Bourns 1120-102K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Bourns 1120-102K is a 1 mH unshielded drum core wirewound inductor rated for 1 A continuous current with a maximum DC resistance of 818 mOhm. This through-hole radial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring fixed inductance in compact form factors.

The 1120-102K has reached obsolete status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements.

Substiute Parts

1120-102K

Bourns Inc.In Stock: 7181120-102K Datasheet

Current PartRFQ

1120-102K-RC

Bourns Inc.In Stock: 12311120-102K-RC Datasheet

DirectRFQ

DC780-105K

API Delevan Inc.In Stock: 972DC780-105K Datasheet

SimilarRFQ

IHB2BV102K

Vishay DaleIn Stock: 1037IHB2BV102K Datasheet

SimilarRFQ

IHB2EB102K

Vishay DaleIn Stock: 1154IHB2EB102K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1120-102K are classified based on electrical and mechanical compatibility within the following criteria:

Direct Electrical Match: Inductance value (1 mH), tolerance (±10%), DC resistance (818 mOhm max), and test frequency (1 kHz) must be identical.

Mechanical Compatibility: Package type (radial, vertical cylinder), mounting method (through hole), and physical dimensions must accommodate the same PCB footprint and assembly process.

Current Rating Consideration: The main part specifies 1 A. Substitutes with equal or higher current ratings maintain thermal and saturation margin compatibility.

Core Material & Type: Ferrite drum core or equivalent wirewound construction ensures consistent inductance behavior across the operating frequency range.

Compliance & Status: Active product status and RoHS compliance are preferred for new designs; obsolete parts may be acceptable for legacy system support.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 1120-102K-RC

The 1120-102K-RC is the direct equivalent from Bourns Inc. It maintains identical electrical specifications (1 mH, 1 A, 818 mOhm DCR, ±10% tolerance) and mechanical form factor. The part is active in production status and ROHS3 compliant, making it the preferred choice for new designs and legacy system replacements. Packaging is available in bulk format.

Secondary Substitute: IHB2BV102K or IHB2EB102K

Both Vishay Dale IHB series inductors meet all electrical requirements with a higher current rating of 1.1 A, providing additional thermal margin. Both are ROHS3 compliant and active. Operating temperature extends to 130°C, exceeding the original specification. Physical dimensions are within acceptable tolerance for radial through-hole mounting. The IHB2EB102K is cross-referenced as a direct substitute in the product database.

Alternative Substitute: DC780-105K

The API Delevan DC780-105K matches all core electrical parameters and maintains the same package type. It provides extended operating temperature to 125°C and includes saturation current specification (4.6 A). Physical dimensions show minor variation (0.772" diameter vs. 0.810" for the original). This part is active but RoHS non-compliant. Use is appropriate for legacy systems where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the 1120-102K-RC be used as a direct replacement for the 1120-102K?

A: Yes. The 1120-102K-RC is electrically and mechanically identical to the 1120-102K. It shares the same inductance (1 mH), current rating (1 A), DC resistance (818 mOhm), tolerance (±10%), and physical form factor. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the Bourns and Vishay Dale substitutes?

A: The Vishay Dale IHB2BV102K and IHB2EB102K offer a higher current rating (1.1 A vs. 1 A) and extended operating temperature range (-55°C to 130°C vs. -55°C to 105°C). All other electrical parameters remain equivalent. Both are ROHS3 compliant. Physical dimensions are within acceptable tolerance for the same PCB footprint.

Q: Is the DC780-105K from API Delevan a suitable replacement?

A: The DC780-105K meets all core electrical specifications and is mechanically compatible. However, it is RoHS non-compliant. Use this part only in applications where RoHS compliance is not a requirement. Physical dimensions show minor variation (0.772" diameter vs. 0.810"), which may require footprint verification.

Q: Which substitute should I select for a new design?

A: For new designs, select the 1120-102K-RC (Bourns) or IHB2BV102K/IHB2EB102K (Vishay Dale). Both are active products with ROHS3 compliance. The 1120-102K-RC maintains exact compatibility with the original design. The Vishay options provide higher current rating and extended temperature range if your application requires these margins.

Q: Are there any dimensional differences between these parts?

A: The 1120-102K, 1120-102K-RC, and IHB2BV102K share nearly identical dimensions (0.810"-0.825" diameter, 0.840" height). The DC780-105K shows minor variation (0.772" diameter, 0.831" height). Verify PCB footprint tolerance before substitution if dimensional precision is critical.

Q: Can I use a substitute with a higher current rating in place of the 1 A rated part?

A: Yes. The IHB2BV102K and IHB2EB102K are rated for 1.1 A, which is compatible with circuits designed for 1 A operation. Higher current rating provides additional thermal margin and does not degrade performance in lower-current applications.