RJ-4EW504 Equivalent & Substitute Parts

Part Overview

The RJ-4EW504 is a 500 kOhm, 0.5W through-hole trimmer potentiometer manufactured by Nidec Components Corporation. This cermet-based component features top adjustment with PC pin termination and is designed for applications requiring precision resistance tuning in compact form factors. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to provide design flexibility when primary inventory is unavailable or when mechanical packaging constraints require alternative form factors.

Substiute Parts

RJ-4EW504

Nidec Components CorporationIn Stock: 1126RJ-4EW504 Datasheet

Current PartRFQ

72PR500KLF

TT Electronics/BIIn Stock: 204372PR500KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RJ-4EW504 is determined by strict equivalence across the following critical parameters:

• Resistance value: 500 kOhms (exact match required)
• Power rating: 0.5W / 1/2W (exact match required)
• Tolerance: ±10% (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Number of turns: 1 (exact match required)
• Adjustment type: Top Adjustment (exact match required)
• Resistive material: Cermet (exact match required)
• Mounting type: Through Hole (exact match required)
• Termination style: PC Pins (exact match required)
• Regulatory compliance: RoHS3 Compliant (minimum requirement)

The 72PR500KLF from TT Electronics/BI meets all electrical and functional specifications. The primary difference is mechanical packaging: the RJ-4EW504 features a round form factor (0.193" diameter), while the 72PR500KLF uses a square form factor (0.375" x 0.375" face). Both are suitable for through-hole PCB mounting with identical electrical performance.

Parameter Comparison

Engineering Selection Recommendations

Both the RJ-4EW504 and 72PR500KLF are Active products with full RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on PCB layout constraints and available board space.

The RJ-4EW504 is preferred when compact form factor is required, with its 4.90mm diameter round package occupying minimal PCB footprint. The 72PR500KLF is suitable for applications where larger mechanical envelope is acceptable or where the square form factor provides superior mechanical stability in the mounting location. Both parts deliver identical electrical performance and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 72PR500KLF be used as a direct replacement for the RJ-4EW504?

A: Yes, from an electrical and functional standpoint. Both parts are 500 kOhm, 0.5W cermet trimmer potentiometers with identical electrical specifications, tolerance, temperature coefficient, and top adjustment mechanism. The primary consideration is mechanical packaging: the 72PR500KLF has a larger square footprint (9.53mm x 9.53mm) compared to the RJ-4EW504's round form factor (4.90mm diameter). PCB layout must accommodate this difference.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution requires exact matching of: resistance value (500 kOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1), adjustment type (top adjustment), resistive material (cermet), mounting type (through hole), and termination style (PC pins). Both parts meet these criteria.

Q: Are there compliance or regulatory differences between these parts?

A: No. Both the RJ-4EW504 and 72PR500KLF are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. Both maintain Active product status with equivalent regulatory standing.

Q: What should I consider when choosing between these two parts?

A: The primary selection criterion is available PCB space. If your design requires a compact footprint, the RJ-4EW504's 4.90mm round package is optimal. If your PCB layout can accommodate a larger component or if the square form factor provides mechanical advantages for your application, the 72PR500KLF is equally suitable. Electrical performance is identical between both options.