SRP1040-470M Equivalent & Substitute Parts

Part Overview

The SRP1040-470M is a 47 µH shielded inductor manufactured by Bourns Inc., rated for 2 A continuous current with 160mOhm maximum DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The SRP1040-470M operates across the temperature range of -55°C to 150°C and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). The part is tested at 100 kHz inductance frequency and features a nonstandard surface mount package measuring 11.80mm × 10.50mm × 4.20mm (max height).

Substiute Parts

SRP1040-470M

Bourns Inc.In Stock: 974SRP1040-470M Datasheet

Current PartRFQ

DRA124-470-R

Eaton - Electronics DivisionIn Stock: 1276DRA124-470-R Datasheet

SimilarRFQ

IDC5020ER470M

Vishay DaleIn Stock: 1247IDC5020ER470M Datasheet

SimilarRFQ

P0751.473NL

Pulse ElectronicsIn Stock: 4025P0751.473NL Datasheet

SimilarRFQ

P0751.473NLT

Pulse ElectronicsIn Stock: 2368P0751.473NLT Datasheet

SimilarRFQ

UP2B-470-R

Eaton - Electronics DivisionIn Stock: 1340UP2B-470-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SRP1040-470M is determined by the following critical parameters:

• Inductance Value: 47 µH (±20% tolerance)
• Current Rating: Minimum 2 A continuous
• DC Resistance: Maximum 160 mOhm
• Saturation Current (Isat): Minimum 3 A
• Shielding Configuration: Shielded
• Operating Temperature Range: Must encompass -55°C to 150°C or be compatible with application requirements
• Mounting Type: Surface Mount
• RoHS Compliance: RoHS3 Compliant

The substitute parts identified meet the core electrical specifications (inductance, current rating, and DC resistance) but vary in shielding configuration, temperature range, and saturation current characteristics. Selection depends on application-specific electromagnetic interference (EMI) requirements and thermal constraints.

Parameter Comparison

Engineering Selection Recommendations

DRA124-470-R (Eaton - Electronics Division) is the primary substitute for shielded applications. It maintains shielded configuration, operates across -40°C to 165°C, and is actively manufactured. Current rating of 1.78 A is below the original 2 A specification; saturation current of 2.91 A is below the original 3 A. This part is suitable where the 2 A continuous current requirement can be reduced or where thermal headroom exists.

IDC5020ER470M (Vishay Dale) and UP2B-470-R (Eaton - Electronics Division) are unshielded alternatives with lower DC resistance (140 mOhm and 138.8 mOhm respectively). These parts are appropriate for applications where EMI shielding is not critical. IDC5020ER470M operates to 125°C; UP2B-470-R operates to 85°C. Both have reduced current ratings and saturation currents relative to the original specification.

P0751.473NL and P0751.473NLT (Pulse Electronics) are unshielded wirewound inductors with 1.6 A current rating and 168 mOhm DC resistance. These parts operate to 130°C and are available in both bulk and tape & reel packaging. Current and saturation ratings are the lowest among substitute options.

All substitute parts are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity). Selection should prioritize active product status and compliance with application thermal and current requirements.

Frequently Asked Questions (FAQ)

Q: Can DRA124-470-R directly replace SRP1040-470M in all applications?

A: DRA124-470-R maintains shielded configuration and similar DC resistance but has reduced current rating (1.78 A vs. 2 A) and saturation current (2.91 A vs. 3 A). Substitution is valid only if the application current demand does not exceed 1.78 A continuous or 2.91 A saturation.

Q: What is the difference between shielded and unshielded inductors in substitution?

A: Shielded inductors (SRP1040-470M, DRA124-470-R) contain electromagnetic shielding to minimize radiated EMI and external field coupling. Unshielded inductors (IDC5020ER470M, P0751.473NL, P0751.473NLT, UP2B-470-R) lack this shielding. Substitution from shielded to unshielded requires verification that EMI performance remains acceptable for the application.

Q: Why do substitute parts have lower current ratings than the original?

A: Substitute parts employ different core materials and winding configurations. Lower current ratings reflect different thermal and saturation characteristics. Applications must be re-evaluated to confirm that reduced current capacity is acceptable.

Q: Are P0751.473NL and P0751.473NLT interchangeable?

A: Both parts are electrically identical 47 µH inductors from Pulse Electronics with identical electrical specifications. P0751.473NL is supplied in bulk packaging; P0751.473NLT is supplied in tape & reel (TR) packaging. Selection depends on assembly process requirements.

Q: What is the impact of operating temperature range differences?

A: The original SRP1040-470M operates from -55°C to 150°C. Substitute parts operate within narrower ranges (-40°C to 165°C for DRA124-470-R; -40°C to 125°C for IDC5020ER470M; -40°C to 130°C for Pulse Electronics parts; -40°C to 85°C for UP2B-470-R). Applications requiring operation below -40°C or above the substitute part's maximum temperature cannot use these alternatives.

Q: How does DC resistance affect inductor substitution?

A: DC resistance determines power dissipation and thermal rise. The original part specifies 160 mOhm maximum. Substitute parts range from 134 mOhm to 168 mOhm. Lower resistance reduces losses; higher resistance increases losses. Applications with tight thermal budgets should prioritize lower DCR alternatives.