SM4ETA103 Equivalent & Substitute Parts

Part Overview

The SM4ETA103 is a 10 kOhms, 0.25W surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This component features a cermet resistive element, J lead termination, and side adjustment capability with 12 turns for precise resistance tuning. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing production and maintenance applications. Active equivalent models from the same manufacturer provide functional continuity while maintaining electrical and mechanical compatibility within specified tolerances.

Substiute Parts

SM4ETA103

Nidec Components CorporationIn Stock: 846SM4ETA103 Datasheet

Current PartRFQ

SM-42TA103

Nidec Components CorporationIn Stock: 18459SM-42TA103 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM4ETA103 is determined by strict equivalence across the following critical parameters:

• Resistance value: 10 kOhms (exact match required)
• Power rating: 0.25W, 1/4W (exact match required)
• Tolerance: ±10% (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Adjustment type: Side Adjustment (exact match required)
• Resistive material: Cermet (exact match required)
• Mounting type: Surface Mount (exact match required)
• Termination style: J Lead (exact match required)
• RoHS compliance: ROHS3 Compliant (exact match required)
• Moisture sensitivity level: 1 (Unlimited) (exact match required)

The SM-42TA103 qualifies as a direct substitute based on full alignment with these parameters. Minor variations in number of turns (11 vs. 12) and physical dimensions (4.80mm x 4.60mm vs. 4.90mm x 4.50mm) remain within acceptable mechanical tolerances for surface mount applications. The substitute part is manufactured by the same supplier and maintains identical electrical performance specifications.

Parameter Comparison

Engineering Selection Recommendations

The SM-42TA103 is the qualified substitute for the obsolete SM4ETA103 based on the following engineering criteria:

Electrical equivalence is complete across all specified parameters: resistance, power rating, tolerance, and temperature coefficient are identical. Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility.

The SM-42TA103 is currently in active production status with substantial inventory availability (18,396 pcs), whereas the SM4ETA103 is obsolete. This transition ensures long-term supply chain continuity and component availability for new production runs and field replacements.

Physical dimensions show minor variation (0.10mm to 0.20mm difference in length and width), which remains within standard PCB layout tolerances for surface mount applications. The reduction in turns from 12 to 11 does not affect electrical performance, as both components deliver identical resistance and tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can SM-42TA103 be used as a direct replacement for SM4ETA103 in existing designs?

A: Yes. The SM-42TA103 meets all critical electrical specifications (10 kOhms, 0.25W, ±10% tolerance, ±100ppm/°C) and maintains identical mounting characteristics (surface mount, J lead, side adjustment). Minor dimensional differences (approximately 0.1-0.2mm) are within standard PCB layout tolerances.

Q: What is the significance of the difference in number of turns (12 vs. 11)?

A: The number of turns affects adjustment resolution but does not alter the final resistance value or electrical performance. Both components deliver 10 kOhms with ±10% tolerance. The 11-turn configuration in the substitute provides slightly coarser adjustment increments, which is acceptable for applications where the original 12-turn specification was not critical to circuit function.

Q: Are there compliance differences between the two parts?

A: No. Both SM4ETA103 and SM-42TA103 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Regulatory and environmental requirements are identical.

Q: Why is SM4ETA103 listed as obsolete?

A: The SM4ETA103 has been discontinued by the manufacturer. The SM-42TA103 from the same SM series represents the active production equivalent, ensuring continued availability and supply chain support.

Q: Are there packaging differences?

A: The SM4ETA103 packaging information is not specified in available data. The SM-42TA103 is supplied in Tape & Reel (TR) format, which is standard for surface mount component distribution and automated assembly processes.