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

Part Overview

The Bourns 3329P-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 precision circuit tuning applications requiring cermet resistive elements and single-turn adjustment capability. 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

3329P-DK9-503

Bourns Inc.In Stock: 11723329P-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 3329P-DK9-503 are qualified based on electrical and mechanical parameter equivalence. The following criteria determine substitutability:

Electrical Parameters (Must Match):

• 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 Parameters (Must Match):

• Mounting type: Through Hole
• Termination style: PC Pins

Allowable Variations:

• Physical size/dimension (Round vs. Square body)
• Packaging format (Tube, Bulk)
• RoHS and REACH compliance status
• Manufacturer and series designation

The substitute parts 25PR50KLF and 82PR50KLF meet all electrical and core mechanical requirements while differing in physical form factor and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—3329P-DK9-503, 25PR50KLF, and 82PR50KLF—are electrically and functionally equivalent for 50 kOhm, 0.5W trimmer potentiometer applications with cermet elements and single-turn top adjustment.

3329P-DK9-503 (Bourns Trimpot® 3329): Select when the sealed Trimpot® 3329 series is specified or when RoHS/REACH compliance status is not a constraint. Round body form factor (0.250" diameter) provides compact footprint.

25PR50KLF (TT Electronics/BI Series 25): Select when RoHS compliance is required. Square body form factor (0.270" x 0.270") requires verification of available board space. Tube packaging supports automated assembly processes.

82PR50KLF (TT Electronics/BI Series 82): Select when ROHS3 compliance is required. Round body form factor (0.250" diameter) matches the original part's mechanical envelope. Bulk packaging is suitable for manual assembly or reel-fed processes.

Physical dimensions must be verified against PCB layout constraints, particularly when substituting the square 25PR50KLF for the round 3329P-DK9-503 or 82PR50KLF.

Frequently Asked Questions (FAQ)

Q: Can 25PR50KLF be used as a direct replacement for 3329P-DK9-503 on the same PCB?

A: Electrical substitution is valid. However, the 25PR50KLF has a square body (0.270" x 0.270") versus the round body (0.250" diameter) of the 3329P-DK9-503. PCB layout and mechanical clearance must be verified before substitution.

Q: What is the difference between 82PR50KLF and 3329P-DK9-503?

A: Both parts are electrically identical with matching round body dimensions (0.250" diameter). The primary differences are manufacturer (TT Electronics/BI vs. Bourns), series designation (82 vs. 3329), and compliance status (ROHS3 Compliant vs. RoHS non-compliant). Functional performance is equivalent.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental restrictions, not electrical characteristics. All three parts deliver identical electrical performance: 50 kOhms, 0.5W, ±10% tolerance, ±100ppm/°C temperature coefficient.

Q: Which substitute part should be selected for new designs?

A: Selection depends on compliance requirements and packaging preferences. For RoHS-compliant designs, use 25PR50KLF or 82PR50KLF. For mechanical compatibility with existing layouts using round bodies, 82PR50KLF matches the 3329P-DK9-503 envelope.

Q: Are there inventory or lead-time considerations?

A: Inventory levels are provided in the part specifications. 25PR50KLF has the highest stock (11,557 pcs), followed by 3329P-DK9-503 (1,079 pcs) and 82PR50KLF (1,017 pcs). Availability should be confirmed with the supplier for current lead times.

Q: Can these parts be used interchangeably in production?

A: Yes, provided that PCB layout accommodates the physical dimensions of the selected part. Round-body parts (3329P-DK9-503 and 82PR50KLF) are mechanically interchangeable. The square-body 25PR50KLF requires layout verification.