SM4A105 Equivalent & Substitute Parts

Part Overview

The SM4A105 is a 1 MOhm, 0.25W surface mount trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based component features J lead termination with side adjustment capability and 12 turns of adjustment resolution. The part is classified as obsolete, making identification of suitable substitutes necessary for ongoing production and maintenance applications. The SM-42TA105 serves as the manufacturer-recommended equivalent, offering functional compatibility with updated product status and compliance certifications.

Substiute Parts

SM4A105

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 849SM4A105 Datasheet

Current PartRFQ

SM-42TA105

Nidec Components CorporationIn Stock: 1653SM-42TA105 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SM-42TA105 qualifies as a direct substitute for the SM4A105 based on the following critical parameters:

• Identical resistance value: 1 MOhms
• Identical power rating: 0.25W (1/4W)
• Identical tolerance: ±10%
• Identical temperature coefficient: ±100ppm/°C
• Identical adjustment type: Side Adjustment
• Identical resistive material: Cermet
• Identical mounting type: Surface Mount
• Identical termination style: J Lead
• Identical moisture sensitivity level: MSL 1

Variations in number of turns (12 vs. 11) and face dimensions remain within acceptable substitution parameters for this component category, as the functional electrical characteristics and adjustment mechanism are preserved.

Parameter Comparison

Engineering Selection Recommendations

The SM-42TA105 is the appropriate substitute for the obsolete SM4A105. Selection is based on:

• Active product status of the SM-42TA105 ensures ongoing availability and manufacturing support
• ROHS3 compliance of the SM-42TA105 meets current regulatory requirements, whereas the SM4A105 is non-compliant
• Electrical parameter equivalence across all critical specifications (resistance, power, tolerance, temperature coefficient)
• Identical functional characteristics in adjustment mechanism, mounting, and termination
• Both components share identical REACH and ECCN classifications

The minor dimensional variation and single-turn reduction do not impact functional substitution for this trimmer potentiometer category.

Frequently Asked Questions (FAQ)

Q: Can the SM-42TA105 directly replace the SM4A105 in existing designs?

A: Yes. The SM-42TA105 maintains electrical equivalence across all critical parameters: 1 MOhm resistance, 0.25W power rating, ±10% tolerance, ±100ppm/°C temperature coefficient, cermet construction, J lead termination, and side adjustment mechanism. Physical dimensions are comparable within acceptable tolerances for surface mount applications.

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

A: Both components provide side adjustment capability with high resolution. The 11-turn SM-42TA105 maintains functional adjustment range equivalent to the 12-turn SM4A105 for this resistance value and application category.

Q: Why is RoHS compliance important for this substitution?

A: The SM-42TA105 is ROHS3 compliant, meeting current environmental and regulatory standards. The obsolete SM4A105 is non-compliant. For new designs or production requiring regulatory compliance, the SM-42TA105 is the appropriate selection.

Q: Are there packaging differences between these parts?

A: The SM4A105 packaging information is not specified in available data. The SM-42TA105 is supplied in Tape & Reel (TR) format. Confirm packaging requirements with your procurement specifications.

Q: Do both parts share the same moisture sensitivity rating?

A: Yes. Both the SM4A105 and SM-42TA105 are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.