WMS7202100P Equivalent & Substitute Parts

Part Overview

The WMS7202100P is a digital potentiometer manufactured by Nuvoton Technology Corporation, designed for data acquisition applications. This 100kΩ dual-circuit device features 256 taps, SPI interface control, and non-volatile memory storage. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The through-hole 14-DIP package and cascade pin capability enable flexible circuit integration in legacy and modern applications.

Substiute Parts

WMS7202100P

Nuvoton Technology CorporationIn Stock: 771WMS7202100P Datasheet

Current PartRFQ

MCP42100-E/P

Microchip TechnologyIn Stock: 2294MCP42100-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WMS7202100P is determined by the following critical parameters:

• Resistance value: 100kΩ (exact match required)
• Number of circuits: 2 (exact match required)
• Number of taps: 256 (exact match required)
• Interface protocol: SPI (exact match required)
• Package type: 14-DIP through-hole (exact match required)
• Supply voltage range: 2.7V ~ 5.5V (substitute must support this range)
• Cascade pin feature: Present (exact match required)

The MCP42100-E/P from Microchip Technology meets all primary substitution criteria. While differences exist in memory type (volatile vs. non-volatile), tolerance specification, and temperature coefficient, these variations do not prevent functional substitution in applications where the core electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

The MCP42100-E/P is the primary substitute for the obsolete WMS7202100P. Selection should be based on the following factors:

Product Status Consideration: The WMS7202100P is obsolete, while the MCP42100-E/P maintains active production status with 2200 units in stock, ensuring long-term availability for design continuity.

Compliance Requirements: The MCP42100-E/P is ROHS3 compliant, meeting current regulatory standards. The original WMS7202100P is non-compliant, making the substitute preferable for new designs and systems requiring modern environmental compliance.

Memory Type Difference: The WMS7202100P features non-volatile memory, while the MCP42100-E/P uses volatile memory. Applications requiring power-loss retention of potentiometer settings must account for this functional difference through firmware or circuit design modifications.

Electrical Parameter Variations: The MCP42100-E/P exhibits wider tolerance (±30% vs. ±20%) and higher temperature coefficient (800ppm/°C vs. 500ppm/°C). Applications with strict precision requirements should evaluate whether these variations impact system performance within the specified operating range.

Temperature Range Extension: The MCP42100-E/P supports -40°C to 125°C operation, exceeding the WMS7202100P range of -40°C to 85°C. This extended capability provides additional design flexibility for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the MCP42100-E/P directly replace the WMS7202100P in existing circuits?

A: Yes, for pin-compatible through-hole 14-DIP applications. Both devices share identical pinout, package dimensions, and core electrical specifications (100kΩ, 256 taps, SPI interface, 2.7V–5.5V supply). However, the volatile memory characteristic of the MCP42100-E/P requires evaluation if non-volatile storage is critical to system operation.

Q: What is the impact of the memory type difference?

A: The WMS7202100P retains potentiometer settings after power loss due to non-volatile memory. The MCP42100-E/P requires continuous power or periodic re-programming to maintain settings. Applications must implement appropriate firmware logic or external storage mechanisms if power-loss retention is required.

Q: Are there packaging differences between these parts?

A: Both devices use 14-DIP through-hole packages with identical 0.300" (7.62mm) spacing. The MCP42100-E/P is supplied in tube packaging, while the WMS7202100P packaging specification was not provided. No PCB layout modifications are necessary for substitution.

Q: How do tolerance and temperature coefficient differences affect system design?

A: The MCP42100-E/P has ±30% tolerance versus ±20% for the WMS7202100P, and a higher temperature coefficient (800ppm/°C vs. 500ppm/°C). Applications requiring high precision or operating across wide temperature ranges should evaluate whether these variations remain within acceptable performance margins. Calibration procedures may require adjustment.

Q: Is the MCP42100-E/P suitable for new designs?

A: Yes. The MCP42100-E/P is in active production with ROHS3 compliance, making it the appropriate choice for new designs requiring a 100kΩ dual-circuit digital potentiometer with SPI interface and 14-DIP through-hole packaging. The extended operating temperature range (-40°C to 125°C) provides additional design flexibility.

Q: What is the wiper resistance difference, and does it matter?

A: The WMS7202100P has typical wiper resistance of 80Ω, while the MCP42100-E/P is 175Ω. This difference affects circuit impedance and may impact precision applications. Verify that the higher wiper resistance of the substitute does not degrade system performance in your specific application.