Renesas X9C102SI

Overview

X9C102SI from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 1 kΩ end-to-end resistance, 100 wiper tap points, nonvolatile wiper position storage, ±5 V terminal voltage rating, and 8-lead SOIC package. It functions as a solid-state three-terminal potentiometer or two-terminal variable resistor in precision analog trimming, power supply feedback networks, and programmable gain control circuits.

For engineers reviewing the X9C102SI datasheet, X9C102SI pinout, X9C102SI application, or X9C102SI equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial temperature range (–40°C to +85°C), RoHS-compliant packaging, and real-world use cases for embedded analog parameter adjustment.

Technical Context

The X9C102SI implements a 99-element resistor array with make-before-break wiper switching, controlled via a three-wire serial interface (CS, U/D, INC) using negative-edge-triggered increment logic. Its 7-bit up/down counter drives a decoder selecting one of 100 wiper positions, with wiper resistance typically 40 Ω and absolute linearity within ±1 MI.

Nonvolatile memory stores the last wiper position at power-down and recalls it on power-up; storage occurs only when CS transitions HIGH while INC is HIGH. The internal charge pump enables ±5 V operation across VH/RH and VL/RL terminals with a single 5 V supply, generating typical 20 mV_RMS noise at 850 kHz.

Key Specifications

Pinout & Package

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

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 X9C102SI offers direct drop-in compatibility for 1 kΩ analog trimming with zero firmware overhead for power-up recall, simpler three-wire control, and proven reliability in industrial temperature-cycled deployments.

Availability

X9C102SI is available at Aetrix Electronics and suitable for laser diode bias control, programmable power supply feedback, audio tone adjustment, and industrial sensor signal conditioning requiring stable component supply and guaranteed long-term manufacturability.

Supply support for X9C102SI 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 high-performance, reliable microcontrollers, analog, and power solutions for industrial, automotive, and communications markets.

The X9C102SI belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in analog signal-path calibration, power management, and sensor interface applications demanding nonvolatile setting retention.

FAQ

What is the maximum allowable voltage across the VH/RH and VL/RL terminals of the X9C102SI?

The X9C102SI specifies a maximum differential voltage ΔV = |VH/RH − VL/RL| of 4 V. This limit ensures safe operation of the internal resistor array and prevents breakdown or accelerated wear. Exceeding 4 V risks permanent damage, even if individual terminal voltages remain within their ±5 V rating relative to VSS. Always verify voltage differentials in your schematic before finalizing layout.

Does the X9C102SI retain its wiper position after power loss?

Yes, the X9C102SI retains its last-stored wiper position in nonvolatile memory for ≥100 years and automatically recalls it on power-up. Storage occurs only when CS transitions HIGH while INC is held HIGH - a deliberate action preventing accidental overwrite. No external memory or MCU intervention is required for repeatable startup behavior.

Can the X9C102SI be used with a 3.3 V microcontroller interface?

Yes, the X9C102SI's digital inputs (CS, U/D, INC) accept VIH ≥ 2 V and VIL ≤ 0.8 V, making them fully compatible with 3.3 V logic levels. However, VCC must still be 5 V ±10% to power the internal charge pump and ensure ±5 V analog operation. Use level-shifting only if driving from 1.8 V or 2.5 V systems.

What is the typical wiper resistance of the X9C102SI, and how does it affect circuit accuracy?

The X9C102SI has a typical wiper resistance of 40 Ω, with a maximum of 100 Ω. In high-impedance voltage divider configurations (e.g., >100 kΩ total resistance), this adds negligible error. However, in low-resistance applications like current-sense shunt calibration, it introduces measurable offset - always include RW in worst-case tolerance analysis for precision designs.

How does the X9C102SI's "make-before-break" wiper switching benefit analog circuits?

The X9C102SI's make-before-break switching prevents momentary open-circuit conditions during wiper stepping. This eliminates signal dropout or transient glitches in critical feedback paths - such as DC-DC converter regulation loops or op-amp gain networks - ensuring uninterrupted analog performance during dynamic reconfiguration.