DC1050R-474K Equivalent & Substitute Parts

Part Overview

The DC1050R-474K is a 470 µH fixed unshielded inductor manufactured by API Delevan Inc., rated for 3.2 A continuous current with a maximum DC resistance of 187 mOhm. This through-hole radial component operates across the temperature range of -55°C to 125°C and is designed for applications requiring stable inductance at 1 kHz test frequency.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances. The DC1050R-474K remains in active product status with 865 units in current inventory.

Key Parameters

Parameter	Value	Significance for Substitution
Inductance	470 µH ±10%	Core electrical specification; must match within tolerance
Current Rating	3.2 A	Continuous current capacity; substitutes must meet or exceed
DC Resistance (DCR)	187 mOhm Max	Power loss and thermal performance; critical for circuit design
Mounting Type	Through Hole	PCB assembly compatibility; must remain consistent
Package / Case	Radial, Vertical Cylinder	Physical footprint and board layout; must match
Operating Temperature	-55°C ~ 125°C	Environmental performance range; substitutes must cover or exceed
Shielding	Unshielded	EMI characteristics; must remain consistent
RoHS Status	ROHS3 Compliant	Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitution eligibility for the DC1050R-474K is determined by strict equivalence across the following parameters:

Electrical Equivalence Requirements:

Inductance value of 470 µH with ±10% tolerance
DC resistance of 187 mOhm maximum
Current rating equal to or greater than 3.2 A
Unshielded configuration

Mechanical Equivalence Requirements:

Through-hole mounting type
Radial, vertical cylinder package configuration
Physical dimensions compatible with PCB layout

Compliance Requirements:

ROHS3 compliance status
Operating temperature range that covers or exceeds -55°C to 125°C

The substitute part 1130-471K-RC (Bourns Inc.) meets all electrical and mechanical equivalence criteria. This part maintains the same inductance value, DC resistance specification, and package form factor while providing an increased current rating of 4 A, which exceeds the minimum 3.2 A requirement.

Parameter Comparison

Parameter	DC1050R-474K (API Delevan)	1130-471K-RC (Bourns)	Compatibility Status
Inductance	470 µH ±10%	470 µH ±10%	Equivalent
Current Rating (Amps)	3.2 A	4 A	Substitute exceeds requirement
DC Resistance (DCR)	187 mOhm Max	187 mOhm Max	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Radial, Vertical Cylinder	Radial, Vertical Cylinder	Equivalent
Operating Temperature	-55°C ~ 125°C	-55°C ~ 105°C	Substitute range narrower at upper limit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Inductance Test Frequency	1 kHz	1 kHz	Equivalent

Engineering Selection Recommendations

Primary Selection (DC1050R-474K): The DC1050R-474K remains the preferred component for applications requiring the full operating temperature range of -55°C to 125°C. This part is in active product status with established inventory availability (865 units in stock).

Substitute Selection (1130-471K-RC): The 1130-471K-RC is a valid substitute for applications where the operating temperature maximum does not exceed 105°C. This part provides equivalent electrical performance with a higher current rating (4 A versus 3.2 A), offering additional design margin. The substitute is also in active product status with comparable inventory availability (903 units in stock).

Both parts maintain ROHS3 compliance and are suitable for through-hole PCB assembly. Selection between these parts depends on the specific application's maximum operating temperature requirement and current margin specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1130-471K-RC replace the DC1050R-474K in all applications?

A: The 1130-471K-RC is a functional substitute provided the application does not require operation above 105°C. The DC1050R-474K supports operation to 125°C. For applications operating within -55°C to 105°C, the substitute part is electrically and mechanically compatible.

Q: What is the significance of the higher current rating on the substitute part?

A: The 1130-471K-RC is rated for 4 A continuous current compared to the 3.2 A rating of the DC1050R-474K. This higher rating provides additional design margin and thermal headroom in the application circuit. The DC resistance remains identical at 187 mOhm maximum, so power dissipation characteristics are equivalent at the original 3.2 A operating point.

Q: Are the physical dimensions identical between these parts?

A: Both parts use radial, vertical cylinder packaging with through-hole mounting. The DC1050R-474K has a diameter of 1.180" (29.98 mm) and height of 0.840" (21.34 mm). The 1130-471K-RC has a diameter of 1.100" (27.94 mm) and height of 0.840" (21.34 mm). The substitute part is slightly smaller in diameter but maintains the same height, which may provide improved PCB layout flexibility in space-constrained designs.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the DC1050R-474K and 1130-471K-RC are ROHS3 compliant and REACH unaffected. Both are classified under ECCN EAR99 for export control purposes.

Q: What is the inductance tolerance for both parts?

A: Both parts maintain ±10% inductance tolerance at 1 kHz test frequency. This tolerance applies equally to the DC1050R-474K and the 1130-471K-RC substitute.

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