78PR50KLF Trimmer Potentiometer Equivalent & Substitute Parts

Part Overview

The 78PR50KLF is a 50 kOhm, 1W through-hole trimmer potentiometer manufactured by TT Electronics/BI. This cermet-based component features side adjustment with 22 turns and PC pin termination, designed for applications requiring precision variable resistance in compact form factors. The part maintains active product status with ROHS3 compliance and is currently in stock with 1100 units available.

Substitute parts become necessary when the original 78PR50KLF is unavailable, when alternative mounting configurations better suit circuit board layouts, or when supply chain optimization requires component standardization across manufacturing batches.

Key Parameters

Parameter	Value
Resistance	50 kOhms
Power Rating	1W
Tolerance	±10%
Temperature Coefficient	±100ppm/°C
Number of Turns	22
Adjustment Type	Side Adjustment
Resistive Material	Cermet
Termination Style	PC Pins
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 78PR50KLF is determined by strict equivalence across the following critical parameters:

Resistance value: 50 kOhms (exact match required)
Power rating: 1W (exact match required)
Tolerance: ±10% (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
Number of turns: 22 (exact match required)
Adjustment type: Side Adjustment (exact match required)
Resistive material: Cermet (exact match required)
Termination style: PC Pins (exact match required)
RoHS compliance: ROHS3 Compliant (exact match required)

The substitute parts identified—3059P-1-503LF and 3059Y-1-503LF from Bourns Inc.—meet all electrical and functional specifications. The primary difference lies in mounting configuration: the 78PR50KLF uses through-hole mounting, while the substitutes employ chassis mount design. Both termination approaches utilize PC pins and maintain identical electrical performance characteristics.

Parameter Comparison

Parameter	78PR50KLF (TT Electronics/BI)	3059P-1-503LF (Bourns Inc.)	3059Y-1-503LF (Bourns Inc.)
Resistance	50 kOhms	50 kOhms	50 kOhms
Power Rating	1W	1W	1W
Tolerance	±10%	±10%	±10%
Temperature Coefficient	±100ppm/°C	±100ppm/°C	±100ppm/°C
Number of Turns	22	22	22
Adjustment Type	Side Adjustment	Side Adjustment	Side Adjustment
Resistive Material	Cermet	Cermet	Cermet
Termination Style	PC Pins	PC Pins	PC Pins
Mounting Type	Through Hole	Chassis Mount	Chassis Mount
Face Dimension	1.250" x 0.195" (31.75mm x 4.95mm)	0.315" x 0.190" (8.00mm x 4.83mm)	0.315" x 0.190" (8.00mm x 4.83mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Packaging	Bulk	Tube	Tube
Current Inventory	1100 Pcs	838 Pcs	1159 Pcs

Engineering Selection Recommendations

Both 3059P-1-503LF and 3059Y-1-503LF qualify as direct electrical equivalents to the 78PR50KLF based on identical resistance, power rating, tolerance, temperature coefficient, turn count, adjustment mechanism, and resistive material composition. All three parts maintain active product status and ROHS3 compliance.

Selection between the 78PR50KLF and its Bourns substitutes depends on circuit board layout requirements. The through-hole mounting of the 78PR50KLF suits applications requiring vertical PCB insertion, while the chassis mount configuration of the 3059 series accommodates panel-mounted or horizontal installation scenarios. The 3059Y-1-503LF offers higher current inventory (1159 units) compared to the 3059P-1-503LF (838 units), which may influence procurement decisions for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can 3059P-1-503LF or 3059Y-1-503LF directly replace 78PR50KLF in existing circuit boards?

A: Electrical substitution is valid. However, mounting configuration differs: the 78PR50KLF uses through-hole termination while the Bourns parts employ chassis mount design. PCB layout modifications may be required to accommodate the different mounting approach.

Q: Are there electrical performance differences between the three parts?

A: No. All three parts share identical electrical specifications: 50 kOhms resistance, 1W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, 22-turn adjustment, side adjustment mechanism, and cermet resistive material.

Q: What is the difference between 3059P-1-503LF and 3059Y-1-503LF?

A: Both parts are electrically and mechanically identical. The designation difference reflects Bourns product line categorization within the Trimpot® 3059 sealed series. Selection between them is based on inventory availability and procurement preferences.

Q: Do all parts meet the same compliance standards?

A: Yes. The 78PR50KLF, 3059P-1-503LF, and 3059Y-1-503LF all maintain ROHS3 compliance and active product status. The Bourns parts are REACH Affected, while the TT Electronics part is REACH Unaffected.

Q: What packaging formats are available?

A: The 78PR50KLF ships in bulk packaging. Both Bourns substitutes (3059P-1-503LF and 3059Y-1-503LF) are supplied in tube packaging, which may affect handling and storage procedures.

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