ST5TW503 Equivalent & Substitute Parts Reference

Part Overview

The ST5TW503 is a 50 kOhm, 0.25W surface mount trimmer potentiometer with Cermet resistive material, 14-turn top adjustment, and Gull Wing termination. Manufactured by Vishay Beyschlag/Draloric/BC Components, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent substitute parts with matching electrical and mechanical specifications is essential for design continuity and procurement flexibility.

Substiute Parts

ST5TW503

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1077ST5TW503 Datasheet

Current PartRFQ

ST-5ETW503

Nidec Components CorporationIn Stock: 3428ST-5ETW503 Datasheet

DirectRFQ

3269W-1-503G

Bourns Inc.In Stock: 7773269W-1-503G Datasheet

MFR RecommendedRFQ

ST-5EW503

Nidec Components CorporationIn Stock: 1037ST-5EW503 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ST5TW503 are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

• Resistance value: 50 kOhms (exact match required)
• Power rating: 0.25W / 1/4W (exact match required)
• Tolerance: ±10% (exact match required)
• Temperature coefficient: ±100ppm/°C (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: Gull Wing (exact match required)

Substitutes are grouped into two categories:

Direct Electrical & Mechanical Equivalents: Parts matching all primary parameters with identical or superior specifications (14-turn configuration, same footprint dimensions, MSL 1).

Functional Equivalents with Minor Variations: Parts meeting all critical electrical parameters but with acceptable mechanical variations (12-turn vs. 14-turn configuration, slightly different footprint dimensions within tolerance).

Parameter Comparison

Engineering Selection Recommendations

ST-5ETW503 (Nidec Components Corporation): This substitute provides the closest match to the ST5TW503. It maintains identical electrical specifications (50 kOhms, 0.25W, ±10% tolerance, ±100ppm/°C), identical mechanical configuration (14-turn, same footprint), and identical MSL rating (1). The part is currently active in production with RoHS3 compliance, offering improved environmental compliance compared to the obsolete original. Available in Tape & Reel packaging with 3390 units in stock.

ST-5EW503 (Nidec Components Corporation): This substitute is electrically and mechanically identical to ST-5ETW503 but supplied in Bulk packaging instead of Tape & Reel. It maintains all critical specifications and MSL rating (1). This option is suitable for applications where packaging format is not a constraint. 934 units currently in stock.

3269W-1-503G (Bourns Inc.): This substitute meets all critical electrical parameters (50 kOhms, 0.25W, ±10% tolerance, ±100ppm/°C) and maintains Gull Wing termination on a surface mount package. The primary variation is the 12-turn configuration versus the 14-turn original specification, resulting in different adjustment resolution. Footprint dimensions show minor variation (0.250" x 0.170" versus 0.236" x 0.169"), which may require PCB layout verification. MSL rating is 2 (1 Year), indicating higher moisture sensitivity. RoHS non-compliant status matches the original part. 709 units in stock.

Frequently Asked Questions (FAQ)

Q: Can ST-5ETW503 be used as a direct replacement for ST5TW503?

A: Yes. ST-5ETW503 matches all electrical specifications (50 kOhms, 0.25W, ±10%, ±100ppm/°C), mechanical configuration (14-turn top adjustment, Gull Wing termination), and footprint dimensions (6.00mm x 4.30mm). It is electrically and mechanically interchangeable.

Q: What is the difference between ST-5ETW503 and ST-5EW503?

A: Both parts are electrically and mechanically identical. The difference is packaging format: ST-5ETW503 is supplied in Tape & Reel (TR), while ST-5EW503 is supplied in Bulk. Select based on your assembly process requirements.

Q: Can 3269W-1-503G replace ST5TW503 in all applications?

A: 3269W-1-503G meets all critical electrical parameters but differs in turn count (12 turns versus 14 turns) and footprint dimensions (6.35mm x 4.32mm versus 6.00mm x 4.30mm). Verify that the reduced adjustment resolution and slightly larger footprint are acceptable for your specific application and PCB layout.

Q: Why does 3269W-1-503G have MSL 2 instead of MSL 1?

A: MSL 2 indicates a 1-year moisture sensitivity level, compared to MSL 1 (unlimited) for the other substitutes. This means 3269W-1-503G requires more careful handling and storage to prevent moisture absorption. Verify that your supply chain and storage conditions support MSL 2 requirements.

Q: Are all substitutes RoHS compliant?

A: ST-5ETW503 is RoHS3 compliant. ST-5EW503 compliance status is not specified in available data. 3269W-1-503G is RoHS non-compliant, matching the original ST5TW503. Verify RoHS compliance requirements for your application before selection.

Q: What inventory levels are available for each substitute?

A: ST-5ETW503 has 3390 units in stock, ST-5EW503 has 934 units, and 3269W-1-503G has 709 units. Confirm current availability with your supplier before finalizing procurement decisions.