ST4TA203 Equivalent & Substitute Parts

Part Overview

The ST4TA203 is a 20 kOhms surface mount trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based trimmer features 0.25W power rating, 1.0 turn top adjustment, and J lead termination in a rectangular 5.00mm x 4.50mm package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring this specific resistance value and electrical performance.

Substiute Parts

ST4TA203

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 837ST4TA203 Datasheet

Current PartRFQ

23AR20KLFTR

TT Electronics/BIIn Stock: 886623AR20KLFTR Datasheet

MFR RecommendedRFQ

ST-42ETA203

Nidec Components CorporationIn Stock: 1077ST-42ETA203 Datasheet

MFR RecommendedRFQ

ST-4ETA203

Nidec Components CorporationIn Stock: 24249ST-4ETA203 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ST4TA203 is determined by strict equivalence across all critical electrical and mechanical parameters. The following criteria establish valid substitutes:

• 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)
• Adjustment type: Top Adjustment (exact match required)
• Resistive material: Cermet (exact match required)
• Mounting type: Surface Mount (exact match required)
• Termination style: J Lead (exact match required)
• Package dimensions: Rectangular - 0.197" x 0.177" Face / 5.00mm x 4.50mm (exact match required)
• Moisture sensitivity level: 1 (Unlimited) (exact match required)

All three substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the ST4TA203.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts provide full electrical and mechanical compatibility with the ST4TA203. Selection should be based on product status and regulatory compliance requirements:

The 23AR20KLFTR (TT Electronics/BI) is RoHS Compliant and maintains active production status, making it suitable for applications requiring current RoHS certification.

The ST-42ETA203 (Nidec Components Corporation) is ROHS3 Compliant with active product status and represents an alternative from a different manufacturer within the Nidec portfolio.

The ST-4ETA203 (Nidec Components Corporation) is ROHS3 Compliant, maintains active production status, and offers the highest inventory availability (24,172 pcs), making it the most readily available option for immediate procurement.

All three substitutes carry identical REACH and ECCN classifications (REACH Unaffected, EAR99) as the original part.

Frequently Asked Questions (FAQ)

Q: Can the ST4TA203 be directly replaced with any of these substitute parts?

A: Yes. All three substitute parts are electrically and mechanically equivalent to the ST4TA203. They share identical resistance, power rating, tolerance, temperature coefficient, number of turns, adjustment type, resistive material, mounting type, termination style, and package dimensions.

Q: What is the primary reason for substitution?

A: The ST4TA203 is obsolete. The three active substitute parts provide continued access to equivalent 20 kOhms surface mount trimmer potentiometers with identical electrical and mechanical specifications.

Q: Are there packaging differences between the main part and substitutes?

A: The ST4TA203 is supplied in standard packaging. The 23AR20KLFTR and both Nidec parts (ST-42ETA203 and ST-4ETA203) are supplied in Tape & Reel (TR) packaging, which is standard for surface mount components and compatible with automated assembly processes.

Q: Do the substitutes meet current regulatory requirements?

A: Yes. The 23AR20KLFTR is RoHS Compliant. The ST-42ETA203 and ST-4ETA203 are both ROHS3 Compliant. All three are REACH Unaffected and classified as EAR99 for export control purposes, matching the original part's regulatory classification.

Q: Which substitute offers the best availability?

A: The ST-4ETA203 (Nidec Components Corporation) has the highest inventory availability at 24,172 pcs in stock, followed by the 23AR20KLFTR at 8,784 pcs, and the ST-42ETA203 at 1,020 pcs.

Q: Are there any electrical performance differences between the substitutes?

A: No. All three substitutes maintain identical electrical specifications: 20 kOhms resistance, ±20% tolerance, ±100ppm/°C temperature coefficient, and 0.25W power rating.