Bourns 3318F-1-202 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3318F-1-202 is a 2 kOhms, 0.1W through-hole trimmer potentiometer with PC pin termination and top adjustment. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing production and maintenance applications. The 3318F series represents an open-frame design with carbon resistive material and 1-turn adjustment capability. Locating compatible alternatives ensures design continuity and supply chain reliability for applications requiring this resistance value and power rating.

Substiute Parts

3318F-1-202

Bourns Inc.In Stock: 8863318F-1-202 Datasheet

Current PartRFQ

3306F-1-202

Bourns Inc.In Stock: 47193306F-1-202 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns 3306F-1-202 qualifies as a direct substitute for the 3318F-1-202 based on the following alignment of critical parameters:

Matching Parameters:

• Resistance value: 2 kOhms (identical)
• Termination style: PC Pins (identical)
• Mounting type: Through Hole (identical)
• Adjustment type: Top Adjustment (identical)
• Number of turns: 1 (identical)
• RoHS compliance: ROHS3 Compliant (identical)

Allowable Variations:

• Power rating: 0.2W (1/5W) versus 0.1W (1/10W) — the substitute provides higher power dissipation capability, making it suitable for applications requiring the original 0.1W specification
• Tolerance: ±25% versus ±30% — the substitute offers tighter tolerance, improving accuracy
• Temperature coefficient: ±250ppm/°C versus ±1000ppm/°C — the substitute provides superior temperature stability
• Resistive material: Cermet versus Carbon — represents a material upgrade with improved performance characteristics
• Physical size: 0.319" x 0.268" Face (8.10mm x 6.80mm) versus 0.264" x 0.252" Face (6.70mm x 6.40mm) — slightly larger footprint requires PCB layout verification

Parameter Comparison

Engineering Selection Recommendations

The 3306F-1-202 is suitable as a substitute for the obsolete 3318F-1-202 in applications where the following conditions are met:

• PCB layout accommodates the larger physical dimensions (0.319" x 0.268" versus 0.264" x 0.252")
• The increased power rating (0.2W versus 0.1W) does not introduce thermal or performance concerns in the application
• The improved tolerance (±25% versus ±30%) and temperature coefficient (±250ppm/°C versus ±1000ppm/°C) are acceptable or beneficial
• Active product status of the 3306F-1-202 ensures ongoing availability and supply chain continuity

The 3306F-1-202 maintains full compliance with ROHS3 and REACH requirements, matching the regulatory status of the original component. Both parts are classified as Moisture Sensitivity Level 1 (Unlimited), indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the 3306F-1-202 directly replace the 3318F-1-202 without circuit modifications?

A: The 3306F-1-202 maintains identical resistance, termination, mounting, and adjustment specifications. However, the larger physical footprint requires PCB layout verification to confirm clearance and mounting hole alignment.

Q: What is the significance of the resistive material change from Carbon to Cermet?

A: Cermet material provides improved temperature stability (±250ppm/°C versus ±1000ppm/°C) and tighter tolerance (±25% versus ±30%), resulting in more stable performance across temperature ranges and better initial accuracy.

Q: Does the higher power rating of the 3306F-1-202 affect circuit operation?

A: The 0.2W rating of the 3306F-1-202 exceeds the 0.1W requirement of the original design. This provides additional thermal margin and does not negatively impact circuit performance when the application dissipates 0.1W or less.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 Compliant and REACH Unaffected. The 3306F-1-202 is an active product, ensuring continued availability and support, whereas the 3318F-1-202 is obsolete.

Q: What should be verified before implementing this substitution?

A: Confirm PCB layout compatibility with the larger dimensions, verify that circuit performance tolerates the improved but different tolerance specification, and test the substitute in the target application to ensure functional equivalence.