ST-42ETH203 Equivalent & Substitute Parts

Part Overview

The ST-42ETH203 is a 20 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-42ETH203

Nidec Components CorporationIn Stock: 827ST-42ETH203 Datasheet

Current PartRFQ

23BR20KLFTR

TT Electronics/BIIn Stock: 161723BR20KLFTR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST-42ETH203 is determined by the following critical parameters:

• Resistance value: 20 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 23BR20KLFTR from TT Electronics/BI qualifies as a substitute part because it matches all critical electrical and mechanical parameters. The primary difference is the adjustment type: the ST-42ETH203 features side adjustment, while the 23BR20KLFTR features top adjustment. This distinction does not affect electrical performance or interchangeability in applications where the adjustment mechanism accessibility differs.

Parameter Comparison

Engineering Selection Recommendations

Both the ST-42ETH203 and 23BR20KLFTR are active production components with full regulatory compliance. The ST-42ETH203 maintains RoHS3 certification, while the 23BR20KLFTR carries RoHS compliance. Both components are REACH Unaffected and carry unlimited moisture sensitivity ratings, making them suitable for standard manufacturing and storage environments.

Selection between these parts should be based on adjustment mechanism accessibility requirements within the specific application. The side adjustment feature of the ST-42ETH203 provides access from the component side, while the top adjustment of the 23BR20KLFTR provides access from the top surface. PCB layout constraints and tuning accessibility during assembly or field service may determine which adjustment type is appropriate.

Frequently Asked Questions (FAQ)

Q: Can the 23BR20KLFTR replace the ST-42ETH203 in all applications?

A: The 23BR20KLFTR is electrically and mechanically equivalent to the ST-42ETH203. The primary consideration is adjustment mechanism accessibility. If the application requires side adjustment access, the ST-42ETH203 is the correct choice. If top adjustment access is acceptable or preferred, the 23BR20KLFTR is a valid substitute.

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

A: The ST-42ETH203 carries RoHS3 certification, while the 23BR20KLFTR carries RoHS compliance. Both meet current regulatory requirements. Verify your specific application's compliance requirements before selection.

Q: Do these parts have identical physical footprints?

A: Yes. Both components share identical dimensions of 5.00mm x 4.50mm face size and gull wing termination, ensuring identical PCB footprints and reflow soldering profiles.

Q: What is the significance of the ±100ppm/°C temperature coefficient?

A: This specification indicates the resistance value will drift approximately 0.01% per degree Celsius change in operating temperature. Both parts maintain identical temperature stability characteristics.

Q: Are both parts available in tape and reel packaging?

A: Yes. Both the ST-42ETH203 and 23BR20KLFTR are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.