ST3TA503 Equivalent & Substitute Parts

Part Overview

The ST3TA503 is a 50 kOhms surface mount trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based trimmer features 0.125W power rating, ±20% tolerance, and top adjustment capability with J lead termination. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

ST3TA503

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1171ST3TA503 Datasheet

Current PartRFQ

3313J-1-503E

Bourns Inc.In Stock: 101923313J-1-503E Datasheet

MFR RecommendedRFQ

ST-32ETA503

Nidec Components CorporationIn Stock: 9417ST-32ETA503 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST3TA503 is determined by strict equivalence across the following critical parameters: resistance value (50 kOhms), power rating (0.125W), 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), and moisture sensitivity level (MSL 1). Both identified substitutes—3313J-1-503E and ST-32ETA503—satisfy these core electrical and mechanical requirements. Dimensional variations exist within acceptable tolerances for the product category, with the 3313J-1-503E maintaining rectangular geometry (4.60mm x 3.20mm) identical to the original part, while the ST-32ETA503 features square geometry (3.40mm x 3.40mm). Both substitutes are active products with current RoHS3 compliance, addressing the obsolescence status of the original part.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts provide direct functional equivalence to the ST3TA503 across all critical electrical parameters. The 3313J-1-503E (Bourns Trimpot® 3313 - Sealed) maintains identical rectangular footprint geometry and is recommended for designs requiring zero layout modification. The ST-32ETA503 (Nidec ST-32 series) offers an active alternative with square geometry that accommodates minor PCB layout adjustments. Both substitutes carry ROHS3 compliance, addressing regulatory requirements that the original obsolete part does not meet. Selection between the two substitutes should be based on PCB layout constraints and preferred supplier qualification status.

Frequently Asked Questions (FAQ)

Q: Can the 3313J-1-503E and ST-32ETA503 be used interchangeably with the ST3TA503?

A: Both parts satisfy the core electrical and mechanical substitution criteria: 50 kOhms resistance, 0.125W power rating, ±20% tolerance, ±100ppm/°C temperature coefficient, 1-turn top adjustment, cermet material, surface mount J lead termination, and MSL 1 rating. The 3313J-1-503E maintains identical rectangular dimensions (4.60mm x 3.20mm), enabling direct PCB substitution. The ST-32ETA503 features square geometry (3.40mm x 3.40mm), requiring layout verification for pad compatibility.

Q: What is the primary reason for substitution?

A: The ST3TA503 is classified as obsolete. Both recommended substitutes are active products with current manufacturing support and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Q: Are there packaging differences between the original and substitutes?

A: The ST3TA503 packaging specification is not provided in the original documentation. Both substitutes are supplied in Tape & Reel (TR) packaging, standard for surface mount trimmer potentiometers in production environments.

Q: Do dimensional differences affect circuit performance?

A: The electrical performance is determined by resistance, power rating, tolerance, and temperature coefficient—all identical across the three parts. Dimensional differences (rectangular vs. square geometry) are mechanical considerations affecting PCB layout only and do not impact electrical function.

Q: What compliance certifications apply to the substitutes?

A: Both the 3313J-1-503E and ST-32ETA503 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The original ST3TA503 is RoHS non-compliant, making the substitutes necessary for new designs subject to RoHS directives.