3386T-1-104 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3386T-1-104 is a 100 kOhm, 0.5W through-hole trimmer potentiometer with top adjustment and PC pin termination. This sealed Trimpot® 3386 series component is actively manufactured and widely used in precision circuit tuning applications. 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	100 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
Face Dimension	Square - 0.375" x 0.375" (9.53mm x 9.53mm)

Substitute Part Grouping Explanation

Substitute parts for the 3386T-1-104 are qualified based on the following critical parameters:

Resistance value: 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

Substitutes are grouped into two categories: direct equivalents with matching adjustment type and face dimensions, and functional equivalents with alternative adjustment types or slightly different mechanical envelopes that remain compatible with standard PCB layouts for this component class.

Parameter Comparison

Parameter	3386T-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
Adjustment Type	Top Adjustment	Top Adjustment	Top Adjustment	Side Adjustment
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
Face 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)
Packaging	Tube	Tube	Bulk	Bulk
RoHS Status	Non-compliant	Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

25PR100KLF (TT Electronics / BI Technologies): This substitute provides identical electrical specifications and top adjustment functionality. The primary difference is a smaller face dimension (0.270" vs. 0.375"), which may require PCB layout verification for clearance compatibility. This part is RoHS Compliant and REACH Unaffected, offering improved regulatory compliance compared to the main part.

72PMR100KLF (TT Electronics/BI): This substitute matches the main part in all critical electrical parameters and face dimensions (0.375" x 0.375"). Top adjustment type is identical. The part is supplied in bulk packaging rather than tube format. RoHS3 Compliant and REACH Unaffected status provides enhanced regulatory alignment.

M63P104KB40 (Vishay Spectrol): This substitute meets all electrical specifications but features side adjustment instead of top adjustment. Face dimension is slightly larger (0.395" x 0.395"). Side adjustment orientation requires PCB layout consideration for accessibility. RoHS3 Compliant and REACH Unaffected. Moisture Sensitivity Level is rated at 1 (Unlimited).

Selection should prioritize dimensional compatibility with existing PCB layouts and adjustment accessibility requirements for the application.

Frequently Asked Questions (FAQ)

Q: Can the 25PR100KLF be used as a direct replacement for the 3386T-1-104?

A: The 25PR100KLF matches all electrical specifications and adjustment type. However, the smaller face dimension (0.270" vs. 0.375") requires verification that the PCB footprint and surrounding component clearances accommodate the reduced size.

Q: What is the primary difference between the 72PMR100KLF and the main part?

A: The 72PMR100KLF is electrically and mechanically equivalent to the 3386T-1-104, with matching face dimensions and top adjustment. The main difference is packaging format: bulk versus tube.

Q: Why does the M63P104KB40 have side adjustment instead of top adjustment?

A: The M63P104KB40 is a Vishay Spectrol design variant within the same functional class. Side adjustment requires different PCB layout planning for potentiometer access during calibration or field adjustment.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The main part (3386T-1-104) is RoHS non-compliant. All three substitutes are RoHS Compliant or ROHS3 Compliant, making them suitable for applications with RoHS requirements.

Q: Does face dimension affect electrical performance?

A: Face dimension does not affect electrical performance. However, it impacts PCB layout compatibility, mounting hole spacing, and clearance to adjacent components. Verify footprint compatibility before substitution.

Q: What does REACH Affected versus REACH Unaffected mean for part selection?

A: REACH Affected status indicates the part may contain substances of concern under REACH regulations. REACH Unaffected parts are not subject to these restrictions. Selection depends on application regulatory requirements.

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