ST-4ETH503 Equivalent & Substitute Parts

Part Overview

The ST-4ETH503 is a 50 kOhms 0.25W surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This Gull Wing terminated component features Cermet resistive material with side adjustment capability and is designed for applications requiring precision variable resistance in compact form factors. The part is currently Active in product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

ST-4ETH503

Nidec Components CorporationIn Stock: 1214ST-4ETH503 Datasheet

Current PartRFQ

23BR50KLFTR

TT Electronics / BI TechnologiesIn Stock: 461423BR50KLFTR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST-4ETH503 is determined by strict equivalence across the following critical parameters:

• Resistance value: 50 kOhms (exact match required)
• Power rating: 0.25W / 1/4W (exact match required)
• Tolerance: ±20% (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Number of turns: 1 (exact match required)
• Resistive material: Cermet (exact match required)
• Mounting type: Surface Mount (exact match required)
• Termination style: Gull Wing (exact match required)
• Physical dimensions: 5.00mm x 4.50mm face (exact match required)
• Packaging format: Tape & Reel (exact match required)

The 23BR50KLFTR qualifies as a substitute part because it maintains equivalence across all critical electrical and mechanical parameters. The primary difference is adjustment type (Top Adjustment vs. Side Adjustment), which represents a functional variation that does not affect electrical performance or physical compatibility in applications where adjustment method is not a design constraint.

Parameter Comparison

Engineering Selection Recommendations

Both the ST-4ETH503 and 23BR50KLFTR maintain Active product status with full regulatory compliance. Selection between these parts should be based on:

• Adjustment mechanism accessibility requirements within the application design
• Manufacturer availability and lead time considerations
• Supply chain continuity and inventory positioning
• PCB layout constraints related to adjustment access (side vs. top orientation)

Both parts satisfy RoHS3 and REACH compliance requirements. The MSL rating of 1 (Unlimited) for both components indicates no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can the 23BR50KLFTR replace the ST-4ETH503 in existing designs?

A: Yes, provided the design does not require side adjustment access. The 23BR50KLFTR uses top adjustment, which may require PCB layout modification to accommodate the adjustment screw orientation.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Resistance, power rating, tolerance, temperature coefficient, and all electrical parameters are equivalent. Both use Cermet material and maintain identical performance specifications.

Q: What is the significance of the adjustment type difference?

A: Adjustment type affects physical access to the trimmer screw during calibration and field adjustment. Side adjustment allows access from the component side; top adjustment requires access from above. This is a mechanical consideration, not an electrical one.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are RoHS compliant, REACH unaffected, and carry MSL 1 (Unlimited) ratings. The ST-4ETH503 specifies ROHS3 compliance; the 23BR50KLFTR specifies RoHS compliance. Both satisfy modern regulatory requirements.

Q: Are the physical dimensions identical?

A: Yes. Both parts have a 5.00mm x 4.50mm rectangular face and are packaged in Tape & Reel format with identical Gull Wing termination.

Q: What factors should determine which substitute to use?

A: PCB layout requirements for adjustment access, manufacturer lead time, inventory availability, and design phase constraints. Electrical performance is equivalent across both options.