ISL23328TFVZ Equivalent & Substitute Parts

Part Overview

The ISL23328TFVZ is a digital potentiometer manufactured by Renesas Electronics Corporation, classified as a Data Acquisition component. This device features a 100k Ohm resistance value with 2 circuits and 128 taps, utilizing an I2C interface for control. The part is currently listed as Obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement planning. The device operates across a supply voltage range of 1.2V to 5.5V and 1.7V to 5.5V, with an operating temperature range of -40°C to 125°C.

Substiute Parts

ISL23328TFVZ

Renesas Electronics CorporationIn Stock: 979ISL23328TFVZ Datasheet

Current PartRFQ

ISL23328WFRUZ-TK

Renesas Electronics CorporationIn Stock: 919ISL23328WFRUZ-TK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ISL23328TFVZ is determined by the following critical parameters that must remain consistent or compatible:

• Interface Type: I2C protocol compatibility is mandatory for direct substitution
• Number of Circuits: 2 circuits required
• Number of Taps: 128 taps for resolution equivalence
• Memory Type: Volatile memory characteristic
• Supply Voltage Range: Overlap within 1.2V ~ 5.5V and 1.7V ~ 5.5V specifications
• Operating Temperature Range: -40°C ~ 125°C compatibility
• Taper Configuration: Linear taper required
• Tolerance: ±20% specification
• Series: XDCP™ series designation

The identified substitute ISL23328WFRUZ-TK shares the same base product number (ISL23328) and maintains compatibility across interface, circuit count, tap resolution, memory type, voltage supply, operating temperature, taper, tolerance, and series designation. Variations exist in resistance value (10k vs. 100k), package type (16-UTQFN vs. 14-TSSOP), temperature coefficient, and moisture sensitivity level.

Parameter Comparison

Engineering Selection Recommendations

The ISL23328WFRUZ-TK is identified as an active substitute for the obsolete ISL23328TFVZ. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The substitute offers improved moisture sensitivity characteristics (MSL 1 vs. MSL 3), providing enhanced reliability in humid environments.

Selection between these parts requires evaluation of resistance value requirements. The ISL23328TFVZ operates at 100k Ohms, while the ISL23328WFRUZ-TK operates at 10k Ohms. This tenfold difference in resistance value represents a fundamental circuit parameter that must be verified against application requirements. The substitute exhibits a higher temperature coefficient (125ppm/°C vs. 45ppm/°C), which may impact precision applications requiring tight temperature stability.

Package geometry differs between the two devices: the ISL23328TFVZ uses 14-TSSOP (0.173", 4.40mm width), while the ISL23328WFRUZ-TK uses 16-UTQFN (2.6x1.8mm). PCB layout and footprint compatibility must be confirmed prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can ISL23328WFRUZ-TK directly replace ISL23328TFVZ in existing designs?

A: Direct replacement requires verification of three critical factors: (1) resistance value compatibility—the substitute operates at 10k Ohms versus the original 100k Ohms; (2) PCB footprint accommodation—package geometry differs between 14-TSSOP and 16-UTQFN; (3) temperature coefficient tolerance—the substitute exhibits 125ppm/°C versus 45ppm/°C. Functional equivalence exists for I2C interface, circuit count, tap resolution, and operating parameters, but circuit-level resistance requirements must be confirmed.

Q: What are the key substitution criteria for ISL23328 series digital potentiometers?

A: Substitution within the ISL23328 series is determined by: I2C interface compatibility, 2-circuit configuration, 128-tap resolution, volatile memory type, 1.2V to 5.5V supply voltage overlap, -40°C to 125°C operating temperature range, linear taper, ±20% tolerance, and XDCP™ series designation. Resistance value, package type, temperature coefficient, and moisture sensitivity level may vary between equivalent parts.

Q: How does the moisture sensitivity level difference affect component selection?

A: The ISL23328TFVZ specifies MSL 3 (168 hours maximum floor life), while ISL23328WFRUZ-TK specifies MSL 1 (unlimited floor life). MSL rating indicates moisture absorption capacity and reflow soldering stress tolerance. MSL 1 provides superior moisture resistance and extended shelf life without baking requirements, beneficial for long-term inventory management and humid storage environments.

Q: What impact does the temperature coefficient difference have on circuit performance?

A: The ISL23328TFVZ exhibits 45ppm/°C temperature coefficient, while ISL23328WFRUZ-TK exhibits 125ppm/°C. This represents a 2.8x difference in resistance drift per degree Celsius. Applications requiring high precision across temperature ranges should evaluate whether the higher coefficient of the substitute introduces unacceptable performance variation. The original part provides superior temperature stability.

Q: Are there packaging considerations for PCB redesign?

A: Yes. The ISL23328TFVZ uses 14-TSSOP package (0.173" width, 4.40mm), while ISL23328WFRUZ-TK uses 16-UTQFN (2.6x1.8mm). The UTQFN package is smaller and features different pin configuration. PCB layout, trace routing, and component placement must be re-evaluated. Footprint libraries and design files require updates to accommodate the new package geometry.