ST-42ETA503 Equivalent & Substitute Parts

Part Overview

The ST-42ETA503 is a 50 kOhm surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This 0.25W cermet trimmer features J lead termination with top adjustment and is designed for applications requiring precision resistance tuning 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 requirements.

Substiute Parts

ST-42ETA503

Nidec Components CorporationIn Stock: 1075ST-42ETA503 Datasheet

Current PartRFQ

23AR50KLFTR

TT Electronics/BIIn Stock: 248323AR50KLFTR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ST-42ETA503 are qualified based on the following critical parameters:

• Electrical Specifications: Resistance value (50 kOhms), power rating (0.25W), tolerance (±20%), and temperature coefficient (±100ppm/°C) must be identical
• Mechanical Compatibility: Mounting type (surface mount), termination style (J lead), adjustment type (top adjustment), and physical dimensions (5.00mm x 4.50mm face) must match exactly
• Material Composition: Resistive material must be cermet with single-turn configuration
• Compliance & Packaging: RoHS compliance status and tape & reel packaging format must be maintained
• Environmental Rating: MSL 1 (unlimited) moisture sensitivity level must be preserved

The 23AR50KLFTR from TT Electronics/BI meets all these criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the ST-42ETA503 and 23AR50KLFTR are active production components with full compliance certifications. The ST-42ETA503 maintains RoHS3 compliance, while the 23AR50KLFTR carries RoHS compliance. Both parts satisfy environmental and regulatory requirements for industrial and commercial applications. Selection between these parts may be based on supply chain availability, lead time, or procurement preferences, as all electrical, mechanical, and environmental specifications are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 23AR50KLFTR be used as a direct replacement for the ST-42ETA503?

A: Yes. Both parts share identical electrical specifications (50 kOhms, 0.25W, ±20% tolerance, ±100ppm/°C), mechanical dimensions (5.00mm x 4.50mm), mounting configuration (surface mount J lead), and environmental ratings (MSL 1). No circuit modifications or PCB layout changes are required.

Q: Are there differences in RoHS compliance between these parts?

A: The ST-42ETA503 carries RoHS3 certification, while the 23AR50KLFTR carries RoHS compliance. Both meet current environmental regulations for restricted substances. Application requirements should determine which certification level is necessary.

Q: Do both parts use the same packaging format?

A: Yes. Both the ST-42ETA503 and 23AR50KLFTR are supplied in tape & reel (TR) packaging, ensuring compatibility with automated assembly processes and identical handling requirements.

Q: What are the key parameters that determine substitutability for this trimmer potentiometer?

A: Substitutability is determined by matching resistance value, power rating, tolerance, temperature coefficient, number of turns, adjustment type, resistive material composition, mounting type, termination style, physical dimensions, and environmental ratings. All these parameters must align exactly between the original and substitute part.

Q: Are there any inventory considerations when selecting between these parts?

A: The ST-42ETA503 has 1018 pieces in stock, while the 23AR50KLFTR has 2378 pieces available. Inventory levels may influence procurement decisions based on project timelines and volume requirements.