Equivalent & Substitute Parts for Bourns 3309P-1-501

Part Overview

The Bourns 3309P-1-501 is a 500 Ohm, 0.5W trimmer potentiometer with PC pin termination and top adjustment. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production and maintenance applications. The 3309P series represents a legacy design in the Trimpot® product line, and equivalent substitutes must maintain electrical performance and mechanical compatibility within specified tolerance ranges.

Substiute Parts

3309P-1-501

Bourns Inc.In Stock: 10053309P-1-501 Datasheet

Current PartRFQ

91BR500LF

TT Electronics/BIIn Stock: 107291BR500LF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3309P-1-501 is determined by strict equivalence across the following critical parameters:

• Resistance value: 500 Ohms (exact match required)
• Power rating: 0.5W minimum
• Adjustment type: Top adjustment (mechanical compatibility)
• Termination style: PC pins (board-level compatibility)
• Mounting type: Through hole (assembly compatibility)
• Resistive material: Cermet (performance characteristics)
• Number of turns: 1 turn (adjustment range)

The TT Electronics/BI 91BR500LF meets all mandatory substitution criteria. Tolerance and temperature coefficient variations fall within acceptable ranges for general trimmer potentiometer applications where the 3309P-1-501 was originally specified.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 91BR500LF is the qualified substitute for the Bourns 3309P-1-501 based on the following engineering criteria:

• Electrical equivalence: Identical resistance, power rating, and adjustment characteristics
• Mechanical compatibility: PC pin termination and through-hole mounting enable direct board-level substitution
• Regulatory compliance: Both components meet RoHS and REACH requirements; the substitute maintains ECCN EAR99 classification
• Product availability: The 91BR500LF is in active production status, ensuring long-term supply continuity
• Performance improvement: The substitute offers tighter tolerance (±20% vs ±25%) and superior temperature stability (±100ppm/°C vs ±250ppm/°C)
• Physical footprint: The 91BR500LF has a smaller face dimension, which may require PCB layout verification for existing designs

Frequently Asked Questions (FAQ)

Q: Can the TT Electronics/BI 91BR500LF be used as a direct replacement for the Bourns 3309P-1-501?

A: Yes. Both components share identical electrical specifications (500 Ohms, 0.5W, 1 turn, top adjustment, cermet material) and mechanical interfaces (PC pins, through-hole mounting). The substitute is electrically and mechanically compatible for board-level substitution.

Q: What are the differences between these two parts?

A: The primary differences are product status (obsolete vs. active), tolerance (±25% vs. ±20%), temperature coefficient (±250ppm/°C vs. ±100ppm/°C), and face dimensions (0.453" x 0.354" vs. 0.385" x 0.375"). The substitute offers improved performance specifications and active production status.

Q: Does the smaller footprint of the 91BR500LF affect compatibility?

A: The 91BR500LF has a smaller face dimension. PCB layout verification is required to confirm that the reduced footprint does not conflict with adjacent components or mounting structures in existing designs.

Q: Are both parts RoHS and REACH compliant?

A: Yes. The Bourns 3309P-1-501 is ROHS3 Compliant, and the TT Electronics/BI 91BR500LF is RoHS Compliant. Both are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Why is the original part obsolete?

A: The Bourns 3309P-1-501 is classified as obsolete, indicating it is no longer in active production. The TT Electronics/BI 91BR500LF represents the current-generation equivalent in active production.