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

Part Overview

The Bourns 3299P-1-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer with PC pin termination and side adjustment. 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 1100 units in stock. Substitute parts may be required due to supply constraints, design revisions, or compliance requirement changes between manufacturing batches.

Key Parameters

Parameter	Value
Resistance	50 kOhms
Power Rating	0.5W (1/2W)
Tolerance	±10%
Temperature Coefficient	±100ppm/°C
Number of Turns	25
Adjustment Type	Side Adjustment
Resistive Material	Cermet
Mounting Type	Through Hole
Termination Style	PC Pins
Manufacturer	Bourns Inc.

Substitute Part Grouping Explanation

Substitution eligibility for the 3299P-1-503 is determined by matching the following critical parameters: 50 kOhm resistance value, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 25-turn adjustment, side adjustment type, cermet resistive material, through-hole mounting, and PC pin termination. All identified substitutes maintain these electrical and mechanical specifications. Dimensional variations exist between series, but do not affect functional compatibility in applications designed for the 3299P-1-503 footprint envelope.

Parameter Comparison

Parameter	3299P-1-503	3296P-1-503	3299P-1-503LF	PV36P503C01B00
Resistance	50 kOhms	50 kOhms	50 kOhms	50 kOhms
Power Rating	0.5W	0.5W	0.5W	0.5W
Tolerance	±10%	±10%	±10%	±10%
Temperature Coefficient	±100ppm/°C	±100ppm/°C	±100ppm/°C	±100ppm/°C
Number of Turns	25	25	25	25
Adjustment Type	Side Adjustment	Side Adjustment	Side Adjustment	Side Adjustment
Resistive Material	Cermet	Cermet	Cermet	Cermet
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Termination Style	PC Pins	PC Pins	PC Pins	PC Pins
Series	Trimpot® 3299 - Sealed	Trimpot® 3296 - Sealed	Trimpot® 3299 - Sealed	PV36
Face Dimension	0.240" x 0.375" (6.10mm x 9.53mm)	0.375" x 0.190" (9.53mm x 4.83mm)	0.240" x 0.375" (6.10mm x 9.53mm)	0.378" x 0.197" (9.60mm x 5.00mm)
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Inventory	1100 Pcs	1322 Pcs	1295 Pcs	805 Pcs

Engineering Selection Recommendations

All four parts maintain identical electrical specifications and are suitable for direct substitution based on functional parameters. Selection between alternatives should consider compliance requirements: the 3299P-1-503LF and PV36P503C01B00 are ROHS3 compliant, while the 3299P-1-503 and 3296P-1-503 are RoHS non-compliant. For new designs or applications with RoHS compliance mandates, the 3299P-1-503LF is the preferred substitute, as it maintains the same series designation and identical footprint as the main part. The 3296P-1-503 offers an alternative within the Trimpot® sealed family but features different dimensional characteristics. The PV36P503C01B00 represents a cross-series option with comparable performance and RoHS3 compliance.

Frequently Asked Questions (FAQ)

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

A: The 3296P-1-503 matches all electrical parameters but has different face dimensions (0.375" x 0.190" versus 0.240" x 0.375"). Substitution is electrically valid but requires verification of mechanical fit within the target application's layout constraints.

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

A: Both parts are identical in electrical and mechanical specifications. The 3299P-1-503LF carries ROHS3 compliance certification, while the 3299P-1-503 is RoHS non-compliant. The "LF" designation indicates lead-free processing.

Q: Is the PV36P503C01B00 compatible with PCB layouts designed for the 3299P-1-503?

A: The PV36P503C01B00 maintains all electrical specifications and through-hole PC pin termination. Face dimensions are 0.378" x 0.197" compared to 0.240" x 0.375" for the 3299P-1-503. Mechanical compatibility depends on available board space and hole pattern alignment.

Q: Which substitute part should be selected for RoHS-compliant applications?

A: Both the 3299P-1-503LF and PV36P503C01B00 are ROHS3 compliant. The 3299P-1-503LF is recommended for designs originally specified with the 3299P-1-503 series due to identical footprint and series continuity.

Q: Are all substitute parts available in the same packaging format?

A: All four parts are supplied in tube packaging as specified in the product data.

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