Bourns 3386T-1-104LF Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3386T-1-104LF is a 100 kOhm, 0.5W through-hole trimmer potentiometer with top adjustment, cermet resistive element, and PC pin termination. This component is classified as Active product status. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility parameters are maintained across the same functional category.

Substiute Parts

3386T-1-104LF

Bourns Inc.In Stock: 9733386T-1-104LF Datasheet

Current PartRFQ

25PR100KLF

TT Electronics / BI TechnologiesIn Stock: 282525PR100KLF Datasheet

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72PMR100KLF

TT Electronics/BIIn Stock: 79672PMR100KLF Datasheet

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M63P104KB40

Vishay SpectrolIn Stock: 1002M63P104KB40 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3386T-1-104LF is determined by the following critical parameters:

• Resistance value: 100 kOhms (exact match required)
• Power rating: 0.5W minimum
• Tolerance: ±10% or tighter
• Temperature coefficient: ±100ppm/°C or better
• Number of turns: 1 turn
• Resistive material: Cermet
• Mounting type: Through Hole
• Termination style: PC Pins
• Adjustment type: Top Adjustment (primary criterion for direct substitution)

Parts meeting all these criteria are classified as direct equivalents. Parts with alternative adjustment types (such as side adjustment) are noted as functional alternatives with mechanical installation differences.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Top Adjustment):

The 25PR100KLF and 72PMR100KLF meet all electrical and functional specifications for direct substitution. Both are manufactured by TT Electronics/BI Technologies and maintain identical electrical parameters. The 25PR100KLF features a smaller face dimension (0.270" x 0.270"), which may require PCB layout verification. The 72PMR100KLF maintains the same face dimension as the primary part (0.375" x 0.375"), providing the closest mechanical compatibility.

Functional Alternative (Side Adjustment):

The M63P104KB40 from Vishay Spectrol matches all electrical specifications but features side adjustment instead of top adjustment. This difference affects mechanical installation and access to the adjustment mechanism. The face dimension is slightly larger (0.395" x 0.395"). This part is suitable only when side adjustment orientation is acceptable for the application.

Compliance Status:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, consistent with the primary part. All parts carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can the 25PR100KLF replace the 3386T-1-104LF directly on the PCB?

A: The 25PR100KLF is electrically equivalent but has a smaller face dimension (0.270" x 0.270" versus 0.375" x 0.375"). PCB footprint and mounting hole spacing must be verified before substitution.

Q: What is the primary difference between the 72PMR100KLF and the 3386T-1-104LF?

A: The 72PMR100KLF is electrically and mechanically equivalent to the 3386T-1-104LF. The primary difference is packaging: the 3386T-1-104LF is supplied in Tube packaging, while the 72PMR100KLF is supplied in Bulk packaging.

Q: Why is the M63P104KB40 listed as a substitute if it has side adjustment?

A: The M63P104KB40 meets all electrical specifications and is mechanically compatible for through-hole mounting. However, the side adjustment orientation differs from the top adjustment of the primary part. This part is suitable only when the application design accommodates side-mounted adjustment access.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are RoHS compliant. The primary part and 72PMR100KLF are ROHS3 compliant, while the 25PR100KLF is RoHS compliant.

Q: What is the significance of the temperature coefficient specification?

A: The ±100ppm/°C temperature coefficient indicates the resistance change per degree Celsius across the operating temperature range. All listed parts share this specification, ensuring equivalent thermal stability in the application circuit.