Bourns 3386M-1-102 Equivalent & Substitute Parts

Part Overview

The Bourns 3386M-1-102 is a 1 kOhm, 0.5W through-hole trimmer potentiometer with PC pin termination and top adjustment. This sealed Trimpot® 3386 series component features cermet resistive material, ±10% tolerance, and ±100ppm/°C temperature coefficient. The part is currently active in production with 1108 units in stock. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional performance within the allowed parameter ranges for this trimmer potentiometer category.

Key Parameters

Parameter	Value
Resistance	1 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
Adjustment Type	Top Adjustment

Substitute Part Grouping Explanation

Substitute parts for the 3386M-1-102 are qualified based on the following electrical and mechanical parameters:

Core Electrical Match: All substitute parts maintain 1 kOhm resistance, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, and 1-turn operation with cermet resistive material.

Mechanical Compatibility: Substitutes must feature through-hole mounting with PC pin termination. Adjustment type (top or side) and physical dimensions are secondary considerations that may vary depending on application space constraints.

Functional Equivalence: All listed substitutes are active production parts with cermet construction, matching the electrical performance envelope of the main part.

The following substitute parts meet these criteria:

25PR1KLF (TT Electronics/BI): Smaller footprint variant, top adjustment
72PR1KLF (TT Electronics/BI): Matching footprint, top adjustment
72PMR1KLF (TT Electronics/BI): Matching footprint, top adjustment
82PR1KLF (TT Electronics/BI): Round package variant, top adjustment
M63P102KB40 (Vishay Spectrol): Side adjustment variant

Parameter Comparison

Part Number	Manufacturer	Resistance	Power (W)	Tolerance	Temp Coeff	Turns	Material	Adjustment	Size / Dimension	RoHS Status	Inventory
3386M-1-102	Bourns Inc.	1 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	Non-compliant	1108
25PR1KLF	TT Electronics/BI	1 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.270" x 0.270" (6.86mm x 6.86mm)	Compliant	12299
72PR1KLF	TT Electronics/BI	1 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3 Compliant	1900
72PMR1KLF	TT Electronics/BI	1 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3 Compliant	2034
82PR1KLF	TT Electronics/BI	1 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Round 0.250" Dia (6.35mm)	ROHS3 Compliant	2806
M63P102KB40	Vishay Spectrol	1 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Side	Square 0.395" x 0.395" (10.03mm x 10.03mm)	ROHS3 Compliant	1070

Engineering Selection Recommendations

Direct Footprint Match (Preferred for PCB Layout Compatibility):

72PR1KLF and 72PMR1KLF maintain the identical 0.375" x 0.375" square footprint as the 3386M-1-102 with top adjustment. Both are ROHS3 compliant and available in active production.

Space-Constrained Applications:

25PR1KLF provides a smaller 0.270" x 0.270" footprint with identical electrical specifications and top adjustment. RoHS compliant with highest inventory availability (12299 units).
82PR1KLF offers a compact round 0.250" diameter package for applications requiring minimal board space. ROHS3 compliant.

Alternative Adjustment Orientation:

M63P102KB40 (Vishay Spectrol) features side adjustment instead of top adjustment. Select only if application design accommodates side-mounted adjustment access. ROHS3 compliant.

Compliance Consideration: All substitute parts except the main 3386M-1-102 are RoHS compliant, supporting modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 3386M-1-102 with any of these parts without circuit redesign? A: Yes, for applications where PCB layout permits. The 72PR1KLF and 72PMR1KLF maintain identical footprints and top adjustment. The 25PR1KLF and 82PR1KLF require smaller mounting pads. The M63P102KB40 requires side adjustment access instead of top access.

Q: What is the primary difference between 72PR1KLF and 72PMR1KLF? A: Both parts share identical electrical specifications and footprint (0.375" x 0.375" square). The primary difference is packaging: 72PR1KLF is supplied in bulk, while 72PMR1KLF is also supplied in bulk. Both are ROHS3 compliant and active production parts.

Q: Is the 25PR1KLF suitable for high-density PCB designs? A: Yes. The 25PR1KLF provides a smaller 0.270" x 0.270" footprint while maintaining all electrical specifications of the 3386M-1-102. It is RoHS compliant and has the highest inventory availability.

Q: Why would I choose the M63P102KB40 over other substitutes? A: The M63P102KB40 is selected only when application design requires side adjustment access rather than top adjustment. It is ROHS3 compliant and maintains all electrical specifications.

Q: Are all substitute parts currently in active production? A: Yes. All listed substitute parts are active production components with confirmed inventory availability.

Q: What is the impact of adjustment type (top vs. side) on circuit performance? A: Adjustment type affects only the mechanical access point for tuning. Electrical performance and specifications remain identical. Selection depends on PCB layout and operator access requirements.

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