SM4W104 Equivalent & Substitute Parts

Part Overview

The SM4W104 is a 100 kOhms surface mount trimmer potentiometer manufactured by Vishay Beyschlag/Draloric/BC Components. This cermet-based component features 0.25W power rating, ±10% tolerance, and top adjustment capability with J Lead termination. The product is currently obsolete, necessitating identification of functionally equivalent active alternatives for new designs and ongoing production requirements.

Substiute Parts

SM4W104

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1033SM4W104 Datasheet

Current PartRFQ

3214W-1-104E

Bourns Inc.In Stock: 152793214W-1-104E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM4W104 is determined by matching the following critical parameters:

• Resistance value: 100 kOhms
• Power rating: 0.25W minimum
• Tolerance: ±10% or better
• Temperature coefficient: ±100ppm/°C or better
• Adjustment type: Top Adjustment
• Resistive material: Cermet
• Mounting type: Surface Mount
• Termination style: J Lead
• Moisture sensitivity: MSL 1 or equivalent

The 3214W-1-104E from Bourns Inc. satisfies all substitution criteria and is classified as an MFR (Manufacturer) Recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

The 3214W-1-104E is the qualified substitute for the obsolete SM4W104. Selection of this alternative is supported by:

• Identical electrical specifications across all critical parameters
• Active product status with established supply chain availability
• ROHS3 compliance, meeting current regulatory requirements for new designs
• Minimal physical dimension variance (0.004" and 0.008" differences in face dimensions), compatible with existing PCB layouts
• Sealed design classification providing enhanced environmental protection

The primary design consideration is the reduction in adjustment turns from 12 to 5. This affects tuning resolution and adjustment speed but does not impact electrical performance or functional compatibility in applications where the specified resistance and power rating are the controlling factors.

Frequently Asked Questions (FAQ)

Q: Can the 3214W-1-104E directly replace the SM4W104 in existing designs?

A: Yes. All electrical parameters match exactly. Physical dimensions are within 0.5% variance. Verify PCB layout clearances for the slightly smaller footprint (4.80mm x 4.60mm versus 4.90mm x 3.70mm).

Q: What is the significance of the turn count difference (12 turns versus 5 turns)?

A: Turn count affects adjustment resolution and the mechanical range per degree of rotation. The 5-turn design requires faster rotation to traverse the full resistance range. Electrical performance and final resistance value are unaffected.

Q: Is the 3214W-1-104E suitable for new product designs?

A: Yes. The part is active, ROHS3 compliant, and carries REACH Affected status, meeting current regulatory requirements for new designs.

Q: Are there packaging differences between these parts?

A: The SM4W104 packaging is not specified in available data. The 3214W-1-104E is supplied in Cut Tape (CT) and Digi-Reel® packaging formats.

Q: What is the impact of the RoHS compliance difference?

A: The SM4W104 is RoHS non-compliant. The 3214W-1-104E is ROHS3 compliant. For new designs and applications subject to RoHS regulations, the 3214W-1-104E is the required selection.