Renesas X9418WS24IT1

Overview

X9418WS24IT1 from Intersil is a dual digitally controlled potentiometer (XDCP™) with 2-wire serial interface, 64-tap resolution per pot, ±2.7V to ±5.5V analog supply range (V+/V−), and 10kΩ end-to-end resistance. It integrates two independent resistor arrays, each with volatile wiper counter registers and four nonvolatile data registers, enabling precise digital adjustment in battery-powered instrumentation and precision analog signal conditioning.

For engineers reviewing the X9418WS24IT1 datasheet, X9418WS24IT1 pinout, X9418WS24IT1 application, or X9418WS24IT1 equivalent, key selection criteria include dual-potentiometer integration, I²C-compatible 2-wire control, nonvolatile storage of up to four wiper positions per channel, low standby current (<1µA), and SOIC-24 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The X9418WS24IT1 implements two 63-segment resistor arrays with CMOS-switched wipers controlled by 6-bit volatile Wiper Counter Registers (WCRs). Each potentiometer supports direct read/write of wiper position and transfer between four 6-bit nonvolatile Data Registers (DR0–DR3) and its WCR, with DR0 automatically loaded at power-up.

It operates as a slave on a 2-wire bus using standard I²C timing (f_SCL ≤ 400 kHz), with device addressing via A0–A3 pins (up to 16 devices per bus). Hardware write protection is enabled via the WP pin, and analog section operation requires separate V+, V− supplies referenced to VSS.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (300-mil), RoHS-compliant, industrial temperature grade (−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 X9418WS24IT1 uniquely delivers dual-pot functionality with true bipolar analog supplies in an I²C-compatible SOIC package-enabling compact, low-power, wide-dynamic-range analog tuning where discrete solutions would increase BOM count and layout complexity.

Availability

X9418WS24IT1 is available at Aetrix Electronics and suitable for instrumentation calibration, programmable gain amplifiers, battery-powered sensor biasing, and comparator hysteresis control requiring stable component supply across industrial temperature ranges.

Supply support for X9418WS24IT1 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 (now part of Renesas Electronics) is a semiconductor manufacturer specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9418 product line was designed for digitally programmable analog signal conditioning in space-constrained, low-power systems requiring nonvolatile calibration storage and bipolar signal support.

FAQ

What is the analog supply voltage range supported by the X9418WS24IT1?

The X9418WS24IT1 supports analog supplies V+ = +2.7V to +5.5V and V− = −5.5V to −2.7V. This bipolar range enables direct interfacing with AC-coupled signals and rail-to-rail analog circuits without external level-shifting components. The digital VCC supply operates independently from 2.7V to 5.5V, allowing mixed-voltage system integration. All potentiometer terminals (VH, VL, VW) must remain within the V− to V+ range.

How many nonvolatile memory locations does the X9418WS24IT1 provide per potentiometer?

The X9418WS24IT1 provides four 6-bit nonvolatile Data Registers (DR0–DR3) for each of its two potentiometers, totaling eight independent storage locations. DR0 is automatically loaded into the corresponding Wiper Counter Register (WCR) at power-up, ensuring repeatable startup conditions. Writes to these registers require a minimum 5ms internal write cycle and are protected by the hardware WP pin when asserted low.

Can the X9418WS24IT1 operate as a two-terminal variable resistor?

Yes, the X9418WS24IT1 can operate as a two-terminal variable resistor by connecting either VH/RH or VL/RL to the circuit common and using VW/RW with the remaining terminal. This configuration is explicitly supported in the datasheet and maintains the same 10kΩ end-to-end resistance and 64-tap resolution. The device retains full nonvolatile storage and 2-wire control functionality in this mode.

What is the maximum clock frequency for the 2-wire interface of the X9418WS24IT1?

The X9418WS24IT1 supports a maximum 2-wire (I²C-compatible) clock frequency of 400 kHz, as specified in its AC timing characteristics. This allows reliable communication with standard microcontrollers and avoids timing violations under recommended operating conditions. The interface complies with standard I²C start/stop, acknowledge, and data hold timing requirements, including tSU:DAT ≥ 100 ns and tHD:DAT ≥ 30 ns.

Is the X9418WS24IT1 pin-compatible with other members of the X9418 family?

Yes, the X9418WS24IT1 shares identical pinout and footprint with all 24-pin SOIC variants of the X9418 family, including X9418WS24IZ-2.7 and X9418WP24I-2.7. Differences between variants relate solely to packaging (Pb-free vs. standard), temperature grade, and marking-never to pin function or electrical interface. This enables drop-in replacement across industrial-grade SOIC versions without PCB redesign.