OX121K Equivalent & Substitute Parts

Part Overview

The OX121K is a 120 Ohms ±10% 1W through-hole axial resistor manufactured by Ohmite, featuring ceramic composition with moisture-resistant and pulse-withstanding characteristics. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity. The OX121K operates across a temperature range of -40°C to 220°C and is suitable for applications requiring reliable axial-lead resistors in moisture-prone environments.

Substiute Parts

OX121K

OhmiteIn Stock: 823OX121K Datasheet

Current PartRFQ

OX121KE

OhmiteIn Stock: 1839OX121KE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OX121K is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute must maintain identical resistance value (120 Ohms), tolerance (±10%), power rating (1W), ceramic composition, axial package configuration, and physical dimensions (0.217" Dia x 0.650" L). The operating temperature range (-40°C ~ 220°C) and temperature coefficient (-1000 / -1600 ppm/°C) must be preserved. Features including moisture resistance and pulse withstanding capability are mandatory for functional equivalence. The OX121KE qualifies as a direct substitute based on complete alignment with these parameters.

Parameter Comparison

Engineering Selection Recommendations

The OX121KE is the direct equivalent substitute for the obsolete OX121K. Both components are manufactured by Ohmite and share identical electrical specifications and physical dimensions. The primary distinction is product status: the OX121K is obsolete while the OX121KE is active, ensuring continued availability and supply chain reliability. The OX121KE additionally provides ROHS3 compliance, offering improved environmental and regulatory alignment compared to the non-compliant OX121K. For new designs or production requiring 120 Ohms ±10% 1W axial ceramic resistors with moisture and pulse-withstanding characteristics, the OX121KE is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the OX121KE be used as a direct replacement for the OX121K in existing designs?

A: Yes. The OX121KE is electrically and mechanically identical to the OX121K. Both components have the same resistance value (120 Ohms), tolerance (±10%), power rating (1W), physical dimensions (0.217" Dia x 0.650" L), operating temperature range (-40°C ~ 220°C), and functional features (moisture resistant, pulse withstanding). No circuit modifications are required.

Q: What is the primary advantage of selecting the OX121KE over the OX121K?

A: The OX121KE is an active product with current manufacturing support, whereas the OX121K is obsolete. The OX121KE also meets ROHS3 compliance standards, providing regulatory alignment and environmental considerations not present in the non-compliant OX121K.

Q: Are the physical dimensions identical between OX121K and OX121KE?

A: Yes. Both components share identical dimensions of 0.217" Dia x 0.650" L (5.50mm x 16.50mm) in axial package configuration, ensuring compatibility with existing PCB layouts and through-hole mounting requirements.

Q: What are the key parameters that define substitution eligibility for this resistor?

A: Substitution is determined by matching resistance value (120 Ohms), tolerance (±10%), power rating (1W), ceramic composition, axial package type, physical dimensions, operating temperature range (-40°C ~ 220°C), temperature coefficient (-1000 / -1600 ppm/°C), and functional features (moisture resistance and pulse withstanding capability).

Q: Is the OX121KE available in different packaging options?

A: The OX121KE is supplied in bulk packaging. The OX121K packaging designation was not specified in available documentation.