ST-42ETA104 Equivalent & Substitute Parts

Part Overview

The ST-42ETA104 is a 100 kOhms surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This 0.25W, 1/4W cermet trimmer features J lead termination with top adjustment capability and is designed for applications requiring precision resistance tuning in compact form factors. The part is currently active in production with 1054 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component, enabling direct replacement in circuit designs without functional compromise.

Substiute Parts

ST-42ETA104

Nidec Components CorporationIn Stock: 1142ST-42ETA104 Datasheet

Current PartRFQ

23AR100KLFTR

TT Electronics / BI TechnologiesIn Stock: 269423AR100KLFTR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST-42ETA104 is determined by strict equivalence across the following critical parameters:

• Resistance value: 100 kOhms
• Power rating: 0.25W (1/4W)
• Tolerance: ±20%
• Temperature coefficient: ±100ppm/°C
• Number of turns: 1
• Adjustment type: Top Adjustment
• Resistive material: Cermet
• Mounting type: Surface Mount
• Termination style: J Lead
• Physical dimensions: Rectangular - 0.197" x 0.177" Face (5.00mm x 4.50mm)
• Packaging format: Tape & Reel (TR)

The substitute part 23AR100KLFTR manufactured by TT Electronics / BI Technologies meets all specified electrical and mechanical parameters, enabling functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the ST-42ETA104 and 23AR100KLFTR are active production components with identical electrical specifications and mechanical form factors. Selection between these parts may be based on:

• Inventory availability: ST-42ETA104 has 1054 units in stock; 23AR100KLFTR has 2672 units in stock
• Compliance certifications: Both parts meet RoHS and REACH requirements with EAR99 export classification
• Moisture sensitivity: Both parts carry MSL 1 rating, indicating unlimited shelf life under standard storage conditions
• Manufacturing source preference: Nidec Components Corporation versus TT Electronics / BI Technologies

Frequently Asked Questions (FAQ)

Q: Can the 23AR100KLFTR directly replace the ST-42ETA104 in existing designs?

A: Yes. Both parts share identical resistance, power rating, tolerance, temperature coefficient, number of turns, adjustment type, resistive material, mounting type, termination style, and physical dimensions. Direct substitution is functionally equivalent.

Q: Are there any compliance differences between these parts?

A: Both parts are RoHS compliant, REACH unaffected, and classified as EAR99 for export purposes. The ST-42ETA104 carries ROHS3 certification while the 23AR100KLFTR carries standard RoHS certification. Both meet regulatory requirements for their respective applications.

Q: What is the significance of the J Lead termination?

A: J Lead termination provides surface mount compatibility with standard PCB assembly processes. Both parts use identical J lead configuration, ensuring mechanical and electrical compatibility with existing footprints.

Q: Does MSL 1 rating affect storage or handling?

A: MSL 1 rating indicates unlimited shelf life under standard storage conditions (23°C, 50% relative humidity). Both parts do not require special moisture control measures during storage or handling.

Q: Are the physical dimensions identical?

A: Yes. Both parts are rectangular with 0.197" x 0.177" face dimensions (5.00mm x 4.50mm), ensuring identical PCB footprint compatibility and mechanical fit.