SMUB103PET Surface Mount Trimmer Potentiometer - Equivalent & Substitute Parts

Part Overview

The SMUB103PET is a 10 kOhms, 0.25W surface mount trimmer potentiometer manufactured by Ohmite with gull wing termination and top adjustment capability. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing production support, design updates, and inventory management. Active alternatives from current manufacturers provide functional equivalence while maintaining design compatibility.

Substiute Parts

SMUB103PET

OhmiteIn Stock: 903SMUB103PET Datasheet

Current PartRFQ

ST-4ETB103

Nidec Components CorporationIn Stock: 44004ST-4ETB103 Datasheet

MFR RecommendedRFQ

TS53YL103MR10

Vishay SferniceIn Stock: 1537TS53YL103MR10 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMUB103PET are qualified based on strict electrical and mechanical parameter matching:

Electrical Parameters (Must Match):

• Resistance value: 10 kOhms
• Power rating: 0.25W (1/4W)
• Tolerance: ±20%
• Temperature coefficient: ±100ppm/°C
• Number of turns: 1

Mechanical Parameters (Must Match):

• Adjustment type: Top Adjustment
• Resistive material: Cermet
• Mounting type: Surface Mount
• Termination style: Gull Wing
• RoHS compliance: ROHS3 Compliant

Both identified substitutes meet all critical parameters. Physical dimensions show minor variations within acceptable tolerance for PCB layout compatibility.

Parameter Comparison

Engineering Selection Recommendations

ST-4ETB103 (Nidec Components Corporation) is the primary substitute. This part maintains identical electrical specifications and mechanical form factor to the SMUB103PET. Active product status ensures long-term availability and supply chain continuity. MSL rating of 1 matches the original component, eliminating moisture sensitivity considerations during storage and handling.

TS53YL103MR10 (Vishay Sfernice) is a secondary substitute. All electrical parameters and core mechanical specifications are equivalent. The face dimension differs slightly (square 5.00mm x 5.00mm versus rectangular 5.00mm x 4.50mm), requiring PCB layout verification for clearance compatibility. MSL rating of 4 requires controlled storage conditions (72-hour maximum exposure to ambient conditions above 30°C and 60% relative humidity) prior to soldering.

Both substitutes carry ROHS3 compliance and active product status, supporting regulatory requirements and supply availability.

Frequently Asked Questions (FAQ)

Q: Can ST-4ETB103 be used as a direct replacement for SMUB103PET? A: Yes. ST-4ETB103 matches all electrical parameters (10 kOhms, 0.25W, ±20% tolerance, ±100ppm/°C) and mechanical specifications (top adjustment, cermet material, gull wing termination, surface mount). Identical face dimensions (5.00mm x 4.50mm) ensure PCB compatibility without layout modification.

Q: What is the key difference between the two substitutes? A: ST-4ETB103 and TS53YL103MR10 differ in face dimension and moisture sensitivity level. ST-4ETB103 maintains the rectangular 5.00mm x 4.50mm form factor with MSL 1. TS53YL103MR10 has a square 5.00mm x 5.00mm face with MSL 4, requiring verification of PCB clearance and implementation of moisture control procedures.

Q: Does the square face dimension of TS53YL103MR10 affect electrical performance? A: No. Face dimension is a mechanical characteristic only. Electrical performance is determined by resistance value, power rating, tolerance, temperature coefficient, and resistive material—all of which are identical across both substitutes.

Q: What does MSL 4 mean for TS53YL103MR10? A: MSL 4 indicates a 72-hour maximum exposure limit to ambient conditions above 30°C and 60% relative humidity prior to soldering. Components must be stored in controlled conditions and baked if exposure limits are exceeded. MSL 1 (ST-4ETB103) has no such restriction.

Q: Are both substitutes RoHS compliant? A: Yes. Both ST-4ETB103 and TS53YL103MR10 are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original SMUB103PET.

Q: Which substitute should be selected for new designs? A: ST-4ETB103 is recommended for new designs due to identical form factor, MSL 1 rating, and active product status. TS53YL103MR10 is suitable when ST-4ETB103 is unavailable, provided PCB layout accommodates the square face dimension and moisture control procedures are implemented.