Renesas ISL23418TFUZ

Overview

ISL23418TFUZ from Renesas (formerly Intersil) is a volatile, single-channel, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, 100kΩ end-to-end resistance, 10-lead MSOP package, and operation from 1.7V to 5.5V VCC and 1.2V to 5.5V VLOGIC. It delivers ±0.15 LSB INL in voltage divider mode and supports power supply margining in industrial power systems.

For engineers reviewing the ISL23418TFUZ datasheet, ISL23418TFUZ pinout, ISL23418TFUZ application, or ISL23418TFUZ equivalent, key selection criteria include its 100kΩ resistance option, -40°C to +125°C extended temperature range, shutdown-mode wiper-to-RL short, mid-scale power-on default, and independent VLOGIC for 1.2V logic compatibility without level shifters.

Technical Context

The ISL23418TFUZ implements a monolithic CMOS resistor ladder with CMOS wiper switches and SPI-controlled volatile Wiper Register (WR), enabling precise 8-bit tap positioning. Its "make-before-break" switching ensures glitch-free transitions during wiper movement.

It features dual-supply architecture: VCC powers analog DCP circuitry (1.7V–5.5V), while VLOGIC independently supplies SPI logic (1.2V–5.5V), allowing direct interfacing with low-voltage microcontrollers. Shutdown mode forces RH–RL open-circuit and internally shorts RW to RL via ~2kΩ.

Key Specifications

Pinout & Package

ISL23418TFUZ is housed in a RoHS-compliant 10-lead MSOP package (PKG DWG M10.118), 3.0mm × 3.0mm × 1.0mm, with exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-100 and MCP41HV51-104E/P, ISL23418TFUZ offers lower power consumption (<2.8µA shutdown), wider temperature range (-40°C to +125°C), and true 1.2V logic compatibility-making it optimal for battery-powered, high-reliability industrial and medical systems where volatility is acceptable.

Availability

ISL23418TFUZ is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, and LCD bias compensation requiring stable component supply across extended temperature and low-power operation.

Supply support for ISL23418TFUZ 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, low-power, and extended-temperature ICs for industrial and automotive markets.

The ISL23418TFUZ belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimpots in automated calibration, power management, and sensor signal conditioning applications where programmability, longevity, and temperature stability are critical.

FAQ

What is the total resistance value of the ISL23418TFUZ?

The ISL23418TFUZ has a fixed total resistance of 100kΩ between RH and RL terminals, as specified in the Ordering Information table for part number ISL23418TFUZ (T option). This value is laser-trimmed and guaranteed over temperature, with ±2% tolerance and 70ppm/°C end-to-end temperature coefficient.

Does the ISL23418TFUZ retain wiper position after power cycling?

No, the ISL23418TFUZ is a volatile DCP: its 8-bit Wiper Register (WR) resets to mid-scale (64 decimal, 40h) on every power-up. It does not include EEPROM or non-volatile memory. To restore a specific setting, the host MCU must reprogram the WR after power-on using the SPI interface.

Can the ISL23418TFUZ operate with a 1.2V microcontroller SPI bus?

Yes-the ISL23418TFUZ supports VLOGIC down to 1.2V, allowing direct connection to 1.2V logic without level shifters. Its input thresholds scale with VLOGIC (VIH = 0.7×VLOGIC), and it operates at 1MHz SPI clock rate at this voltage, ensuring robust communication in ultra-low-power systems.

What happens to the wiper during shutdown mode of the ISL23418TFUZ?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23418TFUZ opens the RH–RL path and internally shorts RW to RL via a ~2kΩ resistor. This provides a defined, low-impedance state at the wiper-preventing floating outputs and ensuring predictable behavior during sleep or fault conditions.

Is the ISL23418TFUZ pin-compatible with other members of the ISL23418 family?

Yes-all ISL23418 variants (e.g., ISL23418UFUZ, ISL23418WFUZ) share identical 10-lead MSOP pinout and SPI command structure. Only the total resistance (10kΩ/50kΩ/100kΩ) and marking differ; firmware and PCB layout are fully interchangeable across resistance options.