Equivalent & Substitute Parts for 3386M-1-503LF

Part Overview

The 3386M-1-503LF is a 50 kOhm, 0.5W through-hole trimmer potentiometer manufactured by Bourns Inc. as part of the Trimpot® 3386 sealed series. This component features cermet resistive material, top adjustment, and PC pin termination in a square 0.375" x 0.375" form factor. The part is active and in production, with RoHS3 compliance and REACH unaffected status. Equivalent and substitute parts are identified based on matching electrical specifications and compatible mechanical characteristics for direct circuit board replacement applications.

Substiute Parts

3386M-1-503LF

Bourns Inc.In Stock: 11563386M-1-503LF Datasheet

Current PartRFQ

25PR50KLF

TT Electronics/BIIn Stock: 1166425PR50KLF Datasheet

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72PR50KLF

TT Electronics/BIIn Stock: 140172PR50KLF Datasheet

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82PR50KLF

TT Electronics/BIIn Stock: 110082PR50KLF Datasheet

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M63P503KB40

Vishay SpectrolIn Stock: 1143M63P503KB40 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3386M-1-503LF is determined by the following critical parameters: resistance value (50 kOhms), power rating (0.5W), tolerance (±10%), temperature coefficient (±100ppm/°C), number of turns (1), resistive material (cermet), mounting type (through hole), and termination style (PC pins). Parts meeting all these electrical specifications are considered functionally equivalent. Mechanical form factor variations (size and adjustment type) are secondary considerations that may affect board layout compatibility but do not prevent electrical substitution when space permits.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the core electrical requirements for the 3386M-1-503LF and maintain active production status with full regulatory compliance. Selection among equivalents should prioritize form factor compatibility with the target circuit board layout.

The 72PR50KLF (TT Electronics/BI) provides the closest mechanical match, sharing identical square 0.375" x 0.375" dimensions and top adjustment configuration. This part is ROHS3 compliant and available in bulk packaging.

The 25PR50KLF (TT Electronics/BI) offers a compact alternative with reduced footprint (0.270" x 0.270" square), suitable for space-constrained applications. This part maintains top adjustment and is RoHS compliant.

The 82PR50KLF (TT Electronics/BI) provides a round form factor (0.250" diameter) with top adjustment, offering a different mechanical profile while maintaining all electrical specifications. ROHS3 compliance is confirmed.

The M63P503KB40 (Vishay Spectrol) features a slightly larger square footprint (0.395" x 0.395") with side adjustment instead of top adjustment. This configuration may require board layout modification but is ROHS3 compliant and available.

Frequently Asked Questions (FAQ)

Q: Can 25PR50KLF replace 3386M-1-503LF directly on the circuit board?

A: The 25PR50KLF is electrically equivalent but has a smaller footprint (0.270" x 0.270" versus 0.375" x 0.375"). Direct replacement is possible if the mounting holes align or can be modified. Verify hole spacing and clearance before installation.

Q: What is the difference between top adjustment and side adjustment trimmers?

A: Top adjustment (3386M-1-503LF, 25PR50KLF, 72PR50KLF, 82PR50KLF) allows potentiometer tuning from above the circuit board. Side adjustment (M63P503KB40) requires access from the side. Selection depends on board layout and accessibility requirements during calibration.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 3386M-1-503LF, 72PR50KLF, 82PR50KLF, and M63P503KB40 are ROHS3 compliant. The 25PR50KLF is RoHS compliant. All parts are REACH unaffected.

Q: Does packaging type affect electrical performance?

A: No. Packaging (tube or bulk) does not affect electrical specifications or performance. Selection is based on procurement and inventory requirements.

Q: Can I use 82PR50KLF in place of 3386M-1-503LF if space is limited?

A: Yes, electrically. The 82PR50KLF has a smaller round footprint (0.250" diameter) compared to the square 0.375" x 0.375" form factor of the 3386M-1-503LF. Verify that the circular mounting pattern is compatible with your circuit board design.

Q: What is the significance of the temperature coefficient ±100ppm/°C?

A: This specification indicates the resistance value change per degree Celsius. All listed parts share this specification, ensuring consistent thermal performance across the operating temperature range.