IHB4EB121K Equivalent & Substitute Parts

Part Overview

The IHB4EB121K is a 120 µH unshielded wirewound inductor manufactured by Vishay Dale, rated for 9 A continuous current with a maximum DC resistance of 28 mOhm. This through-hole radial component is designed for applications requiring fixed inductance in power conversion, filtering, and energy storage circuits. With 1092 pieces in current inventory, substitute parts may be required due to supply constraints, design optimization, or application-specific performance requirements.

Substiute Parts

IHB4EB121K

Vishay DaleIn Stock: 1166IHB4EB121K Datasheet

Current PartRFQ

1140-121K-RC

Bourns Inc.In Stock: 16291140-121K-RC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the IHB4EB121K is based on the following critical parameters:

• Inductance Value: 120 µH (exact match required)
• Current Rating: Minimum 9 A continuous current capability
• DC Resistance: Maximum 28 mOhm to maintain equivalent power loss characteristics
• Mounting Type: Through-hole radial configuration
• Package Form Factor: Vertical cylinder geometry for PCB compatibility
• Shielding Classification: Unshielded construction

The substitute part 1140-121K-RC from Bourns Inc. meets all substitution criteria within the allowed parameter tolerance range.

Parameter Comparison

Engineering Selection Recommendations

The 1140-121K-RC from Bourns Inc. is a direct functional equivalent to the IHB4EB121K. Selection between these parts should be based on:

• Product Status: The 1140-121K-RC is listed as Active, ensuring continued availability and manufacturing support.
• Compliance Certifications: The Bourns substitute carries ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for restricted substances.
• Current Margin: The 1140-121K-RC provides 9.9 A rating versus the 9 A requirement, offering 10% additional current capacity without exceeding the 28 mOhm DCR specification.
• Mechanical Compatibility: Identical radial, vertical cylinder package geometry ensures direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 1140-121K-RC replace the IHB4EB121K in existing designs?

A: Yes. Both parts share identical inductance (120 µH), DC resistance (28 mOhm Max), shielding classification (unshielded), and through-hole radial package geometry. The Bourns substitute provides equivalent electrical performance with higher current rating (9.9 A vs. 9 A).

Q: What are the key parameters that determine substitution eligibility?

A: Inductance value, current rating, DC resistance, shielding type, mounting configuration, and package form factor. All must match or exceed the original specification within the allowed tolerance range.

Q: Does the higher current rating of the 1140-121K-RC affect circuit operation?

A: No. A higher current rating indicates greater saturation margin and thermal headroom. The part will perform identically at the design current of 9 A.

Q: Are there packaging differences between these inductors?

A: Both parts use through-hole radial, vertical cylinder packaging. Physical dimensions are compatible for standard PCB layouts.

Q: What compliance standards apply to the substitute part?

A: The 1140-121K-RC is ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations.