Bourns 3386K-1-104 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3386K-1-104 is a 100 kOhm, 0.5W through-hole trimmer potentiometer with top adjustment, PC pin termination, and cermet resistive material. This component is classified as Active product status. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific compliance and packaging needs.

Key Parameters

Parameter	Value
Resistance	100 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-1-104 is determined by strict alignment with the following core parameters: 100 kOhm resistance value, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 1-turn configuration, cermet resistive material, through-hole mounting, and PC pin termination. Adjustment type (top or side) and physical dimensions represent secondary considerations that may affect mechanical fit but do not preclude functional substitution in applications where layout permits.

The following parts meet these substitution criteria:

25PR100KLF (TT Electronics / BI Technologies): Matches all core electrical parameters. Smaller physical footprint (0.270" x 0.270" vs. 0.375" x 0.375"). RoHS Compliant.

72PMR100KLF (TT Electronics/BI): Matches all core electrical parameters. Identical physical footprint (0.375" x 0.375"). Bulk packaging. ROHS3 Compliant.

M63P104KB40 (Vishay Spectrol): Matches all core electrical parameters except adjustment type (side adjustment vs. top adjustment). Slightly larger physical footprint (0.395" x 0.395"). ROHS3 Compliant.

Parameter Comparison

Parameter	3386K-1-104 (Bourns)	25PR100KLF (TT Electronics)	72PMR100KLF (TT Electronics)	M63P104KB40 (Vishay Spectrol)
Resistance	100 kOhms	100 kOhms	100 kOhms	100 kOhms
Power Rating	0.5W	0.5W	0.5W	0.5W
Tolerance	±10%	±10%	±10%	±10%
Temperature Coefficient	±100ppm/°C	±100ppm/°C	±100ppm/°C	±100ppm/°C
Number of Turns	1	1	1	1
Resistive Material	Cermet	Cermet	Cermet	Cermet
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Termination Style	PC Pins	PC Pins	PC Pins	PC Pins
Adjustment Type	Top Adjustment	Top Adjustment	Top Adjustment	Side Adjustment
Size / Dimension	0.375" x 0.375" (9.53mm x 9.53mm)	0.270" x 0.270" (6.86mm x 6.86mm)	0.375" x 0.375" (9.53mm x 9.53mm)	0.395" x 0.395" (10.03mm x 10.03mm)
RoHS Status	RoHS non-compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Tube	Tube	Bulk	Bulk
Inventory Status	892 Pcs	2755 Pcs	764 Pcs	915 Pcs

Engineering Selection Recommendations

25PR100KLF is suitable for applications where board space is constrained and RoHS compliance is required. The reduced footprint (0.270" x 0.270") necessitates verification of mechanical clearance in existing PCB layouts designed for the 3386K-1-104 (0.375" x 0.375"). Tube packaging supports standard component handling workflows.

72PMR100KLF provides direct mechanical and electrical compatibility with identical footprint dimensions (0.375" x 0.375") and top adjustment configuration. ROHS3 compliance and higher inventory availability (764 pcs) support supply chain flexibility. Bulk packaging may require alternative handling procedures compared to tube packaging.

M63P104KB40 maintains full electrical parameter alignment but features side adjustment instead of top adjustment. The slightly larger footprint (0.395" x 0.395") and side adjustment configuration require PCB layout verification. ROHS3 compliance and MSL rating (1 - Unlimited) support extended storage and handling flexibility. Selection is appropriate only when mechanical layout accommodates side-mounted adjustment access.

Frequently Asked Questions (FAQ)

Q: Can the 25PR100KLF replace the 3386K-1-104 in existing designs?

A: Electrical substitution is valid. The 25PR100KLF matches all core electrical parameters (100 kOhm, 0.5W, ±10% tolerance, ±100ppm/°C, 1-turn, cermet, through-hole, PC pins). However, the reduced physical footprint (0.270" x 0.270" vs. 0.375" x 0.375") requires PCB layout verification to confirm mechanical clearance and mounting hole compatibility.

Q: What is the primary difference between the 72PMR100KLF and the 3386K-1-104?

A: Both parts are electrically and mechanically equivalent with identical footprints and top adjustment configuration. The primary differences are manufacturer (TT Electronics vs. Bourns), packaging format (bulk vs. tube), and RoHS compliance status (ROHS3 vs. non-compliant).

Q: Is the M63P104KB40 a direct replacement?

A: The M63P104KB40 is electrically equivalent but features side adjustment instead of top adjustment. This configuration difference affects PCB layout and operator access to the adjustment mechanism. Mechanical compatibility requires verification of available space for side-mounted adjustment access.

Q: What compliance considerations apply to substitute selection?

A: The 3386K-1-104 is RoHS non-compliant. Both 25PR100KLF (RoHS Compliant) and 72PMR100KLF and M63P104KB40 (ROHS3 Compliant) meet current RoHS requirements. Selection should align with end-product compliance obligations and supply chain requirements.

Q: How do packaging differences affect component selection?

A: The 3386K-1-104 and 25PR100KLF are supplied in tube packaging, supporting standard pick-and-place and manual assembly workflows. The 72PMR100KLF and M63P104KB40 are supplied in bulk packaging, which may require alternative handling, counting, and storage procedures. Packaging selection should align with manufacturing process requirements.

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