SD12-2R2-R Equivalent & Substitute Parts

Part Overview

The SD12-2R2-R is a 2.2 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.83 A continuous current with a DC resistance of 74.7 mOhm and operates across the temperature range of -40°C to 85°C. The part is currently active in production and RoHS compliant, making it suitable for modern electronic applications requiring compact, shielded inductive filtering or energy storage.

Equivalent and substitute parts are identified when design requirements permit tolerance in inductance value, current rating, or thermal operating range while maintaining core electrical and mechanical compatibility within the same package category and mounting type.

Substiute Parts

SD12-2R2-R

Eaton - Electronics DivisionIn Stock: 2286SD12-2R2-R Datasheet

Current PartRFQ

SRR4011-2R2YL

Bourns Inc.In Stock: 4276SRR4011-2R2YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SD12-2R2-R are identified based on the following substitution criteria:

Electrical Parameters (Primary):

• Inductance value of 2.2 µH at 100 kHz test frequency
• Current rating equal to or greater than 1.83 A
• DC resistance within acceptable range (70–80 mOhm)
• Saturation current (Isat) at or above 1.8 A
• Shielded construction with ferrite core material

Mechanical Parameters (Secondary):

• Surface mount package type
• Nonstandard case size compatible with 5.20 mm × 5.20 mm footprint or smaller equivalent
• Height seated maximum within 1.20–1.30 mm range
• Tape & Reel packaging for production compatibility

Compliance Parameters:

• RoHS compliance (RoHS 2 or RoHS 3)
• Operating temperature range of -40°C minimum and 85°C minimum maximum
• Active product status

The SRR4011-2R2YL from Bourns Inc. meets all primary electrical and mechanical criteria for substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SD12-2R2-R

The SD12-2R2-R remains the primary choice when exact specifications are required, particularly when the narrower inductance tolerance of ±20% is critical to circuit performance. The part is active in production with 2256 units in stock, ensuring supply continuity. RoHS compliance and unlimited moisture sensitivity rating support deployment in standard manufacturing environments.

Substitute Selection: SRR4011-2R2YL

The SRR4011-2R2YL from Bourns Inc. is a qualified substitute when the following conditions are met:

• Circuit design tolerates the wider ±30% inductance tolerance
• Higher current rating (2.0 A vs. 1.83 A) is acceptable or beneficial
• Extended operating temperature range (-40°C to 125°C) provides additional thermal margin
• Slightly smaller footprint (4.80 mm × 4.80 mm) is compatible with PCB layout
• ROHS3 compliance satisfies current regulatory requirements
• Supply availability of 4171 units supports production requirements

Substitution Constraints:

The SRR4011-2R2YL height of 1.30 mm (versus 1.20 mm for the SD12-2R2-R) requires verification of vertical PCB clearance in confined assemblies. Both parts maintain identical saturation current (1.8 A) and DC resistance within acceptable engineering margins. Mechanical footprint compatibility is confirmed for both parts in the nonstandard surface mount category.

Frequently Asked Questions (FAQ)

Q: Can the SRR4011-2R2YL directly replace the SD12-2R2-R in existing designs?

A: Direct substitution is possible when circuit tolerance specifications permit the wider ±30% inductance tolerance of the Bourns part. The higher current rating (2.0 A) and extended temperature range (-40°C to 125°C) provide additional design margin. Verify PCB clearance for the 1.30 mm seated height.

Q: What is the significance of the inductance tolerance difference (±20% vs. ±30%)?

A: Inductance tolerance directly affects circuit resonant frequency, filter cutoff frequency, and energy storage capacity. Applications with tight frequency or impedance requirements must use the SD12-2R2-R (±20%). Applications with broader tolerance windows can accept the SRR4011-2R2YL (±30%).

Q: Are the DC resistance values equivalent?

A: Yes. The SD12-2R2-R at 74.7 mOhm and the SRR4011-2R2YL at 75 mOhm maximum are functionally equivalent. The 0.3 mOhm difference produces negligible variation in power dissipation across the rated current range.

Q: Does the smaller footprint of the SRR4011-2R2YL affect performance?

A: No. The 4.80 mm × 4.80 mm footprint of the Bourns part is smaller than the 5.20 mm × 5.20 mm Eaton part but maintains identical electrical performance. Smaller size may provide PCB layout advantages without performance trade-offs.

Q: What is the impact of the extended temperature range in the SRR4011-2R2YL?

A: The Bourns part operates to 125°C maximum versus 85°C for the Eaton part. This extended range provides additional thermal margin in high-temperature environments but does not affect performance in applications operating within the original -40°C to 85°C specification.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both the SD12-2R2-R and SRR4011-2R2YL are supplied in Tape & Reel (TR) format, supporting automated PCB assembly processes without modification to pick-and-place equipment or tape specifications.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS compliant. The SD12-2R2-R carries RoHS 2 compliance, while the SRR4011-2R2YL carries ROHS3 compliance, representing the current regulatory standard. Both parts have Moisture Sensitivity Level 1 (Unlimited), requiring no special handling during storage or assembly.

Q: Can these parts be used interchangeably in production?

A: Interchangeability requires design review to confirm tolerance acceptance and PCB clearance verification for the 0.10 mm height difference. Once confirmed, both parts can be qualified as approved substitutes in the bill of materials with appropriate cross-reference documentation.