Renesas X9418WS24IZ-2.7

Overview

X9418WS24IZ-2.7 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire I²C-compatible interface, 64-tap resolution per pot, ±2.7V to ±5.5V analog supply range, and 24-pin SOIC (300-mil) RoHS-compliant package. It functions as two independent 2.5kΩ or 10kΩ variable resistors in one IC for precision analog control in battery-powered instrumentation.

For engineers reviewing the X9418WS24IZ-2.7 datasheet, X9418WS24IZ-2.7 pinout, X9418WS24IZ-2.7 application, or X9418WS24IZ-2.7 equivalent, key selection criteria include dual-pot nonvolatile storage (four 6-bit registers per channel), hardware write protection (WP pin), industrial temperature range (–40°C to +85°C), and low standby current (<1µA).

Technical Context

The X9418WS24IZ-2.7 integrates two monolithic CMOS resistor arrays-each with 63 segments and 64 tap points-controlled by independent 6-bit volatile Wiper Counter Registers (WCRs) and four nonvolatile Data Registers (DR0–DR3) per channel. Its 2-wire serial interface supports direct read/write of wiper position, register transfer, and increment/decrement operations with acknowledge polling.

It operates with split analog supplies (V+ = +2.7V to +5.5V, V– = –2.7V to –5.5V) and a single system supply (VCC = 2.7V to 5.5V), enabling true bipolar signal conditioning. Power-up automatically loads DR0 into each WCR, and hardware write protection via the WP pin prevents unintended EEPROM writes.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300-mil), RoHS-compliant, Pb-free plus anneal finish (MDP0044 drawing).

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 X9418WS24IZ-2.7 uniquely supports true bipolar analog signal conditioning via dedicated V+/V– pins, making it irreplaceable in applications requiring rail-to-rail AC coupling or negative feedback networks without level shifters.

Availability

X9418WS24IZ-2.7 is available at Aetrix Electronics and suitable for industrial control systems, portable test equipment, and battery-powered sensor interfaces requiring stable component supply, long-term calibration retention, and RoHS-compliant packaging.

Supply support for X9418WS24IZ-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 (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for industrial, communications, and computing markets.

The X9418 product line delivers digitally controlled potentiometers optimized for precision analog trimming, calibration, and programmable gain control in harsh environments with extended temperature and reliability requirements.

FAQ

What is the absolute maximum voltage rating for the V+ and V– pins of the X9418WS24IZ-2.7?

The X9418WS24IZ-2.7 specifies absolute maximum ratings of +10V on V+ and –10V on V–, with a maximum differential of 12V between them. Exceeding these limits risks permanent damage. The recommended operating range remains ±2.7V to ±5.5V. Always ensure V+ and V– ramp rates comply with tRVCC (0.2–50 V/msec) during power-up to prevent latch-up.

Does the X9418WS24IZ-2.7 support true 2-wire I²C communication including ACK polling?

Yes, the X9418WS24IZ-2.7 implements full I²C-compatible 2-wire protocol with start/stop conditions, 7-bit addressing (0101xxxx), and ACK polling during nonvolatile writes. After issuing a write command, the host can repeatedly send START + slave address; the device responds with ACK only after the internal 5–10ms EEPROM cycle completes. This enables deterministic timing without fixed delays.

How does the X9418WS24IZ-2.7 handle power-up wiper initialization, and can it be overridden?

On power-up, the X9418WS24IZ-2.7 automatically loads the contents of DR0 into each Wiper Counter Register (WCR), restoring the last saved position. This behavior cannot be disabled. To set a different initial value, write the desired wiper position to DR0 before power-down, or issue a "Write WCR" command immediately after power stabilization (tPUW = 5ms min).

What is the wiper resistance specification for the X9418WS24IZ-2.7, and how does it vary with supply voltage?

The X9418WS24IZ-2.7 specifies wiper resistance (RW) as 150–250Ω at ±3V analog supplies and 40–100Ω at ±5V. This voltage-dependent variation results from CMOS switch on-resistance scaling. For precision applications, designers should account for RW in total end-to-end resistance tolerance (±20%) and verify voltage drop across RW under max wiper current (±3mA).

Can the X9418WS24IZ-2.7 be used in a single-supply configuration, and what are the limitations?

Yes - configure V– = VSS (0V), V+ = VCC (2.7V–5.5V), and use only positive-side terminals (VHx, VLx, VWx). However, this eliminates true bipolar operation: the wiper output becomes unidirectional (0V to VCC), and analog signal swing is limited to 0–VCC. Applications requiring negative voltages or AC-coupled signals must retain split supplies.