Equivalent & Substitute Parts for 3309P-1-504

Part Overview

The Bourns 3309P-1-504 is a 500 kOhm, 0.5W through-hole trimmer potentiometer with cermet resistive material, top adjustment, and PC pin termination. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The 3309P series represents a legacy product line, and active substitute parts maintain the core electrical and mechanical specifications required for direct replacement in existing applications.

Substiute Parts

3309P-1-504

Bourns Inc.In Stock: 11793309P-1-504 Datasheet

Current PartRFQ

91AR500KLF

TT Electronics/BIIn Stock: 88591AR500KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3309P-1-504 is determined by strict alignment with the following core parameters:

• Resistance value: 500 kOhms (exact match required)
• Power rating: 0.5W minimum
• Resistive material: Cermet
• Number of turns: 1 turn
• Adjustment type: Top adjustment
• Mounting configuration: Through hole with PC pins
• Physical form factor: Rectangular package compatible with PCB layout

The TT Electronics/BI 91AR500KLF meets all substitution criteria. Both parts share identical electrical specifications for resistance, power handling, and adjustment characteristics. Physical dimensions differ slightly (9.78mm x 9.53mm versus 11.50mm x 9.00mm), which must be verified against PCB layout constraints before implementation.

Parameter Comparison

Engineering Selection Recommendations

The 91AR500KLF represents a direct functional substitute for the obsolete 3309P-1-504 based on matching electrical specifications and through-hole PC pin configuration. The substitute part offers improved tolerance (±20% versus ±25%) and superior temperature stability (±100ppm/°C versus ±250ppm/°C), providing enhanced performance characteristics in temperature-sensitive applications.

The 91AR500KLF maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity. Both parts carry equivalent environmental compliance certifications (RoHS and REACH unaffected status), supporting regulatory requirements.

Physical dimension differences require PCB layout verification. The substitute part's smaller footprint (9.78mm x 9.53mm versus 11.50mm x 9.00mm) may provide layout advantages in space-constrained designs but must be confirmed against existing mounting hole patterns and clearance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 91AR500KLF directly replace the 3309P-1-504 in existing designs?

A: Electrical substitution is valid based on matching resistance, power rating, adjustment type, and termination style. Physical dimensions must be verified against PCB layout constraints before implementation.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete versus active), tolerance specification (±25% versus ±20%), temperature coefficient (±250ppm/°C versus ±100ppm/°C), and physical dimensions. Electrical function and mounting configuration remain equivalent.

Q: Does the improved tolerance of the substitute part affect circuit performance?

A: The 91AR500KLF's tighter tolerance (±20%) and lower temperature coefficient (±100ppm/°C) provide enhanced stability and precision compared to the original part. Circuit performance will not be negatively affected; applications requiring tight tolerance control may benefit from the improved specifications.

Q: Are there packaging or supply considerations?

A: The 3309P-1-504 is obsolete with limited remaining inventory (1137 pcs). The 91AR500KLF is actively manufactured with current availability (862 pcs). For new designs or long-term production, the active substitute part is recommended.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS compliant and REACH unaffected. The 3309P-1-504 carries ROHS3 certification, while the 91AR500KLF carries standard RoHS certification. Both share identical ECCN (EAR99) and HTSUS (8533.40.8050) classifications.