3386T-1-503 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The 3386T-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer manufactured by Bourns Inc. under the Trimpot® 3386 series. This sealed cermet trimmer features top adjustment, PC pin termination, and a square 0.375" x 0.375" form factor. The part is currently active in production. Equivalent and substitute parts are identified when designs require alternative sourcing, inventory availability, form factor variations, or compliance requirements.

Substiute Parts

3386T-1-503

Bourns Inc.In Stock: 10613386T-1-503 Datasheet

Current PartRFQ

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

Substitution eligibility for the 3386T-1-503 is determined by matching the following core electrical and mechanical 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 are grouped into two categories:

Category A: Direct Form Factor Match (Top Adjustment, Square 0.375" x 0.375")

• 72PR50KLF (TT Electronics/BI Series 72): Identical electrical specifications and square form factor. Packaging differs (Bulk vs. Tube). RoHS3 compliant.

Category B: Electrical Match with Form Factor Variation

• 25PR50KLF (TT Electronics/BI Series 25): Matches all electrical parameters. Smaller square form factor (0.270" x 0.270"). RoHS compliant. Tube packaging.
• 82PR50KLF (TT Electronics/BI Series 82): Matches all electrical parameters. Round form factor (0.250" Dia). RoHS3 compliant. Bulk packaging.

Category C: Adjustment Type Variation

• M63P503KB40 (Vishay Spectrol Series 63): Matches all electrical parameters. Side adjustment instead of top adjustment. Square form factor (0.395" x 0.395"). RoHS3 compliant. Bulk packaging.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement with identical form factor and adjustment orientation: Select 72PR50KLF. This part maintains the square 0.375" x 0.375" footprint and top adjustment configuration of the 3386T-1-503. RoHS3 compliance provides regulatory advantage over the original part's non-compliant status.

For space-constrained applications: The 25PR50KLF offers a smaller square footprint (0.270" x 0.270") while preserving all electrical specifications and top adjustment. RoHS compliance is standard. This option is suitable when PCB real estate is limited.

For circular mounting requirements: The 82PR50KLF provides a round form factor (0.250" Dia) with identical electrical performance and top adjustment. RoHS3 compliance is included. This option accommodates circular mounting patterns or space optimization in specific layouts.

For side-access adjustment applications: The M63P503KB40 is the only substitute with side adjustment capability. The larger square footprint (0.395" x 0.395") accommodates the side-mounted adjustment mechanism. RoHS3 compliance is provided. This option is necessary when top-mounted adjustment is not accessible in the final assembly.

All substitute parts maintain the 50 kOhm resistance, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 1-turn operation, cermet construction, through-hole mounting, and PC pin termination of the original 3386T-1-503.

Frequently Asked Questions (FAQ)

Q: Can 25PR50KLF be used as a direct replacement for 3386T-1-503 on existing PCBs? A: No. The 25PR50KLF has a smaller square footprint (0.270" x 0.270") compared to the 3386T-1-503 (0.375" x 0.375"). PCB layout modifications are required. Electrical performance is identical.

Q: What is the primary difference between 72PR50KLF and 3386T-1-503? A: Electrical and mechanical specifications are identical. The 72PR50KLF is RoHS3 compliant, whereas the 3386T-1-503 is non-compliant. Packaging differs (Bulk vs. Tube).

Q: Is M63P503KB40 compatible with designs requiring top adjustment? A: No. The M63P503KB40 features side adjustment, not top adjustment. This part is suitable only for applications where side-mounted adjustment access is available and acceptable.

Q: Can 82PR50KLF replace 3386T-1-503 in applications with square mounting patterns? A: The 82PR50KLF has a round form factor (0.250" Dia), not square. It is suitable for circular mounting patterns or applications where round geometry is required. Square mounting patterns require 72PR50KLF or 25PR50KLF.

Q: Are all substitute parts RoHS compliant? A: The 25PR50KLF is RoHS compliant. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are RoHS3 compliant. The original 3386T-1-503 is RoHS non-compliant.

Q: Do all substitute parts have the same temperature coefficient? A: Yes. All substitute parts maintain ±100ppm/°C temperature coefficient, matching the 3386T-1-503.

Q: What packaging options are available for these substitutes? A: The 3386T-1-503 and 25PR50KLF are supplied in Tube packaging. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in Bulk packaging.