SM4ETA101 Equivalent & Substitute Parts Reference

Part Overview

The SM4ETA101 is a 100 Ohms, 0.25W (1/4W) surface mount trimmer potentiometer manufactured by Nidec Components Corporation. This cermet-based component features J Lead termination with side adjustment capability and 12-turn resolution. The part is classified as obsolete, making identification of compatible 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

SM4ETA101

Nidec Components CorporationIn Stock: 869SM4ETA101 Datasheet

Current PartRFQ

SM-42TA101

Nidec Components CorporationIn Stock: 3646SM-42TA101 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SM-42TA101 qualifies as a direct substitute for the SM4ETA101 based on the following critical parameters:

• Electrical Equivalence: Identical resistance value (100 Ohms) and power rating (0.25W/1/4W)
• Tolerance & Temperature Stability: Matching tolerance (±10%) and temperature coefficient (±100ppm/°C)
• Mechanical Compatibility: Same adjustment type (side adjustment), resistive material (cermet), mounting type (surface mount), and termination style (J Lead)
• Regulatory Compliance: Both parts maintain ROHS3 compliance and identical MSL rating (1 - Unlimited)
• Physical Footprint: Face dimensions are within acceptable manufacturing variation (0.189" x 0.181" vs. 0.193" x 0.177")

The primary difference is the number of turns (11 turns vs. 12 turns) and active product status of the substitute, which does not affect functional substitution in applications where the specified electrical parameters are met.

Parameter Comparison

Engineering Selection Recommendations

The SM-42TA101 is the qualified substitute for the obsolete SM4ETA101. Selection is based on:

• Product Status: The SM-42TA101 maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete SM4ETA101.
• Regulatory Compliance: Both parts meet ROHS3 requirements and carry identical MSL ratings, confirming suitability for current manufacturing and storage standards.
• Electrical Performance: Matching resistance, power rating, tolerance, and temperature coefficient ensure functional equivalence in circuit applications.
• Physical Integration: Minimal dimensional variation between face sizes (0.004" to 0.006" difference) is within standard PCB layout tolerances for surface mount components.

The 11-turn versus 12-turn difference does not impact substitution eligibility, as both configurations deliver the specified electrical performance within the stated tolerance band.

Frequently Asked Questions (FAQ)

Q: Can the SM-42TA101 be used as a direct replacement for SM4ETA101 in existing designs?

A: Yes. The SM-42TA101 meets all critical electrical parameters (resistance, power rating, tolerance, temperature coefficient) and mechanical requirements (surface mount, J Lead termination, side adjustment) specified for the SM4ETA101. The minor dimensional variation is within standard PCB layout tolerances.

Q: What is the significance of the 12-turn versus 11-turn difference?

A: Both configurations deliver the same electrical performance within the ±10% tolerance specification. The turn count affects adjustment resolution but does not alter the functional substitution criteria for this component category.

Q: Are there packaging differences between these parts?

A: The SM4ETA101 packaging is listed as standard, while the SM-42TA101 is supplied in Tape & Reel (TR) format. Both are surface mount components suitable for automated assembly processes.

Q: Why is the SM4ETA101 classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The SM-42TA101 from the same manufacturer provides functional continuity and is recommended for new designs and ongoing production requirements.

Q: Are both parts RoHS compliant?

A: Yes. Both the SM4ETA101 and SM-42TA101 are ROHS3 compliant and carry MSL rating 1 (Unlimited), confirming suitability for current manufacturing standards and storage conditions.