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

Part Overview

The Bourns 3318K-1-502 is a 5 kOhm, 0.1W through-hole trimmer potentiometer with PC pin termination and side adjustment capability. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The 3318K series features carbon resistive material construction with a rectangular form factor optimized for compact PCB layouts.

Substiute Parts

3318K-1-502

Bourns Inc.In Stock: 10693318K-1-502 Datasheet

Current PartRFQ

3306K-1-502

Bourns Inc.In Stock: 27253306K-1-502 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3318K-1-502 is determined by the following critical parameters:

• Resistance Value: Must be 5 kOhms
• Termination Style: Must be PC Pins for direct PCB compatibility
• Mounting Type: Must be Through Hole
• Adjustment Type: Must be Side Adjustment
• Number of Turns: Must be 1 Turn

The Bourns 3306K-1-502 qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. While the 3306K series uses Cermet resistive material instead of carbon, and features improved power rating (0.2W vs 0.1W), tighter tolerance (±25% vs ±30%), and superior temperature coefficient (±250ppm/°C vs ±1000ppm/°C), these represent functional enhancements rather than incompatibilities. The 3306K maintains identical resistance, termination, mounting, and adjustment characteristics required for drop-in replacement.

Parameter Comparison

Engineering Selection Recommendations

The 3306K-1-502 is the appropriate substitute for the obsolete 3318K-1-502. Both components maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory and environmental compatibility. The 3306K series is currently in active production status, providing assured supply and long-term availability.

The 3306K-1-502 offers superior electrical performance characteristics through Cermet resistive material technology, delivering higher power dissipation capability (0.2W vs 0.1W), improved tolerance accuracy (±25% vs ±30%), and significantly better temperature stability (±250ppm/°C vs ±1000ppm/°C). These enhancements are backward-compatible with applications originally designed for the 3318K-1-502.

Physical dimensions show minor variation (0.268" x 0.319" vs 0.264" x 0.252"), requiring verification of PCB layout clearances in space-constrained applications. Both components utilize identical PC pin termination and side adjustment mechanisms, ensuring functional interchangeability.

Frequently Asked Questions (FAQ)

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

A: Yes. Both components share identical resistance value (5 kOhms), termination style (PC Pins), mounting type (Through Hole), adjustment type (Side Adjustment), and number of turns (1). The 3306K-1-502 provides enhanced electrical performance and is currently in active production.

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

A: The 3306K-1-502 uses Cermet material, which provides superior temperature stability (±250ppm/°C vs ±1000ppm/°C) and higher power rating (0.2W vs 0.1W). This represents a functional improvement for applications requiring better thermal performance and stability.

Q: Are there physical compatibility concerns with the 3306K-1-502?

A: The 3306K-1-502 has slightly larger dimensions (0.268" x 0.319" vs 0.264" x 0.252"). PCB layout verification is necessary to confirm adequate clearance in space-constrained designs. Both components use identical PC pin termination spacing.

Q: Do both components meet the same regulatory requirements?

A: Yes. Both the 3318K-1-502 and 3306K-1-502 are ROHS3 compliant with MSL rating 1 (Unlimited), ensuring equivalent regulatory and environmental compliance.

Q: Why is the 3318K-1-502 listed as obsolete?

A: The 3318K series has been superseded by the 3306K series, which offers improved electrical characteristics and performance. The 3306K-1-502 is the current production equivalent.