SM4ETA503 Equivalent & Substitute Parts Reference

Part Overview

The SM4ETA503 is a 50 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 substitute components 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

SM4ETA503

Nidec Components CorporationIn Stock: 830SM4ETA503 Datasheet

Current PartRFQ

SM-42TA503

Nidec Components CorporationIn Stock: 4685SM-42TA503 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM4ETA503 is determined by strict equivalence across the following critical parameters:

• Resistance value: 50 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 (exact match required)

The SM-42TA503 meets all substitution criteria. Minor variations in the 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-42TA503 is the direct functional equivalent for the obsolete SM4ETA503. Both components are manufactured by Nidec Components Corporation and maintain identical electrical specifications across resistance, power rating, tolerance, and temperature coefficient. The substitute part carries active product status, ensuring continued availability and supply chain reliability.

Both parts satisfy ROHS3 compliance requirements and carry identical moisture sensitivity ratings. The SM-42TA503 is supplied in Tape & Reel packaging, which is standard for production environments and offers advantages in automated assembly processes compared to bulk packaging.

The minor reduction in turn count (11 vs. 12) and dimensional variance (less than 0.01" difference in each axis) do not affect electrical performance or functional compatibility in standard applications. Physical dimensions remain within typical PCB layout tolerances for surface mount trimmer potentiometers.

Frequently Asked Questions (FAQ)

Q: Can SM-42TA503 be used as a direct replacement for SM4ETA503?

A: Yes. Both components share identical electrical specifications: 50 kOhms resistance, 0.25W power rating, ±10% tolerance, and ±100ppm/°C temperature coefficient. Mechanical compatibility is maintained through identical mounting type (surface mount), termination style (J lead), and adjustment mechanism (side adjustment).

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

A: Turn count affects adjustment resolution and tuning range granularity. The 11-turn SM-42TA503 provides slightly coarser adjustment steps compared to the 12-turn SM4ETA503. For applications requiring precise resistance tuning, this difference should be evaluated against specific circuit requirements. Both parts maintain the same resistance tolerance specification.

Q: Are there packaging considerations when switching to SM-42TA503?

A: The SM4ETA503 is supplied in bulk packaging, while SM-42TA503 is supplied in Tape & Reel format. Tape & Reel packaging is optimized for automated pick-and-place assembly and reduces handling time in production environments. Manual assembly processes may require reeling equipment or manual component extraction.

Q: Do both parts meet the same compliance standards?

A: Yes. Both SM4ETA503 and SM-42TA503 are ROHS3 compliant and carry Moisture Sensitivity Level 1 (unlimited). Both are classified under ECCN EAR99 and HTSUS 8533.40.8050.

Q: What is the physical size difference between these parts?

A: SM4ETA503 measures 0.193" x 0.177" (4.90mm x 4.50mm), while SM-42TA503 measures 0.189" x 0.181" (4.80mm x 4.60mm). The difference is approximately 0.004" in each dimension, which falls within standard PCB layout tolerances for surface mount components.