Bourns 1120-1R2M Fixed Inductor - Equivalent & Substitute Parts

Part Overview

The Bourns 1120-1R2M is a 1.2 µH unshielded drum core wirewound inductor rated for 11.4 A continuous current with a maximum DC resistance of 3 mOhm. This through-hole radial component operates across a temperature range of -55°C to 105°C and is designed for applications requiring compact, high-current inductive filtering and energy storage.

The 1120-1R2M carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for legacy systems and new designs requiring compatible specifications.

Key Parameters

Parameter	Value
Inductance	1.2 µH
Current Rating	11.4 A
DC Resistance (Max)	3 mOhm
Core Type	Ferrite Drum Core
Shielding	Unshielded
Mounting Type	Through Hole
Package	Radial, Vertical Cylinder
Operating Temperature	-55°C to 105°C
Inductance Test Frequency	1 kHz

Substitute Part Grouping Explanation

Substitute parts for the 1120-1R2M are qualified based on the following critical parameters:

Inductance Value: 1.2 µH (primary electrical specification)
Current Rating: Minimum 11.4 A (functional requirement for load handling)
DC Resistance: Maximum 3 mOhm (thermal and efficiency constraint)
Core Material: Ferrite (electromagnetic performance characteristic)
Shielding Configuration: Unshielded (EMI profile and form factor)
Mounting Type: Through Hole (assembly compatibility)
Package Style: Radial, Vertical Cylinder (mechanical fit and PCB layout)

Substitute parts must satisfy all these parameters within their specified tolerances to ensure functional equivalence in the target application.

Parameter Comparison

Parameter	Bourns 1120-1R2M	API Delevan DC780-122L	Vishay Dale IHB2EB1R2M
Inductance	1.2 µH	1.2 µH	1.2 µH
Inductance Tolerance	±20%	±15%	Not specified
Current Rating (Amps)	11.4 A	11.4 A	17.4 A
DC Resistance (Max)	3 mOhm	3 mOhm	3 mOhm
Core Type	Ferrite Drum Core	Ferrite Drum Core	Ferrite Unshielded
Shielding	Unshielded	Unshielded	Unshielded
Mounting Type	Through Hole	Through Hole	Through Hole
Package	Radial, Vertical Cylinder	Radial, Vertical Cylinder	Radial, Vertical Cylinder
Operating Temperature	-55°C to 105°C	-55°C to 125°C	Not specified
Product Status	Obsolete	Active	Not specified
RoHS Status	Non-compliant	Non-compliant	Not specified

Engineering Selection Recommendations

API Delevan DC780-122L qualifies as a direct substitute. This part maintains identical inductance (1.2 µH), current rating (11.4 A), and DC resistance (3 mOhm) specifications. The DC780-122L carries active product status, ensuring ongoing availability and supply chain support. The component features an improved inductance tolerance (±15% versus ±20%) and an extended operating temperature range (-55°C to 125°C), providing enhanced performance margins. Both parts share non-compliant RoHS status.

Vishay Dale IHB2EB1R2M meets the core electrical requirements with matching inductance (1.2 µH) and DC resistance (3 mOhm). This part exceeds the current rating specification at 17.4 A, providing additional thermal headroom. The IHB2EB1R2M is suitable for applications where higher current capacity is beneficial or where future design margin is required. Inductance tolerance and operating temperature range are not specified in available data.

For legacy system maintenance requiring exact electrical performance match, the API Delevan DC780-122L is the preferred substitute due to active product status and documented specifications. The Vishay Dale IHB2EB1R2M is appropriate for new designs or upgrades where enhanced current capacity is advantageous.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan DC780-122L directly replace the Bourns 1120-1R2M in existing designs?

A: Yes. Both inductors share identical inductance (1.2 µH), current rating (11.4 A), DC resistance (3 mOhm), core material (ferrite), shielding configuration (unshielded), and package style (radial, vertical cylinder through-hole). The DC780-122L features improved inductance tolerance and extended temperature range, making it functionally equivalent and operationally superior.

Q: What is the primary advantage of the Vishay Dale IHB2EB1R2M?

A: The IHB2EB1R2M provides a higher current rating of 17.4 A compared to the 11.4 A specification of the original part. This additional capacity reduces thermal stress and extends component life in high-current applications. All other critical parameters (inductance, DC resistance, core type, package) remain compatible.

Q: Are there mechanical fit considerations when substituting these parts?

A: All three inductors use radial, vertical cylinder through-hole packages. Physical dimensions vary slightly: the Bourns 1120-1R2M measures 0.810" diameter × 0.840" height, while the API Delevan DC780-122L measures 0.772" diameter × 0.831" height. Verify PCB layout and clearance requirements before substitution, particularly in space-constrained designs.

Q: What compliance differences exist between these parts?

A: All three inductors carry non-compliant RoHS status. REACH status is unaffected for all parts. If RoHS compliance is required for new designs, alternative inductors meeting RoHS standards must be evaluated separately.

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

A: The API Delevan DC780-122L is recommended for new designs due to active product status, ensuring long-term availability and supply chain stability. The part's improved inductance tolerance (±15%) and extended operating temperature range (-55°C to 125°C) provide additional design margin. The Vishay Dale IHB2EB1R2M is suitable if higher current capacity (17.4 A) is required.

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