Bourns 3329P-1-503 50kΩ Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The Bourns 3329P-1-503 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. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional performance within the allowed parameter tolerances for this product category.

Substiute Parts

3329P-1-503

Bourns Inc.In Stock: 10423329P-1-503 Datasheet

Current PartRFQ

3329P-1-503LF

Bourns Inc.In Stock: 13253329P-1-503LF Datasheet

DirectRFQ

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-1-503 are classified based on electrical and mechanical parameter alignment:

Direct Equivalent (Identical Electrical & Mechanical Parameters):

• 3329P-1-503LF: Same manufacturer (Bourns Inc.), same series (Trimpot® 3329), identical electrical specifications, identical physical dimensions, and identical termination style. The primary difference is RoHS compliance status (ROHS3 Compliant vs. RoHS non-compliant).

Functional Equivalents (Matching Electrical Parameters with Minor Mechanical Variations):

• 25PR50KLF (TT Electronics/BI): Matches all electrical specifications (50kΩ, 0.5W, ±10% tolerance, ±100ppm/°C, 1 turn, top adjustment, cermet, through-hole, PC pins). Physical form factor differs (square 0.270" x 0.270" face vs. round 0.250" dia), requiring PCB layout verification.
• 82PR50KLF (TT Electronics/BI): Matches all electrical specifications identically to the main part. Physical dimensions are identical (round 0.250" dia). Packaging differs (bulk vs. tube). RoHS3 compliant.

Substitution eligibility is determined by: resistance value, power rating, tolerance, temperature coefficient, number of turns, adjustment type, resistive material, mounting type, and termination style. Physical dimensions and packaging are secondary considerations that may require design review.

Parameter Comparison

Engineering Selection Recommendations

3329P-1-503LF (Bourns Inc.): This is the direct equivalent with identical electrical and mechanical specifications. Selection of this part is appropriate when RoHS3 compliance is required or preferred. Both parts are active products from the same manufacturer and series.

82PR50KLF (TT Electronics/BI): This part provides identical electrical performance and physical dimensions to the main part. It offers RoHS3 compliance and REACH unaffected status. Bulk packaging may be advantageous for high-volume applications. This part is suitable for direct substitution without PCB layout modifications.

25PR50KLF (TT Electronics/BI): This part matches all electrical specifications but features a square form factor (0.270" x 0.270" face) compared to the round 0.250" diameter of the main part. PCB footprint and mounting hole spacing must be verified for compatibility. This part is suitable only if mechanical form factor differences are accommodated in the design.

Selection should prioritize parts with active product status and compliance certifications matching application requirements.

Frequently Asked Questions (FAQ)

Q: Can 3329P-1-503LF be used as a direct replacement for 3329P-1-503?

A: Yes. Both parts are from Bourns Inc., Trimpot® 3329 series, with identical electrical specifications (50kΩ, 0.5W, ±10% tolerance, ±100ppm/°C, 1 turn, top adjustment, cermet, through-hole, PC pins) and identical physical dimensions (round 0.250" dia). The primary difference is RoHS compliance status. No design modifications are required.

Q: What are the key electrical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: resistance value (50 kOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1), adjustment type (top adjustment), resistive material (cermet), mounting type (through-hole), and termination style (PC pins). All substitute parts listed match these parameters.

Q: Can 25PR50KLF be used instead of 3329P-1-503?

A: 25PR50KLF matches all electrical specifications and functional performance. However, it has a different physical form factor (square 0.270" x 0.270" face vs. round 0.250" dia). PCB layout, mounting hole spacing, and available board space must be verified before substitution.

Q: What is the difference between tube and bulk packaging?

A: Tube packaging (3329P-1-503, 3329P-1-503LF, 25PR50KLF) provides organized component presentation suitable for automated assembly and smaller order quantities. Bulk packaging (82PR50KLF) is typically used for high-volume applications. Electrical and mechanical specifications are identical regardless of packaging type.

Q: Are all substitute parts currently in production?

A: Yes. All listed parts (3329P-1-503LF, 25PR50KLF, 82PR50KLF) have active product status and are in current production.

Q: What compliance differences exist between the main part and substitutes?

A: The main part (3329P-1-503) is RoHS non-compliant and REACH affected. 3329P-1-503LF is ROHS3 compliant and REACH affected. 25PR50KLF is RoHS compliant and REACH unaffected. 82PR50KLF is ROHS3 compliant and REACH unaffected. Application regulatory requirements should guide part selection.