Bourns 1120-331K Equivalent & Substitute Parts

Part Overview

The Bourns 1120-331K is a 330 µH unshielded drum core wirewound inductor rated for 1.6 A with a maximum DC resistance of 305 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 1120-331K carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this inductor.

Substiute Parts

1120-331K

Bourns Inc.In Stock: 8801120-331K Datasheet

Current PartRFQ

DC780-334K

API Delevan Inc.In Stock: 786DC780-334K Datasheet

SimilarRFQ

IHB2BV331K

Vishay DaleIn Stock: 804IHB2BV331K Datasheet

SimilarRFQ

IHB2EB331K

Vishay DaleIn Stock: 761IHB2EB331K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1120-331K are qualified based on the following critical parameters:

• Inductance Value: 330 µH (exact match required)
• Inductance Tolerance: ±10% (exact match required)
• Current Rating: Minimum 1.6 A (equal or higher acceptable)
• DC Resistance: 305 mOhm maximum (equal or lower acceptable)
• Core Material: Ferrite (exact match required)
• Shielding: Unshielded (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package Configuration: Radial, Vertical Cylinder (exact match required)
• Inductance Test Frequency: 1 kHz (exact match required)

All three identified substitute parts meet these substitution criteria. Dimensional variations within acceptable mechanical tolerances do not preclude functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

API Delevan DC780-334K is the primary substitute candidate. This part maintains active product status, ensuring ongoing availability and manufacturer support. It matches all critical electrical parameters and operates across an extended temperature range (-55°C to 125°C), providing additional thermal margin. Dimensional differences (0.772" diameter vs. 0.810" diameter) are minor and typically accommodated within standard PCB layout tolerances.

Vishay Dale IHB2BV331K and IHB2EB331K are functionally equivalent alternatives. Both parts provide equal or superior current ratings (1.7 A vs. 1.6 A) and maintain identical DC resistance specifications. These parts are suitable for direct substitution where space constraints or thermal requirements do not impose additional restrictions.

All three substitute parts carry non-compliant RoHS status, consistent with the original 1120-331K. Selection should account for application-specific compliance requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan DC780-334K be used as a direct replacement for the Bourns 1120-331K?

A: Yes. The DC780-334K meets all critical electrical specifications: 330 µH inductance, ±10% tolerance, 1.6 A current rating, and 305 mOhm maximum DC resistance. Minor dimensional variations do not affect electrical performance or standard through-hole mounting compatibility.

Q: What is the difference between the Vishay Dale IHB2BV331K and IHB2EB331K?

A: Both parts are electrically identical with respect to the provided specifications. They share the same inductance (330 µH), tolerance (±10%), current rating (1.7 A), and DC resistance (305 mOhm). Differences, if any, are not documented in the available technical parameters.

Q: Are there any thermal considerations when substituting the DC780-334K?

A: The DC780-334K operates to 125°C, compared to the 1120-331K maximum of 105°C. This extended range provides additional thermal margin and is not a limiting factor for substitution in applications designed for the original part.

Q: Do all substitute parts have the same physical footprint?

A: No. The DC780-334K has a slightly smaller diameter (0.772" vs. 0.810") and height (0.831" vs. 0.840"). Verify PCB layout and mechanical clearances before implementation. Vishay Dale part dimensions are not provided in the available data.

Q: What is the significance of the obsolete status of the 1120-331K?

A: Obsolete status indicates the manufacturer no longer produces this part. Substitute parts with active status (such as the DC780-334K) ensure continued supply chain access and manufacturer technical support for future production runs or design revisions.