Renesas X9401WS24Z

Overview

X9401WS24Z from Intersil is a quad-channel, 64-tap digitally controlled potentiometer (XDCP™) with SPI interface, 10 kΩ end-to-end resistance, 150 Ω typical wiper resistance, and nonvolatile data registers for each pot. It operates from 2.7 V to 5.5 V and delivers <3 µA standby current, enabling precision analog tuning in low-power embedded control and signal conditioning circuits.

For engineers reviewing the X9401WS24Z datasheet, X9401WS24Z pinout, X9401WS24Z application, or X9401WS24Z equivalent, this page provides verified technical context, validated pin functions, confirmed SPI timing and register behavior, and real-world use cases for voltage divider, variable gain, offset adjustment, and programmable filter design.

Technical Context

The X9401WS24Z implements four independent 63-segment resistor arrays, each controlled by a volatile 6-bit Wiper Counter Register (WCR) and backed by four 6-bit nonvolatile Data Registers (DR0–DR3). Wiper position is updated via SPI commands including Write/Read WCR, Write/Read DR, XFR between DR and WCR, and real-time Increment/Decrement mode.

It supports full SPI bus operation with CS, SCK, SI, and SO pins, device addressing via A0/A1 (up to 4 devices), hardware write protection (WP), and serial hold (HOLD) for pause/resume. Power-up automatically loads DR0 into each WCR, ensuring repeatable startup wiper positions.

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 X9401WS24Z, AD5204BRUZ10 offers finer resolution but sacrifices SPI compatibility and hardware write protection, while MCP42010-I/P reduces channel count and eliminates nonvolatile register storage - making X9401WS24Z uniquely suited for robust, quad-channel, field-calibratable analog systems.

Availability

X9401WS24Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, and embedded audio level control requiring stable component supply across long-lifecycle production programs.

Supply support for X9401WS24Z 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 precision analog and power management semiconductor provider, now part of Renesas Electronics, delivering high-reliability solutions for industrial, infrastructure, and computing markets.

The X9401 product line was engineered for digitally reconfigurable analog signal conditioning - targeting applications where mechanical potentiometer replacement, calibration traceability, and nonvolatile setting retention are mandatory.

FAQ

What is the operating voltage range for the X9401WS24Z?

The X9401WS24Z operates from 2.7 V to 5.5 V, supporting both 3.3 V and 5 V logic systems. This extended V_CC range ensures compatibility with mixed-voltage designs and maintains full functionality-including SPI communication, wiper movement, and nonvolatile register writes-across the entire span. The X9401WS24Z datasheet specifies no derating or parameter degradation within this window.

Does the X9401WS24Z retain wiper position after power cycling?

Yes - the X9401WS24Z automatically loads the contents of Data Register 0 (DR0) into each Wiper Counter Register (WCR) at power-up. Since DR0 is nonvolatile and retains its value for 100 years, the wiper position is restored deterministically. To preserve the last-used setting, the host must explicitly write the current WCR value to DR0 before power-down.

How many devices can share the same SPI bus with the X9401WS24Z?

Up to four X9401WS24Z devices can coexist on a single SPI bus using the A0 and A1 address pins to configure unique 2-bit slave addresses. Each device responds only when its address matches the two LSBs of the 8-bit ID byte sent by the host. No external address decoding logic is required.

What is the purpose of the HOLD pin on the X9401WS24Z?

The HOLD pin on the X9401WS24Z allows pausing an active SPI transaction without aborting or resetting the command sequence. When brought LOW while SCK is LOW, it freezes communication; bringing it HIGH (again with SCK LOW) resumes exactly where it left off. This feature is used in multi-master systems or when the host must temporarily service higher-priority interrupts.

Can the X9401WS24Z be used as a two-terminal variable resistor?

Yes - the X9401WS24Z supports two-terminal operation by connecting either VH or VL to VW (wiper), effectively using only one half of the resistor array. In this mode, resistance varies from near-zero (WCR = 0 or 63) to full RTOTAL (10 kΩ), with wiper resistance (150 Ω typical) contributing minimally to total error. This configuration is commonly used in current-limiting and LED brightness control.