SD12-3R3-R Equivalent & Substitute Parts

Part Overview

The SD12-3R3-R is a 3.3 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is designed for applications requiring fixed inductance with moderate current handling capability. The part is classified as Active product status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified when original inventory becomes unavailable or when design requirements permit alternative specifications within acceptable electrical and mechanical tolerances.

Substiute Parts

SD12-3R3-R

Eaton - Electronics DivisionIn Stock: 994SD12-3R3-R Datasheet

Current PartRFQ

SRR4011-3R3YL

Bourns Inc.In Stock: 3704SRR4011-3R3YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SD12-3R3-R with the SRR4011-3R3YL is permissible based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Inductance value: Both parts rated at 3.3 µH
• Core type: Both utilize ferrite drum core construction
• Shielding: Both are shielded designs
• Mounting: Both are surface mount components
• Inductance test frequency: Both measured at 100 kHz
• Packaging: Both supplied in Tape & Reel format
• RoHS compliance: Both meet environmental standards
• Moisture sensitivity: Both rated MSL 1 (Unlimited)

Acceptable Variance Parameters:

• Current rating: SD12-3R3-R rated 1.55 A; SRR4011-3R3YL rated 1.6 A (higher rating acceptable for substitution)
• DC resistance: SD12-3R3-R 104.3 mOhm; SRR4011-3R3YL 110 mOhm Max (within acceptable tolerance band)
• Saturation current: SD12-3R3-R 1.42 A; SRR4011-3R3YL 1.4 A (comparable performance)
• Operating temperature: SD12-3R3-R -40°C ~ 85°C; SRR4011-3R3YL -40°C ~ 125°C (extended range acceptable)
• Physical dimensions: Minor variations in length, width, and height within surface mount package constraints

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (SD12-3R3-R): The SD12-3R3-R remains the primary component choice when available. This part carries Active product status from Eaton - Electronics Division with RoHS compliance and established supply chain documentation.

Substitute Selection (SRR4011-3R3YL): The SRR4011-3R3YL from Bourns Inc. is an acceptable substitute when the primary part is unavailable. This part meets all critical electrical specifications and carries ROHS3 compliance with extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). The slightly higher DC resistance (110 mOhm Max versus 104.3 mOhm) and broader inductance tolerance (±30% versus ±20%) remain within acceptable engineering margins for equivalent circuit performance. Physical dimensions are comparable with minor variations suitable for standard surface mount assembly processes.

Both parts are classified as Active products with unlimited moisture sensitivity rating, ensuring long-term availability and reliability in production environments.

Frequently Asked Questions (FAQ)

Q: Can the SRR4011-3R3YL directly replace the SD12-3R3-R in existing designs?

A: Yes. Both parts share identical inductance values (3.3 µH), ferrite core construction, shielding, and surface mount packaging. Electrical performance remains equivalent within specified tolerances. Physical dimensions show minor variations (SD12-3R3-R: 5.20mm x 5.20mm x 1.20mm height; SRR4011-3R3YL: 4.80mm x 4.80mm x 1.30mm height) that are accommodated by standard PCB layout practices.

Q: What are the key differences in electrical performance?

A: The SRR4011-3R3YL provides higher current rating (1.6 A versus 1.55 A) and extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C). DC resistance is slightly higher at 110 mOhm Max compared to 104.3 mOhm. Inductance tolerance is broader at ±30% versus ±20%. These differences do not prevent functional substitution in equivalent circuit applications.

Q: Are both parts RoHS compliant?

A: Yes. The SD12-3R3-R carries RoHS Compliant certification. The SRR4011-3R3YL carries ROHS3 Compliant certification. Both meet environmental regulatory requirements for electronic component manufacturing and assembly.

Q: What is the moisture sensitivity rating for both parts?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage, handling, or assembly processes.

Q: Are there any package or tape & reel compatibility concerns?

A: Both parts are supplied in Tape & Reel (TR) packaging suitable for automated assembly equipment. Standard pick-and-place machinery accommodates both component sizes without modification.

Q: Which part should be specified for new designs?

A: The SD12-3R3-R is the primary specification for new designs. The SRR4011-3R3YL should be identified as an approved substitute in design documentation for supply chain continuity planning.