Equivalent & Substitute Parts for Bourns 1130-122K

Part Overview

The Bourns 1130-122K is a 1.2 mH unshielded drum core wirewound inductor rated for 2 A continuous current with a maximum DC resistance of 426 mOhm. This through-hole radial 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 1130-122K has reached obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for existing applications and new production runs.

Substiute Parts

1130-122K

Bourns Inc.In Stock: 6851130-122K Datasheet

Current PartRFQ

DC1050-125K

API Delevan Inc.In Stock: 1148DC1050-125K Datasheet

SimilarRFQ

DC1050R-125K

API Delevan Inc.In Stock: 1026DC1050R-125K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1130-122K are qualified based on the following electrical and mechanical parameters:

• Inductance Value: Must match 1.2 mH at 1 kHz test frequency
• Inductance Tolerance: Must be ±10% or tighter
• Current Rating: Must support minimum 2 A continuous current
• DC Resistance: Substitute DCR values must not exceed the application's tolerance for power dissipation
• Core Material: Ferrite core construction
• Shielding Configuration: Unshielded design
• Mounting and Package: Through-hole radial vertical cylinder configuration
• Temperature Range: Must cover the operating window or provide equivalent thermal performance

The API Delevan DC1050-125K and DC1050R-125K meet these substitution criteria with compatible electrical specifications and mechanical form factors.

Parameter Comparison

Engineering Selection Recommendations

DC1050R-125K is the preferred substitute for new designs and production transitions. This part maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The extended operating temperature range of -55°C to 125°C provides additional thermal margin compared to the original 1130-122K specification.

DC1050-125K serves as an alternative substitute with identical electrical performance and active product status. This option remains available for applications where RoHS compliance is not a design requirement.

Both substitute parts exhibit slightly elevated DC resistance (462 mOhm maximum versus 426 mOhm maximum for the original part). Circuit designs must accommodate this 36 mOhm increase in series resistance to ensure power dissipation and thermal performance remain within acceptable limits.

The dimensional increase in diameter (1.180" versus 1.100") requires verification of PCB layout and mechanical clearance in existing designs before implementation.

Frequently Asked Questions (FAQ)

Q: Can DC1050-125K and DC1050R-125K be used interchangeably with the 1130-122K?

A: Both parts meet the core electrical substitution criteria: 1.2 mH inductance at ±10% tolerance, 2 A current rating, ferrite core, unshielded configuration, and through-hole radial mounting. Circuit designs must account for the 36 mOhm increase in maximum DC resistance and verify PCB layout compatibility with the larger 1.180" diameter.

Q: What is the impact of the higher DC resistance in the substitute parts?

A: The DC1050-125K and DC1050R-125K specify 462 mOhm maximum DCR compared to 426 mOhm for the 1130-122K. This 8.4% increase in series resistance results in proportionally higher power dissipation at rated current. Applications sensitive to inductor losses must evaluate thermal performance under operating conditions.

Q: Are there mechanical compatibility concerns?

A: The substitute parts have a larger diameter (1.180" versus 1.100") but maintain identical height (0.840"). PCB layouts must be verified to confirm adequate clearance around the inductor footprint. The radial through-hole mounting configuration remains unchanged.

Q: Which substitute part should be selected for new designs?

A: DC1050R-125K is recommended for new designs due to ROHS3 compliance and active product status, providing regulatory alignment and supply chain continuity. DC1050-125K remains available as an alternative where RoHS compliance is not required.

Q: Do the substitute parts support the full operating temperature range of the original part?

A: Both substitute parts extend the upper operating temperature limit to 125°C, exceeding the original 1130-122K specification of 105°C. The lower temperature limit remains -55°C, matching the original part.