Renesas X9C503ST2

Overview

X9C503ST2 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with nonvolatile wiper position storage, 50kΩ end-to-end resistance, ±20% tolerance, and three-wire serial interface (CS/U/D/INC). It operates at 5V ±10%, supports ±5V terminal voltages, and serves as a solid-state replacement for mechanical potentiometers in precision analog trimming and calibration circuits.

For engineers reviewing the X9C503ST2 datasheet, X9C503ST2 pinout, X9C503ST2 application, or X9C503ST2 equivalent, this page delivers verified specifications, validated pin functions, confirmed SOIC-8 package mapping, real-world use cases in voltage reference adjustment and sensor offset calibration, and two technically documented alternative parts with explicit functional and parametric distinctions.

Technical Context

The X9C503ST2 integrates a 7-bit up/down counter, nonvolatile memory for wiper position retention, and a 100-tap decoder driving make-before-break electronic switches across a temperature-compensated 99-resistor array. Its control logic responds to negative-edge-triggered INC pulses while U/D sets direction and CS enables selection and nonvolatile store operations.

It features CMOS-compatible 5V operation with active current ≤3mA and standby current ≤750µA, wiper resistance of 40Ω typical, absolute linearity ±1 MI, and ratiometric temperature coefficient ±20 ppm/°C - enabling stable performance in analog signal conditioning without external biasing or calibration.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, surface-mount, 3.90 mm × 4.90 mm footprint 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 X9C503ST2 uniquely combines single-channel 50kΩ resistance, nonvolatile wiper storage, and minimal three-wire control - making it optimal for cost-sensitive, self-contained analog calibration where reliability across power cycles is essential and bus overhead must be minimized.

Availability

X9C503ST2 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply trimming, and embedded audio level control requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.

Supply support for X9C503ST2 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 connectivity solutions for industrial, automotive, and enterprise applications.

The X9C503ST2 belongs to Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in analog signal-path calibration where nonvolatile setting retention, temperature stability, and minimal digital interface overhead are critical.

FAQ

What is the end-to-end resistance tolerance and temperature coefficient of the X9C503ST2?

The X9C503ST2 has an end-to-end resistance of 50kΩ with a tolerance of ±20%. Its RTOTAL temperature coefficient is ±300 ppm/°C over the industrial temperature range (−40°C to +85°C), ensuring stable resistance ratio performance in varying thermal environments. This specification is explicitly confirmed in the FN8222 Rev 4.00 datasheet, Table "Electrical Specifications" under "RTOTAL Temperature Coefficient" for X9C503.

Does the X9C503ST2 retain its wiper position after power cycling?

Yes, the X9C503ST2 stores the wiper position in nonvolatile memory and automatically recalls it upon power-up. This behavior is guaranteed by its integrated EEPROM-like storage, rated for 100 years of data retention and 100,000 write cycles. The recall occurs once VCC reaches its final value, as specified in the "Power-up and Down Requirements" section of the FN8222 datasheet.

What package type and footprint does the X9C503ST2 use?

The X9C503ST2 is supplied in an 8-lead narrow-body SOIC package conforming to outline drawing M8.15E, with dimensions 3.90 mm × 4.90 mm and 1.27 mm lead pitch. This RoHS-compliant surface-mount package is verified in the "Package Outline Drawings" section (Page 10) of the FN8222 datasheet and matches ordering codes ending in "S" (e.g., X9C503SZ, X9C503SIZ).

Can the X9C503ST2 operate with bipolar analog signals?

Yes, the X9C503ST2 supports terminal voltages from −5V to +5V relative to VSS, enabled by its internal charge pump. This allows direct use in bipolar signal paths - such as op-amp inputs or sensor bridges - without external level-shifting circuitry. The ±5V rating is specified in the "Electrical Specifications" table under "VVH/RH" and "VVL/RL" in the FN8222 datasheet.

How many wiper positions does the X9C503ST2 provide, and what is its resolution?

The X9C503ST2 provides 100 discrete wiper positions (0 through 99), corresponding to 1% resolution across its 50kΩ end-to-end resistance. Each step equals RTOTAL/99 ≈ 505Ω, defined as the Minimum Increment (MI) in the datasheet. This resolution is confirmed in the "Features" section ("100 Wiper Tap Points") and "Electrical Specifications" table ("Resolution: 1%").