DC780R-474K Equivalent & Substitute Parts

Part Overview

The DC780R-474K is a 470 µH unshielded drum core wirewound inductor manufactured by API Delevan Inc. This through-hole component is rated for 1.6 A continuous current with a maximum DC resistance of 355 mOhm and operates across the temperature range of -55°C to 125°C. The part is currently active in production and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Inductance	470	µH
Inductance Tolerance	±10	%
Current Rating	1.6	A
DC Resistance (Max)	355	mOhm
Core Material	Ferrite	—
Shielding	Unshielded	—
Mounting Type	Through Hole	—
Package Type	Radial, Vertical Cylinder	—
Operating Temperature Range	-55 to 125	°C
Inductance Test Frequency	1	kHz

Substitute Part Grouping Explanation

Substitution eligibility for the DC780R-474K is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Inductance value: 470 µH at 1.6 A
Inductance tolerance: ±10%
DC resistance: 355 mOhm maximum
Current rating: 1.6 A minimum
Core material: Ferrite
Shielding configuration: Unshielded

Mechanical Equivalence Requirements:

Mounting type: Through hole
Package configuration: Radial, vertical cylinder
Form factor compatibility with PCB footprint

Compliance Requirements:

ROHS3 compliance
REACH unaffected status
Active product status

The substitute part 1120-471K-RC (Bourns Inc.) meets all electrical and mechanical equivalence criteria. Dimensional variations within manufacturing tolerances do not preclude substitution when all electrical parameters and mounting specifications are satisfied.

Parameter Comparison

Parameter	DC780R-474K (API Delevan)	1120-471K-RC (Bourns)	Match Status
Inductance	470 µH	470 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
Current Rating	1.6 A	1.6 A	Equivalent
DC Resistance (Max)	355 mOhm	355 mOhm	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package Type	Radial, Vertical Cylinder	Radial, Vertical Cylinder	Equivalent
Operating Temperature Range	-55 to 125°C	-55 to 105°C	Partial: 1120-471K-RC has reduced upper limit
Inductance Test Frequency	1 kHz	1 kHz	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
Size (Diameter)	0.772" (19.60 mm)	0.810" (20.57 mm)	Within tolerance
Height (Seated Max)	0.831" (21.10 mm)	0.840" (21.34 mm)	Within tolerance

Engineering Selection Recommendations

DC780R-474K (API Delevan Inc.) is the primary specification. This part is active in production, ROHS3 compliant, and REACH unaffected. It supports the full operating temperature range of -55°C to 125°C and is available with 830 pieces in current inventory.

1120-471K-RC (Bourns Inc.) is an acceptable substitute when DC780R-474K availability is constrained. This part maintains electrical equivalence across all critical parameters: 470 µH inductance, 1.6 A current rating, and 355 mOhm maximum DC resistance. Both parts are ferrite core, unshielded, through-hole mounted in radial vertical cylinder configuration. Both are ROHS3 compliant and REACH unaffected with active product status.

Temperature Range Consideration: The 1120-471K-RC operates to 105°C maximum, compared to 125°C for the DC780R-474K. Applications requiring operation above 105°C must use the DC780R-474K. For applications with maximum operating temperature at or below 105°C, the 1120-471K-RC is functionally equivalent. The 1120-471K-RC has higher inventory availability (1700 pieces).

Dimensional Compatibility: Both parts are radial, vertical cylinder through-hole inductors with compatible PCB footprints. Dimensional variations (diameter and height) are within standard manufacturing tolerances and do not affect electrical performance or mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can 1120-471K-RC replace DC780R-474K in all applications?

A: The 1120-471K-RC is electrically and mechanically equivalent for applications operating at or below 105°C. Applications requiring operation above 105°C must use DC780R-474K, which is rated to 125°C.

Q: Are the physical dimensions compatible with the same PCB footprint?

A: Yes. Both parts are through-hole mounted radial vertical cylinder inductors. The 1120-471K-RC diameter is 0.810" (20.57 mm) versus 0.772" (19.60 mm) for DC780R-474K, and height is 0.840" (21.34 mm) versus 0.831" (21.10 mm). These dimensional differences are within standard manufacturing tolerances and do not affect PCB footprint compatibility.

Q: What are the critical electrical parameters for substitution?

A: Inductance (470 µH), inductance tolerance (±10%), current rating (1.6 A), and DC resistance (355 mOhm maximum) must be matched. Both parts meet these specifications.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both DC780R-474K and 1120-471K-RC are ROHS3 compliant and REACH unaffected.

Q: Which part should be selected for new designs?

A: DC780R-474K is the primary specification. Use 1120-471K-RC only when DC780R-474K is unavailable and application temperature requirements do not exceed 105°C.

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