Bourns 1140-123K Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Bourns 1140-123K is a 12 mH unshielded drum core wirewound inductor rated for 1.3 A with a maximum DC resistance of 3.04 Ohm. This through-hole radial component operates across a temperature range of -55°C to 105°C and is mounted vertically in a cylinder package measuring 1.500" diameter by 1.030" height.

The 1140-123K is classified as obsolete. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this inductance value and current rating.

Substiute Parts

1140-123K

Bourns Inc.In Stock: 9651140-123K Datasheet

Current PartRFQ

IHB4BV123K

Vishay DaleIn Stock: 1102IHB4BV123K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Bourns 1140-123K are identified based on the following critical parameters:

• Inductance Value: 12 mH (exact match required)
• DC Resistance: 3.04 Ohm maximum (determines power dissipation and thermal performance)
• Current Rating: Minimum 900 mA (substitute must support the application's current demands)
• Core Type: Wirewound, ferrite-based construction
• Shielding: Unshielded configuration
• Mounting: Through-hole radial, vertical cylinder package
• Temperature Range: Operating capability within -55°C to 105°C

The Vishay Dale IHB4BV123K meets these substitution criteria with compatible electrical specifications and package geometry.

Parameter Comparison

Engineering Selection Recommendations

The Vishay Dale IHB4BV123K serves as a direct substitute for the obsolete Bourns 1140-123K based on matching inductance, DC resistance, core material, and package configuration. Both components maintain identical electrical performance at the specified test frequency and support equivalent thermal operating ranges.

The primary consideration is current rating: the IHB4BV123K is rated for 900 mA compared to the 1140-123K's 1.3 A rating. Selection of the substitute should be confirmed against the actual circuit current demand. If the application requires the full 1.3 A capability, alternative sources or higher-rated inductors must be evaluated.

Both components are through-hole radial devices with vertical cylinder packages, ensuring mechanical compatibility in existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale IHB4BV123K replace the Bourns 1140-123K in all applications?

A: The IHB4BV123K matches the inductance value, DC resistance, core type, and package of the 1140-123K. However, the current rating differs: 900 mA versus 1.3 A. Substitution is valid only if the circuit current does not exceed 900 mA.

Q: What is the significance of matching DC resistance?

A: DC resistance directly affects power dissipation and thermal performance. Both parts specify 3.04 Ohm maximum, ensuring equivalent heat generation and thermal behavior in the circuit.

Q: Are the package dimensions identical between these parts?

A: Both components use radial, vertical cylinder packages with through-hole mounting. Physical compatibility is maintained for PCB layout purposes.

Q: What tolerance should be expected for inductance?

A: The Bourns 1140-123K specifies ±10% tolerance at 1 kHz. Tolerance information for the Vishay Dale substitute is not provided in the available data.

Q: Why is the 1140-123K classified as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. Identifying equivalent substitutes ensures continued availability for maintenance, repair, and new design applications.