Renesas ISL23418WFUZ-TK

Overview

ISL23418WFUZ-TK from Renesas Electronics (formerly Intersil) is a volatile, single-channel, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, 10kΩ end-to-end resistance, ±0.15 LSB integral nonlinearity, and operation from 1.7V to 5.5V VCC and 1.2V to 5.5V VLOGIC. It serves as a precision programmable voltage divider or rheostat in battery-powered instrumentation calibration.

For engineers reviewing the ISL23418WFUZ-TK datasheet, ISL23418WFUZ-TK pinout, ISL23418WFUZ-TK application, or ISL23418WFUZ-TK equivalent, key selection criteria include its 10kΩ resistance option, 10-lead µTQFN package, shutdown mode with RW–RL shorting, mid-scale power-on default, and low 70Ω typical wiper resistance at 3.3V.

Technical Context

The ISL23418WFUZ-TK implements a monolithic CMOS resistor ladder with CMOS wiper switches operating in "make-before-break" mode, controlled via an 8-bit volatile Wiper Register (WR) accessible over SPI Mode 0. Its dual-supply architecture isolates logic-level compatibility (VLOGIC = 1.2V–5.5V) from analog supply (VCC = 1.7V–5.5V), enabling direct interfacing with low-voltage microcontrollers without level shifters.

It supports daisy-chaining of multiple DCPs using SDO-to-SDI cascading, features configurable push-pull or open-drain SDO output via ACR[1], and includes a dedicated shutdown function (ACR[6]) that forces RH–RL open-circuit while internally connecting RW to RL through ~2kΩ - preserving WR contents during shutdown and restoring prior position on exit.

Key Specifications

Pinout & Package

ISL23418WFUZ-TK is housed in a RoHS-compliant 10-lead µTQFN package (PKG DWG L10.2.1x1.6A), measuring 2.1mm × 1.6mm × 0.55mm, with wettable flank leads for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL23418WFUZ-TK, AD5170BRMZ-10 offers nonvolatile storage but larger package and I²C-only interface, while MCP41HV51-103E/MS supports higher voltage rails but sacrifices low-voltage logic compatibility and compact µTQFN footprint.

Availability

ISL23418WFUZ-TK is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, LCD bias calibration, and portable instrument gain adjustment requiring stable component supply across extended temperature ranges.

Supply support for ISL23418WFUZ-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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL23418 product line delivers precision, low-power digitally controlled potentiometers optimized for battery-operated equipment, medical devices, and systems requiring mixed-voltage SPI interfacing and extended temperature reliability.

FAQ

What is the total resistance value of the ISL23418WFUZ-TK?

The ISL23418WFUZ-TK has a nominal total resistance of 10kΩ between RH and RL terminals. This value is confirmed in the Ordering Information table and Analog Specifications section of the FN7901 datasheet, with ±20% tolerance over temperature and process variation. The "W" suffix in the part number explicitly denotes the 10kΩ option.

Does the ISL23418WFUZ-TK retain its wiper position after power cycling?

No, the ISL23418WFUZ-TK uses a volatile Wiper Register (WR) and resets to mid-scale (64-tap position, 40h hex) on every power-up. This behavior is documented in the "Principles of Operation" section and verified in the Memory Description table, where WR defaults to 80h (128 decimal) but actual power-on reset is specified as 40h (64 decimal).

What package type is used for the ISL23418WFUZ-TK?

The ISL23418WFUZ-TK is packaged in a 10-lead µTQFN (2.1mm × 1.6mm) with RoHS-compliant NiPdAu e4 termination, as stated in the Ordering Information table under "PACKAGE" and confirmed by Package Drawing L10.2.1x1.6A. This differs from MSOP variants like ISL23418WFUZ.

Can the ISL23418WFUZ-TK operate with a 1.8V logic supply?

Yes, the ISL23418WFUZ-TK supports VLOGIC from 1.2V to 5.5V, including 1.8V. The Serial Interface Specification confirms VIH ≥ 0.7×VLOGIC and VIL ≤ 0.3×VLOGIC, ensuring reliable communication with 1.8V microcontrollers without external level shifting - a core design feature highlighted in the datasheet introduction.

What is the maximum SPI clock frequency supported by the ISL23418WFUZ-TK?

The ISL23418WFUZ-TK supports up to 5MHz SCK frequency when VLOGIC ≥ 1.7V, as specified in the Serial Interface Specification table. At lower VLOGIC (1.2V–1.6V), the maximum clock rate is reduced to 1MHz to ensure timing margin compliance, per the fSCK parameter definition.