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

Part Overview

The 3386P-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer manufactured by Bourns Inc. as part of the Trimpot® 3386 Sealed series. This component features cermet resistive material, top adjustment, and PC pin termination in a square 0.375" x 0.375" form factor. The part is currently active in production. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional performance within the allowed parameter tolerances for this product category.

Key Parameters

Parameter	Specification
Resistance Value	50 kOhms
Power Rating	0.5W (1/2W)
Tolerance	±10%
Temperature Coefficient	±100ppm/°C
Number of Turns	1
Adjustment Type	Top Adjustment
Resistive Material	Cermet
Mounting Type	Through Hole
Termination Style	PC Pins
Size / Dimension	Square - 0.375" x 0.375" Face (9.53mm x 9.53mm)

Substitute Part Grouping Explanation

Substitution eligibility for the 3386P-1-503 is determined by strict matching of 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). Adjustment type and physical dimensions are secondary considerations; parts with identical electrical characteristics but different adjustment mechanisms (top vs. side) or minor dimensional variations may serve as functional equivalents in applications where mechanical constraints permit. Packaging format (tube vs. bulk) does not affect electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Resistance	Power (W)	Tolerance	Temp Coeff	Turns	Adjustment	Material	Mount Type	Termination	Size	RoHS Status
3386P-1-503	Bourns Inc.	50 kOhms	0.5	±10%	±100ppm/°C	1	Top	Cermet	Through Hole	PC Pins	0.375" x 0.375"	Non-compliant
3386P-1-503LF	Bourns Inc.	50 kOhms	0.5	±10%	±100ppm/°C	1	Top	Cermet	Through Hole	PC Pins	0.375" x 0.375"	ROHS3 Compliant
25PR50KLF	TT Electronics/BI	50 kOhms	0.5	±10%	±100ppm/°C	1	Top	Cermet	Through Hole	PC Pins	0.270" x 0.270"	RoHS Compliant
72PR50KLF	TT Electronics/BI	50 kOhms	0.5	±10%	±100ppm/°C	1	Top	Cermet	Through Hole	PC Pins	0.375" x 0.375"	ROHS3 Compliant
82PR50KLF	TT Electronics/BI	50 kOhms	0.5	±10%	±100ppm/°C	1	Top	Cermet	Through Hole	PC Pins	0.250" Dia (Round)	ROHS3 Compliant
M63P503KB40	Vishay Spectrol	50 kOhms	0.5	±10%	±100ppm/°C	1	Side	Cermet	Through Hole	PC Pins	0.395" x 0.395"	ROHS3 Compliant

Engineering Selection Recommendations

The 3386P-1-503LF is the direct equivalent from Bourns Inc., offering identical electrical and mechanical specifications with the addition of ROHS3 compliance, making it suitable for applications requiring regulatory adherence.

The 72PR50KLF from TT Electronics/BI matches the original part's physical dimensions (0.375" x 0.375" square) and all electrical parameters while providing ROHS3 compliance and bulk packaging availability.

The 25PR50KLF from TT Electronics/BI provides electrical equivalence with a smaller footprint (0.270" x 0.270" square), suitable for space-constrained applications where the reduced size does not conflict with circuit board layout requirements.

The 82PR50KLF from TT Electronics/BI maintains full electrical equivalence but features a round form factor (0.250" diameter) instead of square, requiring mechanical accommodation in the mounting design.

The M63P503KB40 from Vishay Spectrol provides electrical equivalence with side adjustment instead of top adjustment. This part is suitable only for applications where the adjustment mechanism orientation does not impact operational requirements or accessibility constraints. The slightly larger square footprint (0.395" x 0.395") must be verified against available board space.

Frequently Asked Questions (FAQ)

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

A: Yes. The 3386P-1-503LF is electrically and mechanically identical to the 3386P-1-503, with the addition of ROHS3 compliance. Both parts share the same resistance value, power rating, tolerance, temperature coefficient, adjustment type, and physical dimensions.

Q: What is the primary difference between the 3386P-1-503 and 72PR50KLF?

A: Both parts are electrically identical with matching 50 kOhm resistance, 0.5W power rating, and 0.375" x 0.375" square dimensions. The primary difference is manufacturer (Bourns vs. TT Electronics/BI) and RoHS compliance status (72PR50KLF is ROHS3 compliant). Packaging differs (tube vs. bulk).

Q: Can the 25PR50KLF be used in place of the 3386P-1-503?

A: The 25PR50KLF is electrically equivalent but features a smaller square footprint (0.270" x 0.270" vs. 0.375" x 0.375"). Substitution is possible only if the reduced physical size is compatible with the circuit board layout and mounting requirements.

Q: What is the significance of the adjustment type difference in M63P503KB40?

A: The M63P503KB40 features side adjustment instead of top adjustment. This affects the physical orientation and accessibility of the adjustment mechanism. Substitution is valid only if the application does not require top-mounted adjustment access or if the side adjustment orientation is mechanically compatible with the design.

Q: Are there packaging differences between substitute parts?

A: Yes. The 3386P-1-503, 3386P-1-503LF, and 25PR50KLF are supplied in tube packaging. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in bulk packaging. Packaging format does not affect electrical or mechanical performance.

Q: Which substitute part offers the best RoHS compliance?

A: All substitute parts except the original 3386P-1-503 are RoHS compliant. The 3386P-1-503LF, 72PR50KLF, 82PR50KLF, and M63P503KB40 are ROHS3 compliant. The 25PR50KLF is RoHS compliant.

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