DR127-102 Equivalent & Substitute Parts

Part Overview

The DR127-102 is a 1 mH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 610 mA continuous current with 1.66 Ohm DC resistance. This component is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing production requirements, design updates, and supply chain continuity where the original part is no longer available through standard distribution channels.

Key Parameters

Parameter	Value
Inductance	1 mH
Inductance Tolerance	±20%
Current Rating	610 mA
DC Resistance (DCR)	1.66 Ohm
Current - Saturation (Isat)	1.14 A
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Size	12.50mm x 12.50mm x 8.00mm (Max)
Inductance Test Frequency	100 kHz
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitute parts for the DR127-102 are selected based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Electrical Parameters:

Inductance value: 1 mH (fixed requirement)
Inductance tolerance: ±20% (fixed requirement)
Current rating: minimum 610 mA continuous
DC resistance: within acceptable operating range for the application
Saturation current: minimum 1.14 A
Core material: Ferrite (shielded)
Test frequency: 100 kHz

Mechanical Parameters:

Mounting type: Surface Mount (SMD)
Package type: Nonstandard drum core configuration
Physical dimensions: compatible with 12.50mm x 12.50mm footprint tolerance
Height: maximum 8.50mm seated height

Compliance Parameters:

RoHS compliance status
Moisture sensitivity level: MSL 1 (Unlimited)

Substitute parts are grouped into two categories: direct equivalents (identical electrical specifications with different packaging or compliance status) and functional equivalents (meeting or exceeding electrical requirements with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Inductance (mH)	Current Rating (mA)	DCR (Ohm)	Isat (mA)	Operating Temp (°C)	Size (mm)	Height Max (mm)	Product Status	RoHS Status
DR127-102	Eaton	1	610	1.66	1140	-40 ~ 125	12.50 x 12.50	8.00	Obsolete	Non-compliant
DR127-102-R	Eaton	1	610	1.66	1140	-40 ~ 125	12.50 x 12.50	8.00	Active	ROHS3 Compliant
B82477G4105M000	EPCOS - TDK	1	550	1.68 Max	650	-55 ~ 125	12.80 x 12.80	8.00	Active	ROHS3 Compliant
B82477P4105M000	EPCOS - TDK	1	600	1.38 Max	650	-55 ~ 150	12.50 x 12.50	8.50	Active	ROHS3 Compliant
B82477R4105M100	EPCOS - TDK	1	720	1.35 Max	950	-55 ~ 150	12.50 x 12.50	8.50	Active	ROHS3 Compliant
CDRH127L125NP-102MC	Sumida	1	640	1.495 Max	830	-40 ~ 125	12.00 x 12.00	8.00	Active	ROHS3 Compliant
CDRH12D78RNP-102MC	Sumida	1	520	1.458 Max	980	-40 ~ 105	12.00 x 12.00	8.00	Active	ROHS3 Compliant
CDRR127NP-102MC	Sumida	1	570	1.271	600	-40 ~ 125	12.50 x 12.50	7.85	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

DR127-102-R is the direct equivalent to DR127-102, manufactured by Eaton - Electronics Division. This part maintains identical electrical specifications (1 mH, 610 mA, 1.66 Ohm DCR) and mechanical dimensions. The primary distinction is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant). This part is suitable for direct replacement in all applications where the original DR127-102 was specified.

Functional Equivalents (Alternative Substitutes):

B82477R4105M100 (EPCOS - TDK Electronics) provides the highest current rating (720 mA) and lowest DC resistance (1.35 Ohm Max) among available substitutes, with extended operating temperature range (-55°C ~ 150°C) and AEC-Q200 automotive qualification. Physical dimensions match the original part (12.50mm x 12.50mm), though seated height is increased to 8.50mm. This part is suitable for applications requiring enhanced current capacity and temperature performance.

B82477P4105M000 (EPCOS - TDK Electronics) offers 600 mA current rating with 1.38 Ohm Max DCR and AEC-Q200 qualification. Operating temperature range extends to 150°C. Footprint matches the original part with 8.50mm seated height. This part is suitable for applications requiring improved thermal performance.

CDRH127L125NP-102MC (Sumida America Components Inc.) provides 640 mA current rating with 1.495 Ohm Max DCR and AEC-Q200 qualification. Physical footprint is reduced to 12.00mm x 12.00mm with 8.00mm seated height. This part is suitable for space-constrained applications.

CDRR127NP-102MC (Sumida America Components Inc.) offers the lowest DC resistance (1.271 Ohm) with 570 mA current rating and AEC-Q200 qualification. Footprint matches the original part (12.50mm x 12.50mm) with minimal seated height (7.85mm). This part is suitable for applications prioritizing low resistance characteristics.

