Equivalent & Substitute Parts for Bourns 1120-180K

Part Overview

The Bourns 1120-180K is an 18 µH unshielded drum core wirewound inductor rated for 7.2 A continuous current with 18 mOhm maximum DC resistance. This through-hole radial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors. The product is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Inductance	18 µH
Inductance Tolerance	±10%
Current Rating	7.2 A
DC Resistance (Max)	18 mOhm
Core Type	Ferrite Drum Core
Shielding	Unshielded
Mounting Type	Through Hole
Package Type	Radial, Vertical Cylinder
Operating Temperature Range	-55°C to 105°C
Test Frequency	1 kHz

Substitute Part Grouping Explanation

Substitution for the Bourns 1120-180K is determined by strict equivalence across the following critical parameters:

Inductance Value: 18 µH (exact match required)
Inductance Tolerance: ±10% (matching tolerance band)
Current Rating: Minimum 7.1 A (substitute must support the application current)
DC Resistance: 18 mOhm maximum (electrical performance equivalence)
Core Material: Ferrite (electromagnetic characteristics)
Shielding Configuration: Unshielded (EMI profile match)
Mounting Type: Through Hole (assembly compatibility)
Package Form: Radial, Vertical Cylinder (mechanical fit)

All three substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the original component.

Parameter Comparison

Parameter	Bourns 1120-180K	API Delevan DC780-183K	Vishay Dale IHB2BV180K	Vishay Dale IHB2EB180K
Inductance	18 µH	18 µH	18 µH	18 µH
Inductance Tolerance	±10%	±10%	±10%	±10%
Current Rating (Amps)	7.2 A	7.2 A	7.1 A	7.1 A
DC Resistance (Max)	18 mOhm	18 mOhm	18 mOhm	18 mOhm
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Wirewound	Ferrite Wirewound
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Mounting Type	Through Hole	Radial	Radial	Radial
Package Form	Radial, Vertical Cylinder	Radial, Vertical Cylinder	Radial, Vertical Cylinder	Radial, Vertical Cylinder
Operating Temperature Range	-55°C to 105°C	-55°C to 125°C	Not specified	Not specified
Product Status	Obsolete	Active	Not specified	Not specified
RoHS Status	Non-compliant	Non-compliant	Not specified	Not specified

Engineering Selection Recommendations

API Delevan DC780-183K is the primary substitute option. This part maintains active product status, ensuring long-term availability and supply chain stability. It provides identical electrical specifications (18 µH, 7.2 A, 18 mOhm) with an extended operating temperature range (-55°C to 125°C), offering improved thermal margin over the original component. Both the original and this substitute share non-compliant RoHS status.

Vishay Dale IHB2BV180K and IHB2EB180K are secondary substitutes. Both maintain the required 18 µH inductance, ±10% tolerance, and 18 mOhm DC resistance. Current ratings are marginally lower at 7.1 A versus the original 7.2 A specification. These parts are suitable for applications where the 7.1 A rating meets system requirements. Product status and compliance information for these Vishay parts are not provided in the specification data.

Selection should prioritize the API Delevan DC780-183K for new designs and production continuity due to active status and documented thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale IHB2BV180K or IHB2EB180K be used if my circuit requires the full 7.2 A rating?

A: No. These parts are rated for 7.1 A maximum continuous current. If your application requires 7.2 A operation, use the API Delevan DC780-183K or the original Bourns 1120-180K if available from inventory.

Q: Are there dimensional differences between these substitutes?

A: Yes. The Bourns 1120-180K has a diameter of 0.810" (20.57mm) and height of 0.840" (21.34mm). The API Delevan DC780-183K has a diameter of 0.772" (19.60mm) and height of 0.831" (21.10mm). Verify PCB pad spacing and component clearances before substitution.

Q: What is the difference between the two Vishay Dale parts (IHB2BV180K and IHB2EB180K)?

A: Both parts share identical electrical specifications (18 µH, 7.1 A, 18 mOhm). The designation difference (BV versus EB) indicates different internal construction or packaging variants. Consult Vishay datasheets for specific mechanical or performance distinctions.

Q: Is the extended temperature range of the API Delevan part (-55°C to 125°C) a significant advantage?

A: The extended upper temperature limit of 125°C versus the original 105°C provides additional thermal margin. This is beneficial for applications operating in high-temperature environments or with limited thermal management. For standard operating conditions within -55°C to 105°C, this advantage is not critical.

Q: Can I use these substitutes in existing assemblies without PCB modification?

A: Dimensional variations exist. The API Delevan DC780-183K is slightly smaller than the original. Verify that component leads align with existing through-hole pads and that clearances to adjacent components are maintained. Physical testing on a sample assembly is recommended before full production transition.

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