DR127-681 Equivalent & Substitute Parts Reference

Part Overview

The DR127-681 is a 680 µH shielded drum core wirewound inductor manufactured by Eaton Electronics Division, rated for 760 mA continuous current with 1.08Ω DC resistance. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is designed for surface mount applications in nonstandard package configurations.

Substiute Parts

DR127-681

Eaton - Electronics DivisionIn Stock: 1057DR127-681 Datasheet

Current PartRFQ

DR127-681-R

Eaton - Electronics DivisionIn Stock: 4040DR127-681-R Datasheet

DirectRFQ

B82477G4684M000

EPCOS - TDK ElectronicsIn Stock: 2365B82477G4684M000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DR127-681 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Inductance value: 680 µH (±20% tolerance band)
• Core type: Ferrite shielded drum core
• Mounting configuration: Surface mount, nonstandard package
• Inductance test frequency: 100 kHz
• Operating temperature range: Minimum -40°C to 125°C coverage

Secondary Compatibility Parameters:

• Current rating: Minimum 760 mA continuous
• DC resistance: Within acceptable circuit performance limits
• Saturation current: Minimum 1.39 A

Substitute parts are classified into two categories:

Direct Equivalent (Packaging Variant): DR127-681-R maintains identical electrical specifications and physical dimensions, differing only in packaging format (Tape & Reel versus bulk).

Functional Equivalent (Parameter Tolerance): B82477G4684M000 meets the primary inductance and core material criteria with allowable variations in current rating (680 mA vs. 760 mA) and DC resistance (1.24Ω vs. 1.08Ω), within the ±20% inductance tolerance band and compatible temperature range (-55°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

DR127-681-R (Direct Equivalent - Recommended Primary Choice)

The DR127-681-R is the direct electrical and mechanical equivalent of the obsolete DR127-681, manufactured by the same supplier (Eaton Electronics Division). This part maintains identical inductance, current rating, DC resistance, and physical dimensions. The primary distinction is packaging format (Tape & Reel versus bulk). DR127-681-R holds active product status and achieves ROHS3 compliance, addressing regulatory requirements for new designs and procurement. With 4009 units in stock, supply continuity is established. This part is suitable for direct substitution in all applications where the original DR127-681 was specified.

B82477G4684M000 (Functional Equivalent - Secondary Option)

The B82477G4684M000, manufactured by EPCOS (TDK Electronics), provides functional equivalence when DR127-681-R availability is constrained. This part maintains the 680 µH inductance value, ferrite shielded drum core construction, and surface mount configuration. The current rating is reduced to 680 mA (versus 760 mA), and DC resistance increases to 1.24Ω maximum (versus 1.08Ω). The saturation current is 0.780 A (versus 1.39 A). These parameter variations remain within the ±20% inductance tolerance specification and are acceptable for applications where the circuit design margin accommodates the reduced current capacity and increased resistance. Operating temperature range extends to -55°C, providing enhanced low-temperature performance. Physical dimensions increase marginally (12.80 × 12.80 mm versus 12.50 × 12.50 mm), requiring verification of PCB layout compatibility. B82477G4684M000 is ROHS3 compliant and actively manufactured.

Frequently Asked Questions (FAQ)

Q: Can DR127-681-R be used as a direct replacement for DR127-681?

A: Yes. DR127-681-R is electrically and mechanically identical to DR127-681. The only difference is packaging format (Tape & Reel versus bulk). All electrical parameters, physical dimensions, and performance characteristics are equivalent. DR127-681-R is the recommended substitution path.

Q: What are the limitations of using B82477G4684M000 as a substitute?

A: B82477G4684M000 has three parameter differences: (1) Current rating is 680 mA versus 760 mA, reducing available current margin by 80 mA; (2) DC resistance is 1.24Ω maximum versus 1.08Ω, increasing resistive losses by approximately 15%; (3) Saturation current is 0.780 A versus 1.39 A, reducing saturation margin. These variations are within the ±20% inductance tolerance band but require circuit analysis to confirm acceptable performance in the target application.

Q: Are there physical compatibility concerns with B82477G4684M000?

A: B82477G4684M000 dimensions are 12.80 × 12.80 mm (height 8.00 mm) versus DR127-681 dimensions of 12.50 × 12.50 mm (height 8.00 mm). The 0.30 mm increase in length and width is marginal but requires PCB layout verification to ensure no mechanical interference with adjacent components or board edge clearances.

Q: What is the significance of the RoHS compliance difference?

A: DR127-681 is RoHS non-compliant, while both DR127-681-R and B82477G4684M000 are ROHS3 compliant. For new designs or applications subject to RoHS regulations (EU Directive 2011/65/EU and amendments), only the compliant substitutes are acceptable. For legacy system repairs or non-regulated applications, RoHS status is not a functional constraint.

Q: How do I determine which substitute is appropriate for my application?

A: Use DR127-681-R as the primary choice for all new procurement and design updates. This part is electrically identical, actively manufactured, and RoHS compliant. Use B82477G4684M000 only when DR127-681-R is unavailable and circuit analysis confirms that the reduced current rating (680 mA), increased DC resistance (1.24Ω), and reduced saturation current (0.780 A) do not compromise circuit performance or safety margins.

Q: What is the inventory status for these parts?

A: DR127-681-R has 4009 units in stock (active product). B82477G4684M000 has 2296 units in stock (active product). The original DR127-681 has 1022 units in stock but is obsolete and should not be specified for new designs.

Q: Are there any REACH or ECCN restrictions on these parts?

A: Both DR127-681-R and B82477G4684M000 are REACH Unaffected and classified as EAR99 for export control purposes. No additional regulatory restrictions apply beyond standard RoHS compliance.