Bourns 3386R-1-503 50kΩ Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3386R-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer with cermet resistive material, top adjustment, and PC pin termination. This sealed Trimpot® 3386 series component is classified as Active product status. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical form factors, and termination compatibility to support component sourcing flexibility and supply chain continuity.

Substiute Parts

3386R-1-503

Bourns Inc.In Stock: 10143386R-1-503 Datasheet

Current PartRFQ

3386R-1-503LF

Bourns Inc.In Stock: 10533386R-1-503LF Datasheet

DirectRFQ

25PR50KLF

TT Electronics/BIIn Stock: 1166425PR50KLF Datasheet

SimilarRFQ

72PR50KLF

TT Electronics/BIIn Stock: 140172PR50KLF Datasheet

SimilarRFQ

82PR50KLF

TT Electronics/BIIn Stock: 110082PR50KLF Datasheet

SimilarRFQ

M63P503KB40

Vishay SpectrolIn Stock: 1143M63P503KB40 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3386R-1-503 are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalent (Identical Specifications): The 3386R-1-503LF from Bourns Inc. matches all electrical parameters and physical dimensions. The primary distinction is RoHS compliance status: the 3386R-1-503LF is ROHS3 Compliant, while the original 3386R-1-503 is RoHS non-compliant.

Similar Equivalents (Matching Electrical Specifications with Form Factor Variations): Parts from TT Electronics/BI (25PR50KLF, 72PR50KLF, 82PR50KLF) and Vishay Spectrol (M63P503KB40) maintain identical electrical parameters: 50 kOhms resistance, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 1-turn adjustment, cermet material, through-hole mounting, and PC pin termination. Substitution compatibility is determined by:

• Electrical Parameters: Resistance, power rating, tolerance, temperature coefficient, number of turns, and resistive material must match exactly.
• Termination: PC pin termination is required for circuit board compatibility.
• Mounting: Through-hole mounting type is mandatory.
• Form Factor Variations: Physical dimensions and adjustment type (top vs. side) may differ while maintaining functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Enhanced Compliance: The 3386R-1-503LF is the primary substitute when RoHS3 compliance is required. This part maintains identical electrical specifications, physical dimensions, and adjustment type (top adjustment) as the original 3386R-1-503, with the distinction of ROHS3 Compliant status versus the original's RoHS non-compliant classification.

For Form Factor Constrained Applications: The 25PR50KLF (TT Electronics/BI) is suitable when board space is limited, as it maintains all electrical parameters while reducing physical footprint to 6.86mm x 6.86mm square. The 72PR50KLF preserves the original 9.53mm x 9.53mm square form factor with ROHS3 compliance. The 82PR50KLF offers a round 6.35mm diameter alternative with identical electrical specifications.

For Adjustment Type Flexibility: The M63P503KB40 (Vishay Spectrol) provides side adjustment instead of top adjustment, maintaining all electrical parameters. This substitution is applicable only when circuit board layout permits side-mounted adjustment access.

Compliance Considerations: All substitute parts listed carry either RoHS Compliant or ROHS3 Compliant status, addressing regulatory requirements where the original 3386R-1-503 (RoHS non-compliant) may not be acceptable. REACH Unaffected status is confirmed for all substitute parts except the original 3386R-1-503, which is REACH Affected.

Frequently Asked Questions (FAQ)

Q: Can the 3386R-1-503LF be used as a direct replacement for the 3386R-1-503?

A: Yes. The 3386R-1-503LF is electrically and mechanically identical to the 3386R-1-503, with matching resistance (50 kOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1), adjustment type (top), resistive material (cermet), mounting type (through hole), termination style (PC pins), and physical dimensions (9.53mm x 9.53mm square). The primary difference is RoHS compliance status.

Q: What are the key differences between the 25PR50KLF and the original 3386R-1-503?

A: The 25PR50KLF maintains all electrical specifications but differs in physical size (6.86mm x 6.86mm square versus 9.53mm x 9.53mm square) and manufacturer (TT Electronics/BI versus Bourns Inc.). Electrical parameters—resistance, power rating, tolerance, temperature coefficient, turns, adjustment type, material, mounting, and termination—are identical.

Q: Is the M63P503KB40 compatible with the 3386R-1-503 in all applications?

A: The M63P503KB40 matches all electrical specifications but features side adjustment instead of top adjustment. Compatibility depends on circuit board layout and accessibility requirements for potentiometer adjustment. Side adjustment may not be suitable for applications requiring top-mounted access.

Q: What is the significance of the different physical sizes among substitute parts?

A: Physical dimensions affect printed circuit board layout and available mounting space. The 25PR50KLF (6.86mm x 6.86mm) is the smallest option for space-constrained designs. The 72PR50KLF (9.53mm x 9.53mm square) and original 3386R-1-503 match in footprint. The 82PR50KLF (6.35mm round) and M63P503KB40 (10.03mm x 10.03mm square) offer alternative form factors. All maintain identical electrical performance regardless of size variation.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry RoHS Compliant or ROHS3 Compliant status. The original 3386R-1-503 is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes are acceptable.

Q: What packaging formats are available for these parts?

A: The 3386R-1-503 and 3386R-1-503LF are supplied in Tube packaging. The 25PR50KLF, 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in Bulk packaging. Packaging selection may affect procurement quantities and handling procedures.