Renesas X9317WM8IZ

Overview

X9317WM8IZ from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap positions, nonvolatile wiper position storage, and 3-wire up/down serial interface. It operates from 2.7V to 5.5V, offers 10kΩ end-to-end resistance, ±20% tolerance, and functions as either a three-terminal voltage divider or two-terminal variable resistor in precision analog trimming applications.

For engineers reviewing the X9317WM8IZ datasheet, X9317WM8IZ pinout, X9317WM8IZ application, or X9317WM8IZ equivalent, key selection considerations include industrial temperature range (-40°C to +85°C), MSOP-8 package, nonvolatile recall on power-up, low standby current (<5µA), and wiper resistance of 200Ω (typ) at 5V.

Technical Context

The X9317WM8IZ uses a 7-bit up/down counter decoded to select one of 100 wiper positions across a linear resistor ladder. Its control logic responds to CS (chip select), U/D (direction), and edge-triggered INC inputs, enabling deterministic wiper movement without wraparound.

Wiper position is stored in nonvolatile memory upon CS rising edge while INC is high, ensuring automatic restoration at next power-up. The device employs make-before-break switching during wiper transitions and features temperature-compensated resistive elements with ±300 ppm/°C total resistance TC and ±20 ppm/°C ratiometric TC.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (M8.118), RoHS-compliant, moisture sensitivity level (MSL) 1, thermal resistance θ_JA = 145°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP41HV51-103E/MS, the X9317WM8IZ provides deterministic, low-pin-count up/down control ideal for resource-constrained MCUs, retains industrial-grade temperature performance, and eliminates protocol translation overhead - making it optimal for cost-sensitive, analog-trim-focused designs.

Availability

X9317WM8IZ is available at Aetrix Electronics and suitable for LCD bias control, laser diode bias adjustment, voltage regulator output trimming, and DC offset calibration requiring stable component supply across industrial temperature ranges.

Supply support for X9317WM8IZ 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT applications.

The X9317 product line delivers solid-state digital potentiometers optimized for precision analog trimming in industrial and communications equipment, emphasizing nonvolatile retention, low power, and robust temperature performance.

FAQ

What is the guaranteed wiper resistance specification for X9317WM8IZ at 2.7V supply?

The X9317WM8IZ has a maximum wiper resistance of 1000Ω when operated at 2.7V supply, as specified in the Potentiometer Specifications table on page 4 of FN8183 Rev.10.01. This value directly impacts insertion loss in two-terminal variable resistor configurations and must be accounted for in current-sense feedback paths. At 5V, the max wiper resistance is 400Ω. The X9317WM8IZ datasheet confirms this parameter is tested across the full -40°C to +85°C temperature range.

Does X9317WM8IZ support true 3-wire interface without requiring a clock or data line?

Yes, the X9317WM8IZ implements a true 3-wire up/down interface using only CS, U/D, and INC pins - no clock or bidirectional data line is required. The INC input is negative-edge-triggered, and wiper movement direction is determined solely by the logic level on U/D during the INC transition. This architecture reduces MCU GPIO usage and eliminates timing-critical clock synchronization. The X9317WM8IZ functional description on page 1 explicitly confirms this interface simplicity.

How does the nonvolatile store operation work on X9317WM8IZ?

The X9317WM8IZ stores the current wiper position in nonvolatile memory when CS transitions from low to high while the INC input is held high. This store cycle takes 5–10 ms to complete, after which the device enters standby mode. Upon subsequent power-up, the stored value is automatically recalled to set the wiper position. The X9317WM8IZ datasheet specifies 100,000 write cycles and 100-year data retention under industrial conditions.

Is X9317WM8IZ pin-compatible with other members of the X9317 family in MSOP-8 packages?

Yes, all X9317 variants in the 8-lead MSOP package - including X9317WM8Z, X9317WM8IZ, and X9317WM8IZ-2.7 - share identical pinout, footprint, and land pattern per M8.118 drawing. Differences are limited to supply voltage range (2.7–5.5V vs. 4.5–5.5V), temperature grade (-40°C to +85°C vs. 0°C to +70°C), and part marking. The X9317WM8IZ pin configuration diagram on page 3 confirms full mechanical and electrical compatibility within the MSOP-8 group.

What is the maximum allowable wiper current for X9317WM8IZ, and how is it calculated?

The X9317WM8IZ specifies a maximum wiper current (IW) of ±4.4mA, defined as the current flowing through the wiper terminal RW between RH and RL. It is calculated as IW = [V(RH) − V(RL)] / RTOTAL. For a 10kΩ device with 5V across RH–RL, max current is 0.5mA - well within limit. Exceeding ±4.4mA risks permanent damage. The X9317WM8IZ Absolute Maximum Ratings table on page 4 explicitly lists this value as a hard limit.