Bourns 3386Y-1-503 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3386Y-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer with top adjustment, cermet resistive element, and PC pin termination. This component is classified as Active product status. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional performance within the allowed parameter tolerances for this trimmer potentiometer category.

Substiute Parts

3386Y-1-503

Bourns Inc.In Stock: 10043386Y-1-503 Datasheet

Current PartRFQ

25PR50KLF

TT Electronics/BIIn Stock: 1166425PR50KLF Datasheet

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72PR50KLF

TT Electronics/BIIn Stock: 140172PR50KLF Datasheet

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82PR50KLF

TT Electronics/BIIn Stock: 110082PR50KLF Datasheet

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M63P503KB40

Vishay SpectrolIn Stock: 1143M63P503KB40 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3386Y-1-503 is determined by the following core parameters: 50 kOhm resistance value, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 1-turn adjustment, cermet resistive material, through-hole mounting, and PC pin termination. Substitute parts must match all electrical specifications. Mechanical variations in package size and adjustment type (top vs. side) are noted but do not disqualify functional equivalence when circuit board layout permits accommodation.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts match the core electrical specifications of the 3386Y-1-503. Selection among substitutes depends on compliance requirements and mechanical fit:

The 72PR50KLF (TT Electronics/BI) provides the closest mechanical match with identical square footprint (0.375" x 0.375") and top adjustment orientation, while offering ROHS3 compliance.

The 25PR50KLF (TT Electronics/BI) is electrically equivalent but features a smaller square footprint (0.270" x 0.270"), suitable for space-constrained applications with RoHS compliance.

The 82PR50KLF (TT Electronics/BI) maintains electrical equivalence with a round package (0.250" diameter) and ROHS3 compliance, applicable where circular mounting geometry is acceptable.

The M63P503KB40 (Vishay Spectrol) is electrically equivalent with side adjustment orientation and square footprint (0.395" x 0.395"), requiring circuit board layout accommodation for side-access adjustment and offering ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the 25PR50KLF substitute for the 3386Y-1-503 in a space-limited PCB layout? A: Yes. The 25PR50KLF matches all electrical parameters and termination style. The smaller footprint (0.270" x 0.270" vs. 0.375" x 0.375") requires verification that the reduced mounting area accommodates your circuit board hole spacing and mechanical clearance requirements.

Q: What is the primary difference between the 72PR50KLF and 82PR50KLF? A: Both are electrically identical 50 kOhm, 0.5W trimmer potentiometers with top adjustment. The 72PR50KLF has a square footprint (0.375" x 0.375"), while the 82PR50KLF has a round footprint (0.250" diameter). Selection depends on available mounting geometry on your PCB.

Q: Why is the M63P503KB40 listed as a substitute if it has side adjustment instead of top adjustment? A: The M63P503KB40 is electrically and functionally equivalent with identical resistance, power rating, tolerance, and temperature coefficient. The side adjustment orientation requires different PCB layout and access considerations. It is suitable only if your design permits side-mounted adjustment access.

Q: Are all substitute parts RoHS compliant? A: The 3386Y-1-503 is RoHS non-compliant. All listed substitutes (25PR50KLF, 72PR50KLF, 82PR50KLF, M63P503KB40) are RoHS compliant or ROHS3 compliant, providing compliance upgrade options for regulated applications.

Q: Can I use the 25PR50KLF as a direct replacement without PCB modification? A: The 25PR50KLF requires PCB hole spacing verification due to its smaller footprint. If your original PCB is designed for the 0.375" x 0.375" footprint, the 0.270" x 0.270" footprint may not align with existing holes without modification.