Bourns 3318F-1-502 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3318F-1-502 is a 5 kOhm, 0.1W through-hole trimmer potentiometer with PC pin termination and top adjustment. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The 3318F series features carbon resistive material construction in a compact rectangular form factor suitable for PC board mounting.

Substiute Parts

3318F-1-502

Bourns Inc.In Stock: 602733318F-1-502 Datasheet

Current PartRFQ

3306F-1-502

Bourns Inc.In Stock: 78923306F-1-502 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns 3306F-1-502 qualifies as a direct substitute based on the following matching parameters:

• Resistance value: 5 kOhms (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)

The 3306F-1-502 represents an upgrade path from the obsolete 3318F-1-502, offering improved specifications while maintaining functional compatibility in the same circuit application space.

Parameter Comparison

Engineering Selection Recommendations

The 3306F-1-502 is the active production equivalent for the obsolete 3318F-1-502. Both components maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory continuity. The 3306F-1-502 offers enhanced performance characteristics: higher power dissipation capacity (0.2W vs. 0.1W), improved tolerance (±25% vs. ±30%), and superior temperature stability (±250ppm/°C vs. ±1000ppm/°C). The shift from carbon to cermet resistive material in the substitute provides greater long-term reliability and temperature performance.

Physical dimensions differ slightly; the 3306F-1-502 is marginally larger (0.319" x 0.268" vs. 0.264" x 0.252"). PCB layout verification is required to confirm fit within existing mounting footprints. Both components share identical electrical interface characteristics: 5 kOhm resistance, single-turn top adjustment, through-hole PC pin termination, and 1-turn operation.

Frequently Asked Questions (FAQ)

Q: Can the 3306F-1-502 directly replace the 3318F-1-502 in existing designs?

A: Yes, from an electrical and functional standpoint. The 5 kOhm resistance, single-turn adjustment, and PC pin termination are identical. Physical dimensions require PCB layout verification due to the slightly larger footprint of the 3306F-1-502.

Q: What are the key differences between these two parts?

A: The primary differences are power rating (0.2W vs. 0.1W), tolerance (±25% vs. ±30%), temperature coefficient (±250ppm/°C vs. ±1000ppm/°C), resistive material (cermet vs. carbon), and physical size. The 3306F-1-502 represents an improved specification across all performance metrics.

Q: Why is the 3318F-1-502 obsolete?

A: The 3318F-1-502 has been discontinued by Bourns Inc. The 3306F-1-502 serves as the active production replacement with superior performance characteristics.

Q: Are there any compliance concerns with substitution?

A: No. Both components are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings of 1 (Unlimited). Regulatory compliance is maintained across the substitution.

Q: Does the larger size of the 3306F-1-502 affect circuit performance?

A: Physical size does not affect electrical performance. However, PCB layout space must accommodate the larger footprint (0.319" x 0.268" vs. 0.264" x 0.252"). Mechanical clearance verification is necessary before implementation.

Q: What is the significance of the resistive material change from carbon to cermet?

A: Cermet construction provides improved temperature stability and long-term reliability compared to carbon. The temperature coefficient improves from ±1000ppm/°C to ±250ppm/°C, resulting in more stable resistance values across operating temperature ranges.