DR127-821 Equivalent & Substitute Parts

Part Overview

The DR127-821 is a 820 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 650 mA continuous current with 1.47Ω DC resistance. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and maintenance applications. The part operates across the temperature range of -40°C to 125°C and is designed for surface mount assembly in nonstandard package configurations.

Key Parameters

Parameter	Value
Inductance	820 µH
Inductance Tolerance	±20%
Current Rating	650 mA
Saturation Current (Isat)	1.27 A
DC Resistance (DCR)	1.47 Ω
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Surface Mount
Physical Dimensions	12.50 mm × 12.50 mm × 8.00 mm (max height)
Operating Temperature Range	-40°C to 125°C
Test Frequency	100 kHz

Substitute Part Grouping Explanation

Substitution eligibility for the DR127-821 is determined by strict equivalence across the following critical parameters:

Inductance Value: 820 µH with ±20% tolerance
Current Rating: 650 mA minimum continuous current capacity
Saturation Current: 1.27 A minimum
DC Resistance: 1.47 Ω
Core Type: Ferrite shielded drum core
Mounting: Surface mount configuration
Physical Envelope: 12.50 mm × 12.50 mm footprint with 8.00 mm maximum seated height
Temperature Range: -40°C to 125°C operation

The DR127-821-R qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility. The primary distinction is product status (active versus obsolete) and packaging format (Tape & Reel versus standard packaging).

Parameter Comparison

Parameter	DR127-821	DR127-821-R	Match
Inductance	820 µH	820 µH	✓
Inductance Tolerance	±20%	±20%	✓
Current Rating (Amps)	650 mA	650 mA	✓
Saturation Current (Isat)	1.27 A	1.27 A	✓
DC Resistance (DCR)	1.47 Ω	1.47 Ω	✓
Core Material	Ferrite	Ferrite	✓
Shielding	Shielded	Shielded	✓
Mounting Type	Surface Mount	Surface Mount	✓
Physical Dimensions	12.50 mm × 12.50 mm	12.50 mm × 12.50 mm	✓
Height - Seated (Max)	8.00 mm	8.00 mm	✓
Operating Temperature	-40°C to 125°C	-40°C to 125°C	✓
Inductance Test Frequency	100 kHz	100 kHz	✓
Product Status	Obsolete	Active	Substitute Available
RoHS Compliance	Non-compliant	ROHS3 Compliant	Improved
Packaging	Standard	Tape & Reel (TR)	Different

Engineering Selection Recommendations

The DR127-821-R is the direct functional equivalent of the obsolete DR127-821. Selection of the DR127-821-R is supported by the following engineering criteria:

Product Status: The DR127-821-R maintains active product status with Eaton - Electronics Division, ensuring continued availability and supply chain reliability. The original DR127-821 is classified as obsolete, creating supply risk for new production and field replacements.

Regulatory Compliance: The DR127-821-R achieves ROHS3 compliance, whereas the DR127-821 is non-compliant. For applications subject to RoHS directives or customer compliance requirements, the DR127-821-R satisfies regulatory obligations.

Electrical Equivalence: All critical electrical parameters—inductance, current rating, saturation current, and DC resistance—are identical between the two parts. No circuit redesign or performance degradation results from substitution.

Mechanical Compatibility: Physical dimensions, mounting type, and thermal operating range are identical, enabling direct PCB layout compatibility without redesign.

Packaging Consideration: The DR127-821-R is supplied in Tape & Reel format, which is standard for automated assembly operations. If bulk or alternative packaging is required, this must be confirmed with the supplier.

Frequently Asked Questions (FAQ)

Q: Can the DR127-821-R be used as a direct replacement for the DR127-821 in existing designs?

A: Yes. The DR127-821-R is electrically and mechanically equivalent to the DR127-821 across all specified parameters. No circuit modifications are required. The parts are pin-compatible and footprint-compatible for surface mount assembly.

Q: What is the primary reason to transition from DR127-821 to DR127-821-R?

A: The DR127-821 is obsolete, creating supply discontinuity. The DR127-821-R is an active product with confirmed availability. Additionally, the DR127-821-R achieves ROHS3 compliance, whereas the original part does not.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts specify identical inductance (820 µH ±20%), current rating (650 mA), saturation current (1.27 A), and DC resistance (1.47 Ω). Performance in circuit operation is equivalent.

Q: Does the Tape & Reel packaging of the DR127-821-R affect compatibility?

A: No. Tape & Reel is a supply format for automated pick-and-place assembly. The component itself is identical. If alternative packaging is required, contact the supplier to confirm availability.

Q: What are the critical parameters that must match for substitution?

A: Inductance value (820 µH), inductance tolerance (±20%), current rating (650 mA), saturation current (1.27 A), DC resistance (1.47 Ω), core material (ferrite), shielding (shielded), and physical dimensions (12.50 mm × 12.50 mm × 8.00 mm max height) must all match exactly.

Q: Is the DR127-821-R suitable for the full operating temperature range of the original part?

A: Yes. The DR127-821-R operates across -40°C to 125°C, identical to the DR127-821 specification.

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