DR74-101 Equivalent & Substitute Parts Reference

Part Overview

The DR74-101 is a 100 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 860 mA continuous current with 383 mOhm DC resistance. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across the temperature range of -40°C to 125°C and is designed for surface mount applications in nonstandard package configurations.

Due to its obsolete status, alternative components from active product lines are required to maintain supply chain reliability and ensure long-term availability for production and repair applications.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Inductance	100	µH	Critical - must match exactly
Inductance Tolerance	±20%	%	Critical - defines acceptable range
Current Rating	860	mA	Critical - minimum continuous current capability
DC Resistance (DCR)	383	mOhm	Important - affects power dissipation and circuit performance
Saturation Current (Isat)	990	mA	Important - defines maximum usable current before inductance degradation
Shielding	Shielded	-	Critical - electromagnetic interference containment
Core Material	Ferrite	-	Important - affects frequency response and thermal characteristics
Operating Temperature Range	-40°C to 125°C	°C	Important - defines environmental compatibility
Mounting Type	Surface Mount	-	Critical - assembly process compatibility
Test Frequency	100	kHz	Important - reference frequency for inductance measurement

Substitute Part Grouping Explanation

Substitution eligibility for the DR74-101 is determined by strict adherence to the following critical parameters:

Primary Matching Criteria (Non-Negotiable):

Inductance value: 100 µH (within ±20% tolerance)
Inductance test frequency: 100 kHz
Shielding: Shielded configuration required
Mounting type: Surface mount only
Current rating: Equal to or greater than 860 mA

Secondary Compatibility Criteria:

DC resistance: Lower or equal to 383 mOhm preferred; higher values acceptable if circuit design permits
Saturation current: Equal to or greater than 990 mA preferred
Operating temperature range: Must encompass -40°C to 125°C minimum
Core material: Ferrite preferred for consistency; alternative materials acceptable if electrical performance is equivalent

Acceptable Variations:

Package dimensions may vary within nonstandard classifications
RoHS compliance status may differ (original part is non-compliant; substitutes may be compliant)
Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical equivalence
Product status transition from obsolete to active is acceptable and preferred

Parameter Comparison

Parameter	DR74-101	DR74-101-R	CDRH8D43RT125NP-101MC	P1167.104NLT	SLF7045T-101MR50-PF
Manufacturer	Eaton	Eaton	Sumida America	Pulse Electronics	TDK Corporation
Inductance (µH)	100	100	100	100	100
Tolerance	±20%	±20%	±20%	±20%	±20%
Current Rating (mA)	860	860	930	630	650
Isat (mA)	990	990	1100	630	500
DCR (mOhm)	383	383	353 Max	390 Max	300 Max
Shielding	Shielded	Shielded	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite	Not specified	Ferrite
Operating Temp (°C)	-40 to 125	-40 to 125	-40 to 125	-40 to 130	-40 to 105
Test Frequency (kHz)	100	100	100	100	100
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Not For New Designs
RoHS Status	Non-compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

DR74-101-R is the primary substitute for DR74-101. This part is manufactured by the same supplier (Eaton - Electronics Division) and maintains identical electrical specifications including 100 µH inductance, 860 mA current rating, and 383 mOhm DC resistance. The part is currently in active production status with ROHS3 compliance, providing superior supply chain continuity. Inventory availability is substantial at 2452 pieces. This component requires no circuit redesign and provides drop-in compatibility.

Tier 2 - Functional Equivalents (Acceptable with Verification):

CDRH8D43RT125NP-101MC (Sumida America Components Inc.) meets all critical substitution criteria with enhanced performance characteristics. Current rating of 930 mA exceeds the original 860 mA requirement, and saturation current of 1.1 A provides additional margin. DC resistance of 353 mOhm maximum is lower than the original 383 mOhm, resulting in reduced power dissipation. Operating temperature range matches the original specification. This part is actively produced and RoHS compliant. Physical dimensions are slightly larger (8.10mm x 8.00mm vs. 7.60mm x 7.60mm), requiring verification of PCB layout compatibility.

