SDS850R-184M Equivalent & Substitute Parts

Part Overview

The SDS850R-184M is a 180 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 350 mA with a maximum DC resistance of 1.05Ohm. This surface mount component operates across the temperature range of -40°C to 85°C and is classified as obsolete. Due to its obsolete product status, identifying equivalent substitute parts is essential for ongoing design support, production continuity, and component sourcing in applications requiring this inductance value and current rating.

Key Parameters

Parameter	Value
Inductance	180 µH
Current Rating	350 mA
DC Resistance (DCR)	1.05Ohm Max
Core Type	Ferrite Drum Core, Shielded
Mounting Type	Surface Mount
Physical Dimensions	0.413" L x 0.315" W x 0.189" H (10.50mm x 8.00mm x 4.80mm)
Operating Temperature Range	-40°C to 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SDS850R-184M is determined by strict equivalence across the following critical parameters:

Primary Matching Criteria:

Inductance value: 180 µH
Current rating: 350 mA minimum
DC resistance: 1.05Ohm maximum
Core material and shielding: Ferrite, shielded configuration
Mounting type: Surface mount
Physical footprint: 10.50mm x 8.00mm base dimensions
Regulatory compliance: ROHS3 compliant

The substitute part SRR0805-181K from Bourns Inc. meets all primary matching criteria. Both components share identical inductance specifications, current ratings, DC resistance limits, core construction, and surface mount packaging. Physical dimensions are equivalent within acceptable tolerances for PCB assembly compatibility.

Parameter Comparison

Parameter	SDS850R-184M (API Delevan)	SRR0805-181K (Bourns)	Match Status
Inductance	180 µH	180 µH	Equivalent
Inductance Tolerance	±20%	±10%	Substitute Tighter
Current Rating (Amps)	350 mA	350 mA	Equivalent
DC Resistance (DCR)	1.05Ohm Max	1.05Ohm Max	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Shielded	Shielded	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Length x Width	0.413" x 0.315" (10.50mm x 8.00mm)	0.413" x 0.315" (10.50mm x 8.00mm)	Equivalent
Height (Seated Max)	0.189" (4.80mm)	0.185" (4.70mm)	Compatible
Operating Temperature	-40°C to 85°C	-40°C to 125°C	Substitute Extended
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL Rating	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The SRR0805-181K from Bourns Inc. is a direct functional equivalent for the obsolete SDS850R-184M. Selection of this substitute is supported by the following engineering factors:

Compliance and Regulatory Status: Both components maintain ROHS3 compliance and identical MSL 1 ratings, ensuring compatibility with current manufacturing and environmental standards.

Product Availability: The SRR0805-181K maintains active product status with documented inventory availability, addressing the obsolescence constraint of the original component.

Electrical Performance: Matching inductance, current rating, and DC resistance specifications ensure functional equivalence in circuit applications. The substitute component offers tighter inductance tolerance (±10% versus ±20%), which provides improved performance consistency.

Thermal Capability: The substitute part extends the operating temperature range to -40°C to 125°C, providing enhanced thermal margin compared to the original -40°C to 85°C specification.

Physical Compatibility: Identical base footprint dimensions (10.50mm x 8.00mm) and compatible seated heights (4.70mm versus 4.80mm) ensure direct PCB assembly compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the SRR0805-181K directly replace the SDS850R-184M in existing designs?

A: Yes. Both components share identical inductance values (180 µH), current ratings (350 mA), DC resistance specifications (1.05Ohm max), core construction (ferrite shielded), and surface mount footprints (10.50mm x 8.00mm). Physical dimensions are compatible for PCB assembly without layout changes.

Q: What are the key differences between these two inductors?

A: The SRR0805-181K offers three improvements: tighter inductance tolerance (±10% versus ±20%), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and active product status versus obsolete status. DC resistance and current ratings remain identical.

Q: Are there any compliance or certification differences?

A: No. Both components maintain ROHS3 compliance, identical MSL 1 ratings, and equivalent REACH and ECCN classifications. Regulatory compliance is fully maintained with the substitute part.

Q: Does the substitute part require any circuit design modifications?

A: No circuit modifications are required. Electrical specifications are equivalent. The tighter tolerance of the substitute may improve circuit performance consistency but does not necessitate design changes.

Q: What is the physical height difference, and does it affect PCB assembly?

A: The substitute part height is 4.70mm (seated max) compared to 4.80mm for the original. This 0.10mm difference is within standard PCB assembly tolerances and does not affect component placement or clearance.

Q: Is the substitute part available in the same packaging format?

A: The SRR0805-181K is supplied in Tape & Reel (TR) packaging, which is standard for surface mount production. Verify packaging requirements for your specific procurement needs.

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