WMS7170010S Digital Potentiometer Equivalent & Substitute Parts

Part Overview

The WMS7170010S is a digital potentiometer manufactured by Nuvoton Technology Corporation, designed for data acquisition applications. This 10kΩ, 100-tap device features a linear taper with up/down control interface and non-volatile memory, housed in an 8-SOIC surface mount package. The product is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring similar functionality.

Substiute Parts

WMS7170010S

Nuvoton Technology CorporationIn Stock: 723WMS7170010S Datasheet

Current PartRFQ

X9317US8IZ

Renesas Electronics CorporationIn Stock: 3878X9317US8IZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the WMS7170010S is determined by the following critical parameters:

• Package Compatibility: 8-SOIC form factor is mandatory for direct PCB replacement
• Interface Protocol: Up/Down (U/D, INC, CS) control interface must be maintained
• Memory Architecture: Non-volatile memory requirement must be preserved
• Tap Configuration: 100-tap resolution is the functional standard
• Operating Voltage Range: Supply voltage compatibility within specified limits
• Temperature Range: Operating temperature envelope must encompass -40°C to 85°C
• Taper Type: Linear taper characteristic must be maintained

The X9317US8IZ from Renesas Electronics Corporation meets these core substitution criteria. While the resistance value differs (50kΩ versus 10kΩ), this represents a functional variant within the same product family, suitable for applications where the higher resistance value is acceptable or where circuit design can accommodate the parameter change.

Parameter Comparison

Engineering Selection Recommendations

The X9317US8IZ is the designated substitute for the obsolete WMS7170010S based on the following engineering criteria:

Product Status: The WMS7170010S is obsolete, while the X9317US8IZ maintains active production status with confirmed inventory availability (3845 units in stock). This ensures long-term supply chain viability.

Regulatory Compliance: The X9317US8IZ is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The original WMS7170010S is RoHS non-compliant, making the substitute preferable for new designs and compliance-sensitive applications.

Functional Compatibility: Both devices share identical package geometry (8-SOIC), interface protocol (Up/Down control), memory type (non-volatile), tap resolution (100 taps), and operating temperature range (-40°C to 85°C). These parameters ensure direct functional substitution at the system level.

Resistance Value Consideration: The X9317US8IZ operates at 50kΩ compared to the 10kΩ of the original part. Circuit designers must evaluate whether this five-fold increase in resistance value is compatible with the application's impedance requirements and control characteristics.

Supply Voltage: The X9317US8IZ operates at a fixed 5V supply, whereas the WMS7170010S accepts 2.7V to 5.5V. Applications requiring operation below 5V must be redesigned or alternative substitutes identified.

Frequently Asked Questions (FAQ)

Q: Can the X9317US8IZ directly replace the WMS7170010S without circuit modification?

A: Direct PCB replacement is possible due to identical 8-SOIC packaging and pinout compatibility. However, the 50kΩ resistance value requires circuit evaluation. Applications designed for 10kΩ operation may require impedance adjustments or gain compensation in associated analog circuits.

Q: What is the primary reason for substitution?

A: The WMS7170010S is obsolete. The X9317US8IZ is an active product with confirmed supply availability, ensuring long-term component sourcing and manufacturing continuity.

Q: Are there compatibility issues with the supply voltage difference?

A: The X9317US8IZ requires a fixed 5V supply, while the original part accepts 2.7V to 5.5V. Systems operating at voltages below 5V cannot use this substitute without power supply redesign.

Q: Does the substitute meet current regulatory requirements?

A: Yes. The X9317US8IZ is ROHS3 compliant and REACH unaffected, meeting current environmental standards. The original WMS7170010S is RoHS non-compliant.

Q: How do the tap resolutions compare?

A: Both devices feature 100-tap resolution with linear taper characteristics, ensuring equivalent resolution and control granularity.

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

A: The WMS7170010S specifies 300ppm/°C, while the X9317US8IZ specifies ±300ppm/°C. Both values are within typical digital potentiometer specifications and do not represent a functional limitation for most applications.

Q: Is the interface protocol identical?

A: Yes. Both devices use the Up/Down (U/D, INC, CS) control interface, ensuring software and firmware compatibility without modification.