Bourns 3329H-DK9-503 Trimmer Potentiometer: Equivalent & Substitute Parts

Part Overview

The Bourns 3329H-DK9-503 is a 50 kOhm, 0.5W through-hole trimmer potentiometer with PC pin termination and top adjustment. This sealed Trimpot® 3329 series component is designed for applications requiring precision resistance adjustment in compact form factors. The part is currently active in production. Substitute parts may be required due to inventory availability, packaging preferences, compliance requirements, or specific mechanical constraints in board layout.

Substiute Parts

3329H-DK9-503

Bourns Inc.In Stock: 7833329H-DK9-503 Datasheet

Current PartRFQ

25PR50KLF

TT Electronics/BIIn Stock: 1166425PR50KLF Datasheet

SimilarRFQ

82PR50KLF

TT Electronics/BIIn Stock: 110082PR50KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3329H-DK9-503 are qualified based on the following electrical and mechanical parameters:

Electrical Equivalence Requirements:

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

Mechanical Compatibility Requirements:

• Mounting type: Through Hole
• Termination style: PC Pins
• Functional form factor: Round or square body configurations acceptable

The substitute parts TT Electronics/BI 25PR50KLF and 82PR50KLF meet all electrical specifications and mounting requirements. Dimensional variations (square vs. round body) are acceptable provided PCB layout accommodates the specific footprint.

Parameter Comparison

Engineering Selection Recommendations

3329H-DK9-503 (Bourns): Select this part when the original design specification requires the Trimpot® 3329 series form factor or when REACH-affected status is acceptable for the application. Current inventory: 769 pcs.

25PR50KLF (TT Electronics/BI): This substitute offers RoHS compliance and REACH unaffected status. The square body configuration (0.270" x 0.270") requires verification of PCB layout compatibility. Tube packaging is suitable for standard production workflows. Current inventory: 11,557 pcs.

82PR50KLF (TT Electronics/BI): This substitute provides ROHS3 compliance and REACH unaffected status with a round body matching the original 0.250" diameter. Bulk packaging may be preferred for high-volume applications. Current inventory: 1,017 pcs.

Frequently Asked Questions (FAQ)

Q: Can 25PR50KLF be used as a direct replacement for 3329H-DK9-503?

A: Yes, electrically and functionally. The 25PR50KLF meets all electrical specifications (50 kOhms, 0.5W, ±10% tolerance, ±100ppm/°C, 1-turn, top adjustment, cermet, through-hole PC pins). The square body (0.270" x 0.270") differs from the round body (0.250" diameter) of the 3329H-DK9-503. PCB layout must accommodate the larger square footprint.

Q: Can 82PR50KLF be used as a direct replacement for 3329H-DK9-503?

A: Yes, electrically and functionally. The 82PR50KLF meets all electrical specifications and shares the same round body diameter (0.250") as the original part. Bulk packaging differs from tube packaging of the original.

Q: What is the difference between RoHS compliant and RoHS non-compliant status?

A: RoHS compliance indicates the part does not contain restricted hazardous substances (lead, cadmium, mercury, hexavalent chromium, PBBs, PBDEs) above specified thresholds. The 3329H-DK9-503 is RoHS non-compliant; both substitute parts (25PR50KLF and 82PR50KLF) are RoHS compliant or ROHS3 compliant. Application requirements determine whether compliance is mandatory.

Q: What does REACH Affected vs. REACH Unaffected mean?

A: REACH Affected indicates the part may contain substances of very high concern (SVHC) requiring declaration. REACH Unaffected indicates no SVHC substances are present. The 3329H-DK9-503 is REACH Affected; both substitutes are REACH Unaffected. Regulatory requirements determine whether REACH status is a selection criterion.

Q: Are there dimensional constraints when selecting between round and square body trimmers?

A: Yes. The 3329H-DK9-503 and 82PR50KLF have round bodies (0.250" diameter). The 25PR50KLF has a square body (0.270" x 0.270" face). PCB layout, mounting hole patterns, and adjacent component placement must accommodate the selected body geometry.

Q: Do all three parts have identical electrical performance?

A: Yes. All three parts share identical electrical specifications: 50 kOhms resistance, 0.5W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 1-turn adjustment, top adjustment type, cermet resistive material, and PC pin termination. Differences are limited to body shape, packaging format, and compliance certifications.