Bourns 3299X-1-105 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3299X-1-105 is a 1 MOhm, 0.5W sealed trimmer potentiometer with PC pin termination and side adjustment capability. This through-hole component utilizes cermet resistive material and features 25-turn adjustment resolution. The part is currently active in production with 708 units in stock. Substitute parts are necessary to address inventory availability, compliance requirements, or dimensional constraints in specific application layouts.

Substiute Parts

3299X-1-105

Bourns Inc.In Stock: 7713299X-1-105 Datasheet

Current PartRFQ

3296X-1-105

Bourns Inc.In Stock: 10073296X-1-105 Datasheet

DirectRFQ

3299X-1-105LF

Bourns Inc.In Stock: 19553299X-1-105LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3299X-1-105 is determined by matching the following critical parameters: resistance value (1 MOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (25), adjustment type (side adjustment), resistive material (cermet), mounting type (through hole), and termination style (PC pins).

Two substitute parts meet these criteria:

3299X-1-105LF: Identical electrical and mechanical specifications to the main part. Differs only in RoHS compliance status (ROHS3 Compliant vs. RoHS non-compliant). Same series, same footprint dimensions (0.395" x 0.240" face).

3296X-1-105: Matches all electrical specifications and core mechanical parameters. Belongs to the Trimpot® 3296 series instead of 3299 series. Face dimension differs: 0.395" x 0.190" (narrower profile) compared to the main part's 0.395" x 0.240".

Parameter Comparison

Engineering Selection Recommendations

3299X-1-105LF is the primary substitute when RoHS3 compliance is required. It maintains identical footprint and electrical characteristics while providing enhanced environmental compliance. Higher inventory availability (1900 units) supports supply chain continuity.

3296X-1-105 is suitable for applications where board space constraints require a narrower profile (0.190" vs. 0.240" face height). All electrical parameters remain equivalent. This option is appropriate only when the reduced footprint dimension does not conflict with mechanical assembly requirements or PCB layout specifications.

Selection between substitutes depends on compliance mandates and physical space availability. Both maintain full electrical equivalence to the main part across all specified parameters.

Frequently Asked Questions (FAQ)

Q: Can 3299X-1-105LF be used as a direct replacement for 3299X-1-105?

A: Yes. Both parts are electrically and mechanically identical. The LF variant adds ROHS3 compliance. No circuit modifications or recalibration are required.

Q: What is the primary difference between 3299X-1-105 and 3296X-1-105?

A: The 3296X-1-105 has a narrower face dimension (0.190" height vs. 0.240" height). All electrical specifications are identical. Substitution is valid only if the reduced height does not conflict with PCB layout or mechanical clearance requirements.

Q: Are all three parts from the same manufacturer?

A: Yes. All three parts are manufactured by Bourns Inc. and belong to the Trimpot® sealed trimmer potentiometer family.

Q: Do the substitute parts have the same resistance tolerance and temperature coefficient?

A: Yes. All three parts share identical tolerance (±10%) and temperature coefficient (±100ppm/°C) specifications.

Q: Which substitute has the best inventory availability?

A: The 3299X-1-105LF has the highest stock level at 1900 units, compared to 963 units for 3296X-1-105 and 708 units for the main part.

Q: Are there any compliance differences between the substitutes?

A: Yes. The 3299X-1-105LF is ROHS3 compliant, while both 3299X-1-105 and 3296X-1-105 are RoHS non-compliant. All three are REACH Affected.

Q: Can I use 3296X-1-105 in a space-constrained application?

A: Yes, provided the narrower 0.190" face dimension is compatible with your PCB layout and mechanical assembly. Verify clearance with adjacent components before implementation.