3386K-1-503 Equivalent & Substitute Parts

Part Overview

The Bourns 3386K-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer with PC pin termination and top adjustment. This Trimpot® 3386 series 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.

Key Parameters

Parameter	Value
Resistance	50 kOhms
Power Rating	0.5W (1/2W)
Tolerance	±10%
Temperature Coefficient	±100ppm/°C
Number of Turns	1
Resistive Material	Cermet
Mounting Type	Through Hole
Termination Style	PC Pins

Substitute Part Grouping Explanation

Substitution eligibility for the 3386K-1-503 is determined by the following critical parameters:

Resistance value: 50 kOhms (exact match required)
Power rating: 0.5W / 1/2W (exact match required)
Tolerance: ±10% (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
Number of turns: 1 (exact match required)
Resistive material: Cermet (exact match required)
Mounting type: Through Hole (exact match required)
Termination style: PC Pins (exact match required)

Substitute parts may differ in adjustment type (top vs. side), physical dimensions, packaging format, and RoHS/REACH compliance status without affecting functional equivalence in circuit applications where these variations are acceptable.

Parameter Comparison

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

Engineering Selection Recommendations

All listed substitute parts match the core electrical and mechanical specifications of the 3386K-1-503. Selection among equivalents should be based on the following factors:

RoHS Compliance Requirements: The 3386K-1-503 is RoHS non-compliant. Applications requiring RoHS3 compliance should specify 72PR50KLF, 82PR50KLF, or M63P503KB40. The 25PR50KLF offers RoHS compliance without ROHS3 designation.

Adjustment Type Compatibility: The 3386K-1-503, 25PR50KLF, 72PR50KLF, and 82PR50KLF feature top adjustment. The M63P503KB40 features side adjustment. Circuit board layout and accessibility requirements determine which adjustment type is suitable.

Physical Dimensions: The 3386K-1-503 and 72PR50KLF share identical square face dimensions (0.375" x 0.375"). The 25PR50KLF has a smaller square face (0.270" x 0.270"). The 82PR50KLF has a round form factor (0.250" diameter). The M63P503KB40 has a square face (0.395" x 0.395"). PCB footprint compatibility must be verified before substitution.

Packaging Format: The 3386K-1-503 is supplied in Tube packaging. Substitute parts 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in Bulk packaging. The 25PR50KLF is supplied in Tube packaging, matching the original packaging format.

REACH Status: The 3386K-1-503 is REACH Affected. All substitute parts are REACH Unaffected, providing regulatory advantage in applications subject to REACH restrictions.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 3386K-1-503 with any of these parts in my circuit?

A: Substitution is valid only if your circuit application accepts the differences in adjustment type and physical dimensions. All parts share identical electrical specifications (50 kOhms, 0.5W, ±10% tolerance, ±100ppm/°C temperature coefficient, 1 turn, Cermet material, through-hole mounting, PC pin termination). Verify PCB footprint compatibility and adjustment accessibility before substitution.

Q: What is the difference between top adjustment and side adjustment?

A: Top adjustment (3386K-1-503, 25PR50KLF, 72PR50KLF, 82PR50KLF) allows the potentiometer to be adjusted from above the PCB. Side adjustment (M63P503KB40) requires access from the side. Selection depends on PCB layout and accessibility requirements during calibration and maintenance.

Q: Are all substitute parts pin-compatible with the 3386K-1-503?

A: All substitute parts use PC pin termination and through-hole mounting, matching the 3386K-1-503. However, physical dimensions vary. The 25PR50KLF and 82PR50KLF have different footprints than the 3386K-1-503. The 72PR50KLF shares the same square face dimensions. The M63P503KB40 has a larger square face. PCB hole spacing and layout must be verified for each substitute.

Q: Which substitute offers the best compliance profile?

A: The 72PR50KLF and 82PR50KLF offer ROHS3 compliance and REACH Unaffected status. The M63P503KB40 also meets ROHS3 and REACH Unaffected requirements. The 25PR50KLF provides RoHS compliance and REACH Unaffected status. Selection depends on specific regulatory requirements for your application.

Q: Can I use the M63P503KB40 as a direct replacement?

A: The M63P503KB40 is electrically equivalent but features side adjustment instead of top adjustment and has a larger physical footprint (0.395" x 0.395" vs. 0.375" x 0.375"). Use only if your PCB layout accommodates the larger dimensions and side adjustment access is available.

Q: What packaging considerations should I account for?

A: The 3386K-1-503 and 25PR50KLF are supplied in Tube packaging. The 72PR50KLF, 82PR50KLF, and M63P503KB40 are supplied in Bulk packaging. Bulk packaging may require additional handling and storage considerations compared to tube packaging.

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