SPD127-183M

Part Overview

The SPD127-183M is an 18 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 3.9 A with a maximum DC resistance of 52 mOhm. This component operates across a temperature range of -55°C to 125°C and is mounted as a surface mount nonstandard package device.

The SPD127-183M is classified as obsolete. Locating equivalent and substitute parts is necessary to ensure design continuity, supply chain reliability, and access to functionally compatible alternatives that meet the electrical and mechanical requirements of the original specification.

Substiute Parts

SPD127-183M

API Delevan Inc.In Stock: 995SPD127-183M Datasheet

Current PartRFQ

HRSPD127-183M

API Delevan Inc.In Stock: 816HRSPD127-183M Datasheet

SimilarRFQ

SRR1208-180ML

Bourns Inc.In Stock: 3277SRR1208-180ML Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127-183M are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 18 µH (exact match required)
• Inductance tolerance: ±20% (same specification)
• Core material: Ferrite (same type)
• Shielding: Shielded (same configuration)
• Mounting type: Surface Mount (same type)
• Package type: Nonstandard (same category)

Electrical Compatibility Parameters:

• Current rating: Minimum 3.9 A (equal to or greater than original)
• DC resistance: 52 mOhm or lower (to maintain or improve performance)
• Operating temperature range: Must cover or exceed -55°C to 125°C

Mechanical Compatibility Parameters:

• Footprint dimensions: 12.00mm x 12.00mm nominal (small variations acceptable within nonstandard package tolerance)
• Height: 8.00mm maximum seated height (physical clearance requirement)

The two substitute parts—HRSPD127-183M and SRR1208-180ML—satisfy these criteria with matching inductance values, ferrite core construction, shielded design, and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-183M (API Delevan Inc.)

The HRSPD127-183M is manufactured by the same supplier as the original SPD127-183M. It maintains identical inductance and tolerance specifications with improved thermal performance (-55°C to 130°C). The device carries RoHS non-compliant status, matching the original component's environmental designation. This part is classified as active in production and has adequate inventory availability (802 units).

Consideration: Current rating of 3.4 A is lower than the original 3.9 A specification. This substitute is appropriate for designs where the actual current draw does not exceed 3.4 A, or where margin analysis confirms this reduced rating is acceptable.

SRR1208-180ML (Bourns Inc.)

The SRR1208-180ML offers the most favorable electrical characteristics, including lower DC resistance (40 mOhm maximum) and a current rating of 3.8 A, which approaches the original 3.9 A specification. This device is ROHS3 compliant and carries full RoHS3 certification, representing an upgrade in environmental compliance. The part is active in production with substantial inventory (3,250 units) and offers improved availability.

Considerations: Physical footprint is slightly larger (12.70mm x 12.70mm) and seated height is greater (8.50mm) compared to the original. Verify PCB layout and clearance requirements before selection. The operating temperature range (-40°C to 125°C) does not extend to -55°C; verify minimum temperature requirement for the application.

Frequently Asked Questions (FAQ)

Q: Can I use the HRSPD127-183M as a direct replacement for the SPD127-183M?

A: Electrical substitution is possible if your circuit's maximum current requirement does not exceed 3.4 A. The 3.4 A current rating is the limiting factor. Verify your actual operating current against this specification. Mechanically, both parts share identical nonstandard package dimensions and should occupy the same board space.

Q: What is the primary difference between the two substitute options?

A: HRSPD127-183M is from the same manufacturer as the original with lower current rating (3.4 A). SRR1208-180ML is from Bourns Inc. with superior electrical performance (40 mOhm DCR, 3.8 A rating) and RoHS3 compliance, but has slightly larger physical dimensions and narrower low-temperature operating range (-40°C vs. -55°C).

Q: Are the substitute parts physically interchangeable on the PCB?

A: Both substitute parts are surface mount with nonstandard packages. HRSPD127-183M shares the exact footprint (12.00mm x 12.00mm nominal). SRR1208-180ML is slightly larger (12.70mm x 12.70mm). Verify available board space and component clearances, particularly height (8.00mm original, 8.50mm for SRR1208-180ML, 9.02mm for HRSPD127-183M).

Q: What happens if my circuit requires the full -55°C minimum operating temperature?

A: Only the SPD127-183M and HRSPD127-183M support -55°C operation. The SRR1208-180ML minimum operating temperature is -40°C. If -55°C operation is required, select HRSPD127-183M, provided the 3.4 A current rating meets your application needs.

Q: Which substitute part should I select for new designs?

A: Selection depends on three factors: (1) actual circuit current requirement relative to 3.4 A or 3.8 A ratings, (2) minimum operating temperature requirement (-40°C vs. -55°C), and (3) PCB layout constraints relative to footprint dimensions. The SRR1208-180ML offers superior electrical characteristics and environmental compliance for applications meeting its temperature and current specifications.

Q: Are there compliance or environmental differences between these parts?

A: SRR1208-180ML is ROHS3 compliant; SPD127-183M and HRSPD127-183M are RoHS non-compliant. All three share EAR99 ECCN classification and are REACH unaffected. If RoHS3 compliance is required for your application, SRR1208-180ML is the only option among these substitutes.