Bourns 3386F-1-203 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3386F-1-203 is a 20 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 precision circuit tuning applications. Substitute parts may be required due to inventory availability, compliance requirements, or specific application constraints such as RoHS certification status or physical footprint compatibility.

Substiute Parts

3386F-1-203

Bourns Inc.In Stock: 8003386F-1-203 Datasheet

Current PartRFQ

3386F-1-203LF

Bourns Inc.In Stock: 10533386F-1-203LF Datasheet

DirectRFQ

25PR20KLF

TT Electronics/BIIn Stock: 266225PR20KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: resistance value (20 kOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1), adjustment type (top adjustment), resistive material (cermet), mounting type (through hole), and termination style (PC pins).

Two substitute parts meet these criteria:

Direct Substitute (3386F-1-203LF): Identical electrical and mechanical specifications to the main part. Differs only in RoHS compliance status (ROHS3 Compliant vs. RoHS non-compliant) and REACH classification.

Similar Substitute (25PR20KLF): Matches all electrical parameters and core mechanical specifications. Physical footprint differs: 0.270" x 0.270" (6.86mm x 6.86mm) versus 0.375" x 0.375" (9.53mm x 9.53mm). Manufactured by TT Electronics/BI rather than Bourns Inc.

Parameter Comparison

Engineering Selection Recommendations

3386F-1-203LF (Direct Substitute): Select this part when RoHS3 compliance and REACH unaffected status are required. Identical footprint and electrical performance ensure direct board-level compatibility without layout modifications. Higher inventory availability (953 pcs) supports production scheduling.

25PR20KLF (Similar Substitute): Select this part when space constraints favor a smaller footprint (0.270" x 0.270" versus 0.375" x 0.375"). RoHS and REACH compliance are satisfied. Highest inventory availability (2646 pcs) supports rapid procurement. Verify PCB layout accommodates the reduced physical dimensions and confirm mechanical clearance for adjustment access.

3386F-1-203 (Original): Retain for applications where RoHS non-compliance is acceptable and REACH-affected status does not conflict with supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can 3386F-1-203LF replace 3386F-1-203 directly on the PCB? A: Yes. Both parts share identical electrical specifications, tolerance, temperature coefficient, and physical footprint (0.375" x 0.375"). No layout modifications are required.

Q: What is the primary difference between 3386F-1-203 and 3386F-1-203LF? A: RoHS compliance status and REACH classification. The 3386F-1-203LF is ROHS3 Compliant and REACH Unaffected, while the original is RoHS non-compliant and REACH Affected. Electrical and mechanical performance are identical.

Q: Can 25PR20KLF be used as a direct replacement? A: Electrically, yes. Mechanically, the 25PR20KLF has a smaller footprint (0.270" x 0.270" versus 0.375" x 0.375"). PCB layout must accommodate the reduced size, and adjustment access must be verified. All electrical parameters match.

Q: Are all three parts rated for the same power dissipation? A: Yes. All three parts are rated at 0.5W (1/2W) with ±10% tolerance and ±100ppm/°C temperature coefficient.

Q: Which substitute has the best inventory availability? A: The 25PR20KLF (TT Electronics/BI) has the highest inventory at 2646 pcs, followed by 3386F-1-203LF at 953 pcs.

Q: Do all parts use the same resistive material? A: Yes. All three parts use cermet as the resistive material, ensuring consistent performance characteristics.

Q: What compliance certifications apply to each part? A: 3386F-1-203: RoHS non-compliant, REACH Affected. 3386F-1-203LF: ROHS3 Compliant, REACH Unaffected. 25PR20KLF: RoHS Compliant, REACH Unaffected.