HC8-R39-R Equivalent & Substitute Parts

Part Overview

The HC8-R39-R is a 390 nH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 28.3 A continuous current with a maximum DC resistance of 1.55 mOhm and operates across the temperature range of -40°C to 155°C. The part is currently active in production and available in high volume inventory.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining compatibility with the application's mechanical and thermal requirements.

Substiute Parts

HC8-R39-R

Eaton - Electronics DivisionIn Stock: 965HC8-R39-R Datasheet

Current PartRFQ

SRP1038A-R39M

Bourns Inc.In Stock: 5633SRP1038A-R39M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HC8-R39-R is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 390 nH (within ±20% tolerance band)
• Current rating: minimum 28.3 A continuous
• Saturation current: minimum 45 A
• DC resistance: maximum 1.55 mOhm
• Core type: Drum core wirewound construction
• Mounting: Surface mount
• Package dimensions: compatible with 10.90 × 10.40 × 4.00 mm footprint
• Operating temperature: minimum -40°C to 155°C range
• Compliance: ROHS3 compliant, MSL 1

The substitute part SRP1038A-R39M meets these criteria with equivalent inductance, higher current rating capability, lower DC resistance, and compatible physical dimensions. Shielding difference (shielded vs. unshielded) and core material variation (carbonyl powder vs. iron powder) are secondary considerations that do not preclude substitution when primary electrical parameters are met.

Parameter Comparison

Engineering Selection Recommendations

HC8-R39-R Selection Criteria:

• Applications requiring unshielded inductor construction
• Systems operating at maximum temperature of 155°C
• Designs utilizing Eaton component ecosystem
• Inventory continuity with existing HC8 series stock

SRP1038A-R39M Selection Criteria:

• Applications benefiting from shielded construction to reduce electromagnetic interference
• Systems with thermal ceiling at 150°C or below
• Designs requiring lower DC resistance for reduced power dissipation
• Higher current margin applications (30 A vs. 28.3 A rating)
• AEC-Q200 automotive qualification requirement
• Designs utilizing Bourns component ecosystem

Both parts maintain ROHS3 compliance and MSL 1 rating. Selection between these parts depends on application-specific requirements for shielding, thermal operating point, and supply chain preference. The substitute part provides superior electrical performance in current handling and resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can SRP1038A-R39M directly replace HC8-R39-R on existing PCBs?

A: Physical footprint compatibility requires verification. The HC8-R39-R measures 10.90 × 10.40 mm while the SRP1038A-R39M measures 11.00 × 10.00 mm. The 0.10 mm length increase and 0.40 mm width decrease may require PCB layout adjustment depending on board routing constraints and component spacing.

Q: What is the impact of shielding difference between these parts?

A: The HC8-R39-R is unshielded while the SRP1038A-R39M is shielded. Shielding reduces radiated electromagnetic interference. In applications sensitive to EMI coupling, the shielded substitute may improve system performance. In applications where shielding is not required, both parts function equivalently at the specified inductance value.

Q: Are there temperature operating range limitations when substituting?

A: The HC8-R39-R operates to 155°C maximum while the SRP1038A-R39M operates to 150°C maximum. Applications requiring operation above 150°C must use the HC8-R39-R. Applications with thermal ceiling at 150°C or below can use either part.

Q: How do DC resistance differences affect circuit performance?

A: The SRP1038A-R39M has lower maximum DC resistance (1.3 mOhm vs. 1.55 mOhm). Lower resistance reduces I²R power dissipation and heat generation. In high-current applications, this 0.25 mOhm difference may provide thermal margin.

Q: What certifications apply to each part?

A: Both parts are ROHS3 compliant with MSL 1 rating. The SRP1038A-R39M carries AEC-Q200 automotive qualification; the HC8-R39-R does not list this certification in provided specifications.

Q: Can inductance tolerance affect substitution decisions?

A: Both parts specify ±20% inductance tolerance. At 390 nH nominal, this tolerance band spans 312 nH to 468 nH for both parts. Tolerance equivalence does not restrict substitution based on inductance specification alone.