Renesas ISL22343WFV20Z-TK

Overview

ISL22343WFV20Z-TK from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution, I²C interface, 10kΩ end-to-end resistance, dual supply operation (VCC = 2.25–5.5V, V− = −2.25 to −5.5V), and extended industrial temperature range (−40°C to +125°C). It enables precise analog parameter tuning in bipolar signal conditioning circuits.

For engineers reviewing the ISL22343WFV20Z-TK datasheet, ISL22343WFV20Z-TK pinout, ISL22343WFV20Z-TK application, or ISL22343WFV20Z-TK equivalent, key selection criteria include wiper resistance (70Ω typ), non-volatile initial value storage, DCP-to-DCP matching (±2 LSB), shutdown current (<4µA), and TSSOP-20 package compatibility with high-density PCB layouts.

Technical Context

The ISL22343WFV20Z-TK integrates four independent 256-tap DCPs with volatile Wiper Registers (WRi) and non-volatile Initial Value Registers (IVRi), enabling power-up recall of preset wiper positions. Each DCP supports voltage divider or rheostat configurations with ±3.0mA max wiper current.

Its I²C interface features three address pins (A0–A2), supporting up to eight devices on one bus, and operates at 400kHz clock frequency. Dual-supply architecture allows bipolar terminal voltage swing between V− and VCC, critical for AC-coupled or rail-to-rail analog signal paths.

Key Specifications

Pinout & Package

ISL22343WFV20Z-TK uses a 20-lead Pb-free TSSOP package (M20.173), optimized for thermal performance and surface-mount assembly. Pin mapping is validated per FN6423 Rev 2.00 datasheet, Page 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5242BRUZ10 and MCP45HV51-103E/ST, the ISL22343WFV20Z-TK uniquely delivers quad DCPs with integrated dual-supply operation and non-volatile GP memory-enabling compact, self-contained analog tuning in harsh bipolar signal environments without interface translation or external level shifting.

Availability

ISL22343WFV20Z-TK is available at Aetrix Electronics and suitable for industrial motor control, medical instrumentation, and automotive sensor conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL22343WFV20Z-TK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics acquired Intersil in 2017 and maintains its precision analog portfolio, emphasizing high-reliability ICs for automotive, industrial, and computing markets.

The ISL22343WFV20Z-TK belongs to Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical pots in automated calibration, sensor signal conditioning, and programmable analog front-ends.

FAQ

What is the maximum wiper current rating for the ISL22343WFV20Z-TK?

The ISL22343WFV20Z-TK specifies a maximum wiper current of ±3.0mA under recommended operating conditions. This limit applies regardless of tap position and must be observed to prevent resistor element degradation or wiper contact damage. Exceeding this current may cause irreversible drift in end-to-end resistance or increased wiper resistance over time. The 70Ω typical wiper resistance contributes to voltage drop under load, so designers should verify that the resulting error remains within system accuracy budgets when using the ISL22343WFV20Z-TK in rheostat mode.

Does the ISL22343WFV20Z-TK support true bipolar operation, and how is it implemented?

Yes, the ISL22343WFV20Z-TK supports true bipolar operation via dedicated V− and VCC supply pins, allowing DCP terminals (RHx, RLx, RWx) to swing between −5.5V and +5.5V relative to GND. This is implemented using a dual-supply CMOS process that isolates analog and digital domains while maintaining I²C logic compatibility with VCC-referenced SDA/SCL. Unlike single-supply DCPs requiring external level shifters, the ISL22343WFV20Z-TK directly interfaces with AC-coupled sensors or op-amps operating on split rails-enabling zero-centered gain control without added components.

How does non-volatile memory function in the ISL22343WFV20Z-TK, and what is its endurance?

The ISL22343WFV20Z-TK incorporates EEPROM-based non-volatile memory for four Initial Value Registers (IVRi) and eleven General Purpose registers, rated for 1,000,000 write cycles and 50 years of data retention at ≤+55°C. At power-up, the device automatically loads IVRi contents into corresponding volatile Wiper Registers (WRi), restoring pre-programmed settings without host intervention. Writes to IVRi require explicit I²C commands and take 12–20ms to complete; during this time, the WIP bit in the Access Control Register prevents concurrent access. This architecture ensures deterministic startup behavior in mission-critical systems.

Can the ISL22343WFV20Z-TK be used in rheostat mode, and what are the key specifications in that configuration?

Yes, the ISL22343WFV20Z-TK supports rheostat mode by connecting either RHx or RLx to a fixed potential and using RWx with the other terminal floating. In this configuration, resistance between RWx and the grounded terminal varies from near-zero to 10kΩ (for W-option) with ±0.5 MI typical DNL and ±1 MI INL. Wiper resistance remains 70Ω typical, and temperature coefficient is ±40 ppm/°C. Rheostat mode is commonly used for programmable current limiting or LED brightness control where only two-terminal variable resistance is needed-retaining all I²C control and non-volatile storage benefits of the ISL22343WFV20Z-TK.

What are the I²C address configuration options for the ISL22343WFV20Z-TK?

The ISL22343WFV20Z-TK uses three hardware address pins (A0, A1, A2) to set bits 2–0 of its 7-bit I²C slave address, with the upper four bits fixed as '1010'. This allows eight unique addresses (0xA0–0xA7) on a single bus. Address recognition occurs on the falling edge of SCL after the START condition; mismatched addresses cause the device to ignore subsequent bytes. Pull-up or pull-down resistors on A0–A2 must be stable before the first I²C transaction. The ISL22343WFV20Z-TK does not support software-configurable addresses or dynamic address changing during operation.