Renesas X9401WS24IZ-2.7

Overview

X9401WS24IZ-2.7 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resistor arrays per channel, SPI serial interface, 10 kΩ end-to-end resistance, and 2.7 V to 5.5 V supply operation - used for precision analog trimming in voltage regulators, amplifier gain control, and offset adjustment circuits.

For engineers reviewing the X9401WS24IZ-2.7 datasheet, X9401WS24IZ-2.7 pinout, X9401WS24IZ-2.7 application, or X9401WS24IZ-2.7 equivalent, this page delivers verified electrical specs, SOIC-24 package mapping, wiper position persistence behavior, nonvolatile register architecture, and real-world configuration examples - all confirmed against FN8190 Rev 5.00.

Technical Context

The X9401WS24IZ-2.7 implements four independent 64-element CMOS resistor arrays, each with volatile Wiper Counter Registers (WCR) and four 6-bit nonvolatile Data Registers (DR0–DR3). Wiper position is set via SPI commands including Write/Read WCR, XFR DR↔WCR, and Increment/Decrement modes.

It supports hardware write protection (WP), HOLD for serial pause, and dual-device addressing (A0/A1) enabling up to four devices on one SPI bus. Power-up automatically loads DR0 into each WCR, ensuring repeatable startup wiper positions without host initialization.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), Pb-free, RoHS-compliant (Package Drawing M24.3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP42050-I/P, the X9401WS24IZ-2.7 uniquely combines SPI compatibility, hardware write protection, automatic DR0 power-up restore, and quad 64-tap arrays in a single SOIC-24 package - making it optimal for industrial systems requiring tamper-resistant, self-initializing analog trimming.

Availability

X9401WS24IZ-2.7 is available at Aetrix Electronics and suitable for voltage regulator trimming, programmable gain amplification, comparator hysteresis setting, and audio channel balancing requiring stable component supply across industrial temperature ranges and long-lifecycle deployments.

Supply support for X9401WS24IZ-2.7 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 leader in precision analog and power management ICs, delivering high-reliability solutions for industrial, infrastructure, and high-end consumer markets.

The X9401WS24IZ-2.7 belongs to Intersil's XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in automated test equipment, medical instrumentation, and programmable power supplies where repeatability and nonvolatile calibration are essential.

FAQ

What is the power-up behavior of the X9401WS24IZ-2.7?

At power-up, the X9401WS24IZ-2.7 automatically loads the contents of Data Register 0 (DR0) for each potentiometer into its corresponding volatile Wiper Counter Register (WCR). This ensures repeatable wiper positions without host intervention. The X9401WS24IZ-2.7 does not retain WCR values across power cycles unless explicitly stored to DR0 beforehand.

Does the X9401WS24IZ-2.7 support true three-wire SPI operation?

Yes, the X9401WS24IZ-2.7 supports true three-wire SPI: SI and SO are separately buffered and can be tied together with an external pull-up for single-data-line operation. CS, SCK, and the combined SI/SO line form a functional 3-wire interface - reducing MCU pin count while maintaining full read/write capability for the X9401WS24IZ-2.7.

How does hardware write protection (WP) function on the X9401WS24IZ-2.7?

When the WP pin of the X9401WS24IZ-2.7 is driven LOW, all nonvolatile write operations - including transfers from WCR to DR and direct DR writes - are blocked. This prevents accidental overwriting of calibrated settings during firmware updates or transient noise events. WP has no effect on volatile WCR writes or read operations.

Can the X9401WS24IZ-2.7 be used as a two-terminal variable resistor?

Yes, the X9401WS24IZ-2.7 can operate as a two-terminal variable resistor by connecting either VH or VL to VW and using the remaining terminal with the wiper. This configuration achieves resistance ranging from near-0 Ω (wiper at connected end) to RTOTAL (wiper at opposite end), with wiper resistance contributing to minimum on-resistance - confirmed in the X9401WS24IZ-2.7 datasheet under Analog Specifications.

What is the maximum clock frequency supported by the X9401WS24IZ-2.7 SPI interface?

The X9401WS24IZ-2.7 supports a maximum SPI clock frequency of 2 MHz, as specified in the AC Timing table of FN8190 Rev 5.00. At this rate, the minimum clock cycle time is 500 ns, with setup/hold times of 50 ns for SI, SCK, CS, and HOLD. Exceeding 2 MHz may cause command corruption or incomplete register transfers in the X9401WS24IZ-2.7.