Bourns 3266Z-1-503 Trimmer Potentiometer - Equivalent & Substitute Parts

Part Overview

The Bourns 3266Z-1-503 is a 50 kOhms, 0.25W through-hole trimmer potentiometer with PC pin termination and side adjustment capability. This sealed Trimpot® 3266 series component is designed for precision applications requiring multi-turn adjustment in compact rectangular form factors. The part is currently active in production with 709 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and functional characteristics align within acceptable tolerances for direct circuit board replacement.

Substiute Parts

3266Z-1-503

Bourns Inc.In Stock: 7333266Z-1-503 Datasheet

Current PartRFQ

64XR50KLF

TT Electronics/BIIn Stock: 218064XR50KLF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3266Z-1-503 are qualified based on the following critical parameters:

• Resistance value: 50 kOhms (exact match required)
• Power rating: 0.25W minimum (1/4W)
• Tolerance: ±10% or better
• Temperature coefficient: ±100ppm/°C or better
• Number of turns: 12 (multi-turn adjustment requirement)
• Adjustment type: Side adjustment (functional requirement)
• Resistive material: Cermet (performance and stability requirement)
• Mounting type: Through hole (PCB integration requirement)
• Termination style: PC pins (soldering requirement)
• Face dimensions: Rectangular form factor within 0.250" x 0.170" specification

The TT Electronics/BI 64XR50KLF meets all electrical and mechanical substitution criteria with minor dimensional variation (0.165" vs 0.170" height) that remains within acceptable PCB layout tolerances.

Parameter Comparison

Engineering Selection Recommendations

The TT Electronics/BI 64XR50KLF qualifies as a direct electrical and mechanical substitute for the Bourns 3266Z-1-503 based on identical core specifications across resistance, power rating, tolerance, temperature coefficient, turn count, adjustment mechanism, and termination style.

The 64XR50KLF offers additional compliance advantages: RoHS compliance status and MSL rating of 1 (unlimited moisture sensitivity level), compared to the 3266Z-1-503 which is RoHS non-compliant and has no MSL specification. These compliance differences may be relevant for applications subject to environmental or regulatory requirements.

The dimensional difference of 0.005" (0.127mm) in the height dimension (0.170" vs 0.165") is within standard PCB layout tolerances and does not affect electrical performance or functional compatibility.

Both parts share identical ECCN classification (EAR99) and are suitable for equivalent circuit applications without functional modification.

Frequently Asked Questions (FAQ)

Q: Can the TT Electronics/BI 64XR50KLF replace the Bourns 3266Z-1-503 in existing designs?

A: Yes. All electrical parameters (resistance, power rating, tolerance, temperature coefficient, turn count) and mechanical specifications (through-hole mounting, PC pin termination, side adjustment) are identical. The 0.005" height difference is within standard PCB layout tolerances.

Q: What is the significance of the RoHS compliance difference?

A: The 64XR50KLF is RoHS compliant while the 3266Z-1-503 is not. If your application or end market requires RoHS compliance, the 64XR50KLF is the appropriate selection. If RoHS compliance is not a requirement, both parts are functionally equivalent.

Q: Does the MSL rating difference affect substitution?

A: The 64XR50KLF has an MSL rating of 1 (unlimited), while the 3266Z-1-503 has no MSL specification. MSL ratings are relevant for moisture-sensitive storage and handling. The 64XR50KLF's MSL 1 rating indicates no moisture sensitivity restrictions, which may be advantageous for supply chain and storage flexibility.

Q: Are the PC pin terminations compatible between these parts?

A: Yes. Both parts use identical PC pin termination style and are designed for through-hole soldering on standard PCBs. No PCB redesign is required.

Q: What is the practical impact of the 0.005" dimensional difference?

A: The height difference (0.170" vs 0.165") is negligible for standard PCB applications. Both parts fit within the same rectangular footprint envelope and do not affect component placement, clearance, or thermal management in typical circuit designs.