1120-181K Equivalent & Substitute Parts Reference

Part Overview

The Bourns 1120-181K is a 180 µH unshielded drum core wirewound inductor rated for 4 A continuous current with 110 mOhm maximum DC resistance. This through-hole radial component operates across -55°C to 105°C and is designed for applications requiring fixed inductance filtering, energy storage, and signal conditioning in power supply and RF circuits.

The 1120-181K is classified as obsolete. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for legacy systems and ongoing production requirements.

Substiute Parts

1120-181K

Bourns Inc.In Stock: 11041120-181K Datasheet

Current PartRFQ

DC780-184K

API Delevan Inc.In Stock: 775DC780-184K Datasheet

SimilarRFQ

IHB2BV181K

Vishay DaleIn Stock: 1151IHB2BV181K Datasheet

SimilarRFQ

IHB2EB181K

Vishay DaleIn Stock: 1186IHB2EB181K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1120-181K are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 180 µH ±10%
• Current rating: minimum 4 A
• DC resistance: 110 mOhm maximum
• Core material: Ferrite
• Shielding: Unshielded
• Mounting: Through hole radial configuration
• Package: Vertical cylinder form factor
• Test frequency: 1 kHz

Identified Substitute Parts:

1. DC780-184K (API Delevan Inc.) – Full electrical and mechanical equivalence with extended operating temperature range (-55°C to 125°C) and active product status.

2. IHB2BV181K (Vishay Dale) – Meets inductance, DCR, and core specifications; current rating reduced to 2.9 A, suitable for applications with lower current requirements.

3. IHB2EB181K (Vishay Dale) – Meets inductance, DCR, and core specifications; current rating reduced to 2.9 A, suitable for applications with lower current requirements.

Parameter Comparison

Engineering Selection Recommendations

DC780-184K (API Delevan Inc.) is the primary substitute for the 1120-181K. This part maintains full electrical equivalence across all critical parameters: 180 µH inductance, 4 A current rating, and 110 mOhm maximum DCR. The DC780-184K offers an extended operating temperature range (-55°C to 125°C) compared to the original specification and carries active product status, ensuring long-term availability and supply chain stability. Both parts are RoHS non-compliant with identical regulatory classifications (EAR99, HTSUS 8504.50.x000).

IHB2BV181K and IHB2EB181K (Vishay Dale) are secondary substitutes suitable only for applications where the circuit current requirement does not exceed 2.9 A. These parts maintain the 180 µH inductance and 110 mOhm DCR specifications but are rated for reduced continuous current. Selection of these alternatives requires verification that the application's maximum operating current remains below 2.9 A to prevent inductor saturation and thermal stress.

For new designs or applications requiring the full 4 A rating, DC780-184K is the recommended substitute. For legacy systems operating below 2.9 A, either Vishay Dale option provides functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can DC780-184K directly replace 1120-181K in existing designs?

A: Yes. DC780-184K meets all electrical specifications of the 1120-181K: 180 µH inductance, ±10% tolerance, 4 A current rating, and 110 mOhm maximum DCR. Physical form factor (radial, vertical cylinder through-hole) is identical. The extended temperature range (-55°C to 125°C) provides additional operational margin.

Q: What is the key limitation of IHB2BV181K and IHB2EB181K substitutes?

A: Both Vishay Dale parts are rated for 2.9 A continuous current, compared to the 4 A rating of the 1120-181K. These substitutes are suitable only for circuits where peak and continuous current demands do not exceed 2.9 A. Exceeding this rating may cause inductor saturation and excessive heating.

Q: Are there physical dimension differences between substitute parts?

A: Minor dimensional variations exist. The 1120-181K measures 0.810" diameter (20.57 mm) with 0.840" seated height (21.34 mm). The DC780-184K measures 0.772" diameter (19.60 mm) with 0.831" seated height (21.10 mm). These differences are within typical PCB layout tolerances for radial through-hole components but should be verified against board footprint constraints.

Q: Do all substitute parts share the same RoHS and regulatory compliance status?

A: The 1120-181K and DC780-184K are both RoHS non-compliant with identical regulatory classifications (EAR99, HTSUS 8504.50.x000). Compliance information for Vishay Dale parts is not provided in the specification data. Regulatory status must be confirmed with the manufacturer before selection for applications with specific compliance requirements.

Q: What is the saturation current (Isat) specification for the 1120-181K?

A: Saturation current is not specified for the 1120-181K. The DC780-184K specifies Isat at 8.1 A, providing reference data for thermal and saturation margin analysis. Saturation current data for Vishay Dale parts is not available.

Q: Can these inductors be used interchangeably in high-frequency applications?

A: All parts are tested at 1 kHz. Self-resonant frequency and Q factor data are not provided for any part. High-frequency performance characteristics must be obtained directly from manufacturer datasheets before application in circuits operating significantly above 1 kHz.