SM4TW202 Equivalent & Substitute Parts

Part Overview

The SM4TW202 is a 2 kOhms, 0.25W surface mount trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based component features J Lead termination with top adjustment capability and a 12-turn configuration. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing applications and new designs requiring this specification class.

Substiute Parts

SM4TW202

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 747SM4TW202 Datasheet

Current PartRFQ

PVG5A202C03R00

Bourns Inc.In Stock: 1581PVG5A202C03R00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM4TW202 is determined by strict equivalence across the following critical parameters:

• Resistance value: 2 kOhms (exact match required)
• Power rating: 0.25W minimum
• Tolerance: ±10% or better
• Adjustment type: Top Adjustment
• Resistive material: Cermet
• Mounting type: Surface Mount
• Termination style: J Lead
• Moisture sensitivity: MSL 1 or better

The PVG5A202C03R00 meets these substitution criteria. Minor variations in turn count (11 vs. 12 turns) and temperature coefficient (±150ppm/°C vs. ±100ppm/°C) remain within acceptable engineering tolerances for this component class, as both parameters fall within standard operational ranges for trimmer potentiometer applications.

Parameter Comparison

Engineering Selection Recommendations

The PVG5A202C03R00 is the designated manufacturer-recommended substitute for the obsolete SM4TW202. Selection of this alternative is supported by:

• Active product status ensuring long-term availability and supply chain continuity
• ROHS3 compliance, providing regulatory advantage over the non-compliant original part
• Functional equivalence across all critical electrical parameters
• Mechanical compatibility with existing PCB layouts, with face dimensions within 0.004" tolerance
• Identical moisture sensitivity classification, maintaining environmental performance characteristics

The 11-turn configuration of the substitute versus the 12-turn original represents a 8.3% reduction in adjustment resolution. The increased temperature coefficient (±150ppm/°C vs. ±100ppm/°C) introduces marginally higher thermal drift. Both variations remain within standard operational tolerances for trimmer potentiometer applications and do not preclude direct substitution in circuit designs originally specified for the SM4TW202.

Frequently Asked Questions (FAQ)

Q: Can the PVG5A202C03R00 be used as a direct replacement for the SM4TW202 in existing designs?

A: Yes. The substitute meets all critical electrical and mechanical parameters. The 11-turn versus 12-turn difference and ±150ppm/°C versus ±100ppm/°C temperature coefficient variation are within acceptable engineering tolerances for this component class.

Q: What is the impact of the reduced turn count on circuit performance?

A: The 11-turn configuration provides 91.7% of the adjustment resolution of the 12-turn original. For applications requiring fine-tuning precision, this represents a minor reduction in adjustment granularity but does not affect the functional operating range or final resistance value.

Q: Are there packaging differences between the SM4TW202 and PVG5A202C03R00?

A: The substitute is available in Cut Tape (CT) and Digi-Reel® packaging. Verify packaging requirements for your procurement and assembly processes.

Q: Does the improved RoHS compliance of the substitute affect electrical performance?

A: No. ROHS3 compliance reflects manufacturing process changes and material composition but does not alter the electrical characteristics or functional performance of the component.

Q: What are the mechanical footprint considerations for PCB layout?

A: Face dimensions differ by approximately 0.004" in each axis (4.90mm vs. 4.80mm and 3.70mm vs. 4.60mm). Existing PCB layouts designed for the SM4TW202 will accommodate the PVG5A202C03R00 without modification.