Renesas X9318WS8Z

Overview

X9318WS8Z from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 10 kΩ end-to-end resistance solid-state resistor array with 100 wiper tap points, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It operates from 4.5 V to 5.5 V, supports terminal voltages up to +8 V, and is used for precision DC bias adjustment in analog signal chains.

For engineers reviewing the X9318WS8Z datasheet, X9318WS8Z pinout, X9318WS8Z application, or X9318WS8Z equivalent, this page delivers verified specifications, SOIC-8 package mapping, wiper control timing behavior, temperature-compensated linearity, and RoHS-compliant Pb-free construction details essential for trim circuit design and long-term calibration retention.

Technical Context

The X9318WS8Z integrates a 99-element resistor ladder with "make-before-break" electronic wiper switching, a 7-bit up/down counter, and EEPROM-based nonvolatile memory for wiper position recall on power-up. Its control logic responds to negative-edge-triggered INC pulses synchronized with U/D direction and CS enable.

It exhibits ±300 ppm/°C RTOTAL temperature coefficient and ±20 ppm/°C ratiometric temperature coefficient, enabling stable voltage divider operation across 0°C to 70°C. Wiper resistance is 40 Ω typical, and absolute linearity is ±1% over all 100 taps - confirmed under V(RH) = 8 V, V(RL) = 0 V conditions.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil), RoHS-compliant Pb-free termination (annealed matte tin), JEDEC MS-012AC compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9318WS8Z, AD5243BRMZ10 offers dual-channel I²C control but sacrifices guaranteed power-up position recall and introduces protocol overhead, while MCP41010-I/P provides finer 256-step resolution yet mandates host-driven initialization - making X9318WS8Z optimal for simple, self-contained, calibration-critical analog trim where deterministic startup behavior is mandatory.

Availability

X9318WS8Z is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias adjustment, and voltage regulator output trimming requiring stable component supply, long-term calibration retention, and commercial-temperature-grade reliability.

Supply support for X9318WS8Z 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) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X9318 product line delivers digitally programmable analog trim components optimized for calibration-critical applications where nonvolatile setting retention, temperature-stable linearity, and minimal external component count are essential.

FAQ

What is the maximum allowable voltage across RH and RL terminals for the X9318WS8Z?

The X9318WS8Z supports a terminal voltage range of 0 V to +8 V across RH and RL, referenced to VSS. This allows use in bias networks where headroom exceeds standard 5 V rails - such as laser diode drivers or high-voltage LCD VCOM stages. Exceeding +8 V risks permanent damage per absolute maximum ratings.

Does the X9318WS8Z retain its wiper position after power cycling?

Yes, the X9318WS8Z stores the wiper position in nonvolatile EEPROM memory. Upon power-up, it automatically recalls the last stored tap value (0–99), ensuring repeatable analog settings without host intervention. Data retention is rated for 100 years under normal operating conditions.

What is the wiper resistance specification for the X9318WS8Z, and how does it affect circuit performance?

The X9318WS8Z has a typical wiper resistance of 40 Ω, with a maximum of 200 Ω. This series resistance impacts gain accuracy in op-amp feedback networks and introduces small voltage errors in high-impedance divider configurations. For precision applications, designers should verify that 40 Ω contributes negligible error relative to total RTOTAL (10 kΩ) and load impedance.

Can the X9318WS8Z be used in a two-terminal variable resistor configuration?

Yes, the X9318WS8Z supports both three-terminal potentiometer (RH–RW–RL) and two-terminal variable resistor (e.g., RW–RL or RW–RH) modes. In two-terminal mode, it functions as a digitally adjustable resistance element - commonly used for gain-setting or current-limiting where only one end of the array is actively driven.

Is the X9318WS8Z RoHS compliant, and what does the 'Z' suffix indicate?

Yes, the X9318WS8Z is RoHS compliant. The 'Z' suffix explicitly denotes Pb-free plus anneal construction: 100% matte tin termination, RoHS-compliant molding compounds, and compatibility with both SnPb and lead-free solder reflow profiles per IPC/JEDEC J-STD-020.