DR124-102-R Equivalent & Substitute Parts Reference

Part Overview

The DR124-102-R is a 1 mH shielded drum core wirewound inductor manufactured by Eaton Electronics Division, designed for surface mount applications. This component features a 440 mA current rating, 3.477Ohm maximum DC resistance, and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are identified based on matching core electrical specifications: 1 mH inductance at 100 kHz test frequency, ±20% tolerance compatibility, shielded construction, surface mount packaging, and nonstandard case dimensions. Alternative components must maintain functional equivalence within the specified operating parameters.

Substiute Parts

DR124-102-R

Eaton - Electronics DivisionIn Stock: 1521DR124-102-R Datasheet

Current PartRFQ

P1168.105NLT

Pulse ElectronicsIn Stock: 2760P1168.105NLT Datasheet

DirectRFQ

SRR1240-102K

Bourns Inc.In Stock: 15432SRR1240-102K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DR124-102-R is determined by the following criteria:

Primary Electrical Matching:

• Inductance value of 1 mH at 100 kHz test frequency
• Tolerance of ±20% or tighter
• Shielded construction for EMI containment

Current Performance:

• Current rating of 440 mA or higher
• Saturation current (Isat) sufficient to prevent core saturation under operating conditions

Physical Compatibility:

• Surface mount technology
• Nonstandard package case with dimensions 0.492" L × 0.492" W (12.50mm × 12.50mm)
• Height seated maximum of 0.177" (4.50mm)
• Tape & Reel packaging format

Environmental & Compliance:

• Operating temperature range of -40°C to 125°C or broader
• RoHS3 compliance
• Moisture sensitivity level 1 (unlimited)

The identified substitutes meet these criteria while maintaining functional equivalence in circuit applications requiring 1 mH inductance with moderate current handling.

Parameter Comparison

Engineering Selection Recommendations

SRR1240-102K (Bourns Inc.) - Primary Substitute

The SRR1240-102K represents the closest functional equivalent to the DR124-102-R. Both components share identical physical dimensions (0.492" × 0.492" × 0.177"), ferrite drum core construction, and operating temperature range. The SRR1240-102K offers tighter inductance tolerance (±10% versus ±20%), comparable DC resistance (3 Ohm versus 3.477 Ohm), and higher saturation current (400 mA Isat). All three components maintain Active product status and full RoHS3 compliance. The SRR1240-102K is suitable for direct replacement in applications where the 420 mA current rating meets circuit requirements.

P1168.105NLT (Pulse Electronics) - Alternative Substitute

The P1168.105NLT provides an alternative with superior DC resistance performance (2.85 Ohm maximum versus 3.477 Ohm), resulting in lower power dissipation. However, this component has a reduced current rating of 400 mA and lower saturation current (400 mA Isat), making it suitable only for applications with current demands not exceeding 400 mA. Physical dimensions differ slightly (0.482" × 0.482" versus 0.492" × 0.492"), requiring PCB layout verification. The extended operating temperature range (-40°C to 130°C) provides broader environmental coverage. This substitute is appropriate for low-current applications prioritizing efficiency.

Selection Criteria:

• Use SRR1240-102K when current requirements approach or exceed 420 mA
• Use P1168.105NLT when current requirements are below 400 mA and lower DC resistance is beneficial
• Verify PCB footprint compatibility, particularly for P1168.105NLT due to dimensional variance
• All substitutes maintain regulatory compliance and moisture sensitivity specifications

Frequently Asked Questions (FAQ)

Q: Can the P1168.105NLT replace the DR124-102-R in all applications?

A: No. The P1168.105NLT has a maximum current rating of 400 mA compared to the DR124-102-R's 440 mA rating. Use P1168.105NLT only in circuits where the maximum current demand does not exceed 400 mA. Additionally, verify PCB layout compatibility due to the 0.01" (0.26mm) dimensional difference in length and width.

Q: What is the significance of the ±10% tolerance on the SRR1240-102K versus ±20% on the DR124-102-R?

A: Tighter tolerance (±10%) means the SRR1240-102K inductance value will be closer to the nominal 1 mH specification. This provides better circuit performance consistency and reduced variation between production batches. Applications requiring precise inductance values benefit from the tighter tolerance.

Q: Are all three components suitable for high-temperature applications?

A: The DR124-102-R and SRR1240-102K operate to 125°C maximum. The P1168.105NLT extends to 130°C. For applications requiring operation above 125°C, only the P1168.105NLT is suitable. For standard applications within -40°C to 125°C, all three components are equivalent.

Q: How do the DC resistance values affect circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. The P1168.105NLT (2.85 Ohm) dissipates less power than the DR124-102-R (3.477 Ohm) or SRR1240-102K (3 Ohm) at the same current level. In power-sensitive applications, the P1168.105NLT provides efficiency advantages, provided current ratings are not exceeded.

Q: Are the physical dimensions identical across all three parts?

A: No. The DR124-102-R and SRR1240-102K share identical dimensions (0.492" × 0.492" × 0.177"). The P1168.105NLT is slightly smaller (0.482" × 0.482" × 0.177"). Height is identical across all three. Verify PCB pad spacing and component placement before substituting with P1168.105NLT.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. The DR124-102-R, P1168.105NLT, and SRR1240-102K are all RoHS3 compliant with moisture sensitivity level 1 (unlimited). Regulatory compliance is maintained across all three components.

Q: What is the difference between saturation current (Isat) values?

A: Saturation current indicates the point at which the inductor core begins to saturate, reducing inductance. The DR124-102-R has 530 mA Isat, while both P1168.105NLT and SRR1240-102K have 400 mA Isat. For applications with current transients or peaks, the DR124-102-R provides greater margin before saturation occurs.

Q: Can I use these parts interchangeably in existing designs?

A: Interchangeability depends on specific circuit requirements. Verify current rating, DC resistance impact on efficiency, physical dimensions for PCB compatibility, and operating temperature range. The SRR1240-102K is the most direct replacement. The P1168.105NLT requires additional validation for current and dimensional compatibility.