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

Part Overview

The Bourns 3386U-1-102 is a 1 kOhm, 0.5W through-hole trimmer potentiometer with top adjustment, cermet resistive element, and PC pin termination. This component is classified as Active product status. Substitute parts become necessary when the primary part experiences supply constraints, when alternative RoHS compliance levels are required, or when form factor variations suit specific PCB layout requirements.

Substiute Parts

3386U-1-102

Bourns Inc.In Stock: 7893386U-1-102 Datasheet

Current PartRFQ

25PR1KLF

TT Electronics/BIIn Stock: 1231025PR1KLF Datasheet

SimilarRFQ

72PMR1KLF

TT Electronics/BIIn Stock: 204472PMR1KLF Datasheet

SimilarRFQ

72PR1KLF

TT Electronics/BIIn Stock: 200572PR1KLF Datasheet

SimilarRFQ

82PR1KLF

TT Electronics/BIIn Stock: 290082PR1KLF Datasheet

SimilarRFQ

M63P102KB40

Vishay SpectrolIn Stock: 1152M63P102KB40 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: resistance value (1 kOhms), 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).

The substitute parts are grouped into two categories:

Category A: Top Adjustment Equivalents — Parts maintaining identical adjustment type (top adjustment) with potential form factor variations:

• 25PR1KLF (TT Electronics/BI Series 25): Square 0.270" x 0.270" face
• 72PMR1KLF (TT Electronics/BI Series 72): Square 0.375" x 0.375" face
• 72PR1KLF (TT Electronics/BI Series 72): Square 0.375" x 0.375" face

Category B: Adjustment Type Variation — Part with side adjustment instead of top adjustment:

• M63P102KB40 (Vishay Spectrol Series 63): Square 0.395" x 0.395" face, side adjustment

Parameter Comparison

Engineering Selection Recommendations

For direct form factor replacement with improved compliance: 72PMR1KLF and 72PR1KLF maintain the identical 0.375" x 0.375" square footprint as the 3386U-1-102 while providing ROHS3 compliance. Both parts are manufactured by TT Electronics/BI and preserve top adjustment functionality.

For compact PCB layouts: 25PR1KLF offers the smallest footprint at 0.270" x 0.270" with RoHS compliance, suitable for space-constrained applications where the reduced size does not conflict with mechanical adjustment accessibility.

For alternative form factor: 82PR1KLF provides a round 0.250" diameter package with ROHS3 compliance, applicable when circular mounting patterns are preferred.

For side adjustment requirement: M63P102KB40 is the only substitute with side adjustment instead of top adjustment. This part is ROHS3 compliant and suitable for applications where top-mounted adjustment is not feasible due to PCB layout constraints. The larger 0.395" x 0.395" footprint must be verified against available board space.

All substitute parts maintain electrical equivalence across resistance, power rating, tolerance, temperature coefficient, and resistive material specifications.

Frequently Asked Questions (FAQ)

Q: Can 25PR1KLF replace 3386U-1-102 in a design with space constraints? A: Yes, 25PR1KLF is electrically equivalent and maintains top adjustment. The reduced footprint (0.270" x 0.270" versus 0.375" x 0.375") requires verification that adjustment tool access is not compromised and that PCB layout accommodates the smaller component.

Q: What is the primary difference between 72PMR1KLF and 72PR1KLF? A: Both parts are electrically and mechanically identical with matching 0.375" x 0.375" footprints and ROHS3 compliance. The difference is packaging: 72PMR1KLF is supplied in Bulk, while 72PR1KLF is also supplied in Bulk. Verify packaging requirements for your procurement process.

Q: Is M63P102KB40 a direct replacement for 3386U-1-102? A: M63P102KB40 is electrically equivalent but differs in adjustment type (side adjustment versus top adjustment) and footprint (0.395" x 0.395" versus 0.375" x 0.375"). Use only when side adjustment is compatible with your application and PCB layout permits the larger size.

Q: Why is 3386U-1-102 marked RoHS non-compliant while substitutes are compliant? A: The 3386U-1-102 is from the original Trimpot 3386 series which predates RoHS3 requirements. All listed substitutes meet current ROHS3 compliance standards, making them suitable for applications requiring regulatory compliance.

Q: Are all substitutes available in the same packaging as the original part? A: No. The 3386U-1-102 is supplied in Tube packaging. Substitutes 25PR1KLF, 72PMR1KLF, 72PR1KLF, 82PR1KLF, and M63P102KB40 are supplied in Bulk packaging. Confirm packaging compatibility with your assembly and procurement workflow.

Q: Can I use 82PR1KLF if my PCB has square mounting holes? A: No. The 82PR1KLF has a round 0.250" diameter form factor, which is incompatible with square mounting patterns. Use 72PMR1KLF or 72PR1KLF for square footprint equivalence.