70F757AP-RC Equivalent & Substitute Parts

Part Overview

The 70F757AP-RC is a 750 nH unshielded wirewound inductor manufactured by Bourns Inc., rated for 870 mA continuous current with a maximum DC resistance of 264 mOhm. This through-hole axial component operates across the temperature range of -55°C to 125°C and is classified as obsolete. Due to its obsolete status, identifying equivalent substitute parts with compatible electrical and mechanical specifications is essential for design continuity and procurement planning.

Substiute Parts

70F757AP-RC

Bourns Inc.In Stock: 79270F757AP-RC Datasheet

Current PartRFQ

511R-18J

API Delevan Inc.In Stock: 1017511R-18J Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 70F757AP-RC is determined by the following critical parameters:

• Inductance Value: Must be 750 nH to maintain circuit functionality
• Mounting Type & Package: Must be through-hole axial configuration for PCB compatibility
• Current Rating: Must support minimum 870 mA continuous current
• DC Resistance: Must not exceed 264 mOhm to ensure acceptable power dissipation
• Core Material & Shielding: Must be phenolic core, unshielded to match electromagnetic characteristics
• Operating Temperature Range: Must support -55°C to 125°C minimum
• Compliance: Must maintain ROHS3 compliance for regulatory alignment

The 511R-18J from API Delevan Inc. meets all substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

The 511R-18J is a direct functional substitute for the 70F757AP-RC based on the following factors:

• Both components share identical inductance values and core material specifications
• The 511R-18J provides superior current handling capability (1.115 A versus 870 mA), ensuring adequate margin for the original application
• DC resistance of the 511R-18J (180 mOhm) is lower than the 70F757AP-RC maximum (264 mOhm), resulting in reduced power dissipation
• Tolerance specification of ±5% on the 511R-18J is tighter than the ±20% tolerance of the original part, providing improved circuit performance predictability
• Both components maintain identical operating temperature ranges and comply with ROHS3 requirements
• The 511R-18J is currently in active production status, ensuring long-term availability and supply chain stability

Physical dimensions differ slightly (0.156" Dia x 0.375" L for 511R-18J versus 0.120" Dia x 0.310" L for 70F757AP-RC); PCB layout verification is required to confirm mechanical fit within the available board space.

Frequently Asked Questions (FAQ)

Q: Can the 511R-18J be used as a direct replacement for the 70F757AP-RC?

A: Yes. Both components share the same inductance value (750 nH), core material (phenolic), shielding configuration (unshielded), mounting type (through-hole axial), and operating temperature range (-55°C to 125°C). The 511R-18J exceeds the electrical requirements of the original part.

Q: What are the physical dimension differences between these parts?

A: The 70F757AP-RC measures 0.120" diameter by 0.310" length (3.05mm x 7.87mm). The 511R-18J measures 0.156" diameter by 0.375" length (3.96mm x 9.53mm). Verify that the larger footprint of the 511R-18J accommodates your PCB layout constraints.

Q: Does the lower DC resistance of the 511R-18J affect circuit operation?

A: No. Lower DC resistance (180 mOhm versus 264 mOhm maximum) reduces power dissipation and improves efficiency. This represents an improvement over the original specification.

Q: Are both parts RoHS compliant?

A: Yes. Both the 70F757AP-RC and 511R-18J are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: Why is the 70F757AP-RC listed as obsolete?

A: The 70F757AP-RC is classified as obsolete by the manufacturer. The 511R-18J, currently in active production status, provides equivalent functionality with improved specifications and assured long-term availability.

Q: What is the difference in tolerance between these inductors?

A: The 70F757AP-RC has a tolerance of ±20%, while the 511R-18J has a tolerance of ±5%. The tighter tolerance of the 511R-18J provides more precise inductance values for applications requiring strict circuit parameter control.