Bourns 3309P-1-101 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3309P-1-101 is a 100 Ohm, 0.5W through-hole trimmer potentiometer with PC pin termination and top adjustment. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing production support and design continuity. The part operates as a precision variable resistor suitable for circuit calibration and adjustment applications in electronic equipment.

Substiute Parts

3309P-1-101

Bourns Inc.In Stock: 8093309P-1-101 Datasheet

Current PartRFQ

37PR100LF

TT Electronics/BIIn Stock: 104837PR100LF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3309P-1-101 is determined by strict equivalence across the following critical parameters:

• Resistance value: 100 Ohms (exact match required)
• Power rating: 0.5W minimum
• Termination style: PC Pins (through-hole compatible)
• Adjustment type: Top Adjustment
• Resistive material: Cermet
• Number of turns: 1 turn
• Temperature coefficient: ±250ppm/°C or better
• Physical form factor: Rectangular configuration compatible with 0.453" x 0.354" mounting footprint

The TT Electronics/BI 37PR100LF meets all substitution criteria. Tolerance variation (±20% vs. ±25%) represents an improvement in specification and does not preclude substitution. Dimensional variance (0.346" vs. 0.354" height) remains within acceptable through-hole mounting tolerances.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 37PR100LF is a direct functional substitute for the obsolete Bourns 3309P-1-101. Selection is supported by the following factors:

• Active product status ensures ongoing availability and supply chain continuity
• RoHS compliance maintained across both components
• All critical electrical parameters match or exceed original specifications
• Physical dimensions remain compatible with existing through-hole PCB layouts
• Tolerance improvement (±20% vs. ±25%) provides enhanced circuit performance without design modification

No design changes are required for component substitution. PCB footprints, schematic designations, and circuit calculations remain valid.

Frequently Asked Questions (FAQ)

Q: Can the 37PR100LF be used as a direct replacement without PCB modification?

A: Yes. The 37PR100LF maintains identical electrical specifications and compatible physical dimensions. No PCB layout changes are necessary.

Q: What is the significance of the tolerance difference (±20% vs. ±25%)?

A: The 37PR100LF tolerance of ±20% is tighter than the original ±25%. This represents improved component accuracy and is fully compatible with circuits designed for the original part.

Q: Are there any compliance or certification differences between these parts?

A: Both components are RoHS compliant and REACH unaffected. The original part carries ROHS3 certification while the substitute carries standard RoHS certification. Both meet environmental regulatory requirements.

Q: Does the 0.008" height difference (0.354" vs. 0.346") affect mounting?

A: No. The dimensional variance falls within standard through-hole PCB tolerance ranges and does not impact mechanical or electrical performance.

Q: Why is the original Bourns part obsolete?

A: Product obsolescence is determined by manufacturer discontinuation. The TT Electronics/BI 37PR100LF remains in active production and provides equivalent functionality.