HC9-3R3-R Equivalent & Substitute Parts

Part Overview

The HC9-3R3-R is a 3.3 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 14.3 A continuous current with a maximum DC resistance of 4.87 mOhm and operates across the temperature range of -40°C to 155°C. The part is RoHS compliant and currently in active production status with substantial inventory availability.

Substitute parts are identified when equivalent inductance values, current ratings, and core material specifications align within the allowed electrical and mechanical parameters for this product category. The HC9-3R3-R may require substitution due to supply constraints, design optimization, or application-specific performance requirements.

Substiute Parts

HC9-3R3-R

Eaton - Electronics DivisionIn Stock: 1181HC9-3R3-R Datasheet

Current PartRFQ

SRP1265A-3R3M

Bourns Inc.In Stock: 14374SRP1265A-3R3M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HC9-3R3-R is determined by the following criteria:

Inductance Value: The substitute part must maintain the 3.3 µH inductance specification, measured at 100 kHz.

Current Rating: The substitute part must support a continuous current rating equal to or greater than 14.3 A to ensure equivalent or superior performance in the application circuit.

Saturation Current: The substitute part saturation current (Isat) must meet or exceed 22 A to maintain circuit stability under transient conditions.

DC Resistance: The substitute part DC resistance must not exceed 4.87 mOhm to ensure comparable power dissipation and thermal performance.

Core Type and Material: The substitute part must be a drum core wirewound inductor. Core material may vary (iron powder or carbonyl powder) provided electrical performance parameters are met.

Shielding Configuration: Shielded or unshielded configurations are acceptable provided the inductance and current specifications are maintained.

Mounting and Package: Surface mount configuration is required. Physical dimensions and height may vary within the constraints of the application PCB layout.

Compliance: RoHS compliance status must be maintained or upgraded.

The SRP1265A-3R3M from Bourns Inc. meets these substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

HC9-3R3-R Selection: Select the HC9-3R3-R when the application requires an unshielded inductor with iron powder core material, operates within the -40°C to 155°C temperature range, and the 4.87 mOhm DC resistance specification is critical for thermal management. RoHS compliance is confirmed. This part is in active production with high inventory availability.

SRP1265A-3R3M Selection: Select the SRP1265A-3R3M when the application benefits from shielded construction to reduce electromagnetic interference, requires higher current capacity (18 A continuous, 30 A saturation), or when carbonyl powder core characteristics are preferred. The SRP1265A-3R3M maintains RoHS3 compliance and AEC-Q200 automotive qualification. This part offers superior current handling and is available in higher quantities.

Compatibility Considerations: Both parts maintain the 3.3 µH inductance specification at 100 kHz. The SRP1265A-3R3M provides higher saturation current and continuous current rating, making it suitable for applications requiring design margin or higher transient current handling. The HC9-3R3-R offers lower DC resistance and extended upper operating temperature (155°C vs. 150°C). Physical dimensions differ slightly; PCB layout verification is required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can the SRP1265A-3R3M directly replace the HC9-3R3-R in all applications?

A: The SRP1265A-3R3M meets the core electrical specifications (3.3 µH inductance, 14.3 A minimum current rating, 22 A minimum saturation current). However, the higher DC resistance (6.8 mOhm vs. 4.87 mOhm) will result in increased power dissipation. Thermal analysis is required for applications where the lower DCR of the HC9-3R3-R is a design constraint. Physical dimensions differ; PCB layout must accommodate the SRP1265A-3R3M footprint.

Q: What is the significance of shielded versus unshielded construction?

A: The HC9-3R3-R is unshielded; the SRP1265A-3R3M is shielded. Shielded construction reduces radiated electromagnetic interference but typically increases DC resistance and physical size. Select shielded construction when EMI mitigation is required; select unshielded when minimizing DC resistance and size is prioritized.

Q: How do core materials (iron powder vs. carbonyl powder) affect performance?

A: Both iron powder and carbonyl powder cores support the 3.3 µH inductance specification. Iron powder cores (HC9-3R3-R) typically offer lower DC resistance. Carbonyl powder cores (SRP1265A-3R3M) may provide different frequency response characteristics and saturation behavior. Selection depends on application-specific frequency response and saturation requirements.

Q: Are there temperature range differences between these parts?

A: The HC9-3R3-R operates from -40°C to 155°C; the SRP1265A-3R3M operates from -40°C to 150°C. For applications requiring operation above 150°C, the HC9-3R3-R is required. For applications within -40°C to 150°C, both parts are suitable.

Q: What packaging differences exist between these parts?

A: The HC9-3R3-R is supplied in Tape & Reel (TR) packaging. The SRP1265A-3R3M is supplied in Cut Tape (CT) and Digi-Reel® packaging. Verify packaging compatibility with assembly equipment and procurement requirements.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. The HC9-3R3-R is RoHS Compliant. The SRP1265A-3R3M is ROHS3 Compliant. Both parts satisfy RoHS requirements. The SRP1265A-3R3M additionally carries AEC-Q200 automotive qualification.