DR1040-221-R Equivalent & Substitute Parts

Part Overview

The DR1040-221-R is a 220 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 700 mA continuous current with a maximum DC resistance of 640 mOhm and operates across the temperature range of -40°C to 125°C. The part is currently active in production and ROHS3 compliant.

Substitute parts are identified when equivalent inductance values, current ratings, shielding characteristics, and mounting specifications align within acceptable engineering tolerances. The primary substitute listed maintains the same inductance specification while offering alternative electrical performance characteristics suitable for specific application requirements.

Substiute Parts

DR1040-221-R

Eaton - Electronics DivisionIn Stock: 1177DR1040-221-R Datasheet

Current PartRFQ

SRU1038-221Y

Bourns Inc.In Stock: 15600SRU1038-221Y Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRU1038-221Y from Bourns Inc. qualifies as a substitute based on the following alignment of critical parameters:

Matching Specifications:

• Inductance: 220 µH (identical)
• Inductance Tolerance: ±30% (identical)
• Core Type: Ferrite drum core, wirewound (identical)
• Shielding: Shielded (identical)
• Mounting Type: Surface mount (identical)
• Operating Temperature Range: -40°C to 125°C (identical)
• Inductance Test Frequency: 100 kHz (identical)
• RoHS Status: ROHS3 Compliant (identical)
• Moisture Sensitivity Level: 1 - Unlimited (identical)

Differing Electrical Characteristics:

• Current Rating: 650 mA (substitute) versus 700 mA (main part)
• DC Resistance: 565 mOhm (substitute) versus 640 mOhm (main part)
• Saturation Current: 650 mA (substitute) versus 920 mA (main part)

The substitute part operates at a lower continuous current rating and exhibits lower DC resistance, making it suitable for applications where the main part's 700 mA rating exceeds circuit requirements or where reduced resistive losses are beneficial.

Parameter Comparison

Engineering Selection Recommendations

DR1040-221-R Selection Criteria:

• Applications requiring 700 mA continuous current capacity
• Designs where higher saturation current (920 mA) is necessary
• Circuits tolerating up to 640 mOhm DC resistance
• Active production status with established supply chain

SRU1038-221Y Selection Criteria:

• Applications with current requirements at or below 650 mA
• Designs benefiting from lower DC resistance (565 mOhm) to reduce power dissipation
• Circuits where saturation current of 650 mA is sufficient
• Compact PCB layouts where the smaller footprint (10.00mm x 10.00mm) provides space advantages

Both parts maintain ROHS3 compliance and identical operating temperature specifications. Selection between these parts depends on circuit current requirements and thermal management considerations rather than functional incompatibility.

Frequently Asked Questions (FAQ)

Q: Can SRU1038-221Y replace DR1040-221-R in all applications?

A: The SRU1038-221Y is suitable for applications where the circuit current does not exceed 650 mA continuous. If your design requires the full 700 mA rating or 920 mA saturation current of the DR1040-221-R, the substitute is not appropriate.

Q: What is the impact of the 75 mOhm difference in DC resistance?

A: The SRU1038-221Y exhibits 565 mOhm DCR compared to 640 mOhm for the DR1040-221-R. This 75 mOhm reduction decreases resistive power loss, which is beneficial in low-power or thermally sensitive applications. Power dissipation difference at rated current is approximately 0.03 W.

Q: Are the physical dimensions compatible on the same PCB?

A: The SRU1038-221Y (10.00mm x 10.00mm) is slightly smaller than the DR1040-221-R (10.50mm x 10.30mm). Both are nonstandard packages. Height difference is minimal (4.10mm versus 4.00mm). PCB footprint compatibility must be verified against specific design requirements.

Q: Do both parts share identical inductance specifications?

A: Yes. Both parts are specified at 220 µH with ±30% tolerance, tested at 100 kHz. Inductance values are equivalent for circuit design purposes.

Q: What compliance certifications apply to both parts?

A: Both DR1040-221-R and SRU1038-221Y are ROHS3 compliant, classified under ECCN EAR99, and carry HTSUS code 8504.50.4000. Both have Moisture Sensitivity Level 1 (Unlimited).

Q: Which part should be selected for new designs?

A: Selection depends on circuit current requirements. For designs operating at 650 mA or below, either part is acceptable. For designs requiring 700 mA continuous current or higher saturation performance, the DR1040-221-R is the appropriate choice.