Renesas X9C503ST1

Overview

X9C503ST1 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with nonvolatile wiper position storage, 50 kΩ end-to-end resistance, ±20% tolerance, and ±5 V terminal voltage rating. It operates as a three-terminal voltage divider or two-terminal variable resistor in analog signal conditioning, power supply trimming, and sensor calibration circuits.

For engineers reviewing the X9C503ST1 datasheet, X9C503ST1 pinout, X9C503ST1 application, or X9C503ST1 equivalent, key selection criteria include its 100-tap resolution, 750 µA max standby current, 40 Ω typical wiper resistance, -40°C to +85°C industrial temperature range, and compatibility with 5 V ±10% single-supply operation.

Technical Context

The X9C503ST1 uses a 7-bit up/down counter decoded to select one of 100 wiper positions across a temperature-compensated resistor ladder. Its three-wire serial interface (CS, U/D, INC) enables negative-edge-triggered wiper stepping with make-before-break switching to prevent open-circuit transients during position changes.

Wiper position is stored into nonvolatile memory upon CS rising edge while INC is high, and automatically recalled at power-up. An internal charge pump supports ±5 V analog terminal voltages despite a single 5 V VCC supply, though it introduces 20 mVRMS noise at 850 kHz requiring filtering in precision applications.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (M8.15E footprint), RoHS-compliant, narrow-body plastic package with 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP41050-I/P, the X9C503ST1 offers autonomous power-up behavior and lower wiper resistance but lacks multi-channel capability or standardized serial protocols-making it optimal for cost-sensitive, single-pot, self-contained analog trimming tasks.

Availability

X9C503ST1 is available at Aetrix Electronics and suitable for industrial power supply calibration, sensor signal conditioning, audio level control, and comparator hysteresis tuning requiring stable component supply and long-term parameter retention.

Supply support for X9C503ST1 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 manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The X9C503ST1 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in analog circuits where programmability, reliability, and nonvolatile setting retention are required.

FAQ

What is the maximum allowable voltage across the VH/RH and VL/RL terminals for X9C503ST1?

The X9C503ST1 specifies a maximum differential voltage ΔV = |VH/RH − VL/RL| of 10 V. This limit applies regardless of individual terminal voltages, which may range from −5 V to +5 V relative to VSS. Exceeding 10 V risks permanent damage to the internal resistor array or switching network. Always ensure the voltage difference stays within this bound during both static and transient conditions in the X9C503ST1 application circuit.

Does X9C503ST1 require an external clock or data line for communication?

No, the X9C503ST1 uses a self-timed three-wire interface with only CS, U/D, and INC signals-no external clock or serial data line is needed. Wiper movement is controlled by toggling INC on its negative edge while holding U/D steady to define direction. The device internally generates timing for wiper settling and memory store operations, making it compatible with simple GPIO-driven microcontrollers without dedicated serial peripherals.

How does the X9C503ST1 handle power-up and retain its wiper position?

Upon power-up, the X9C503ST1 automatically recalls the last stored wiper position from nonvolatile memory once VCC reaches its final value. The recall is not active during VCC ramp-up; the wiper remains in an undefined state until stabilization. This behavior ensures deterministic startup without glitching. The stored value persists for 100 years, so the X9C503ST1 resumes operation at the exact same resistance ratio after extended power-off periods.

Can X9C503ST1 be used in AC signal paths, and what is its bandwidth limitation?

The X9C503ST1 is rated for DC and low-frequency analog use only. Its potentiometer capacitances (CH/CL/CW = 10/10/25 pF) and 40 Ω wiper resistance form RC filters that roll off response above ~100 kHz. Additionally, charge pump noise at 850 kHz (20 mVRMS) couples into the analog terminals. For AC signal paths, the X9C503ST1 is suitable up to ~10 kHz with proper bypassing; higher frequencies require dedicated analog switches or digital potentiometers with specified AC performance.

What is the endurance rating of the nonvolatile memory in X9C503ST1?

The X9C503ST1 guarantees 100,000 data changes per bit in its nonvolatile memory. Each store operation (CS rising edge with INC HIGH) counts as one write cycle. This endurance supports decades of field recalibration-even with daily adjustments, the X9C503ST1 exceeds 27 years of service before reaching end-of-life. Memory retention remains valid for 100 years after the final write, ensuring long-term reliability in unattended equipment.