Bourns 3318F-1-501 Trimmer Potentiometer - Equivalent & Substitute Parts

Part Overview

The Bourns 3318F-1-501 is a 500 Ohm, 0.1W through-hole trimmer potentiometer with top adjustment, featuring PC pin termination and carbon resistive material. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing production and maintenance applications. The 3318 series represents an open-frame design optimized for applications requiring compact, adjustable resistance in legacy electronic assemblies.

Substiute Parts

3318F-1-501

Bourns Inc.In Stock: 11023318F-1-501 Datasheet

Current PartRFQ

3306F-1-501

Bourns Inc.In Stock: 25083306F-1-501 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns 3306F-1-501 qualifies as a direct substitute based on the following alignment of critical parameters:

Matching Parameters:

• Resistance value: 500 Ohms (identical)
• Number of turns: 1 (identical)
• Adjustment type: Top Adjustment (identical)
• Mounting type: Through Hole (identical)
• Termination style: PC Pins (identical)
• RoHS compliance: ROHS3 Compliant (identical)
• MSL rating: 1 (Unlimited) (identical)

Allowable Variations:

• Power rating: 0.2W (1/5W) vs. 0.1W (higher rating acceptable for same resistance value)
• Tolerance: ±25% vs. ±30% (tighter tolerance acceptable)
• Temperature coefficient: ±250ppm/°C vs. ±1000ppm/°C (improved stability acceptable)
• Resistive material: Cermet vs. Carbon (functionally equivalent for this resistance class)
• Physical size: 0.319" x 0.268" (8.10mm x 6.80mm) vs. 0.264" x 0.252" (6.70mm x 6.40mm) (larger footprint requires PCB layout verification)

Parameter Comparison

Engineering Selection Recommendations

The 3306F-1-501 is suitable as a substitute for the obsolete 3318F-1-501 in applications where the following conditions are met:

• PCB layout accommodates the larger footprint (0.319" x 0.268" vs. 0.264" x 0.252")
• Circuit design tolerates the improved performance characteristics (lower temperature coefficient, tighter tolerance, higher power rating)
• The active product status of the 3306F-1-501 ensures ongoing availability and supply chain continuity
• Both parts maintain identical RoHS3 compliance and MSL ratings, supporting equivalent environmental and reliability requirements

The 3306F-1-501 represents a direct functional replacement with enhanced specifications, eliminating the risk of obsolescence associated with the 3318F-1-501.

Frequently Asked Questions (FAQ)

Q: Can the 3306F-1-501 be used as a direct pin-for-pin replacement?

A: Yes. Both parts feature identical PC pin termination, through-hole mounting, and top adjustment configuration. However, the larger physical footprint of the 3306F-1-501 requires verification that PCB layout accommodates the increased dimensions.

Q: What is the significance of the resistive material difference (Carbon vs. Cermet)?

A: Both carbon and cermet materials are functionally equivalent for 500 Ohm trimmer potentiometers. The cermet material in the 3306F-1-501 provides improved temperature stability (±250ppm/°C vs. ±1000ppm/°C), which is beneficial in temperature-sensitive applications.

Q: Does the higher power rating of the 3306F-1-501 affect circuit operation?

A: No. A higher power rating (0.2W vs. 0.1W) indicates greater thermal capacity and does not negatively impact circuit performance. The substitute can safely handle the same or lower power dissipation as the original part.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant with MSL rating 1 (Unlimited). No compliance or certification differences exist between the two parts.

Q: What should be verified before implementing the 3306F-1-501 as a substitute?

A: Verify PCB layout clearance for the larger footprint. Confirm that the tighter tolerance (±25%) and improved temperature coefficient (±250ppm/°C) are compatible with circuit requirements. No additional testing or verification is required for functional substitution.