SMUB503PET Equivalent & Substitute Parts

Part Overview

The SMUB503PET is a 50 kOhm, 0.25W surface mount trimmer potentiometer manufactured by Ohmite in the SMU series. This component features a cermet resistive element with gull wing termination and top adjustment capability. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Key Parameters

Parameter	Value
Resistance	50 kOhms
Power Rating	0.25W (1/4W)
Tolerance	±20%
Temperature Coefficient	±100ppm/°C
Number of Turns	1
Adjustment Type	Top Adjustment
Resistive Material	Cermet
Mounting Type	Surface Mount
Termination Style	Gull Wing
Size/Dimension	Rectangular - 0.197" x 0.177" Face (5.00mm x 4.50mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMUB503PET is determined by strict equivalence across the following parameters:

Resistance value: 50 kOhms
Power rating: 0.25W (1/4W)
Tolerance: ±20%
Temperature coefficient: ±100ppm/°C
Number of turns: 1
Adjustment type: Top Adjustment
Resistive material: Cermet
Mounting type: Surface Mount
Termination style: Gull Wing
Physical dimensions: Rectangular - 0.197" x 0.177" Face (5.00mm x 4.50mm)
RoHS compliance: ROHS3 Compliant
Moisture sensitivity level: 1 (Unlimited)

The ST-4ETB503 manufactured by Nidec Components Corporation meets all specified parameters and qualifies as a direct functional equivalent.

Parameter Comparison

Parameter	SMUB503PET (Ohmite)	ST-4ETB503 (Nidec)
Resistance	50 kOhms	50 kOhms
Power Rating	0.25W (1/4W)	0.25W (1/4W)
Tolerance	±20%	±20%
Temperature Coefficient	±100ppm/°C	±100ppm/°C
Number of Turns	1	1
Adjustment Type	Top Adjustment	Top Adjustment
Resistive Material	Cermet	Cermet
Mounting Type	Surface Mount	Surface Mount
Termination Style	Gull Wing	Gull Wing
Size/Dimension	Rectangular - 0.197" x 0.177" Face (5.00mm x 4.50mm)	Rectangular - 0.197" x 0.177" Face (5.00mm x 4.50mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ST-4ETB503 is the qualified substitute for the SMUB503PET. Both components are ROHS3 compliant and carry identical electrical and mechanical specifications. The primary distinction is product status: the SMUB503PET is obsolete while the ST-4ETB503 remains in active production. The ST-4ETB503 is available in Tape & Reel packaging with confirmed inventory of 2000 units.

Selection of the ST-4ETB503 is appropriate for new designs and ongoing production support where the SMUB503PET is no longer available. Both components satisfy identical functional requirements within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can the ST-4ETB503 be used as a direct replacement for the SMUB503PET?

A: Yes. The ST-4ETB503 meets all electrical and mechanical specifications of the SMUB503PET, including resistance value, power rating, tolerance, temperature coefficient, adjustment type, resistive material, mounting configuration, termination style, and physical dimensions.

Q: What is the primary reason for substitution?

A: The SMUB503PET is classified as obsolete. The ST-4ETB503 is an active product offering equivalent functionality and specifications.

Q: Are there packaging differences between these parts?

A: The SMUB503PET packaging information is not specified in the reference data. The ST-4ETB503 is supplied in Tape & Reel (TR) packaging.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SMUB503PET and ST-4ETB503 are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Are the physical dimensions identical?

A: Yes. Both components have identical rectangular dimensions of 0.197" x 0.177" face (5.00mm x 4.50mm).

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