SPD127-474M Equivalent & Substitute Parts

Part Overview

The SPD127-474M is a 470 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 800 mA with a maximum DC resistance of 980 mOhm. This component is classified as obsolete, making identification of suitable equivalent parts essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard 12.00mm x 12.00mm package.

Substiute Parts

SPD127-474M

API Delevan Inc.In Stock: 707SPD127-474M Datasheet

Current PartRFQ

HRSPD127-474M

API Delevan Inc.In Stock: 964HRSPD127-474M Datasheet

DirectRFQ

SRR1208-471KL

Bourns Inc.In Stock: 3061SRR1208-471KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD127-474M is determined by the following critical parameters: inductance value (470 µH), shielding requirement (shielded), core material (ferrite), mounting type (surface mount), and operating temperature compatibility. The substitute parts must maintain the same inductance specification and shielding characteristics. Current rating, DC resistance, and package dimensions are secondary considerations that may vary within acceptable engineering tolerances for the application.

The two identified substitute parts are categorized as follows:

Direct Manufacturer Substitute (HRSPD127-474M): Same manufacturer (API Delevan Inc.), same inductance, same shielding, active product status.

Cross-Manufacturer Equivalent (SRR1208-471KL): Different manufacturer (Bourns Inc.), same inductance, same shielding, active product status, improved compliance profile.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-474M is the direct manufacturer equivalent from API Delevan Inc. with active product status. This part offers improved current rating (830 mA vs. 800 mA), lower DC resistance (800 mOhm vs. 980 mOhm), and extended upper operating temperature (130°C vs. 125°C). The package dimensions are nearly identical (12.07mm vs. 12.00mm), with a slightly increased height (9.02mm vs. 8.00mm). This substitute is suitable for applications where the original SPD127-474M is no longer available and the minor dimensional increase is acceptable.

SRR1208-471KL is a cross-manufacturer equivalent from Bourns Inc. with active product status and ROHS3 compliance. This part provides tighter inductance tolerance (±10% vs. ±20%), higher saturation current (950 mA vs. not specified), and improved regulatory compliance. The current rating is lower (700 mA vs. 800 mA), which may limit suitability for applications requiring the full 800 mA specification. Package dimensions are slightly larger (12.70mm x 12.70mm), and the lower operating temperature minimum (-40°C vs. -55°C) may restrict use in extreme cold environments.

Selection between these substitutes depends on application-specific requirements for current capacity, temperature range, compliance certifications, and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-474M directly replace SPD127-474M in all applications?

A: HRSPD127-474M maintains the same inductance (470 µH), shielding, core material, and mounting type as SPD127-474M. The primary differences are improved electrical performance (higher current rating, lower DCR) and slightly increased package height (9.02mm vs. 8.00mm). Verify that the additional 1.02mm height does not conflict with PCB layout or enclosure constraints before substitution.

Q: What are the limitations of SRR1208-471KL as a substitute?

A: SRR1208-471KL has a lower current rating (700 mA) compared to SPD127-474M (800 mA). Applications requiring the full 800 mA specification cannot use this part. Additionally, the minimum operating temperature is -40°C rather than -55°C. The package footprint is also larger (12.70mm x 12.70mm). However, this part offers ROHS3 compliance and tighter inductance tolerance (±10%).

Q: Are there mechanical compatibility concerns with these substitutes?

A: All three parts are surface mount inductors with nonstandard packages. HRSPD127-474M has nearly identical dimensions (12.07mm vs. 12.00mm footprint) with a 1.02mm height increase. SRR1208-471KL has a larger footprint (12.70mm x 12.70mm) and may require PCB layout modifications. Verify clearance with surrounding components and thermal management requirements before implementation.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For maximum electrical performance and temperature range compatibility, HRSPD127-474M is preferred. For regulatory compliance and tighter tolerance requirements, SRR1208-471KL is suitable if the 700 mA current rating and -40°C minimum temperature are acceptable.

Q: What is the inductance tolerance impact of these substitutes?

A: SPD127-474M and HRSPD127-474M both have ±20% tolerance. SRR1208-471KL offers tighter ±10% tolerance, which may improve circuit performance in applications sensitive to inductance variation. All three parts are tested at different frequencies (SPD127-474M and SRR1208-471KL at 1 kHz; HRSPD127-474M at 10 kHz), which may affect measured inductance values depending on circuit operating frequency.