Bourns 3318F-1-102 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3318F-1-102 is a 1 kOhm, 0.1W through-hole trimmer potentiometer with PC pin termination and top adjustment. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 3318F series features carbon resistive material construction with a rectangular form factor measuring 0.264" x 0.252" (6.70mm x 6.40mm).

Substiute Parts

3318F-1-102

Bourns Inc.In Stock: 7823318F-1-102 Datasheet

Current PartRFQ

3306F-1-102

Bourns Inc.In Stock: 123083306F-1-102 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Bourns 3306F-1-102 qualifies as a direct substitute based on the following alignment of critical parameters:

Matching Parameters:

• Resistance value: 1 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)

Allowable Variations:

• Power rating: 0.2W (1/5W) versus 0.1W (1/10W) — higher power rating is acceptable for applications requiring the original 0.1W specification
• Tolerance: ±25% versus ±30% — tighter tolerance provides improved performance margin
• Temperature coefficient: ±250ppm/°C versus ±1000ppm/°C — superior thermal stability
• Resistive material: Cermet versus Carbon — different material technology with enhanced characteristics
• Physical size: 0.319" x 0.268" (8.10mm x 6.80mm) versus 0.264" x 0.252" (6.70mm x 6.40mm) — slightly larger footprint

Parameter Comparison

Engineering Selection Recommendations

The 3306F-1-102 is the active production equivalent for the obsolete 3318F-1-102. Both components maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

The 3306F-1-102 provides enhanced electrical performance through higher power dissipation capability (0.2W versus 0.1W), improved tolerance specification (±25% versus ±30%), and superior temperature stability (±250ppm/°C versus ±1000ppm/°C). The Cermet resistive material in the 3306F series offers greater reliability compared to the carbon construction of the 3318F series.

Physical footprint expansion from 6.70mm x 6.40mm to 8.10mm x 6.80mm requires PCB layout verification. Both components share identical functional characteristics: 1 kOhm resistance, single-turn adjustment, top-mounted potentiometer design, through-hole mounting, and PC pin termination.

Frequently Asked Questions (FAQ)

Q: Can the 3306F-1-102 directly replace the 3318F-1-102 in existing designs?

A: Yes, provided PCB layout accommodates the larger footprint (8.10mm x 6.80mm versus 6.70mm x 6.40mm). All electrical parameters and functional characteristics are compatible. The 3306F-1-102 offers superior performance specifications.

Q: What is the significance of the power rating difference (0.2W versus 0.1W)?

A: The 3306F-1-102 supports twice the power dissipation. Applications designed for 0.1W operation remain fully compatible, as the higher-rated component operates within the original thermal envelope with additional margin.

Q: How do the resistive materials differ between these parts?

A: The 3318F-1-102 uses carbon film construction, while the 3306F-1-102 employs Cermet (ceramic-metal composite) technology. Cermet provides improved stability, lower temperature coefficient (±250ppm/°C versus ±1000ppm/°C), and enhanced reliability for precision applications.

Q: Are both components RoHS compliant?

A: Yes. Both the 3318F-1-102 and 3306F-1-102 are ROHS3 compliant with unlimited moisture sensitivity ratings (MSL 1), ensuring compatibility with modern manufacturing and environmental standards.

Q: What tolerance specifications apply to each component?

A: The 3318F-1-102 specifies ±30% tolerance, while the 3306F-1-102 provides tighter ±25% tolerance. The 3306F-1-102 tolerance is more stringent, offering improved accuracy for applications requiring closer resistance values.

Q: Is PCB redesign required to use the 3306F-1-102 as a substitute?

A: PCB layout verification is necessary due to the increased footprint dimensions. The 3306F-1-102 measures 8.10mm x 6.80mm compared to the original 6.70mm x 6.40mm. Verify available board space and component clearances before implementation.