HC9-1R5-R Equivalent & Substitute Parts

Part Overview

The HC9-1R5-R is a 1.5 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 21 A continuous current with a maximum DC resistance of 2.27 mOhm and operates across the temperature range of -40°C to 155°C. The part is currently active in production with RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining functional compatibility in the target application circuit.

Substiute Parts

HC9-1R5-R

Eaton - Electronics DivisionIn Stock: 1290HC9-1R5-R Datasheet

Current PartRFQ

SRP1265A-1R5M

Bourns Inc.In Stock: 1430SRP1265A-1R5M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HC9-1R5-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 1.5 µH (tolerance range ±15% to ±20% acceptable)
• Current rating: minimum 21 A continuous
• Saturation current: minimum 32 A
• DC resistance: maximum 3 mOhm (slight increase acceptable for thermal margin)
• Core type: Drum core wirewound construction
• Mounting: Surface mount, tape & reel packaging
• Temperature range: minimum -40°C to 150°C overlap

Substitution Logic: The SRP1265A-1R5M qualifies as a substitute because it maintains the same 1.5 µH inductance specification, exceeds the current rating requirement (27 A vs. 21 A), and provides higher saturation current (45 A vs. 32 A). The DC resistance increase from 2.27 mOhm to 3 mOhm remains within acceptable engineering margins for power loss calculations. Both parts use drum core wirewound construction and surface mount packaging. The operating temperature range overlap (-40°C to 150°C) covers the critical lower bound of the HC9-1R5-R specification.

Parameter Comparison

Engineering Selection Recommendations

HC9-1R5-R Selection Criteria: Select the HC9-1R5-R when the application requires an unshielded inductor with iron powder core characteristics and the upper operating temperature limit of 155°C is necessary. The lower DC resistance (2.27 mOhm) reduces power dissipation in high-current applications. RoHS compliance is confirmed.

SRP1265A-1R5M Selection Criteria: Select the SRP1265A-1R5M when electromagnetic shielding is beneficial to reduce coupling to adjacent circuit elements, or when the higher current and saturation ratings provide design margin for future specification changes. The shielded construction and carbonyl powder core offer different frequency response characteristics. ROHS3 compliance meets the latest regulatory requirements. The 5°C reduction in maximum operating temperature (-40°C to 150°C vs. -40°C to 155°C) must be evaluated against application thermal requirements.

Substitution Feasibility: Direct substitution of SRP1265A-1R5M for HC9-1R5-R is feasible in applications where:

• EMI shielding does not negatively impact circuit performance
• The 0.73 mOhm increase in DC resistance is acceptable for thermal budget
• Operating temperature does not exceed 150°C
• Carbonyl powder core frequency response is compatible with circuit design

Frequently Asked Questions (FAQ)

Q: Can the SRP1265A-1R5M directly replace the HC9-1R5-R in all applications?

A: Direct substitution is feasible for most applications due to matching inductance values and superior current ratings. However, three factors require evaluation: (1) the shielded construction of the Bourns part may alter EMI characteristics; (2) the carbonyl powder core material differs from iron powder, affecting frequency response; (3) the maximum operating temperature is 5°C lower (150°C vs. 155°C). Verify these parameters against your specific circuit requirements before implementation.

Q: What is the significance of the DC resistance difference between these parts?

A: The HC9-1R5-R has a maximum DC resistance of 2.27 mOhm, while the SRP1265A-1R5M is rated at 3 mOhm maximum. This 0.73 mOhm difference results in increased power dissipation at rated current. At 21 A, the additional loss is approximately 0.32 mW. For thermal-sensitive applications or designs operating near thermal limits, calculate the cumulative power dissipation to confirm acceptability.

Q: Why does the Bourns part have a wider inductance tolerance (±20% vs. ±15%)?

A: Inductance tolerance is determined by core material properties and manufacturing process control. The Eaton HC9 series specifies ±15% tolerance, while the Bourns SRP1265A series specifies ±20%. Both tolerances are within acceptable ranges for most filter and energy storage applications. If your circuit requires tighter inductance control, the HC9-1R5-R is the preferred choice.

Q: What is the practical difference between shielded and unshielded construction?

A: The HC9-1R5-R is unshielded, while the SRP1265A-1R5M is shielded. Shielding reduces magnetic field coupling to nearby components and traces, reducing EMI. Unshielded inductors typically have lower cost and smaller footprint. In high-density layouts or noise-sensitive circuits, the shielded SRP1265A-1R5M may provide better performance. In applications where EMI is not a concern, the unshielded HC9-1R5-R is acceptable.

Q: Are both parts available in the same package format?

A: Yes. Both the HC9-1R5-R and SRP1265A-1R5M are supplied in Tape & Reel (TR) packaging for surface mount assembly. Physical dimensions differ slightly (HC9: 13.40mm L × 13.10mm W × 7.50mm H; SRP1265A: 13.50mm L × 12.50mm W × 6.40mm H), but both fit standard surface mount assembly equipment. Verify PCB footprint compatibility before design release.

Q: What certifications apply to each part?

A: The HC9-1R5-R is RoHS Compliant. The SRP1265A-1R5M is ROHS3 Compliant and carries AEC-Q200 automotive qualification. Both parts are REACH Unaffected and classified as EAR99 for export control purposes. If automotive-grade reliability is required, the SRP1265A-1R5M provides additional qualification documentation.