Bourns 3309P-1-104 Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3309P-1-104 is a 100 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 alternatives necessary for ongoing design support and procurement planning. The 3309P series represents a legacy product line in the Trimpot® family, and equivalent substitutes maintain the same electrical performance and mechanical interface specifications.

Substiute Parts

3309P-1-104

Bourns Inc.In Stock: 9693309P-1-104 Datasheet

Current PartRFQ

37PR100KLF

TT Electronics/BIIn Stock: 93037PR100KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3309P-1-104 is determined by the following critical parameters:

• Resistance Value: 100 kOhms (exact match required)
• Power Rating: 0.5W / 1/2W (exact match required)
• Termination Style: PC Pins through-hole (exact match required)
• Adjustment Type: Top Adjustment (exact match required)
• Resistive Material: Cermet (exact match required)
• Number of Turns: 1 turn (exact match required)
• Temperature Coefficient: ±250ppm/°C (exact match required)
• Physical Dimensions: Rectangular form factor with compatible face dimensions

The TT Electronics/BI 37PR100KLF meets all critical substitution criteria. While tolerance differs (±20% vs. ±25%), this represents an improvement in specification and does not prevent functional equivalence. Physical dimensions are within acceptable tolerance (11.50mm x 8.80mm vs. 11.50mm x 9.00mm), maintaining PCB layout compatibility.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 37PR100KLF is the qualified substitute for the Bourns 3309P-1-104. Selection is based on:

• Electrical Equivalence: All critical electrical parameters match exactly, including resistance, power rating, temperature coefficient, and number of turns.
• Mechanical Compatibility: PC pin termination and through-hole mounting are identical. Face dimensions are within acceptable tolerance for PCB layout compatibility.
• Product Status: The 37PR100KLF is active in production, ensuring long-term availability and supply chain continuity compared to the obsolete 3309P-1-104.
• Regulatory Compliance: Both components maintain RoHS and REACH compliance status, with no regulatory barriers to substitution.
• Tolerance Improvement: The 37PR100KLF tolerance of ±20% represents a tighter specification than the original ±25%, providing improved performance without design modification.

Frequently Asked Questions (FAQ)

Q: Can the TT Electronics/BI 37PR100KLF be used as a direct replacement for the Bourns 3309P-1-104?

A: Yes. The 37PR100KLF meets all critical electrical and mechanical specifications. Identical resistance, power rating, termination style, and adjustment type ensure functional equivalence. The 0.2mm difference in face height (9.00mm vs. 8.80mm) does not affect PCB mounting or circuit performance.

Q: Why does the tolerance differ between the two parts?

A: The 37PR100KLF specifies ±20% tolerance compared to the 3309P-1-104's ±25%. This represents an improvement in manufacturing precision and does not prevent substitution. If your circuit design requires the original ±25% tolerance band, the tighter ±20% specification remains compatible.

Q: Are there any compliance concerns with substitution?

A: No. Both components are RoHS and REACH compliant. No regulatory or environmental barriers exist to substitution.

Q: What is the primary reason for substitution?

A: The Bourns 3309P-1-104 is obsolete. The TT Electronics/BI 37PR100KLF is an active product with confirmed inventory and ongoing manufacturing support, ensuring reliable procurement for new designs and legacy system maintenance.

Q: Are the PC pin configurations identical?

A: Yes. Both components use PC pin termination for through-hole mounting. Pin spacing and configuration are compatible with standard PCB layouts designed for the 3309P series.