Bourns 3299X-1-503 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3299X-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer with PC pin termination and side adjustment capability. This sealed Trimpot® 3299 series component is designed for applications requiring precision resistive adjustment in compact rectangular form factors. The part is currently active in production with 1044 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part number becomes unavailable or when alternative compliance certifications are required.

Substiute Parts

3299X-1-503

Bourns Inc.In Stock: 10773299X-1-503 Datasheet

Current PartRFQ

3296X-1-503

Bourns Inc.In Stock: 25903296X-1-503 Datasheet

DirectRFQ

3299X-1-503LF

Bourns Inc.In Stock: 13443299X-1-503LF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3299X-1-503 are qualified based on electrical and mechanical parameter equivalence within the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 50 kOhms
• Power rating: 0.5W (1/2W)
• Tolerance: ±10%
• Temperature coefficient: ±100ppm/°C
• Number of turns: 25
• Resistive material: Cermet

Mechanical Parameters (Must Match):

• Adjustment type: Side Adjustment
• Mounting type: Through Hole
• Termination style: PC Pins
• Packaging: Tube
• Manufacturer: Bourns Inc.

Allowable Variations:

• Face dimensions: Rectangular form factor with minor dimensional differences permitted within the 3299 and 3296 series envelope specifications
• RoHS compliance status: Substitutes may differ in RoHS certification level
• Series designation: Both Trimpot® 3299 and Trimpot® 3296 series qualify as substitutes

Parameter Comparison

Engineering Selection Recommendations

3299X-1-503LF Selection Criteria: The 3299X-1-503LF is functionally equivalent to the main part number with identical electrical specifications and face dimensions. This substitute is recommended for applications requiring ROHS3 compliance. Both parts belong to the Trimpot® 3299 sealed series and maintain identical mechanical interfaces.

3296X-1-503 Selection Criteria: The 3296X-1-503 provides electrical equivalence with all specified parameters matching the main part. This substitute belongs to the Trimpot® 3296 sealed series and features a reduced face height (0.190" versus 0.240"). Selection of this part is appropriate for space-constrained applications where the narrower profile accommodates design requirements. RoHS compliance status remains non-compliant, matching the main part.

Compliance Considerations:

• For designs requiring ROHS3 compliance, the 3299X-1-503LF is the appropriate selection
• For designs with no RoHS requirement or existing RoHS non-compliant specifications, all three parts are equivalent
• All parts maintain REACH affected status and EAR99 ECCN classification

Frequently Asked Questions (FAQ)

Q: Can the 3296X-1-503 be used as a direct replacement for the 3299X-1-503?

A: Yes, the 3296X-1-503 is electrically equivalent with identical resistance, power rating, tolerance, temperature coefficient, and turn count. The primary difference is the reduced face height (0.190" versus 0.240"). Substitution is valid provided the narrower profile accommodates the physical space constraints of the application.

Q: What is the difference between the 3299X-1-503 and 3299X-1-503LF?

A: Both parts are identical in electrical specifications and physical dimensions. The primary distinction is RoHS compliance: the 3299X-1-503LF is ROHS3 compliant, while the 3299X-1-503 is RoHS non-compliant. Select the LF variant for applications requiring RoHS3 certification.

Q: Are all three parts compatible with the same PCB footprint?

A: The 3299X-1-503 and 3299X-1-503LF share identical face dimensions and are fully compatible with the same footprint. The 3296X-1-503 has a reduced face height and may require footprint verification, though all three parts use identical PC pin termination and through-hole mounting.

Q: Which substitute part has the highest inventory availability?

A: The 3296X-1-503 has 2576 units in stock, compared to 1044 units for the 3299X-1-503 and 1235 units for the 3299X-1-503LF.

Q: Do all substitute parts maintain the same adjustment characteristics?

A: Yes. All three parts feature 25-turn side adjustment with identical temperature coefficient (±100ppm/°C) and cermet resistive material, ensuring consistent adjustment resolution and performance across all substitutes.