Bourns 3319P-1-203 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3319P-1-203 is a 20 kOhm through-hole trimmer potentiometer with 0.2W power rating, carbon resistive material, and top adjustment capability. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The Trimpot® 3319 series open frame design provides PC pin termination suitable for printed circuit board assembly.

Substiute Parts

3319P-1-203

Bourns Inc.In Stock: 10913319P-1-203 Datasheet

Current PartRFQ

91ER20KLF

TT Electronics/BIIn Stock: 92291ER20KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Bourns 3319P-1-203 is determined by the following critical parameters:

• Resistance Value: 20 kOhms (exact match required)
• Adjustment Type: Top Adjustment (functional requirement)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Termination Style: PC Pins (electrical connection method)
• Number of Turns: 1.0 (adjustment range)

The TT Electronics/BI 91ER20KLF qualifies as a substitute based on matching these core parameters. Secondary parameters including power rating, tolerance, temperature coefficient, and resistive material may differ within acceptable engineering margins for equivalent functionality.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 91ER20KLF serves as the primary substitute for the obsolete Bourns 3319P-1-203. Selection is supported by the following factors:

• Resistance Match: Both components provide 20 kOhms nominal resistance
• Functional Equivalence: Identical adjustment type (top), mounting method (through hole), and termination style (PC pins)
• Product Availability: The 91ER20KLF maintains active production status, ensuring supply continuity
• Compliance: Both components meet RoHS and REACH requirements; ECCN classification remains EAR99 for both parts
• Power Rating Enhancement: The substitute provides 0.5W rating compared to 0.2W, offering improved thermal margin in applications
• Tolerance Improvement: The 91ER20KLF provides ±20% tolerance versus ±25%, with superior temperature coefficient performance (±100ppm/°C versus ±1000ppm/°C)

Physical dimensions differ slightly; PCB layout verification is necessary to confirm mechanical fit within the allocated component space.

Frequently Asked Questions (FAQ)

Q: Can the TT Electronics/BI 91ER20KLF directly replace the Bourns 3319P-1-203 in existing designs?

A: Yes, provided that the physical dimensions (0.420" x 0.375" versus 0.433" x 0.354") fit within the PCB layout constraints. The electrical parameters—20 kOhms resistance, top adjustment, through-hole mounting, and PC pin termination—are functionally equivalent.

Q: What is the significance of the resistive material difference (carbon versus cermet)?

A: The Bourns 3319P-1-203 uses carbon film, while the 91ER20KLF uses cermet. Cermet construction typically provides improved stability and lower temperature coefficient performance, as reflected in the 91ER20KLF specifications (±100ppm/°C versus ±1000ppm/°C).

Q: Does the higher power rating of the substitute part affect circuit operation?

A: No. The 91ER20KLF 0.5W rating is a superset of the original 0.2W requirement. Higher power rating indicates greater thermal capacity and does not alter electrical behavior in applications designed for the lower rating.

Q: Are there packaging differences between these parts?

A: The Bourns 3319P-1-203 is listed as "-" packaging, while the 91ER20KLF is supplied in Bulk packaging. Both are through-hole components suitable for standard PCB assembly processes.

Q: What compliance certifications apply to the substitute part?

A: The TT Electronics/BI 91ER20KLF is RoHS Compliant and REACH Unaffected, matching the regulatory status of the original component. Both parts carry ECCN EAR99 classification.