B82477G4105M000 (EPCOS - TDK Electronics) provides 550 mA current rating with extended temperature range (-55°C ~ 125°C). Physical dimensions are slightly larger (12.80mm x 12.80mm). This part is suitable for low-temperature applications.

CDRH12D78RNP-102MC (Sumida America Components Inc.) is suitable only for applications where 520 mA current rating is acceptable, with operating temperature limited to -40°C ~ 105°C.

All substitute parts maintain 1 mH inductance value, ±20% tolerance, ferrite core material, shielding, and 100 kHz test frequency. All active substitutes are ROHS3 compliant and MSL 1 rated.

Frequently Asked Questions (FAQ)

Q: Can DR127-102-R be used as a direct replacement for DR127-102?

A: Yes. DR127-102-R is manufactured by the same supplier (Eaton - Electronics Division) with identical electrical specifications (1 mH, 610 mA, 1.66 Ohm DCR) and mechanical dimensions (12.50mm x 12.50mm x 8.00mm). The part is currently in active production status with ROHS3 compliance, making it the recommended direct substitute for the obsolete DR127-102.

Q: What are the key differences between the Eaton DR127-102-R and EPCOS B82477R4105M100?

A: Both parts maintain 1 mH inductance and 12.50mm x 12.50mm footprint. Key differences are: B82477R4105M100 provides higher current rating (720 mA versus 610 mA), lower DC resistance (1.35 Ohm Max versus 1.66 Ohm), higher saturation current (950 mA versus 1140 mA), extended operating temperature range (-55°C ~ 150°C versus -40°C ~ 125°C), and AEC-Q200 automotive qualification. Seated height is increased to 8.50mm. Selection depends on application requirements for current capacity and temperature performance.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original DR127-102 is RoHS non-compliant. If RoHS compliance is required for your application, any of the listed substitute parts will satisfy this requirement.

Q: What is the impact of different DC resistance values on circuit performance?

A: DC resistance affects power dissipation and voltage drop across the inductor. The original DR127-102 has 1.66 Ohm DCR. Substitutes range from 1.271 Ohm (CDRR127NP-102MC) to 1.68 Ohm Max (B82477G4105M000). Lower DCR values reduce power loss and heat generation. Selection should be based on circuit design requirements for acceptable voltage drop and thermal performance at the specified current rating.

Q: Can I use a substitute part with lower current rating than 610 mA?

A: No. The original DR127-102 is rated for 610 mA continuous current. Substitute parts with lower current ratings (B82477G4105M000 at 550 mA, CDRH12D78RNP-102MC at 520 mA) will not support the full specified current without exceeding saturation limits or causing excessive heating. Use only substitute parts with current ratings equal to or greater than 610 mA.

Q: What is the significance of saturation current (Isat) in inductor selection?

A: Saturation current represents the current level at which the inductor's inductance begins to degrade due to core saturation. The original DR127-102 has Isat of 1.14 A. Substitute parts with higher Isat values (B82477R4105M100 at 950 mA, CDRH12D78RNP-102MC at 980 mA) provide greater margin before saturation occurs. Selection should ensure Isat exceeds the maximum expected circuit current.

Q: Are there physical footprint compatibility concerns with substitute parts?

A: Most substitute parts maintain the 12.50mm x 12.50mm footprint of the original DR127-102. Exceptions are: B82477G4105M000 (12.80mm x 12.80mm), CDRH127L125NP-102MC (12.00mm x 12.00mm), and CDRH12D78RNP-102MC (12.00mm x 12.00mm). Seated height varies from 7.85mm to 8.50mm. Verify PCB layout compatibility before selecting a substitute part with different dimensions.

Q: What does AEC-Q200 qualification indicate?

A: AEC-Q200 is an automotive industry qualification standard for passive components. Parts with this certification (B82477P4105M000, B82477R4105M100, CDRH127L125NP-102MC, CDRR127NP-102MC) have undergone rigorous testing for reliability and performance in automotive applications. This qualification is not required for general industrial applications but is beneficial for automotive or high-reliability applications.

Q: Can I substitute a part with extended operating temperature range?

A: Yes, if your application does not require the full extended range. The original DR127-102 operates from -40°C to 125°C. Substitute parts with extended ranges (EPCOS parts to 150°C, some to -55°C minimum) are backward compatible for the original temperature range. Use extended-range parts only if your application requires operation outside the original -40°C ~ 125°C specification.

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