Tier 3 - Conditional Substitutes (Application-Dependent):

P1167.104NLT (Pulse Electronics) provides 100 µH inductance with shielded wirewound construction. Current rating of 630 mA is below the original 860 mA specification, limiting this part to applications with reduced current demands. DC resistance of 390 mOhm maximum is marginally higher than the original. Operating temperature range extends to 130°C, providing enhanced thermal capability. This part is actively produced and ROHS3 compliant. Use only in circuits where continuous current does not exceed 630 mA.

SLF7045T-101MR50-PF (TDK Corporation) is classified as "Not For New Designs" and carries a current rating of 650 mA, below the original 860 mA requirement. Saturation current of 500 mA is significantly lower than the original 990 mA, restricting dynamic performance. Operating temperature range is limited to -40°C to 105°C, which does not fully cover the original -40°C to 125°C specification. This part should be used only for legacy system maintenance where no alternative exists and current demands are confirmed below 650 mA.

Frequently Asked Questions (FAQ)

Q: Can DR74-101-R be used as a direct replacement for DR74-101?

A: Yes. DR74-101-R is manufactured by Eaton - Electronics Division with identical electrical specifications: 100 µH inductance, 860 mA current rating, 383 mOhm DC resistance, and -40°C to 125°C operating range. The only differences are packaging format (Tape & Reel vs. unspecified) and product status (Active vs. Obsolete). No circuit modifications are required.

Q: What is the primary difference between the substitute parts?

A: The main differentiator is current rating. DR74-101-R and CDRH8D43RT125NP-101MC both meet or exceed the 860 mA requirement. P1167.104NLT and SLF7045T-101MR50-PF have reduced current ratings of 630 mA and 650 mA respectively, making them unsuitable for applications requiring the full 860 mA continuous current.

Q: Does physical size variation affect substitutability?

A: Physical dimensions do not affect electrical equivalence. However, PCB layout compatibility must be verified. CDRH8D43RT125NP-101MC is slightly larger (8.10mm x 8.00mm) compared to the original (7.60mm x 7.60mm). Confirm available PCB footprint space before selection.

Q: Are RoHS compliance differences significant?

A: RoHS compliance status does not affect electrical performance or substitutability. DR74-101 is RoHS non-compliant, while all substitute parts are RoHS compliant. For new designs or applications with RoHS requirements, any of the substitute parts satisfy regulatory requirements. For legacy systems without RoHS mandates, compliance status is not a limiting factor.

Q: Which substitute part has the lowest DC resistance?

A: SLF7045T-101MR50-PF has the lowest DC resistance at 300 mOhm maximum, compared to the original 383 mOhm. However, this part is classified as "Not For New Designs" and has a reduced current rating of 650 mA. CDRH8D43RT125NP-101MC offers a practical balance with 353 mOhm maximum resistance and 930 mA current rating while maintaining active production status.

Q: Can P1167.104NLT be used in high-current applications?

A: No. P1167.104NLT has a current rating of 630 mA and saturation current of 630 mA, both below the original 860 mA specification. Use this part only in applications confirmed to operate below 630 mA continuous current. For applications requiring the full 860 mA capability, select DR74-101-R or CDRH8D43RT125NP-101MC.

Q: What is the operating temperature limitation of SLF7045T-101MR50-PF?

A: SLF7045T-101MR50-PF operates from -40°C to 105°C, which does not fully cover the original -40°C to 125°C range. This part cannot be used in applications requiring operation above 105°C. For full temperature range compatibility, select DR74-101-R, CDRH8D43RT125NP-101MC, or P1167.104NLT.

Q: Is core material consistency important for substitution?

A: All substitute parts except P1167.104NLT specify ferrite core material, matching the original DR74-101. P1167.104NLT does not specify core material but is confirmed as a wirewound shielded inductor. Core material consistency is preferred but not a limiting factor if electrical performance parameters are met.

Q: What inventory considerations should guide part selection?

A: SLF7045T-101MR50-PF has the highest inventory availability at 165,200 pieces, but is classified as "Not For New Designs." DR74-101-R has 2,452 pieces in stock and is actively produced, making it the preferred choice for ongoing procurement. CDRH8D43RT125NP-101MC has 803 pieces available. P1167.104NLT has 9,657 pieces in stock. Inventory levels should be balanced against electrical suitability and product status.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message