78F270J Equivalent & Substitute Parts

Part Overview

The Bourns 78F270J is a 27 µH unshielded drum core wirewound inductor rated for 135 mA with a maximum DC resistance of 1.35 Ohm. This through-hole axial component operates across the temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors. The 78F270J is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

78F270J

Bourns Inc.In Stock: 74778F270J Datasheet

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8230-54-RC

Bourns Inc.In Stock: 9098230-54-RC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 78F270J is determined by the following critical parameters:

• Inductance Value: Must be 27 µH to maintain circuit function
• Core Type & Shielding: Ferrite drum core, unshielded configuration
• Mounting Type: Through hole axial mounting required for PCB compatibility
• Operating Temperature Range: Must support -55°C to 105°C minimum
• Current Rating: Substitute must support the application's current requirements
• DC Resistance: Lower DCR values provide improved efficiency; higher values acceptable if circuit design permits
• Inductance Tolerance: Tighter tolerance (±5%) preferred but ±10% acceptable depending on circuit sensitivity

The 8230-54-RC meets the core substitution criteria of matching inductance value, core type, shielding configuration, mounting type, and operating temperature range. Differences in current rating, DC resistance, and tolerance reflect design evolution within the product family.

Parameter Comparison

Engineering Selection Recommendations

The 8230-54-RC serves as a direct functional substitute for the obsolete 78F270J based on matching inductance value, core construction, shielding, mounting configuration, and operating temperature specifications. The 8230-54-RC is classified as active product status, ensuring ongoing availability and supply chain continuity.

The 8230-54-RC exhibits higher DC resistance (4.6 Ohm vs. 1.35 Ohm) and wider inductance tolerance (±10% vs. ±5%). These differences require circuit-level evaluation. Applications sensitive to inductance tolerance or requiring minimal resistive losses must validate performance with the 8230-54-RC's specifications. The higher current rating (185 mA vs. 135 mA) of the 8230-54-RC provides additional design margin for current-limited applications.

The 8230-54-RC achieves ROHS3 compliance, addressing regulatory requirements that may apply to new designs or production transitions. The 78F270J remains RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can the 8230-54-RC directly replace the 78F270J in existing designs?

A: The 8230-54-RC matches the critical substitution parameters: 27 µH inductance, ferrite drum core unshielded construction, through-hole axial mounting, and -55°C to 105°C operating range. Circuit validation is required to confirm acceptable performance with the 8230-54-RC's higher DC resistance (4.6 Ohm vs. 1.35 Ohm) and wider inductance tolerance (±10% vs. ±5%).

Q: What are the key differences between these parts?

A: The primary differences are DC resistance, inductance tolerance, current rating, and self-resonant frequency. The 8230-54-RC provides higher current capacity and improved regulatory compliance (ROHS3). The 78F270J offers tighter inductance tolerance and lower DC resistance.

Q: Does the higher DC resistance of the 8230-54-RC affect circuit performance?

A: DC resistance impacts power dissipation and circuit impedance. Applications where resistive losses are critical must evaluate whether the 8230-54-RC's 4.6 Ohm maximum resistance remains within acceptable design parameters. The 78F270J's 1.35 Ohm maximum resistance produces lower losses.

Q: Are both parts available in the same package dimensions?

A: Both parts use through-hole axial packaging. Physical dimensions differ slightly: 78F270J is 0.110" Dia x 0.280" L; 8230-54-RC is 0.120" Dia x 0.300" L. PCB layout verification is required to confirm mechanical fit.

Q: What is the significance of the different self-resonant frequencies?

A: The 8230-54-RC exhibits a higher self-resonant frequency (22 MHz vs. 11 MHz), indicating different high-frequency behavior. Applications operating near or above the self-resonant frequency must validate performance with the specific part selected.

Q: Why is the 78F270J obsolete?

A: The 78F270J is classified as obsolete by the manufacturer. The 8230-54-RC represents the active product line continuation, ensuring long-term availability and supply chain support for new designs and production requirements.