Bourns 3319P-1-504 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3319P-1-504 is a 500 kOhm through-hole trimmer potentiometer rated at 0.2W with top adjustment capability. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing production and maintenance applications. The part features PC pin termination, carbon resistive material, and rectangular form factor suitable for printed circuit board integration.

Substiute Parts

3319P-1-504

Bourns Inc.In Stock: 12133319P-1-504 Datasheet

Current PartRFQ

37PR500KLF

TT Electronics/BIIn Stock: 94537PR500KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Bourns 3319P-1-504 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Resistance value: 500 kOhms (exact match required)
• Termination style: PC Pins (exact match required)
• Mounting type: Through Hole (exact match required)
• Adjustment type: Top Adjustment (exact match required)
• Number of turns: 1.0 (exact match required)

Secondary Compatibility Criteria (Allowable Variation):

• Power rating: Substitute must equal or exceed 0.2W minimum
• Tolerance: Substitute tolerance of ±20% or better is acceptable
• Temperature coefficient: Substitute with lower temperature coefficient (±250ppm/°C) provides improved stability
• Resistive material: Cermet material acceptable as functional equivalent to carbon
• Physical dimensions: Minor variations within standard PCB layout tolerances are acceptable

The TT Electronics/BI 37PR500KLF meets all primary criteria and exceeds secondary criteria, qualifying as a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 37PR500KLF is the qualified substitute for the obsolete Bourns 3319P-1-504. Selection is based on the following engineering factors:

Product Status: The substitute part is actively manufactured and available, addressing the obsolescence of the original component.

Electrical Compatibility: Resistance, tolerance, and termination specifications are identical or superior. The substitute's higher power rating (0.5W vs. 0.2W) provides additional thermal margin without affecting circuit function.

Environmental Compliance: Both parts maintain RoHS compliance. The substitute's improved temperature coefficient (±250ppm/°C vs. ±1000ppm/°C) provides enhanced performance stability across operating temperature ranges.

Physical Integration: Dimensional differences are minimal and fall within standard PCB layout tolerances for through-hole components with PC pin termination.

Material Consideration: Cermet resistive material in the substitute provides equivalent functional performance to the original carbon material while supporting the improved electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can the TT Electronics/BI 37PR500KLF be used as a direct replacement without circuit modification?

A: Yes. The substitute meets all primary electrical and mechanical specifications. The higher power rating and improved temperature coefficient represent performance enhancements rather than deviations from the original design intent.

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

A: Cermet material provides superior temperature stability and tolerance characteristics compared to carbon. This change improves overall circuit performance while maintaining functional equivalence at the 500 kOhm resistance value.

Q: Are there any PCB layout considerations when substituting this component?

A: Dimensional variations between the two parts are minimal (0.02" and 0.008" differences in length and width respectively). Standard through-hole PCB layouts accommodate both components without modification.

Q: Does the substitute part maintain the same compliance certifications?

A: Both parts are RoHS compliant. The substitute maintains REACH Unaffected status and EAR99 ECCN classification, consistent with the original component.

Q: Why does the substitute have a higher power rating?

A: The 0.5W rating of the substitute reflects improved thermal design in the Cermet technology. This does not affect circuit operation and provides additional safety margin in applications where the original 0.2W rating was adequate.