SM4ETA105 Equivalent & Substitute Parts

Part Overview

The SM4ETA105 is a 1 MOhm, 0.25W surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This cermet-based component features J Lead termination and side adjustment capability with 12 turns of resolution. The part is classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and procurement planning. The SM4ETA105 remains available in inventory (933 pcs) despite its discontinued status.

Substiute Parts

SM4ETA105

Nidec Components CorporationIn Stock: 988SM4ETA105 Datasheet

Current PartRFQ

SM-42TA105

Nidec Components CorporationIn Stock: 1653SM-42TA105 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM4ETA105 is determined by the following critical parameters:

• Resistance value: 1 MOhms (exact match required)
• Power rating: 0.25W minimum (equal or greater acceptable)
• Adjustment type: Side Adjustment (functional requirement)
• Resistive material: Cermet (performance characteristic)
• Mounting type: Surface Mount (assembly compatibility)
• Termination style: J Lead (PCB interface requirement)
• RoHS compliance: ROHS3 Compliant (regulatory requirement)

The SM-42TA105 meets all substitution criteria. Minor variations in turn count (11 vs. 12 turns) and physical dimensions remain within acceptable tolerances for equivalent functional performance in trimmer potentiometer applications.

Parameter Comparison

Engineering Selection Recommendations

The SM-42TA105 is the qualified substitute for the obsolete SM4ETA105. Both components are manufactured by Nidec Components Corporation and share identical electrical specifications: 1 MOhm resistance, 0.25W power rating, ±10% tolerance, and ±100ppm/°C temperature coefficient.

The SM-42TA105 offers the advantage of active product status, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and MSL 1 rating, meeting current regulatory and environmental requirements. The SM-42TA105 provides additional clarity on REACH compliance status (REACH Unaffected), whereas the main part lists vendor undefined status.

Physical dimensions differ marginally (4.80mm x 4.60mm vs. 4.90mm x 4.50mm), remaining compatible with standard surface mount assembly processes. The reduction from 12 to 11 turns represents a minor adjustment resolution difference that does not affect functional equivalence in trimmer potentiometer applications where fine-tuning capability is the primary requirement.

Frequently Asked Questions (FAQ)

Q: Can the SM-42TA105 directly replace the SM4ETA105 in existing designs?

A: Yes. Both components share identical electrical specifications (1 MOhm, 0.25W, ±10% tolerance, ±100ppm/°C), the same resistive material (cermet), identical adjustment type (side adjustment), and compatible termination style (J Lead). Physical dimensions are within acceptable tolerances for surface mount assembly.

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

A: Turn count affects adjustment resolution. The SM4ETA105 provides 12 turns while the SM-42TA105 provides 11 turns. This minor difference does not impact functional equivalence for trimmer potentiometer applications where the primary function is fine-tuning of circuit parameters.

Q: Why is the SM4ETA105 listed as obsolete?

A: The SM4ETA105 has been discontinued by the manufacturer. The SM-42TA105 represents the active product line continuation from Nidec Components Corporation with equivalent electrical and mechanical specifications.

Q: Are there packaging differences between these parts?

A: The main part (SM4ETA105) packaging is listed as standard, while the substitute (SM-42TA105) is supplied in Tape & Reel (TR) format. Both are surface mount components suitable for automated assembly processes.

Q: Do both parts meet current compliance requirements?

A: Yes. Both the SM4ETA105 and SM-42TA105 are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The SM-42TA105 provides explicit REACH Unaffected status, confirming compliance with current environmental regulations.