout and mechanical clearance. Both components are through-hole axial inductors with identical inductance, core type, and operating temperature range.
Q: What is the significance of the current rating difference?
A: The 70F756AI-RC is rated for 566 mA, while the 511R-42J is rated for 420 mA. The substitute can only be used in applications where the actual operating current remains at or below 420 mA. Exceeding this rating may result in inductor saturation and performance degradation.
Q: How do tolerance differences affect circuit performance?
A: The 511R-42J provides ±5% tolerance compared to the 70F756AI-RC at ±10%. Tighter tolerance in the substitute reduces inductance variation across the production batch, potentially improving circuit stability and reducing design margin requirements.
Q: Are there packaging differences between these components?
A: The 70F756AI-RC is supplied in standard packaging, while the 511R-42J is available in Tape & Reel (TR) format. Both are through-hole axial components suitable for manual or automated assembly. Tape & Reel packaging is standard for high-volume production environments.
Q: Do both components meet the same regulatory requirements?
A: Yes. Both the 70F756AI-RC and 511R-42J are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8504.50.8000. Regulatory compliance is maintained with this substitution.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts