SD12-470-R Equivalent & Substitute Parts

Part Overview

The SD12-470-R is a 47 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 428 mA continuous current with a DC resistance of 1.37 Ohm and operates across the temperature range of -40°C to 85°C. The part is RoHS compliant and carries an MSL rating of 1 (Unlimited). As an active product with 4900 pieces in stock, equivalent alternatives may be required for design flexibility, supply chain optimization, or specific application requirements where alternative electrical or mechanical parameters are acceptable within system tolerances.

Substiute Parts

SD12-470-R

Eaton - Electronics DivisionIn Stock: 4956SD12-470-R Datasheet

Current PartRFQ

SRR4011-470YL

Bourns Inc.In Stock: 1728SRR4011-470YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD12-470-R with the SRR4011-470YL is based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Inductance value: 47 µH (identical)
• Core type: Ferrite drum core, wirewound (identical)
• Shielding: Shielded construction (identical)
• Mounting: Surface mount (identical)
• Test frequency: 100 kHz (identical)
• Package classification: Nonstandard (identical)
• RoHS compliance: Both parts meet RoHS requirements

Acceptable Parameter Variations:

• Current rating: 428 mA (SD12-470-R) vs. 480 mA (SRR4011-470YL) — substitute provides higher current capacity
• Saturation current: 391 mA vs. 400 mA — substitute provides higher saturation margin
• DC resistance: 1.37 Ohm vs. 1.25 Ohm Max — substitute provides lower resistance
• Tolerance: ±20% vs. ±30% — substitute has wider tolerance
• Operating temperature: -40°C to 85°C vs. -40°C to 125°C — substitute supports extended upper temperature range
• Physical dimensions: 5.20mm x 5.20mm x 1.20mm vs. 4.80mm x 4.80mm x 1.30mm — minor footprint and height differences

The SRR4011-470YL maintains the same inductance specification and core technology while offering improved electrical performance characteristics and extended thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: SD12-470-R

The SD12-470-R remains the primary selection when the original design specifications require the tighter ±20% inductance tolerance and the -40°C to 85°C operating temperature range is sufficient for the application. This part is actively manufactured by Eaton and maintains RoHS compliance with unlimited moisture sensitivity rating.

Substitute Part: SRR4011-470YL

The SRR4011-470YL from Bourns Inc. is a qualified substitute when the following conditions are met:

• The application can accommodate the wider ±30% inductance tolerance
• The extended operating temperature range to 125°C provides system benefit
• The lower DC resistance (1.25 Ohm Max vs. 1.37 Ohm) is compatible with circuit design
• The higher current rating (480 mA vs. 428 mA) and saturation current (400 mA vs. 391 mA) do not create design conflicts
• The minor footprint reduction (5.20mm to 4.80mm) and height increase (1.20mm to 1.30mm) are acceptable for PCB layout

Both parts maintain identical RoHS and MSL compliance, ferrite core construction, shielding, surface mount packaging, and 100 kHz test frequency specifications. The SRR4011-470YL is actively manufactured by Bourns with 1715 pieces in stock inventory.

Frequently Asked Questions (FAQ)

Q: Can the SRR4011-470YL be used as a direct replacement for the SD12-470-R?

A: The SRR4011-470YL is electrically and mechanically compatible as a substitute when the application tolerates the parameter variations listed in the Parameter Comparison table. The wider inductance tolerance (±30% vs. ±20%) and extended temperature range are the primary differences. PCB layout must accommodate the slightly smaller footprint (4.80mm vs. 5.20mm) and marginally increased height (1.30mm vs. 1.20mm).

Q: What is the impact of the lower DC resistance in the SRR4011-470YL?

A: The SRR4011-470YL has a maximum DC resistance of 1.25 Ohm compared to 1.37 Ohm in the SD12-470-R. Lower DC resistance reduces resistive losses and heat generation in the inductor. This is a beneficial characteristic that does not create compatibility issues; however, circuit designs that depend on the specific resistance value of the original part should be evaluated.

Q: Are there temperature-related constraints for substitution?

A: The SD12-470-R operates from -40°C to 85°C, while the SRR4011-470YL extends to 125°C. If the application requires operation above 85°C, the SRR4011-470YL provides extended thermal capability. If the application operates only within the -40°C to 85°C range, both parts are suitable.

Q: How do the physical dimensions affect PCB design?

A: The SD12-470-R measures 5.20mm x 5.20mm x 1.20mm (L x W x Height), while the SRR4011-470YL measures 4.80mm x 4.80mm x 1.30mm. The substitute is slightly smaller in footprint but marginally taller. PCB layout must be verified to ensure the height increase does not create clearance conflicts with adjacent components or solder mask patterns.

Q: What is the significance of the inductance tolerance difference?

A: The SD12-470-R carries ±20% tolerance, while the SRR4011-470YL carries ±30% tolerance. In applications where inductance value is critical to circuit performance (such as resonant frequency calculations or filter designs), the tighter tolerance of the original part may be required. Applications with broader tolerance margins can accommodate the substitute.

Q: Are both parts RoHS compliant?

A: Yes. The SD12-470-R is RoHS Compliant, and the SRR4011-470YL is ROHS3 Compliant. Both meet current RoHS requirements and carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no special moisture handling is required during storage or assembly.

Q: What is the current rating difference and when does it matter?

A: The SD12-470-R is rated for 428 mA continuous current with 391 mA saturation current. The SRR4011-470YL is rated for 480 mA continuous current with 400 mA saturation current. The substitute provides higher current capacity. If the circuit operates at or near the original part's current rating, the substitute provides additional margin. If the circuit operates well below these ratings, the difference is not significant.