Bourns 1120-3R3M Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Bourns 1120-3R3M is a 3.3 µH unshielded drum core wirewound inductor rated for 11.4 A continuous current with 5 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 1120-3R3M is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and redesign applications.

Substiute Parts

1120-3R3M

Bourns Inc.In Stock: 9461120-3R3M Datasheet

Current PartRFQ

DC780-332L

API Delevan Inc.In Stock: 974DC780-332L Datasheet

SimilarRFQ

IHB2BV3R3M

Vishay DaleIn Stock: 1090IHB2BV3R3M Datasheet

SimilarRFQ

IHB2EB3R3M

Vishay DaleIn Stock: 1035IHB2EB3R3M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1120-3R3M must satisfy the following core electrical and mechanical criteria:

• Inductance value: 3.3 µH (tolerance variations acceptable within design margin)
• Current rating: minimum 11.4 A
• DC resistance: maximum 5 mOhm
• Core material: Ferrite
• Mounting: Through hole radial configuration
• Package form: Vertical cylinder geometry compatible with PCB footprints

The following parts meet these substitution criteria:

1. API Delevan DC780-332L - Active status, improved tolerance (±15%), extended temperature range to 125°C, higher saturation current (60 A)
2. Vishay Dale IHB2BV3R3M - Higher current rating (14.6 A), same inductance and DCR specifications
3. Vishay Dale IHB2EB3R3M - Higher current rating (14.6 A), same inductance and DCR specifications

Parameter Comparison

Engineering Selection Recommendations

API Delevan DC780-332L is the primary substitute for new designs and production continuity. This part maintains electrical equivalence while offering active product status, tighter inductance tolerance (±15% vs ±20%), and extended operating temperature range to 125°C. Both parts carry identical RoHS non-compliant status.

Vishay Dale IHB2BV3R3M and IHB2EB3R3M provide electrical substitution with increased current margin (14.6 A vs 11.4 A). These parts satisfy all core electrical requirements and maintain the same DC resistance specification. Selection between these variants depends on specific package and series requirements for your application.

All three substitute parts are through-hole radial configurations compatible with the original 1120-3R3M PCB footprint geometry.

Frequently Asked Questions (FAQ)

Q: Can the DC780-332L directly replace the 1120-3R3M in existing designs?

A: Yes. Both parts share identical inductance (3.3 µH), current rating (11.4 A), and DC resistance (5 mOhm Max). The DC780-332L offers improved tolerance and extended temperature range, making it functionally equivalent for the specified electrical parameters.

Q: What is the difference between the Vishay Dale IHB2BV3R3M and IHB2EB3R3M?

A: Both parts are electrically identical with 3.3 µH inductance, 14.6 A current rating, and 5 mOhm DC resistance. The designation difference (BV vs EB) indicates different package or series variants. Consult the specific datasheet for mechanical and packaging distinctions.

Q: Are there physical size differences between these substitutes?

A: Yes. The DC780-332L has a diameter of 0.772" (19.60 mm) and height of 0.831" (21.10 mm), compared to the 1120-3R3M at 0.810" (20.57 mm) diameter and 0.840" (21.34 mm) height. Verify PCB layout clearance before substitution.

Q: Do all substitutes meet the same compliance requirements?

A: The 1120-3R3M and DC780-332L are both RoHS non-compliant and REACH unaffected. Compliance status for the Vishay Dale parts is not specified in available data. Confirm compliance requirements for your application before final selection.

Q: Which substitute offers the best thermal performance?

A: The DC780-332L operates to 125°C, extending 20°C above the 1120-3R3M maximum of 105°C. This provides additional thermal margin for high-temperature applications.