ST3TA103 Trimmer Potentiometer - Equivalent & Substitute Parts

Part Overview

The ST3TA103 is a 10 kOhms surface mount trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based trimmer features J lead termination, 0.125W power rating, and top adjustment capability with a single turn design. The part is currently obsolete, making identification of active equivalent components essential for ongoing production support, design updates, and inventory management.

Substiute Parts

ST3TA103

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1011ST3TA103 Datasheet

Current PartRFQ

3313J-1-103E

Bourns Inc.In Stock: 202903313J-1-103E Datasheet

MFR RecommendedRFQ

ST-32ETA103

Nidec Components CorporationIn Stock: 18772ST-32ETA103 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST3TA103 is determined by strict equivalence across the following critical parameters:

• Resistance value: 10 kOhms
• Power rating: 0.125W (1/8W)
• Tolerance: ±20%
• Temperature coefficient: ±100ppm/°C
• Number of turns: 1
• Adjustment type: Top Adjustment
• Resistive material: Cermet
• Mounting type: Surface Mount
• Termination style: J Lead
• Moisture sensitivity level: 1 (Unlimited)

Both identified substitute parts meet all these criteria. Physical dimensions show minor variations within acceptable tolerances for the rectangular and square form factors specified. All substitute parts maintain active product status with RoHS3 compliance, providing long-term availability advantages over the obsolete original part.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts provide functional equivalence to the ST3TA103 across all specified electrical and mechanical parameters. The 3313J-1-103E (Bourns Trimpot® 3313 - Sealed) and ST-32ETA103 (Nidec ST-32 series) are active products with ROHS3 compliance, ensuring regulatory alignment and long-term supply chain stability.

Selection between the two substitutes should be based on:

• Packaging format availability (both supplied in Tape & Reel)
• Inventory levels and lead times from your component supplier
• Existing qualification history within your organization
• Physical form factor requirements (rectangular vs. square face)

The Bourns 3313J-1-103E maintains a rectangular face dimension of 0.138" x 0.126" (4.60mm x 3.20mm), matching the original ST3TA103 profile. The Nidec ST-32ETA103 uses a square face dimension of 0.134" x 0.134" (3.40mm x 3.40mm). Both dimensions are compatible with standard surface mount assembly processes and PCB footprints designed for J lead trimmers in this size class.

Frequently Asked Questions (FAQ)

Q: Can the 3313J-1-103E and ST-32ETA103 be used interchangeably with the ST3TA103?

A: Yes. Both parts meet all electrical specifications (10 kOhms, 0.125W, ±20% tolerance, ±100ppm/°C temperature coefficient, 1 turn, top adjustment, cermet material, J lead termination). Physical dimensions differ slightly between rectangular and square form factors, but both are compatible with standard J lead trimmer footprints.

Q: What is the primary reason the ST3TA103 requires substitution?

A: The ST3TA103 is obsolete. Active equivalent parts ensure continued availability for production, repairs, and design updates.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both the 3313J-1-103E and ST-32ETA103 are ROHS3 compliant, whereas the original ST3TA103 is non-compliant.

Q: Do the substitute parts have the same moisture sensitivity rating?

A: Yes. All three parts carry MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Q: What is the difference between the rectangular and square form factors?

A: The 3313J-1-103E has a rectangular face (0.138" x 0.126"), while the ST-32ETA103 has a square face (0.134" x 0.134"). Both fit standard J lead trimmer footprints. Selection depends on PCB layout constraints and available space.

Q: Are there any electrical performance differences between the substitutes?

A: No. All three parts share identical electrical specifications: 10 kOhms resistance, 0.125W power rating, ±20% tolerance, and ±100ppm/°C temperature coefficient.