DRA125-331-R Equivalent & Substitute Parts

Part Overview

The DRA125-331-R is a 330 µH shielded wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 998 mA continuous current with a DC resistance of 543 mOhm and operates across the temperature range of -40°C to 165°C. The part carries AEC-Q200 qualification and ROHS3 compliance, making it suitable for automotive and industrial applications requiring high reliability. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Inductance	330	µH
Inductance Tolerance	±20%	—
Current Rating	998	mA
DC Resistance (DCR)	543	mOhm
Saturation Current (Isat)	1.194	A
Operating Temperature Range	-40 to 165	°C
Shielding	Shielded	—
Mounting Type	Surface Mount	—
Package Size	12.50 x 12.50 x 6.00	mm
RoHS Status	ROHS3 Compliant	—
AEC-Q200 Rating	Yes	—

Substitute Part Grouping Explanation

Substitution of the DRA125-331-R is determined by the following critical parameters:

Electrical Equivalence Criteria:

Inductance value of 330 µH within ±20% tolerance band
Current rating sufficient to support 998 mA continuous operation
DC resistance compatible with circuit performance requirements
Saturation current (Isat) adequate for peak transient conditions

Mechanical Compatibility Criteria:

Surface mount package configuration
Physical dimensions within acceptable board layout constraints
Shielded construction to maintain electromagnetic isolation
Height clearance compatible with 6.00 mm maximum seated height

Compliance & Reliability Criteria:

AEC-Q200 qualification for automotive-grade reliability
ROHS3 compliance for environmental standards
Operating temperature range supporting -40°C to 165°C applications
Moisture sensitivity level MSL 1 (unlimited shelf life)

The three substitute parts listed below meet these criteria with variations in current rating, DC resistance, and operating temperature range that remain within acceptable engineering tolerances for this component category.

Parameter Comparison

Parameter	DRA125-331-R (Eaton)	SRR1260A-331K (Bourns)	B82477G4334M000 (EPCOS-TDK)	CDRH125L125NP-331MC (Sumida)
Inductance	330 µH	330 µH	330 µH	330 µH
Inductance Tolerance	±20%	±10%	±20%	±20%
Current Rating	998 mA	1.15 A	950 mA	900 mA
DC Resistance (DCR)	543 mOhm	580 mOhm Max	600 mOhm Max	674 mOhm Max
Saturation Current (Isat)	1.194 A	1.1 A	1.15 A	900 mA
Operating Temperature Range	-40 to 165°C	-40 to 125°C	-55 to 125°C	-40 to 125°C
Shielding	Shielded	Shielded	Shielded	Shielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Size (L x W)	12.50 x 12.50 mm	12.50 x 12.50 mm	12.30 x 12.30 mm	12.00 x 12.00 mm
Height (Max)	6.00 mm	6.50 mm	6.00 mm	6.00 mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q200 Rating	Yes	Yes	Not Listed	Yes
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SRR1260A-331K (Bourns Inc.) is the primary direct substitute. This part maintains 330 µH inductance with tighter ±10% tolerance, supports 1.15 A current rating (exceeding the 998 mA requirement), and carries AEC-Q200 qualification. The DC resistance of 580 mOhm Max is within acceptable range. The operating temperature maximum of 125°C represents a limitation compared to the DRA125-331-R's 165°C rating; applications requiring operation above 125°C must use the primary part or CDRH125L125NP-331MC. Physical dimensions match at 12.50 x 12.50 mm, though height increases to 6.50 mm, requiring verification of board clearance.

B82477G4334M000 (EPCOS - TDK Electronics) provides equivalent electrical performance with 330 µH inductance at ±20% tolerance and 950 mA current rating. DC resistance of 600 mOhm Max remains acceptable. This part does not carry AEC-Q200 qualification, limiting its use to non-automotive applications. Operating temperature range of -55°C to 125°C provides lower temperature capability but reduced upper limit. Physical dimensions of 12.30 x 12.30 mm and 6.00 mm height offer improved board space efficiency.

CDRH125L125NP-331MC (Sumida America Components Inc.) maintains 330 µH inductance with ±20% tolerance and AEC-Q200 qualification. Current rating of 900 mA falls below the 998 mA requirement; this part is suitable only for applications with reduced current demands. DC resistance of 674 mOhm Max represents the highest among substitutes and may impact circuit efficiency. Operating temperature range of -40°C to 125°C is equivalent to other substitutes. Physical dimensions of 12.00 x 12.00 x 6.00 mm provide the most compact footprint.

All substitute parts maintain shielded construction, surface mount configuration, ROHS3 compliance, and MSL 1 rating. Selection should prioritize application-specific requirements for current capacity, operating temperature, and automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SRR1260A-331K replace DRA125-331-R in all applications?

A: SRR1260A-331K is electrically compatible for inductance and current rating. However, the operating temperature maximum of 125°C limits use in applications requiring operation above this threshold. The DRA125-331-R supports 165°C operation. Verify application temperature requirements before substitution.

Q: What is the impact of higher DC resistance in substitute parts?

A: The DRA125-331-R has 543 mOhm DCR. Substitute parts range from 580 mOhm to 674 mOhm. Higher DC resistance increases power dissipation and heat generation. For circuits sensitive to resistive losses, measure the impact on efficiency and thermal performance. The difference is typically 7-24% higher dissipation depending on the substitute selected.

Q: Is B82477G4334M000 suitable for automotive applications?

A: B82477G4334M000 does not carry AEC-Q200 qualification. It is not recommended for automotive applications requiring this certification. Use SRR1260A-331K or CDRH125L125NP-331MC for automotive-grade reliability.

Q: What are the physical footprint differences?

A: DRA125-331-R measures 12.50 x 12.50 x 6.00 mm. SRR1260A-331K is 12.50 x 12.50 x 6.50 mm (0.5 mm taller). B82477G4334M000 is 12.30 x 12.30 x 6.00 mm (slightly smaller footprint). CDRH125L125NP-331MC is 12.00 x 12.00 x 6.00 mm (most compact). Verify board layout clearance, particularly for SRR1260A-331K due to increased height.

Q: Can CDRH125L125NP-331MC handle 998 mA continuous current?

A: CDRH125L125NP-331MC is rated for 900 mA continuous current, which is below the 998 mA requirement. This part is not suitable for applications requiring the full 998 mA rating. Use only in reduced-current applications or select SRR1260A-331K or B82477G4334M000.

Q: What is the difference between ±10% and ±20% inductance tolerance?

A: SRR1260A-331K offers ±10% tolerance, providing tighter inductance control. DRA125-331-R, B82477G4334M000, and CDRH125L125NP-331MC offer ±20% tolerance. For circuits requiring precise inductance values, SRR1260A-331K provides better tolerance performance. For general applications, ±20% tolerance is typically acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 (unlimited moisture sensitivity level), matching the environmental and reliability standards of the DRA125-331-R.

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