Renesas X9401WS24ZT1

Overview

X9401WS24ZT1 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resistor arrays per channel, SPI serial interface, 10kΩ end-to-end resistance, and nonvolatile wiper position storage. It operates from 2.7V to 5V, draws <3µA in standby, and is used for precision analog trimming in programmable gain amplifiers, voltage regulators, and sensor calibration circuits.

For engineers reviewing the X9401WS24ZT1 datasheet, X9401WS24ZT1 pinout, X9401WS24ZT1 application, or X9401WS24ZT1 equivalent, key selection criteria include SPI-compatible 24-pin SOIC packaging, 150Ω typical wiper resistance, 100-year data retention, four independent nonvolatile data registers per pot, and hardware write-protect (WP) functionality.

Technical Context

The X9401WS24ZT1 implements four independent 63-segment CMOS resistor arrays, each controlled by a 6-bit volatile Wiper Counter Register (WCR) decoded to select one of 64 tap points. Each array supports three-terminal potentiometer or two-terminal variable resistor configurations with VH/RH and VL/RL terminals and VW/RW wiper outputs.

Its SPI interface complies with standard mode-0 timing (CPOL=0, CPHA=0), supports up to 2MHz clock frequency, and includes device addressing via A0/A1 pins for multi-drop bus operation. Hardware features include HOLD for serial pause/resume, WP for nonvolatile write inhibition, and automatic power-up loading of DR0 into the WCR.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil, Pb-free, M24.3 drawing), RoHS compliant, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/P, the X9401WS24ZT1 offers unique quad-SPI integration with hardware HOLD and WP in a 24-pin SOIC, making it optimal for space-constrained industrial controllers requiring simultaneous multi-parameter trimming and robust serial bus management.

Availability

X9401WS24ZT1 is available at Aetrix Electronics and suitable for programmable gain amplifiers, voltage regulator feedback networks, sensor calibration systems, and comparator hysteresis circuits requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9401WS24ZT1 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

Intersil Corporation is a leading provider of precision analog and power management ICs, acquired by Renesas Electronics in 2017. Its products serve industrial, infrastructure, and high-reliability embedded markets.

The X9401WS24ZT1 belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in automated calibration, closed-loop control, and adaptive analog signal conditioning systems.

FAQ

What is the operating voltage range for the X9401WS24ZT1?

The X9401WS24ZT1 operates from 2.7V to 5.5V, supporting both 3.3V and 5V system rails. This range ensures compatibility with common microcontroller I/O levels and analog supply domains. The device guarantees full functionality-including SPI communication, wiper movement, and nonvolatile register access-across this entire voltage span, with ICC1 ≤ 700µA max at 2MHz SCK and VCC = 5V.

Does the X9401WS24ZT1 retain wiper settings after power loss?

Yes, the X9401WS24ZT1 retains wiper settings after power loss via its nonvolatile Data Register 0 (DR0). Upon power-up, the contents of DR0 are automatically loaded into the volatile Wiper Counter Register (WCR), restoring the last-saved wiper position. This behavior eliminates the need for host-initiated reconfiguration and ensures consistent analog behavior across cold starts.

How many independent potentiometers does the X9401WS24ZT1 integrate?

The X9401WS24ZT1 integrates four fully independent digitally controlled potentiometers (XDCPs) on a single monolithic CMOS die. Each pot has its own 64-tap resistor array, dedicated WCR, and four nonvolatile data registers (DR0–DR3), enabling simultaneous, isolated analog adjustments-for example, gain, offset, bandwidth, and threshold in a multi-stage signal chain.

Can the X9401WS24ZT1 be used as a two-terminal variable resistor?

Yes, the X9401WS24ZT1 can be configured as a two-terminal variable resistor by connecting either VH or VL to VW (wiper), leaving the other end open or grounded depending on application. This mode is commonly used in current-limiting, LED brightness control, or RC timing circuits where only adjustable resistance-not voltage division-is required. Wiper resistance remains 150Ω typical in this configuration.

What is the purpose of the HOLD pin on the X9401WS24ZT1?

The HOLD pin on the X9401WS24ZT1 allows pausing an ongoing SPI transaction without resetting the command sequence. When brought LOW while SCK is LOW, it suspends serial communication; bringing it HIGH (with SCK still LOW) resumes from the exact point of interruption. This feature is valuable in multi-master systems or when MCU interrupts must preempt SPI transfers without losing state or requiring retransmission.