RJS125 Equivalent & Substitute Parts

Part Overview

The RJS125 is a 125 Ohm, 50W wirewound linear potentiometer manufactured by Ohmite, designed for panel mount applications with solder lug termination. This component is classified as Active product status with 1150 units currently in stock. The RJS125 operates with a 300° rotation angle, 1-turn configuration, and ±10% resistance tolerance, making it suitable for precision control applications requiring high power dissipation in a compact round form factor (2.310" diameter).

Substitute parts become necessary when the primary part reaches end-of-life status, inventory depletion, or when design requirements mandate compliance with specific regulatory standards such as RoHS certification.

Substiute Parts

RJS125

OhmiteIn Stock: 1223RJS125 Datasheet

Current PartRFQ

RJS125E

OhmiteIn Stock: 857RJS125E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RJS125 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part RJS125E maintains identical specifications for resistance value, power rating, taper characteristic, number of turns, resistive material composition, termination method, mounting configuration, rotation angle, tolerance band, body dimensions, bushing thread specification, and actuator geometry.

The primary distinction between RJS125 and RJS125E is regulatory compliance status: RJS125E achieves RoHS3 compliance and REACH Unaffected designation, whereas the RJS125 is classified as RoHS non-compliant. Both parts are manufactured by Ohmite within the J series and carry Active product status.

Parameter Comparison

Engineering Selection Recommendations

The RJS125E serves as a direct electrical and mechanical equivalent to the RJS125, with full interchangeability in circuit design and physical installation. Selection between these parts should be based on regulatory compliance requirements and supply chain considerations.

For applications subject to RoHS3 directives or REACH compliance mandates, the RJS125E is the appropriate selection. For legacy systems or applications without regulatory compliance requirements, the RJS125 remains functionally equivalent with higher current inventory availability (1150 units versus 801 units).

Both parts maintain Active product status from Ohmite, ensuring continued manufacturing support and supply chain stability. The identical electrical specifications (125 Ohm resistance, 50W power rating, ±10% tolerance, linear taper, wirewound construction) and mechanical dimensions (2.310" round body, 3/8-32 bushing thread, flatted actuator) guarantee drop-in replacement capability without circuit redesign or mechanical modification.

Frequently Asked Questions (FAQ)

Q: Can RJS125E replace RJS125 in existing designs? A: Yes. The RJS125E is electrically and mechanically identical to the RJS125. All electrical parameters (resistance, power rating, tolerance, taper) and mechanical dimensions (body size, bushing thread, actuator specifications) are equivalent, enabling direct substitution without design modification.

Q: What is the primary difference between RJS125 and RJS125E? A: The RJS125E achieves RoHS3 compliance and carries REACH Unaffected designation, while the RJS125 is classified as RoHS non-compliant. Electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns with panel mount installation? A: No. Both parts feature identical panel mount configurations with 3/8-32 bushing thread and 2.310" diameter round body, ensuring identical mounting hole requirements and mechanical fit.

Q: Which part should be selected for new designs? A: For new designs, RJS125E is the appropriate selection due to RoHS3 compliance, ensuring alignment with current regulatory standards and long-term supply chain viability.

Q: Are the solder lug terminations identical between both parts? A: Yes. Both RJS125 and RJS125E utilize identical solder lug termination style, requiring no modification to PCB layout or soldering procedures.

Q: What is the significance of the 300° rotation angle? A: The 300° rotation angle specifies the mechanical travel range of the potentiometer shaft. Both parts provide identical rotation characteristics for control applications requiring this specific adjustment range.