Equivalent & Substitute Parts for Bourns 3309P-1-502

Part Overview

The Bourns 3309P-1-502 is a 5 kOhm, 0.5W through-hole trimmer potentiometer with PC pin termination and top adjustment. This component is classified as obsolete, making identification of functionally equivalent substitutes essential for ongoing maintenance, repair, and legacy system support. The Trimpot® 3309 series represents a established design in open-frame trimmer potentiometer applications where precise resistance adjustment and compact form factor are required.

Substiute Parts

3309P-1-502

Bourns Inc.In Stock: 11483309P-1-502 Datasheet

Current PartRFQ

91BR5KLF

TT Electronics/BIIn Stock: 77991BR5KLF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3309P-1-502 is determined by the following critical parameters:

• Resistance Value: Must be 5 kOhms
• Power Rating: Must be 0.5W (1/2W) minimum
• Mounting Type: Must be through-hole with PC pin termination
• Adjustment Type: Must be top adjustment
• Resistive Material: Must be Cermet
• Number of Turns: Must be 1 turn

The TT Electronics/BI 91BR5KLF meets all core electrical and mechanical requirements for direct substitution. Both components share identical resistance, power rating, termination style, and adjustment mechanism. Dimensional differences are minor and do not prevent PCB mounting compatibility in standard through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 91BR5KLF is a direct functional equivalent for the obsolete Bourns 3309P-1-502. Selection criteria are based on the following factors:

Electrical Compatibility: Both components provide identical 5 kOhm resistance and 0.5W power handling. The 91BR5KLF exhibits superior tolerance (±20% versus ±25%) and lower temperature coefficient (±100ppm/°C versus ±250ppm/°C), resulting in improved stability across operating conditions.

Mechanical Compatibility: PC pin termination and through-hole mounting are identical. Dimensional variation is minor; the 91BR5KLF is slightly smaller, which presents no obstruction in standard PCB layouts.

Compliance and Availability: The 91BR5KLF maintains active product status with current manufacturing support and RoHS compliance certification. The 3309P-1-502 is obsolete with no ongoing production.

Frequently Asked Questions (FAQ)

Q: Can the TT Electronics/BI 91BR5KLF replace the Bourns 3309P-1-502 in existing designs?

A: Yes. Both components share identical electrical specifications (5 kOhms, 0.5W, 1-turn top adjustment) and mechanical interfaces (PC pin through-hole termination). The 91BR5KLF is dimensionally smaller but compatible with standard PCB hole spacing.

Q: What are the tolerance differences between these parts?

A: The 3309P-1-502 specifies ±25% tolerance, while the 91BR5KLF specifies ±20%. The tighter tolerance of the substitute part provides improved initial accuracy without requiring circuit redesign.

Q: How do temperature coefficients affect substitution?

A: The 3309P-1-502 has a temperature coefficient of ±250ppm/°C, while the 91BR5KLF is ±100ppm/°C. The lower coefficient of the substitute indicates reduced resistance drift over temperature range, improving long-term stability in temperature-sensitive applications.

Q: Are there packaging considerations for this substitution?

A: The 3309P-1-502 is supplied in standard packaging, while the 91BR5KLF is supplied in bulk packaging. Both are through-hole components with identical pin configurations, requiring no PCB layout modifications.

Q: What is the compliance status of the substitute part?

A: The 91BR5KLF is RoHS compliant and REACH unaffected, meeting current environmental and regulatory requirements. The 3309P-1-502 is ROHS3 compliant, indicating both parts satisfy modern compliance standards.