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

Part Overview

The Bourns 3386M-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

3386M-1-503

Bourns Inc.In Stock: 9063386M-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 3386M-1-503 is determined by the following critical parameters: resistance value (50 kOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1), resistive material (Cermet), mounting type (Through Hole), and termination style (PC Pins). Parts meeting all these electrical and mechanical criteria are classified as direct substitutes. Secondary considerations include physical dimensions, adjustment type (top vs. side), and packaging format, which may affect board layout and assembly procedures but do not alter electrical performance.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the core electrical specifications of the 3386M-1-503. Selection among substitutes should be based on the following factors:

RoHS Compliance: The 3386M-1-503 is RoHS non-compliant. If RoHS compliance is required for the application, the 25PR50KLF, 72PR50KLF, 82PR50KLF, and M63P503KB40 are all ROHS3 compliant alternatives.

Physical Dimensions: The 72PR50KLF maintains identical footprint dimensions (0.375" x 0.375") to the 3386M-1-503, making it the most direct mechanical substitute. The 25PR50KLF is smaller (0.270" x 0.270"), and the 82PR50KLF is round (0.250" diameter), both requiring board layout verification. The M63P503KB40 is slightly larger (0.395" x 0.395").

Adjustment Type: The 3386M-1-503 and all TT Electronics/BI substitutes feature top adjustment. The M63P503KB40 features side adjustment, which may affect accessibility and assembly procedures depending on board design.

Packaging: The 3386M-1-503 is supplied in Tube packaging. The 25PR50KLF is also Tube packaged. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in Bulk packaging, which may impact procurement and handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the 25PR50KLF replace the 3386M-1-503 in all applications? A: The 25PR50KLF matches all electrical specifications and adjustment type. However, its smaller physical dimensions (0.270" x 0.270" vs. 0.375" x 0.375") require verification that the board layout accommodates the reduced footprint. Both are top-adjustment, PC pin through-hole components with identical electrical performance.

Q: What is the primary difference between the 72PR50KLF and 82PR50KLF? A: Both parts are electrically identical and feature top adjustment. The primary difference is physical form factor: the 72PR50KLF is square (0.375" x 0.375"), while the 82PR50KLF is round (0.250" diameter). Selection depends on available board space and mounting hole configuration.

Q: Why is the M63P503KB40 listed as a substitute if it has side adjustment instead of top adjustment? A: The M63P503KB40 meets all electrical specifications (50 kOhms, 0.5W, ±10% tolerance, ±100ppm/°C temperature coefficient, 1 turn, Cermet, through-hole PC pins). Side adjustment affects operator accessibility and assembly procedures but does not alter electrical performance. Board design must accommodate side-mounted adjustment access.

Q: Are there compliance differences between the substitute parts? A: Yes. The 3386M-1-503 is RoHS non-compliant and REACH Affected. The 25PR50KLF is RoHS Compliant and REACH Unaffected. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are all ROHS3 Compliant and REACH Unaffected. Regulatory requirements for the end application determine which substitute is appropriate.

Q: Can I use the 82PR50KLF if my PCB is designed for square potentiometers? A: No. The 82PR50KLF has a round form factor (0.250" diameter) and requires a circular mounting hole. The 3386M-1-503, 72PR50KLF, and 25PR50KLF are square and compatible with square mounting patterns. The M63P503KB40 is also square but larger.

Q: What packaging considerations should I account for when switching from 3386M-1-503 to a substitute? A: The 3386M-1-503 and 25PR50KLF are supplied in Tube packaging. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in Bulk packaging. Bulk packaging may require different handling, storage, and counting procedures during assembly and inventory management.