Renesas X9315WP

Overview

X9315WP from Intersil is a digitally controlled potentiometer (XDCP™) implementing a 31-element resistor array with 32 discrete wiper tap positions, nonvolatile wiper position storage, and 3-wire serial interface (CS/U/D/INC). It operates as a three-terminal voltage divider or two-terminal variable resistor at VCC = 5V ±10%, supports 0°C to +70°C operation, and delivers low-noise performance (–120 dBV @ 1 kHz) for analog signal trimming in precision instrumentation.

For engineers reviewing the X9315WP datasheet, X9315WP pinout, X9315WP application, or X9315WP equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternatives, and supply-chain support for production deployment.

Technical Context

The X9315WP uses a 5-bit up/down counter driving a 32-position decoder to select one of 32 wiper taps across a monolithic 31-resistor ladder. Wiper movement follows make-before-break switching to prevent open-circuit transients during position changes.

Nonvolatile memory stores the last wiper position upon CS↑ with INC = HIGH, enabling automatic recall at power-up. Terminal voltages are bounded by VSS and VCC, and wiper resistance is 200 Ω (typ.) at VCC = 5V - critical for minimizing loading error in high-impedance feedback paths.

Key Specifications

Pinout & Package

Package: 8-pin PDIP (Plastic Dual-In-Line), 0.300" wide, MDP0031 footprint - compatible with through-hole prototyping and legacy industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ10 and MCP41010-I/P, the X9315WP offers native power-up recall without host intervention, simpler 3-wire control (no protocol overhead), and proven reliability in industrial analog trimming - making it optimal for self-contained, low-complexity calibration tasks.

Availability

X9315WP is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor conditioning, and legacy embedded control systems requiring stable component supply, long-lifecycle availability, and through-hole manufacturability.

Supply support for X9315WP 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 focused on power management, precision analog, and interface solutions for industrial, computing, and communications markets.

The X9315WP belongs to the XDCP™ family of digitally controlled potentiometers engineered for replacing mechanical trimmers in analog signal-path calibration - emphasizing reliability, nonvolatile retention, and low-noise operation in unattended systems.

FAQ

What is the operating temperature range for the X9315WP?

The X9315WP is rated for 0°C to +70°C (commercial grade). Its resistor array features ±300 ppm/°C total resistance temperature coefficient and ±20 ppm/°C ratiometric coefficient, ensuring stable voltage division across this range. This makes the X9315WP suitable for indoor industrial controls and consumer-grade test equipment where ambient extremes are limited.

Does the X9315WP retain its wiper position after power loss?

Yes, the X9315WP stores the wiper position in nonvolatile memory. When CS transitions HIGH while INC is HIGH, the current counter value is written to EEPROM. Upon subsequent power-up, that stored value is automatically recalled and applied to the wiper - no external controller or initialization sequence is required. This behavior is intrinsic to the X9315WP and does not depend on external circuitry.

Can the X9315WP be used as a two-terminal variable resistor?

Yes, the X9315WP supports two-terminal operation by connecting either RH/VH or RL/VL to the wiper RW/VW, leaving the unused terminal open. In this configuration, it functions as a digitally adjustable rheostat with 32 discrete resistance values ranging from near-zero (wiper at same terminal) to RTOTAL (wiper at opposite terminal). The 200 Ω typical wiper resistance must be included in total path calculations.

What is the maximum voltage allowed across RH/VH and RL/VL terminals?

The absolute maximum voltage difference ΔV = |VH – VL| is 5 V. Additionally, both VH and VL must remain within –1 V to +7 V relative to VSS, and VCC must always be ≥ VH, VL, and VW. These constraints ensure safe operation of the internal CMOS switches and resistor array - exceeding them risks latch-up or permanent damage to the X9315WP.

How does the X9315WP handle rapid wiper position changes?

The X9315WP uses make-before-break switching: when the wiper moves multiple positions, intermediate taps are briefly connected before the final position settles. This prevents open-circuit transients but may temporarily reduce effective RTOTAL. The INC-to-VW change time (tIW) is 1–5 µs, and minimum INC cycle time (tCYC) is 4 µs - limiting maximum update rate to ~250 kHz for single-step moves.