ST-42ETH503 Equivalent & Substitute Parts

Part Overview

The ST-42ETH503 is a 50 kOhms, 0.25W surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This Cermet-based component features gull wing termination and side adjustment capability, designed for precision tuning applications in compact form factors. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component's functional requirements.

Substiute Parts

ST-42ETH503

Nidec Components CorporationIn Stock: 792ST-42ETH503 Datasheet

Current PartRFQ

23BR50KLFTR

TT Electronics / BI TechnologiesIn Stock: 461423BR50KLFTR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST-42ETH503 is determined by 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)
• Compliance: RoHS3 and REACH Unaffected status (exact match required)

The 23BR50KLFTR from TT Electronics / BI Technologies meets all electrical and mechanical specifications. The primary difference is adjustment type: the ST-42ETH503 features side adjustment, while the 23BR50KLFTR features top adjustment. Both configurations are functionally equivalent for applications where adjustment accessibility differs.

Parameter Comparison

Engineering Selection Recommendations

Both the ST-42ETH503 and 23BR50KLFTR are active production components with full regulatory compliance. Selection between these parts depends on adjustment accessibility requirements within the application's physical layout. The ST-42ETH503 provides side adjustment access, while the 23BR50KLFTR provides top adjustment access. Both components maintain identical electrical performance, thermal stability, and environmental compliance ratings. Inventory availability should be evaluated based on procurement lead times and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the 23BR50KLFTR replace the ST-42ETH503 in all applications?

A: The 23BR50KLFTR is electrically and mechanically equivalent to the ST-42ETH503. The primary difference is adjustment orientation: side adjustment versus top adjustment. Substitution is valid when the application's physical design accommodates top adjustment access instead of side adjustment access.

Q: Are there any compliance differences between these parts?

A: Both components are RoHS compliant and REACH unaffected. The ST-42ETH503 carries RoHS3 certification, while the 23BR50KLFTR carries RoHS certification. Both meet unlimited moisture sensitivity requirements (MSL 1).

Q: What determines if a trimmer potentiometer can substitute for the ST-42ETH503?

A: Substitution requires exact matching of resistance (50 kOhms), power rating (0.25W), tolerance (±20%), temperature coefficient (±100ppm/°C), number of turns (1), resistive material (Cermet), mounting type (surface mount), termination style (gull wing), and physical dimensions (5.00mm x 4.50mm). Adjustment type may differ based on application requirements.

Q: Is the physical footprint identical between these parts?

A: Yes. Both components share the same rectangular face dimensions of 0.197" x 0.177" (5.00mm x 4.50mm), ensuring identical PCB layout compatibility.

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

A: Adjustment type refers to the physical location of the tuning mechanism. Side adjustment allows access from the component's side edge, while top adjustment allows access from the component's top surface. Selection depends on the available space and accessibility requirements in the final assembly.