Bourns 1120-1R8M Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Bourns 1120-1R8M is a 1.8 µH unshielded drum core wirewound inductor rated for 11.4 A continuous current with a maximum DC resistance of 3 mOhm. This through-hole radial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring low-inductance, high-current filtering and energy storage circuits.

The 1120-1R8M is classified as obsolete. Equivalent substitute parts are available from active product lines that maintain identical or superior electrical and mechanical specifications, ensuring design continuity for existing applications and new production requirements.

Substiute Parts

1120-1R8M

Bourns Inc.In Stock: 7411120-1R8M Datasheet

Current PartRFQ

DC780-182L

API Delevan Inc.In Stock: 1052DC780-182L Datasheet

SimilarRFQ

IHB2BV1R8M

Vishay DaleIn Stock: 934IHB2BV1R8M Datasheet

SimilarRFQ

IHB2EB1R8M

Vishay DaleIn Stock: 662IHB2EB1R8M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1120-1R8M is determined by the following critical parameters:

• Inductance Value: 1.8 µH (exact match required)
• Current Rating: Minimum 11.4 A (equal or higher acceptable)
• DC Resistance: Maximum 3 mOhm (equal or lower acceptable)
• Core Material: Ferrite (required for performance equivalence)
• Shielding: Unshielded (required for package compatibility)
• Mounting Type: Through Hole (required for PCB compatibility)
• Package Configuration: Radial, Vertical Cylinder (required for footprint compatibility)

All identified substitute parts meet or exceed these core parameters, ensuring functional and mechanical interchangeability within the specified operating conditions.

Parameter Comparison

Engineering Selection Recommendations

API Delevan DC780-182L is the primary substitute for the obsolete Bourns 1120-1R8M. This part maintains identical inductance (1.8 µH), current rating (11.4 A), and DC resistance (3 mOhm) specifications. The DC780-182L offers improved tolerance (±15% versus ±20%), extended operating temperature range (-55°C to 125°C), and active product status with documented saturation current (81 A). Both parts share identical core material, shielding configuration, and through-hole radial package geometry.

Vishay Dale IHB2BV1R8M and IHB2EB1R8M are functionally equivalent alternatives with enhanced current ratings (17.4 A versus 11.4 A). These parts maintain the required 1.8 µH inductance, 3 mOhm maximum DC resistance, and identical package configuration. The higher current rating provides design margin for applications with potential current transients or future design modifications. Both Vishay Dale parts are from the active IHB series.

All three substitute parts maintain ferrite core construction, unshielded configuration, and through-hole radial mounting required for direct PCB footprint compatibility with the original 1120-1R8M design.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan DC780-182L directly replace the Bourns 1120-1R8M in existing designs?

A: Yes. The DC780-182L maintains identical inductance (1.8 µH), current rating (11.4 A), and DC resistance (3 mOhm) specifications. The radial, vertical cylinder package geometry and through-hole mounting are identical, ensuring direct PCB footprint compatibility without layout modifications.

Q: What is the advantage of using Vishay Dale IHB2BV1R8M or IHB2EB1R8M over the API Delevan DC780-182L?

A: The Vishay Dale parts provide a higher current rating (17.4 A versus 11.4 A) while maintaining the same inductance and DC resistance specifications. This additional current margin may be beneficial for applications with current transients or designs requiring future performance headroom.

Q: Are there mechanical differences between the substitute parts and the original 1120-1R8M?

A: Minor dimensional variations exist. The API Delevan DC780-182L has a slightly smaller diameter (0.772" versus 0.810") and height (0.831" versus 0.840"). The Vishay Dale parts do not specify dimensional data. All parts use identical radial, vertical cylinder package configuration and through-hole mounting, ensuring functional compatibility within standard PCB design tolerances.

Q: What is the inductance tolerance difference between these parts?

A: The Bourns 1120-1R8M specifies ±20% tolerance, while the API Delevan DC780-182L offers tighter ±15% tolerance. For applications requiring controlled inductance values, the DC780-182L provides improved specification compliance. Vishay Dale tolerance specifications are not provided in the available data.

Q: Are all substitute parts RoHS compliant?

A: The Bourns 1120-1R8M and API Delevan DC780-182L are both RoHS non-compliant. RoHS compliance status for the Vishay Dale IHB2BV1R8M and IHB2EB1R8M is not specified in the available documentation.