SM4ETA102 Equivalent & Substitute Parts

Part Overview

The SM4ETA102 is a 1 kOhms, 0.25W surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This cermet-based component features J Lead termination with 12-turn side adjustment capability and is housed in a rectangular package measuring 4.90mm x 4.50mm. The part is currently classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and component procurement.

Substiute Parts

SM4ETA102

Nidec Components CorporationIn Stock: 800SM4ETA102 Datasheet

Current PartRFQ

SM-42TA102

Nidec Components CorporationIn Stock: 7479SM-42TA102 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM4ETA102 is determined by strict equivalence across the following critical parameters:

• Resistance value: 1 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)
• MSL rating: 1 (Unlimited) (exact match required)

The SM-42TA102 meets all substitution criteria. Minor variations in number of turns (11 vs. 12) and package 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 specifications.

Parameter Comparison

Engineering Selection Recommendations

The SM-42TA102 is the direct substitute for the obsolete SM4ETA102. Both components are manufactured by Nidec Components Corporation and maintain identical electrical and mechanical specifications across all critical parameters. The substitute part carries Active product status, ensuring long-term availability and supply chain continuity.

Both parts satisfy ROHS3 compliance requirements and carry MSL 1 ratings, indicating compatibility with standard surface mount assembly processes. The SM-42TA102 is available in Tape & Reel packaging, which is standard for high-volume production environments, whereas the original SM4ETA102 was supplied in bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can the SM-42TA102 be used as a direct replacement for the SM4ETA102?

A: Yes. Both parts share identical electrical specifications (1 kOhms, 0.25W, ±10% tolerance, ±100ppm/°C temperature coefficient) and mechanical characteristics (surface mount, J Lead termination, side adjustment, cermet resistive material). The minor difference in turn count (11 vs. 12) and package dimensions (4.80mm x 4.60mm vs. 4.90mm x 4.50mm) does not affect functional equivalence.

Q: What is the primary reason for substitution?

A: The SM4ETA102 is classified as obsolete. The SM-42TA102 is an active product from the same manufacturer, providing assured supply and continued technical support.

Q: Are there packaging differences between these parts?

A: Yes. The SM4ETA102 was supplied in bulk packaging, while the SM-42TA102 is available in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated surface mount assembly processes.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant and carry MSL 1 ratings. The SM-42TA102 has confirmed REACH Unaffected status, while the original part's REACH status was vendor undefined.

Q: Are there any turn count considerations for circuit design?

A: The SM-42TA102 has 11 turns compared to the SM4ETA102's 12 turns. This represents a 8.3% reduction in adjustment resolution. For applications requiring precise potentiometer tuning, this difference should be evaluated against specific circuit requirements.