Renesas ISL22343WFR20Z

Overview

ISL22343WFR20Z from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) in 20-lead QFN package, featuring 256-tap resolution, I²C interface, non-volatile wiper position storage, dual supply operation (V_CC = 2.25–5.5V, V₋ = −2.25 to −5.5V), and 10kΩ end-to-end resistance. It enables precision analog trimming in bipolar signal paths such as programmable gain amplifiers and offset calibration circuits.

For engineers reviewing the ISL22343WFR20Z datasheet, ISL22343WFR20Z pinout, ISL22343WFR20Z application, or ISL22343WFR20Z equivalent, this page delivers verified specifications, validated QFN pin mapping, real-world use cases in industrial sensor conditioning and audio level control, and two confirmed alternative parts with documented functional and parametric differences.

Technical Context

The ISL22343WFR20Z integrates four independent DCPs on a single monolithic CMOS die, each with volatile Wiper Registers (WRi) and non-volatile Initial Value Registers (IVRi). Its I²C interface supports up to eight devices per bus via A0–A2 address pins and operates at 400kHz maximum clock frequency.

Each DCP functions either as a three-terminal voltage divider or two-terminal rheostat, with wiper movement implemented in "make-before-break" switching mode. Power-up recall loads IVRi contents into WRi, ensuring repeatable startup states without host intervention.

Key Specifications

Pinout & Package

ISL22343WFR20Z uses a 20-lead QFN package (5mm × 5mm, L20.5x5) with exposed die pad internally connected to V₋. PCB thermal land for the EPAD must be connected to the V₋ plane or left floating per TB389.

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, ISL22343WFR20Z uniquely combines quad integration, bipolar supply capability, and guaranteed power-on wiper recall-enabling self-contained, maintenance-free analog tuning in harsh industrial environments without host dependency.

Availability

ISL22343WFR20Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, and bipolar signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL22343WFR20Z 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 full technical and supply chain responsibility for legacy Intersil precision analog products.

The ISL22343WFR20Z belongs to the XDCP™ family of digitally controlled potentiometers designed specifically for replacing mechanical trimpots in automated test equipment, industrial automation, and high-reliability embedded systems.

FAQ

What is the package type and footprint of ISL22343WFR20Z?

ISL22343WFR20Z uses a 20-lead QFN package (5mm × 5mm, L20.5x5) with an exposed die pad internally tied to V₋. The recommended PCB layout connects the EPAD to the V₋ plane for optimal thermal performance. Pinout matches the official FN6423 Rev 2.00 datasheet Figure 2 (QFN top view), with RW0–RW3 on pins 18–1, RH0–RH3 on pins 16, 13, 10, and 1, and RL0–RL3 on pins 17, 12, 9, and 2.

Does ISL22343WFR20Z support true bipolar operation?

Yes, ISL22343WFR20Z supports true bipolar operation with independent V_CC (2.25–5.5V) and V₋ (−2.25 to −5.5V) supplies. This allows wiper voltages to swing fully between the two rails, enabling direct connection to op-amps operating on split supplies without level-shifting circuitry. The DCP terminals (RH/RL/RW) are rated for voltage ranges from V₋ to V_CC, as confirmed in Absolute Maximum Ratings on page 4 of FN6423.

How does non-volatile wiper recall work on ISL22343WFR20Z?

At power-up, ISL22343WFR20Z automatically recalls the contents of its four non-volatile Initial Value Registers (IVR0–IVR3) into the corresponding volatile Wiper Registers (WR0–WR3), positioning all wipers to their last-saved state. This occurs after V_CC exceeds 1.9V (V_POR) and completes within 5ms (t_D). No host intervention is required, making ISL22343WFR20Z ideal for systems needing deterministic startup behavior.

Can ISL22343WFR20Z be used as a rheostat?

Yes, each of the four DCPs in ISL22343WFR20Z can be configured as a two-terminal variable resistor (rheostat) by connecting either RH or RL to the desired fixed potential and using RW as the adjustable terminal. The datasheet specifies R_INL and R_DNL performance in rheostat mode, with ±1MI integral non-linearity and monotonicity across all 256 taps - validated for precision current-source calibration and LED bias control.

What is the maximum I²C clock frequency supported by ISL22343WFR20Z?

ISL22343WFR20Z supports I²C fast-mode operation up to 400kHz, as specified in the Serial Interface Specs table on page 7 of FN6423. Timing parameters including t_LOW (1300ns min), t_HIGH (600ns min), and t_BUF (1300ns min) are fully compliant with I²C Specification Version 2.1. The device responds to standard 7-bit slave addresses formed by A2/A1/A0, enabling up to eight units on a single bus.