SM4A503 Equivalent & Substitute Parts

Part Overview

The SM4A503 is a 50 kOhms, 0.25W surface mount trimmer potentiometer with J Lead termination and Cermet resistive material, manufactured by Vishay Beyschlag/Draloric/BC Components. This component features 12-turn side adjustment capability and is designed for precision applications requiring manual calibration in compact form factors.

The SM4A503 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

SM4A503

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 865SM4A503 Datasheet

Current PartRFQ

PVG5H503C03R00

Bourns Inc.In Stock: 2798PVG5H503C03R00 Datasheet

MFR RecommendedRFQ

SM-42TA503

Nidec Components CorporationIn Stock: 4685SM-42TA503 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SM4A503 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Resistance value: 50 kOhms (exact match required)
• Power rating: 0.25W / 1/4W (exact match required)
• Tolerance: ±10% (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)
• Moisture sensitivity level: 1 (Unlimited) (exact match required)

Acceptable variations within substitution criteria include:

• Number of turns: 11–12 turns (minor variation acceptable for adjustment resolution)
• Temperature coefficient: ±100–±150ppm/°C (minor variation acceptable for thermal stability)
• Physical dimensions: Minor variations in face dimensions acceptable if PCB footprint compatibility is maintained

Parameter Comparison

Engineering Selection Recommendations

Both PVG5H503C03R00 and SM-42TA503 meet the core electrical and mechanical requirements for substitution of the SM4A503.

PVG5H503C03R00 (Bourns Inc.) is recommended as the primary substitute. This part maintains active product status, achieves ROHS3 compliance, and demonstrates the closest dimensional compatibility with the original SM4A503. The temperature coefficient variation (±150ppm/°C versus ±100ppm/°C) and single-turn reduction (11 versus 12 turns) represent acceptable deviations for most applications. Packaging is supplied in Tape & Reel format with 2714 units in stock.

SM-42TA503 (Nidec Components Corporation) is qualified as a secondary substitute. This part maintains identical temperature coefficient performance (±100ppm/°C) and active product status with ROHS3 compliance. The face dimension increase (0.189" x 0.181" versus 0.193" x 0.146") requires verification of PCB layout compatibility. Packaging is supplied in Tape & Reel format with 4618 units in stock.

Both substitutes are classified as REACH Affected or REACH Unaffected and carry the same ECCN and HTSUS codes as the original part, supporting regulatory and trade compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the PVG5H503C03R00 be used as a direct replacement for the SM4A503?

A: Yes. The PVG5H503C03R00 meets all critical electrical parameters: 50 kOhms resistance, 0.25W power rating, ±10% tolerance, Cermet material, J Lead termination, and side adjustment. The 11-turn configuration versus 12 turns represents a minor adjustment resolution difference acceptable for most calibration applications. Dimensional compatibility (4.80mm x 3.70mm versus 4.90mm x 3.70mm) requires PCB footprint verification.

Q: What is the difference between the two substitute parts?

A: Both parts share identical electrical specifications (50 kOhms, 0.25W, ±10% tolerance, Cermet, J Lead, side adjustment). The primary differences are: (1) Temperature coefficient: PVG5H503C03R00 is ±150ppm/°C; SM-42TA503 is ±100ppm/°C; (2) Physical dimensions: PVG5H503C03R00 is 4.80mm x 3.70mm; SM-42TA503 is 4.80mm x 4.60mm; (3) Manufacturer: Bourns versus Nidec Components Corporation.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both PVG5H503C03R00 and SM-42TA503 are ROHS3 compliant. The original SM4A503 is RoHS non-compliant. If RoHS compliance is a design requirement, either substitute part satisfies this requirement.

Q: Will the dimensional differences affect PCB assembly?

A: The PVG5H503C03R00 (4.80mm x 3.70mm) is dimensionally closer to the SM4A503 (4.90mm x 3.70mm) and presents minimal layout impact. The SM-42TA503 (4.80mm x 4.60mm) has a larger height dimension and requires verification that the PCB footprint and surrounding component placement accommodate this increase.

Q: What is the impact of the temperature coefficient difference?

A: The PVG5H503C03R00 has a temperature coefficient of ±150ppm/°C compared to the SM4A503 at ±100ppm/°C. This represents a 50% increase in temperature-induced resistance drift. For applications with strict thermal stability requirements, the SM-42TA503 (±100ppm/°C) maintains identical thermal performance to the original part.

Q: Are packaging formats compatible with existing assembly processes?

A: Both substitute parts are supplied in Tape & Reel (TR) packaging, standard for surface mount assembly automation. Verify that your assembly equipment supports the specific reel dimensions and component pitch for these parts.