Renesas ISL23418UFUZ-T7A

Overview

ISL23418UFUZ-T7A from Renesas (formerly Intersil) is a volatile, single-channel, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, 50kΩ end-to-end resistance, 10-lead µTQFN package, and extended industrial temperature range (–40°C to +125°C). It functions as a programmable voltage divider or rheostat in low-power analog tuning applications such as LCD bias compensation and RF amplifier bias control.

For engineers reviewing the ISL23418UFUZ-T7A datasheet, ISL23418UFUZ-T7A pinout, ISL23418UFUZ-T7A application, or ISL23418UFUZ-T7A equivalent, key selection criteria include its dual-supply operation (VCC = 1.7–5.5V, VLOGIC = 1.2–5.5V), mid-scale power-on default (64-tap), shutdown mode with RW–RL shorting, <2.8µA standby current, and verified 50kΩ resistance tolerance (±2%) and ratiometric tempco (4 ppm/°C).

Technical Context

The ISL23418UFUZ-T7A implements a monolithic CMOS resistor ladder with 128 discrete taps and CMOS wiper switches operating in "make-before-break" mode. Its 8-bit volatile Wiper Register (WR) directly controls wiper position, with power-on reset to 0x40 (64 decimal), ensuring repeatable mid-scale startup behavior.

It supports SPI Mode 0 (CPOL = 0, CPHA = 0) with configurable SDO output (push-pull or open-drain), daisy-chain capability for multi-device systems, and independent logic/analog supplies enabling direct interfacing with 1.2V microcontrollers without level shifters. Shutdown mode forces RH–RL open-circuit while internally connecting RW to RL via ~2kΩ.

Key Specifications

Pinout & Package

ISL23418UFUZ-T7A uses a 10-lead 2.1 mm × 1.6 mm µTQFN package (RoHS-compliant, MSL3, pkg drawing L10.2.1x1.6A), optimized for space-constrained portable and industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5175BRMZ-50 and MCP41050-I/P, the ISL23418UFUZ-T7A uniquely combines 1.2V logic compatibility, ultra-low standby current (<2.8µA), and daisy-chain capability-making it optimal for battery-powered, multi-channel, mixed-voltage analog tuning systems where power, flexibility, and precision are jointly constrained.

Availability

ISL23418UFUZ-T7A is available at Aetrix Electronics and suitable for power supply margining, RF amplifier biasing, and portable medical calibration requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL23418UFUZ-T7A 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 Corporation (formerly Intersil) is a global semiconductor leader specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The ISL23418UFUZ-T7A belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered for precision, low-power, and flexible analog tuning in battery-operated and thermally demanding applications.

FAQ

What is the default wiper position of the ISL23418UFUZ-T7A at power-on?

The ISL23418UFUZ-T7A powers up with its volatile Wiper Register (WR) preset to 0x40 (64 decimal), placing the wiper at mid-scale-exactly halfway between RL and RH terminals. This ensures a known, repeatable starting point for voltage divider or rheostat operation without host initialization.

Does the ISL23418UFUZ-T7A support daisy-chaining with other DCPs?

Yes, the ISL23418UFUZ-T7A supports daisy-chain configuration via its SDO and SDI pins. Multiple devices can share a single SCK and CS line, with SDO of one device connected to SDI of the next. This reduces GPIO usage and enables simultaneous wiper updates across channels in multi-pot systems.

What is the maximum SPI clock frequency supported by the ISL23418UFUZ-T7A?

The ISL23418UFUZ-T7A supports up to 5 MHz SCK frequency when VLOGIC ≥ 1.7V. At lower logic supplies (1.2V ≤ VLOGIC < 1.7V), the maximum SCK frequency is reduced to 1 MHz to ensure reliable timing margin and signal integrity.

How does the shutdown mode affect the ISL23418UFUZ-T7A's terminals?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23418UFUZ-T7A opens the RH–RL path and internally connects RW to RL through a ~2kΩ resistor. This provides a defined, low-leakage termination state while preserving the last wiper register value for fast restoration upon exit.

Is the ISL23418UFUZ-T7A compatible with 1.2V microcontrollers?

Yes-the ISL23418UFUZ-T7A features a dedicated VLOGIC pin supporting 1.2V to 5.5V, enabling direct SPI communication with 1.2V I/O microcontrollers without external level shifters. Input thresholds scale with VLOGIC, and SDO output is configurable for push-pull or open-drain operation.