DRA127-330-R Equivalent & Substitute Parts

Part Overview

The DRA127-330-R is a 33 µH shielded wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 3.22 A continuous current with a saturation current of 6.22 A and features a DC resistance of 60 mOhm. The part is AEC-Q200 qualified, ROHS3 compliant, and maintains active product status with substantial inventory availability (28,460 pieces in stock). Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements where the primary part may be unavailable or where alternative electrical characteristics better suit specific circuit demands.

Key Parameters

Parameter	Value	Unit
Inductance	33	µH
Inductance Tolerance	±20%	—
Current Rating (Continuous)	3.22	A
Current - Saturation (Isat)	6.22	A
DC Resistance (DCR)	60	mOhm
Shielding	Shielded	—
Operating Temperature Range	-40 to 165	°C
Mounting Type	Surface Mount	—
Package Footprint	12.50 x 12.50	mm
Height (Seated Max)	8.00	mm
Ratings	AEC-Q200	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the DRA127-330-R is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Inductance value: 33 µH (fixed requirement)
Inductance tolerance: ±20% (fixed requirement)
Shielding: Shielded (electromagnetic containment requirement)
Mounting type: Surface Mount (PCB assembly compatibility)
Package footprint: 12.50 x 12.50 mm (land pattern compatibility)
AEC-Q200 qualification (automotive-grade reliability standard)
ROHS3 compliance (environmental and regulatory requirement)

Secondary Compatibility Parameters:

Current rating: Minimum 3.22 A continuous (functional requirement)
DC resistance: Comparable to 60 mOhm (thermal and efficiency consideration)
Operating temperature range: Must support -40°C minimum and preferably 165°C maximum
Saturation current: Must exceed application peak current demands

The three substitute parts listed (B82477P4333M000, SRR1280A-330M, CDRH125L125NP-330MC) meet the primary substitution criteria. Secondary parameter variations exist and are documented in the comparison table to enable application-specific selection.

Parameter Comparison

Parameter	DRA127-330-R (Eaton)	B82477P4333M000 (EPCOS/TDK)	SRR1280A-330M (Bourns)	CDRH125L125NP-330MC (Sumida)
Inductance	33 µH	33 µH	33 µH	33 µH
Tolerance	±20%	±20%	±20%	±20%
Current Rating	3.22 A	3.35 A	3.5 A	3.0 A
Saturation Current (Isat)	6.22 A	3.5 A	3.3 A	2.93 A
DC Resistance (DCR)	60 mOhm	52 mOhm Max	57 mOhm Max	59 mOhm Max
Shielding	Shielded	Shielded	Shielded	Shielded
Operating Temperature	-40 to 165°C	-55 to 150°C	-40 to 125°C	-40 to 125°C
Package Footprint	12.50 x 12.50 mm	12.50 x 12.50 mm	12.50 x 12.50 mm	12.00 x 12.00 mm
Height (Seated Max)	8.00 mm	8.50 mm	8.00 mm	6.00 mm
AEC-Q200	Yes	Yes	Yes	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory Status	28,460 Pcs	1,566 Pcs	4,094 Pcs	915 Pcs

Engineering Selection Recommendations

DRA127-330-R (Primary Selection) Select this part when maximum saturation current (6.22 A) is required and the upper operating temperature limit of 165°C is necessary. This part offers the highest current handling capability among the four options and is available in the largest quantity (28,460 pieces), supporting high-volume production schedules.

B82477P4333M000 (EPCOS/TDK Electronics) This substitute provides the lowest DC resistance (52 mOhm maximum) among all options, resulting in reduced power dissipation and improved thermal efficiency. The extended low-temperature rating (-55°C) supports applications requiring enhanced cold-temperature performance. The slightly increased height (8.50 mm) must be verified against PCB clearance constraints. Select this part when thermal efficiency and low-temperature operation are prioritized.

SRR1280A-330M (Bourns Inc.) This substitute matches the primary part's height (8.00 mm) and operating temperature minimum (-40°C). The DC resistance (57 mOhm maximum) is comparable to the primary part. This option provides balanced performance across electrical and mechanical parameters. Select this part when direct mechanical compatibility with the primary part is required and saturation current requirements are below 3.3 A.

CDRH125L125NP-330MC (Sumida America Components Inc.) This substitute features the lowest profile height (6.00 mm), enabling use in space-constrained applications. The smaller footprint (12.00 x 12.00 mm) requires PCB land pattern modification. The current rating (3.0 A) is lower than the primary part, and saturation current (2.93 A) is the lowest among all options. Select this part only when vertical space is severely limited and application current demands do not exceed 3.0 A continuous.

All four parts maintain AEC-Q200 qualification, ROHS3 compliance, and MSL 1 rating, confirming suitability for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can DRA127-330-R be directly replaced with CDRH125L125NP-330MC without PCB modification?

A: No. The CDRH125L125NP-330MC has a smaller footprint (12.00 x 12.00 mm) compared to the DRA127-330-R (12.50 x 12.50 mm). PCB land pattern modification is required. Additionally, the lower current rating (3.0 A) and saturation current (2.93 A) must be verified against circuit requirements.

Q: Which substitute part has the best thermal performance?

A: The B82477P4333M000 offers the lowest DC resistance at 52 mOhm maximum, resulting in the lowest resistive power dissipation (I²R losses) among all options. This translates to reduced heat generation and improved thermal efficiency in the inductor.

Q: Are all substitute parts qualified to the same automotive standard?

A: Yes. All four parts (DRA127-330-R, B82477P4333M000, SRR1280A-330M, and CDRH125L125NP-330MC) carry AEC-Q200 qualification, confirming compliance with automotive-grade reliability and quality standards.

Q: What is the impact of different saturation current ratings on circuit performance?

A: Saturation current (Isat) defines the maximum current level before the inductor's inductance value degrades significantly. The DRA127-330-R (6.22 A Isat) supports higher peak currents than B82477P4333M000 (3.5 A), SRR1280A-330M (3.3 A), and CDRH125L125NP-330MC (2.93 A). Applications with peak currents exceeding a substitute part's Isat rating will experience inductance collapse and circuit malfunction.

Q: Can substitute parts be used in applications requiring the full -40°C to 165°C temperature range?

A: No. The B82477P4333M000 is rated to 150°C maximum, and both SRR1280A-330M and CDRH125L125NP-330MC are rated to 125°C maximum. Only the DRA127-330-R supports the full 165°C upper limit. For applications requiring operation above 150°C, the primary part is mandatory.

Q: How do DC resistance differences affect circuit design?

A: DC resistance values range from 52 mOhm (B82477P4333M000) to 60 mOhm (DRA127-330-R). At 3.22 A continuous current, resistive losses range from approximately 0.54 W to 0.62 W. In high-current or thermally sensitive applications, the lower DCR of the B82477P4333M000 reduces heat generation and improves efficiency.

Q: Are all parts available in the same packaging format?

A: Yes. All four parts are supplied in Tape & Reel (TR) packaging, supporting automated assembly processes. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, eliminating bake-out requirements prior to assembly.

Q: What is the significance of the ±20% inductance tolerance?

A: The ±20% tolerance indicates that actual inductance values may range from 26.4 µH to 39.6 µH. Circuit designs must accommodate this tolerance range. All four parts share this tolerance specification, ensuring consistent performance variation across the product family.

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