72PR20KLF Trimmer Potentiometer - Equivalent & Substitute Parts

Part Overview

The 72PR20KLF is a 20 kOhm, 0.5W through-hole trimmer potentiometer manufactured by TT Electronics/BI. This cermet-based component features top adjustment via PC pins and is rated for 1 turn operation with ±10% tolerance and ±100ppm/°C temperature coefficient. The part is Active status and ROHS3 compliant. Substitute parts are necessary when the primary part is unavailable, when alternative adjustment types are required for specific PCB layouts, or when alternative packaging formats better suit procurement or assembly requirements.

Key Parameters

Parameter	Value
Resistance	20 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
Size	Square - 0.375" x 0.375" (9.53mm x 9.53mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic is based on matching the following critical parameters: resistance value (20 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).

Substitute parts are grouped into two categories:

Category 1: Top Adjustment, Identical Footprint (9.53mm x 9.53mm) These parts maintain the same adjustment type and physical dimensions as the 72PR20KLF, ensuring direct mechanical and electrical compatibility without PCB layout modifications.

Category 2: Side Adjustment, Slightly Larger Footprint (10.03mm x 10.03mm) These parts feature side adjustment instead of top adjustment and have marginally larger dimensions. They are electrically equivalent but require verification of available PCB space before substitution.

Parameter Comparison

Part Number	Manufacturer	Resistance	Power	Tolerance	Temp Coeff	Turns	Material	Adjustment	Size (Face)	RoHS Status	Inventory
72PR20KLF	TT Electronics/BI	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	641 Pcs
3386F-1-203LF	Bourns Inc.	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	953 Pcs
3386G-1-203LF	Bourns Inc.	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	1249 Pcs
3386P-1-203LF	Bourns Inc.	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	40200 Pcs
3386P-EY5-203LF	Bourns Inc.	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	1876 Pcs
3386R-1-203LF	Bourns Inc.	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	1059 Pcs
3386Y-1-203LF	Bourns Inc.	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Top	9.53mm x 9.53mm	ROHS3	727 Pcs
M63P203KB40	Vishay Spectrol	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Side	10.03mm x 10.03mm	ROHS3	917 Pcs
M63M203KB40	Vishay Spectrol	20 kOhms	0.5W	±10%	±100ppm/°C	1	Cermet	Side	10.03mm x 10.03mm	ROHS3	1168 Pcs

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement - Top Adjustment, 9.53mm x 9.53mm)

The Bourns Trimpot® 3386 series parts (3386F-1-203LF, 3386G-1-203LF, 3386P-1-203LF, 3386P-EY5-203LF, 3386R-1-203LF, 3386Y-1-203LF) are electrically and mechanically equivalent to the 72PR20KLF. All are ROHS3 compliant with Active product status. The 3386P-1-203LF offers the highest inventory availability (40200 Pcs), making it the preferred choice for high-volume applications. The 3386G-1-203LF and 3386P-EY5-203LF provide secondary options with substantial stock levels.

Alternative Substitutes (Side Adjustment, 10.03mm x 10.03mm)

The Vishay Spectrol M63P203KB40 and M63M203KB40 are electrically equivalent but feature side adjustment instead of top adjustment. These parts require PCB layout verification to confirm adequate clearance for the slightly larger 10.03mm x 10.03mm footprint. Both are ROHS3 compliant with Active product status. The M63M203KB40 provides higher inventory (1168 Pcs) compared to M63P203KB40 (917 Pcs).

Frequently Asked Questions (FAQ)

Q: Can I substitute a top-adjustment trimmer with a side-adjustment trimmer?

A: Yes, electrically they are equivalent. However, side-adjustment parts require different PCB layout considerations. Verify that your PCB design accommodates the adjustment screw access from the side and that the slightly larger footprint (10.03mm vs 9.53mm) does not conflict with adjacent components.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements, matching the 72PR20KLF specification.

Q: What is the difference between the various Bourns 3386 series variants (F, G, P, R, Y)?

A: The provided data specifies only the part numbers and does not differentiate the functional characteristics between these variants. All listed variants share identical electrical parameters (20 kOhms, 0.5W, ±10%, ±100ppm/°C, 1 turn, top adjustment, 9.53mm x 9.53mm). Selection should be based on inventory availability and packaging format (all listed variants are supplied in Tube packaging).

Q: Which substitute offers the best availability?

A: The 3386P-1-203LF provides the highest inventory level at 40200 Pcs, followed by 3386P-EY5-203LF at 1876 Pcs.

Q: Can I use these substitutes in high-temperature applications?

A: All parts share the same temperature coefficient (±100ppm/°C). Verify that your specific application temperature range is within the rated operating limits of the selected part by consulting the manufacturer's datasheet.

Q: Are there packaging differences between substitutes?

A: Yes. The 72PR20KLF is supplied in Bulk packaging. Most Bourns 3386 series substitutes are supplied in Tube packaging. The Vishay Spectrol M63M203KB40 is supplied in Box packaging, while M63P203KB40 is supplied in Bulk packaging. Confirm packaging compatibility with your procurement and assembly processes.

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