X9221AYSIZ Equivalent & Substitute Parts

Part Overview

The X9221AYSIZ is a digital potentiometer manufactured by Renesas Electronics Corporation, classified as a Data Acquisition component. This 2kΩ dual-circuit device features a 64-tap I2C interface with non-volatile memory and is housed in a 20-SOIC surface mount package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

X9221AYSIZ

Renesas Electronics CorporationIn Stock: 912X9221AYSIZ Datasheet

Current PartRFQ

CAT5221WI-10-T1

onsemiIn Stock: 1597CAT5221WI-10-T1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the X9221AYSIZ is determined by the following critical parameters:

Mandatory Matching Parameters:

• Interface type: I2C
• Number of circuits: 2
• Number of taps: 64
• Package type: 20-SOIC
• Memory type: Non-Volatile
• Mounting type: Surface Mount
• Operating temperature range: -40°C ~ 85°C

Allowable Variation Parameters:

• Resistance value: Substitutes may differ in nominal resistance (2k, 10k, etc.) provided the application circuit accommodates the impedance change
• Supply voltage range: Substitutes with wider or overlapping voltage specifications are acceptable if the application operates within the substitute's specified range
• Wiper resistance: Minor variations are acceptable within typical operating margins

The CAT5221WI-10-T1 qualifies as a functional substitute based on matching interface, circuit count, tap configuration, package, memory type, and temperature range. The primary difference is the 10kΩ nominal resistance versus the 2kΩ of the original part.

Parameter Comparison

Engineering Selection Recommendations

Both the X9221AYSIZ and CAT5221WI-10-T1 are obsolete products with identical RoHS3 compliance, MSL ratings, and REACH status. Selection between these parts depends on circuit-level impedance requirements. The X9221AYSIZ operates at a fixed 5V supply, while the CAT5221WI-10-T1 accepts a wider supply range (2.5V ~ 6V), providing greater flexibility in mixed-voltage system designs. Both devices maintain equivalent I2C protocol compatibility and non-volatile memory functionality across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the CAT5221WI-10-T1 directly replace the X9221AYSIZ without circuit modification?

A: Direct pin-for-pin replacement is possible due to identical 20-SOIC packaging and I2C interface. However, the 10kΩ nominal resistance of the CAT5221WI-10-T1 versus the 2kΩ of the X9221AYSIZ will alter circuit impedance. Applications must accommodate this resistance change or employ external scaling networks.

Q: Are there differences in I2C protocol implementation between these parts?

A: Both devices implement I2C communication with selectable address features and non-volatile memory storage. Protocol compatibility is maintained across both parts.

Q: What is the significance of the wider supply voltage range in the CAT5221WI-10-T1?

A: The CAT5221WI-10-T1 operates from 2.5V to 6V, compared to the X9221AYSIZ fixed 5V specification. This allows the onsemi part to function in systems with lower supply voltages or greater supply tolerance margins.

Q: Do both parts require identical PCB layout and thermal management?

A: Both devices use the same 20-SOIC package with identical physical dimensions (0.295", 7.50mm width). PCB footprints and thermal considerations are equivalent.

Q: What is the impact of different wiper resistance values?

A: The CAT5221WI-10-T1 has a typical wiper resistance of 80Ω compared to 40Ω for the X9221AYSIZ. This affects the output impedance when the potentiometer is used as a voltage divider or in high-impedance sensing circuits.