Renesas ISL23418WFUZ

Overview

ISL23418WFUZ from Renesas Electronics (formerly Intersil) is a volatile, low-voltage, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, 10kΩ end-to-end resistance, ±0.15 LSB INL, 70Ω typical wiper resistance at 3.3V, and operation from -40°C to +125°C. It serves as a precision programmable voltage divider or rheostat in battery-powered instrumentation calibration.

For engineers reviewing the ISL23418WFUZ datasheet, ISL23418WFUZ pinout, ISL23418WFUZ application, or ISL23418WFUZ equivalent, key selection criteria include its 1.2V–5.5V VLOGIC independence, mid-scale power-on preset, shutdown mode with RW-to-RL shorting, and MSOP-10 package compatibility with space-constrained industrial designs.

Technical Context

The ISL23418WFUZ implements a monolithic CMOS resistor ladder with CMOS switch-based wiper control, supporting both voltage divider and rheostat configurations. Its SPI Mode 0 interface operates with rising-edge data input and falling-edge data output, enabling daisy-chaining without additional chip select lines.

It features a volatile 8-bit Wiper Register (WR) that directly controls tap position, with power-on reset to 64 (mid-scale). The Access Control Register (ACR) enables shutdown mode, SDO output configuration, and maintains state during shutdown via internal 2kΩ RW-to-RL connection.

Key Specifications

Pinout & Package

ISL23418WFUZ is packaged in a RoHS-compliant 10-lead MSOP (M10.118), 3mm × 3mm, 0.5mm pitch, with exposed pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP41HV51-103E/SN, the ISL23418WFUZ offers unique VLOGIC/VCC supply separation for ultra-low-voltage MCU compatibility, lower tempco (175ppm/°C vs. 250+ ppm/°C), and optimized settling time (300ns) for dynamic bias control-making it preferred for battery-powered, thermally demanding, and fast-reconfiguration applications.

Availability

ISL23418WFUZ is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, LCD bias tuning, and portable medical calibration requiring stable component supply across extended temperature and low-power operation.

Supply support for ISL23418WFUZ 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 continues to support its precision analog portfolio, including digitally controlled potentiometers and interface ICs for industrial and automotive markets.

The ISL23418WFUZ belongs to the XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in automated calibration, adaptive biasing, and programmable gain/offset circuits where reliability, repeatability, and small footprint are critical.

FAQ

What is the total resistance value of the ISL23418WFUZ?

The ISL23418WFUZ has a nominal end-to-end resistance of 10kΩ, confirmed by the ordering information table in FN7901 Rev 1.00 (Page 3) and specified under Analog Specifications (Page 4, RTOTAL parameter). This value is fixed per device variant and applies across the full operating temperature range of -40°C to +125°C.

Does the ISL23418WFUZ retain wiper position after power cycling?

No, the ISL23418WFUZ uses a volatile Wiper Register and resets to mid-scale (64-tap position, 40h hex) on every power-up, as explicitly stated in the datasheet (Page 1, "When powered on, the ISL23418 wiper always commences at mid-scale"). It does not include non-volatile memory.

Can the ISL23418WFUZ operate with different analog and logic supply voltages?

Yes - the ISL23418WFUZ supports independent supplies: VCC (1.7V–5.5V) for analog operation and VLOGIC (1.2V–5.5V) for SPI interface logic. This allows direct connection to low-voltage microcontrollers without level translation, as detailed in the Features section (Page 1) and Recommended Operating Conditions (Page 4).

What happens to the wiper terminal during shutdown mode of the ISL23418WFUZ?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23418WFUZ forces an open circuit between RH and RL, and internally shorts RW to RL through a ~2kΩ resistor, as shown in Figure 25 (Page 14) and described in the Shutdown Function section. This isolates the high-side path while maintaining a defined low-side reference.

Is the ISL23418WFUZ pin-compatible with other variants in the ISL23418 family?

Yes - all ISL23418 variants (e.g., ISL23418TFUZ, ISL23418UFUZ, ISL23418WFUZ) share identical 10-lead MSOP packaging and pinout, as confirmed by the Pin Configurations diagram (Page 2) and Ordering Information table (Page 3). Only resistance value (10kΩ/50kΩ/100kΩ) and marking differ between variants.