Bourns 3540S-1-503 Wirewound Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3540S-1-503 is a 50kΩ 2W wirewound linear potentiometer designed for panel mount applications with a 10-turn adjustment mechanism and solder lug termination. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support, maintenance, and design continuity. Direct substitutes maintain identical electrical and mechanical specifications while offering improved compliance status and active product availability.

Substiute Parts

3540S-1-503

Bourns Inc.In Stock: 10313540S-1-503 Datasheet

Current PartRFQ

3540S-1-503L

Bourns Inc.In Stock: 11523540S-1-503L Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3540S-1-503 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part 3540S-1-503L maintains identical specifications in resistance value, power rating, taper characteristic, number of turns, tolerance, temperature coefficient, resistive material composition, termination style, mounting configuration, bushing thread specification, body dimensions, actuator type, and rotation angle. These parameters define functional interchangeability at the circuit and mechanical interface level.

The primary distinction between the main part and its substitute lies in product status, packaging format, and regulatory compliance certifications rather than functional performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 3540S-1-503L is the direct functional equivalent of the 3540S-1-503 and is recommended for new designs and component replacement applications. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

For applications subject to RoHS3 compliance requirements, the 3540S-1-503L satisfies regulatory mandates, whereas the original 3540S-1-503 does not. Similarly, applications requiring REACH compliance documentation should specify the 3540S-1-503L.

Both parts share identical electrical performance characteristics, mechanical dimensions, and interface specifications. Selection between these parts should be based on regulatory compliance requirements, supply availability, and packaging format preferences rather than functional performance considerations.

Frequently Asked Questions (FAQ)

Q: Can the 3540S-1-503L be used as a direct replacement for the 3540S-1-503?

A: Yes. All electrical parameters (resistance, power rating, tolerance, temperature coefficient, taper) and mechanical specifications (mounting type, bushing thread, body dimensions, actuator type) are identical. The parts are functionally interchangeable at the circuit and mechanical interface level.

Q: What is the primary difference between these two part numbers?

A: The 3540S-1-503L is an active production variant with ROHS3 compliance certification and tray packaging, whereas the 3540S-1-503 is obsolete and RoHS non-compliant. Electrical and mechanical performance are equivalent.

Q: Does packaging format affect electrical performance?

A: No. The tray packaging of the 3540S-1-503L provides improved handling and storage characteristics but does not alter the component's electrical or mechanical properties.

Q: Are there any compliance considerations when substituting these parts?

A: Yes. If your application or end-market requires RoHS3 compliance, the 3540S-1-503L is the appropriate selection. The original 3540S-1-503 does not meet this requirement. REACH compliance status also differs between the two parts.

Q: What are the critical parameters that define substitution eligibility?

A: Resistance value (50kΩ), power rating (2W), taper type (linear), number of turns (10), tolerance (±5%), temperature coefficient (±50ppm/°C), resistive material (wirewound), termination style (solder lug), mounting type (panel mount), bushing thread (3/8-32), and body dimensions (0.875" diameter) must remain constant for functional equivalence.