OA124KE Equivalent & Substitute Parts

Part Overview

The OA124KE is a 120 kOhms ±10% 1W axial through-hole resistor manufactured by Ohmite as part of the Little Demon® OA series. This carbon composition resistor features pulse withstanding capability and is classified as obsolete. Due to its obsolete status and limited modern availability compared to active alternatives, equivalent substitute parts with compatible electrical and mechanical specifications are necessary for ongoing design support and production continuity.

Substiute Parts

OA124KE

OhmiteIn Stock: 779OA124KE Datasheet

Current PartRFQ

CMF70120K00JKEA

Vishay DaleIn Stock: 1067CMF70120K00JKEA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OA124KE is determined by the following critical parameters:

• Resistance Value: 120 kOhms (exact match required)
• Package Configuration: Axial through-hole (mechanical compatibility)
• Power Rating: Minimum 1W (equal or greater acceptable)
• Tolerance: ±10% or better (tighter tolerance acceptable)
• Termination Count: 2 (standard axial configuration)

The CMF70120K00JKEA from Vishay Dale meets these substitution criteria with improved specifications: higher power rating (1.75W), tighter tolerance (±5%), and active product status with modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The CMF70120K00JKEA is suitable as a direct substitute for the OA124KE based on the following factors:

• Electrical Compatibility: Identical resistance value (120 kOhms) with superior tolerance specification (±5% vs ±10%)
• Power Capacity: Higher power rating (1.75W vs 1W) provides additional thermal margin
• Mechanical Fit: Axial package configuration maintains PCB layout compatibility; slightly smaller physical dimensions (4.57mm vs 6.00mm diameter) do not affect through-hole mounting
• Product Status: Active manufacturing status ensures long-term availability and supply chain stability
• Compliance: ROHS3 compliance and REACH affected status align with modern regulatory requirements for electronic components

The substitute part is manufactured using metal film composition rather than carbon composition, resulting in improved temperature coefficient specification and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the CMF70120K00JKEA directly replace the OA124KE in existing designs?

A: Yes. Both parts share identical resistance value (120 kOhms), axial package configuration, and 2-termination through-hole design. The substitute has equal or superior electrical specifications and maintains mechanical compatibility with standard PCB layouts.

Q: What is the difference between carbon composition and metal film resistors?

A: Carbon composition resistors (OA124KE) and metal film resistors (CMF70120K00JKEA) differ in construction and performance characteristics. Metal film resistors provide tighter tolerance (±5% vs ±10%), defined temperature coefficient (±100ppm/°C), and wider operating temperature range (-55°C ~ 175°C). Both are suitable for through-hole applications.

Q: Are there any physical dimension concerns when substituting?

A: The CMF70120K00JKEA is slightly smaller (4.57mm diameter vs 6.00mm) than the OA124KE. This reduction in physical size does not affect through-hole mounting compatibility and may provide additional PCB layout flexibility.

Q: Why is the OA124KE classified as obsolete?

A: The OA124KE is part of the Little Demon® OA series, which has been discontinued by Ohmite. Active alternatives with equivalent or superior specifications are available from current manufacturers.

Q: What packaging formats are available for the substitute part?

A: The CMF70120K00JKEA is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The original OA124KE was supplied in bulk packaging.

Q: Does the substitute part meet current regulatory compliance standards?

A: Yes. The CMF70120K00JKEA is ROHS3 compliant and REACH affected, meeting current electronic component regulatory requirements. The original OA124KE is REACH unaffected due to its obsolete status.