Bourns 3386F-1-102 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3386F-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 is actively produced and widely used in circuit calibration and tuning applications. Substitute parts become necessary due to inventory constraints, regional availability, packaging preferences, or compliance requirements such as RoHS status.

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

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following core parameters: resistance value (1 kOhm), 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).

Substitute parts are grouped into two categories:

Direct Substitutes (Same Adjustment Type): Parts with top adjustment matching the original 3386F-1-102 specification.

Compatible Substitutes (Different Adjustment Type or Form Factor): Parts meeting all electrical parameters but differing in adjustment mechanism (side vs. top) or physical dimensions. These require mechanical verification during board layout.

Parameter Comparison

Part Number	Manufacturer	Resistance	Power	Tolerance	Temp Coeff	Turns	Adjustment	Size / Dimension	RoHS Status	Packaging	Inventory
3386F-1-102	Bourns Inc.	1 kOhms	0.5W	±10%	±100ppm/°C	1	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	RoHS non-compliant	Tube	1190 Pcs
3386F-1-102LF	Bourns Inc.	1 kOhms	0.5W	±10%	±100ppm/°C	1	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3 Compliant	Tube	5400 Pcs
25PR1KLF	TT Electronics/BI	1 kOhms	0.5W	±10%	±100ppm/°C	1	Top	Square 0.270" x 0.270" (6.86mm x 6.86mm)	RoHS Compliant	Tube	12299 Pcs
72PMR1KLF	TT Electronics/BI	1 kOhms	0.5W	±10%	±100ppm/°C	1	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3 Compliant	Bulk	2034 Pcs
72PR1KLF	TT Electronics/BI	1 kOhms	0.5W	±10%	±100ppm/°C	1	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3 Compliant	Bulk	1900 Pcs
82PR1KLF	TT Electronics/BI	1 kOhms	0.5W	±10%	±100ppm/°C	1	Top	Round 0.250" Dia (6.35mm)	ROHS3 Compliant	Bulk	2806 Pcs
M63P102KB40	Vishay Spectrol	1 kOhms	0.5W	±10%	±100ppm/°C	1	Side	Square 0.395" x 0.395" (10.03mm x 10.03mm)	ROHS3 Compliant	Bulk	1070 Pcs

Engineering Selection Recommendations

Primary Direct Substitute: 3386F-1-102LF (Bourns Inc.) is the preferred substitute. It maintains identical electrical specifications, form factor, and adjustment type while offering ROHS3 compliance and higher inventory availability (5400 units).

Secondary Direct Substitutes: 72PMR1KLF and 72PR1KLF (TT Electronics/BI) provide equivalent electrical and mechanical performance with identical dimensions and ROHS3 compliance. Both are available in bulk packaging.

Form Factor Alternatives: 25PR1KLF offers a smaller footprint (0.270" x 0.270") suitable for space-constrained layouts. 82PR1KLF provides a round form factor (0.250" diameter) for applications requiring different mounting geometry.

Adjustment Type Variant: M63P102KB40 (Vishay Spectrol) matches all electrical parameters but features side adjustment instead of top adjustment. This part is suitable only for designs where side-access adjustment is acceptable and board layout permits the larger 0.395" x 0.395" footprint.

Compliance Consideration: The original 3386F-1-102 is RoHS non-compliant. All listed substitutes except 25PR1KLF (RoHS Compliant) are ROHS3 compliant, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can 3386F-1-102LF directly replace 3386F-1-102 without PCB modification?

A: Yes. The 3386F-1-102LF is a direct replacement with identical electrical specifications, tolerance, temperature coefficient, and physical dimensions. The only difference is RoHS compliance status. No PCB layout changes are required.

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

A: Top adjustment (3386F-1-102, 3386F-1-102LF, 25PR1KLF, 72PMR1KLF, 72PR1KLF, 82PR1KLF) allows potentiometer tuning from the component's upper surface. Side adjustment (M63P102KB40) requires access from the component's side. Selection depends on board layout and accessibility requirements during calibration.

Q: Are there dimensional constraints when substituting between different manufacturers?

A: Yes. While all parts share the same electrical specifications, physical dimensions vary. The 25PR1KLF is smaller (0.270" x 0.270"), the 82PR1KLF is round (0.250" diameter), and the M63P102KB40 is larger (0.395" x 0.395"). Verify PCB footprint compatibility before substitution.

Q: Does packaging type (Tube vs. Bulk) affect electrical performance?

A: No. Packaging type affects only handling, storage, and ordering quantities. Electrical and mechanical performance is identical between tube and bulk packaged units of the same part number.

Q: Which substitute offers the best inventory availability?

A: The 25PR1KLF (TT Electronics/BI) has the highest inventory at 12,299 units. The 3386F-1-102LF (Bourns Inc.) offers 5,400 units with identical form factor to the original part.

Q: Is the M63P102KB40 suitable for new designs?

A: The M63P102KB40 meets all electrical specifications and is ROHS3 compliant. However, its side adjustment mechanism and larger footprint (0.395" x 0.395") require board layout verification. Use only if design constraints prevent use of top-adjustment alternatives.

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