Renesas X9401WV24ZT1

Overview

X9401WV24ZT1 from Intersil is a quad digitally controlled potentiometer (XDCP™) with 64-tap resistor arrays per channel, SPI interface, nonvolatile data registers, and 10 kΩ end-to-end resistance. It operates from 2.7 V to 5 V, draws <3 µA in standby, and is used for precision analog trimming, gain/offset adjustment, and programmable biasing in industrial sensor interfaces and power supply feedback loops.

For engineers reviewing the X9401WV24ZT1 datasheet, X9401WV24ZT1 pinout, X9401WV24ZT1 application, or X9401WV24ZT1 equivalent, key selection criteria include SPI-compatible 24-pin TSSOP packaging, 150 Ω typical wiper resistance, 100-year data retention, four independent nonvolatile data registers per pot, and hardware write protection via WP pin.

Technical Context

The X9401WV24ZT1 implements four independent 63-segment CMOS resistor arrays, each controlled by a volatile 6-bit 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, VL/RL, and VW/RW terminals.

It uses standard SPI protocol with CS, SCK, SI, and SO pins, supports device addressing via A0/A1 (up to 4 devices on bus), and includes HOLD for serial communication pause. Nonvolatile writes to data registers require CS high-to-low transition and complete within 10 ms, with WIP bit monitoring.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm wide), RoHS-compliant, Pb-free (MDP0044 drawing).

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/SL, the X9401WV24ZT1 uniquely combines hardware write protection, HOLD functionality, and 100-year data retention in a 24-pin TSSOP-making it optimal for industrial calibration systems requiring tamper-resistant, long-life analog trimming.

Availability

X9401WV24ZT1 is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supplies, audio channel balancing, and medical instrument offset nulling requiring stable component supply and long-term calibration integrity.

Supply support for X9401WV24ZT1 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 provider of precision analog and power management solutions, now part of Renesas Electronics, with focus on industrial, infrastructure, and high-reliability applications.

The X9401 product line was designed for digitally programmable analog trimming in systems requiring nonvolatile calibration storage, SPI compatibility, and robust operation across –40°C to +85°C.

FAQ

What is the operating voltage range for the X9401WV24ZT1?

The X9401WV24ZT1 operates from 2.7 V to 5 V, supporting both 3.3 V and 5 V logic systems without level translation. This range is validated across the full industrial temperature range (–40°C to +85°C), and VCC must always be ≥ VH, VL, and VW to prevent latch-up. The X9401WV24ZT1 datasheet specifies absolute maximum VCC at 5 V ±10%, with no restrictions on power-up sequencing relative to analog pin voltages.

How does the hardware write protect (WP) pin function on the X9401WV24ZT1?

When the WP pin is driven LOW, the X9401WV24ZT1 blocks all nonvolatile writes to its four data registers (DR0–DR3), preventing accidental overwrites of calibrated values during firmware updates or system resets. WP has no effect on volatile WCR operations or SPI read commands. The X9401WV24ZT1 requires WP to be HIGH to execute Write Data Register, XFR, or Global XFR instructions-ensuring intentional calibration changes only.

Can the X9401WV24ZT1 be used as a two-terminal variable resistor?

Yes, the X9401WV24ZT1 supports two-terminal variable resistor mode by connecting either VH or VL to VW (wiper), leaving the other end open. In this configuration, resistance varies from near-zero (wiper at connected terminal) to RTOTAL (wiper at opposite terminal). The X9401WV24ZT1 maintains 150 Ω typical wiper resistance and 1.6% resolution in this mode, making it suitable for current-limiting or programmable load applications.

What is the purpose of the HOLD pin on the X9401WV24ZT1?

The HOLD pin allows pausing an active SPI transaction without aborting or resetting the command sequence. To pause, HOLD must go LOW while SCK is LOW; to resume, HOLD returns HIGH-also while SCK is LOW. This feature preserves state during interrupt servicing or bus arbitration. The X9401WV24ZT1 ignores HOLD if SCK is HIGH, and HOLD should be held HIGH when unused. It is distinct from CS and does not affect power state.

How many nonvolatile data registers does the X9401WV24ZT1 have per potentiometer?

The X9401WV24ZT1 has four nonvolatile 6-bit data registers (DR0–DR3) per potentiometer, totaling 16 registers across its quad architecture. DR0 is automatically loaded into the volatile Wiper Counter Register (WCR) at power-up, enabling repeatable startup states. Each register supports independent read/write and transfer to/from WCR, with internal write cycles completing in ≤10 ms and retaining data for 100 years.