Renesas X9C102ST2

Overview

X9C102ST2 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap points, ±20% end-to-end resistance tolerance, nonvolatile wiper position storage, and 5V CMOS operation. It functions as a solid-state three-terminal potentiometer or two-terminal variable resistor in precision analog trimming applications such as DC offset calibration and sensor gain adjustment.

For engineers reviewing the X9C102ST2 datasheet, X9C102ST2 pinout, X9C102ST2 application, or X9C102ST2 equivalent, key selection criteria include its 1kΩ end-to-end resistance, -5V to +5V terminal voltage range, 40Ω typical wiper resistance, 750µA max standby current, and compatibility with 3-wire serial interface timing requirements including 2µs INC cycle time and 100ns CS-to-INC setup.

Technical Context

The X9C102ST2 integrates a 7-bit up/down counter, nonvolatile memory for wiper position retention, and a make-before-break wiper switching network across 99 resistive elements. Its internal charge pump enables ±5V analog terminal operation while powered solely from a 5V supply.

Wiper movement is controlled via negative-edge-triggered INC input synchronized with U/D direction logic and CS chip select; store-to-nonvolatile-memory occurs on CS rising edge with INC high. The device supports both commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature ranges depending on package variant.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (M8.15E footprint), RoHS-compliant, narrow-body plastic package with 1.27mm lead pitch and 5.00mm × 4.00mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5201BRMZ-10 and MCP41010-I/P, the X9C102ST2 provides guaranteed power-on wiper recall without host intervention, tighter analog voltage range control (±5V), and simpler 3-wire interface - making it optimal for standalone analog trimming where reliability and initialization autonomy are critical.

Availability

X9C102ST2 is available at Aetrix Electronics and suitable for precision analog trimming, sensor calibration, and DC bias adjustment requiring stable component supply across industrial temperature grades and long-term parameter retention.

Supply support for X9C102ST2 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 mixed-signal devices, and power management ICs for industrial, automotive, and communications markets.

The X9C102ST2 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in applications demanding long-term stability, programmability, and nonvolatile setting retention.

FAQ

What is the end-to-end resistance tolerance of the X9C102ST2?

The X9C102ST2 has an end-to-end resistance tolerance of ±20% at 25°C. This specification applies to the nominal 1kΩ value and reflects manufacturing variation across the resistor array. The tolerance remains valid across the full operating temperature range (0°C to +70°C for commercial-grade variants), and the ratiometric temperature coefficient is ±20 ppm/°C - ensuring stable voltage division ratios despite ambient shifts.

Does the X9C102ST2 retain its wiper position after power cycling?

Yes, the X9C102ST2 retains its wiper position after power cycling using on-chip nonvolatile memory. When CS transitions high while INC is high, the current wiper position is stored and automatically recalled upon next power-up once VCC reaches regulation. Data retention is specified for 100 years under normal operating conditions, eliminating the need for host MCU initialization or external memory backup.

Can the X9C102ST2 operate with bipolar analog signals?

Yes, the X9C102ST2 supports bipolar analog signals: VH/RH and VL/RL terminals accept voltages from -5V to +5V relative to VSS, enabled by an internal charge pump. This allows direct use in AC-coupled or dual-supply circuits without external level-shifting. However, the absolute voltage difference between VH/RH and VL/RL must not exceed 4V for the X9C102ST2 variant, per absolute maximum ratings.

What is the wiper resistance of the X9C102ST2 and why does it matter?

The X9C102ST2 has a typical wiper resistance of 40Ω, with a maximum of 100Ω. This series resistance directly impacts accuracy when used as a two-terminal variable resistor - introducing insertion loss and limiting usable frequency bandwidth. In three-terminal potentiometer configurations, it affects linearity near end-points and contributes to thermal noise; designers must account for it in low-noise or high-precision gain-setting networks.

How is nonvolatile storage triggered on the X9C102ST2?

Nonvolatile storage on the X9C102ST2 is triggered by a rising edge on the CS pin while the INC pin is held high. This sequence writes the current 7-bit wiper counter value into EEPROM. The operation completes within 20ms (tCPH), after which the device enters standby mode. No additional commands or timing sequences are required - the store action is hardware-synchronized and deterministic.