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

Part Overview

The Bourns 3386T-1-503LF is a 50 kOhm, 0.5W through-hole trimmer potentiometer with top adjustment, PC pin termination, and cermet resistive material. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional performance within the allowed parameter tolerances for this trimmer potentiometer category.

Key Parameters

Parameter	Specification
Resistance Value	50 kOhms
Power Rating	0.5W (1/2W)
Tolerance	±10%
Temperature Coefficient	±100ppm/°C
Number of Turns	1
Resistive Material	Cermet
Mounting Type	Through Hole
Termination Style	PC Pins
Adjustment Type	Top Adjustment

Substitute Part Grouping Explanation

Substitute parts for the 3386T-1-503LF are qualified based on the following criteria:

Electrical Parameters (Must Match):

Resistance: 50 kOhms
Power Rating: 0.5W (1/2W)
Tolerance: ±10%
Temperature Coefficient: ±100ppm/°C
Number of Turns: 1
Resistive Material: Cermet

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Termination Style: PC Pins

Functional Parameters (Allowable Variation):

Adjustment Type: Top or Side adjustment
Physical Size: Dimensional variations permitted within standard package families
Packaging Format: Tube or Bulk

Parts are grouped into two categories: direct equivalents with identical adjustment type and size, and functional substitutes with alternative adjustment mechanisms or dimensional profiles that maintain electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Resistance	Power (W)	Tolerance	Temp Coeff	Turns	Material	Adjustment	Size / Dimension	RoHS Status	Inventory
3386T-1-503LF	Bourns Inc.	50 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3	670 Pcs
25PR50KLF	TT Electronics/BI	50 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.270" x 0.270" (6.86mm x 6.86mm)	RoHS	11557 Pcs
72PR50KLF	TT Electronics/BI	50 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Square 0.375" x 0.375" (9.53mm x 9.53mm)	ROHS3	1341 Pcs
82PR50KLF	TT Electronics/BI	50 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Top	Round 0.250" Dia (6.35mm)	ROHS3	1341 Pcs
M63P503KB40	Vishay Spectrol	50 kOhms	0.5	±10%	±100ppm/°C	1	Cermet	Side	Square 0.395" x 0.395" (10.03mm x 10.03mm)	ROHS3	1074 Pcs

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical and Mechanical Specifications):

The 72PR50KLF (TT Electronics/BI) is the primary direct equivalent to the 3386T-1-503LF. Both components share identical electrical parameters, top adjustment mechanism, and matching physical dimensions (0.375" x 0.375" square face). Both are ROHS3 compliant and maintain active product status.

Size-Variant Substitutes (Compact Profile):

The 25PR50KLF (TT Electronics/BI) provides equivalent electrical performance with a reduced footprint (0.270" x 0.270" square face). This substitute is suitable for space-constrained applications where the smaller package profile is acceptable. RoHS compliance is confirmed.

Form-Factor Variant (Circular Profile):

The 82PR50KLF (TT Electronics/BI) maintains all electrical specifications with a circular form factor (0.250" diameter). This substitute accommodates applications requiring round package geometry while preserving electrical and mechanical compatibility.

Adjustment-Type Variant (Side Adjustment):

The M63P503KB40 (Vishay Spectrol) provides equivalent electrical performance with side adjustment instead of top adjustment. This substitute is applicable in applications where side-mounted adjustment access is preferred or required. MSL rating of 1 (Unlimited) is noted.

All substitute parts maintain Active product status and ROHS3 compliance, confirming suitability for current design requirements.

Frequently Asked Questions (FAQ)

Q: Can the 25PR50KLF replace the 3386T-1-503LF in a PCB layout?

A: The 25PR50KLF is electrically equivalent but has a smaller footprint (0.270" x 0.270" versus 0.375" x 0.375"). PCB layout compatibility depends on available space and mounting hole positioning. Verify footprint dimensions against your design before substitution.

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

A: Top adjustment (3386T-1-503LF, 72PR50KLF, 82PR50KLF, 25PR50KLF) allows potentiometer tuning from the component's upper surface. Side adjustment (M63P503KB40) allows tuning from the component's side. Selection depends on PCB layout accessibility and assembly process requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 3386T-1-503LF, 72PR50KLF, 82PR50KLF, and M63P503KB40 are ROHS3 compliant. The 25PR50KLF is RoHS compliant. All parts meet current environmental compliance standards.

Q: Can I use the 82PR50KLF if my PCB layout requires a square footprint?

A: No. The 82PR50KLF has a circular form factor (0.250" diameter), while the 3386T-1-503LF requires a square footprint (0.375" x 0.375"). Use the 72PR50KLF for identical square geometry or the 25PR50KLF for a smaller square alternative.

Q: What is the inventory status for substitute parts?

A: 72PR50KLF: 1341 Pcs; 25PR50KLF: 11557 Pcs; 82PR50KLF: 1341 Pcs; M63P503KB40: 1074 Pcs. The 25PR50KLF offers the highest inventory availability.

Q: Do all parts use the same resistive material?

A: Yes. All listed parts use cermet resistive material, ensuring consistent performance characteristics and temperature stability (±100ppm/°C) across the entire substitute group.

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