Renesas X9C102SZT1

Overview

X9C102SZT1 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) with 1 kΩ end-to-end resistance, 100 wiper tap points, and nonvolatile memory for power-up recall. It implements a 99-element resistor array with make-before-break switching, operates from a single 5 V supply, and uses a three-wire serial interface (CS, U/D, INC) for wiper positioning in analog signal conditioning and parameter trimming circuits.

For engineers reviewing the X9C102SZT1 datasheet, X9C102SZT1 pinout, X9C102SZT1 application, or X9C102SZT1 equivalent, this page delivers verified specifications, SOIC-8 package details, real-world use cases in voltage divider and variable resistor configurations, and two validated alternative parts with documented functional and application differences.

Technical Context

The X9C102SZT1 integrates a 7-bit up/down counter, one-of-hundred decoder, and nonvolatile memory to control wiper position across a temperature-compensated 99-resistor array. Its solid-state architecture eliminates mechanical wear while supporting ±5 V terminal voltages and ±4.4 mA wiper current.

Wiper movement is negative-edge triggered on INC, directionally controlled by U/D, and latched into memory upon CS rising edge with INC high. The internal charge pump enables rail-to-rail analog operation despite single 5 V supply, though it introduces 20 mV_RMS noise at 850 kHz.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, tape-and-reel (T1 suffix), 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 X9C102SZT1, AD5171BRMZ-10 offers wider analog voltage range but lacks autonomous power-up recall, while MCP41010-I/P delivers finer resolution and faster updates but requires continuous MCU supervision-making X9C102SZT1 optimal for self-contained, low-firmware-overhead trimming tasks.

Availability

X9C102SZT1 is available at Aetrix Electronics and suitable for audio signal level control, voltage reference trimming, power supply feedback adjustment, and sensor signal conditioning requiring stable component supply and guaranteed long-term manufacturability.

Supply support for X9C102SZT1 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 SoC solutions for industrial, automotive, and infrastructure markets.

The X9C102SZT1 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 where reliability and nonvolatile setting retention are essential.

FAQ

What is the maximum voltage that can be applied across the VH/RH and VL/RL terminals of the X9C102SZT1?

The X9C102SZT1 allows a maximum differential voltage of 4 V between VH/RH and VL/RL terminals, as specified in its Absolute Maximum Ratings table. This limit applies regardless of individual terminal voltages, which may each swing from −5 V to +5 V relative to VSS. Exceeding 4 V differential risks damaging the internal resistor array or switches. The 1 kΩ end-to-end resistance and ±20% tolerance further constrain usable voltage ranges in precision applications.

Does the X9C102SZT1 retain its wiper position after power cycling?

Yes, the X9C102SZT1 retains its wiper position after power cycling because it stores the last-set value in nonvolatile memory. Upon power-up, the device automatically recalls this stored position and configures the wiper accordingly-no external MCU intervention or initialization sequence is required. This behavior is intrinsic to the XDCP™ architecture and confirmed in the device's Principles of Operation section, where recall is stated to occur "when power is restored."

Can the X9C102SZT1 be used with a 3.3 V microcontroller interface?

Yes, the X9C102SZT1 can interface with a 3.3 V microcontroller, provided its digital inputs (CS, U/D, INC) meet the VIH ≥ 2 V and VIL ≤ 0.8 V thresholds specified in the Electrical Specifications table. Since these levels are compatible with 3.3 V CMOS logic, direct connection is permissible-but VCC must remain at 5 V ±10% to ensure proper analog operation and charge pump functionality. Do not tie VCC to 3.3 V.

What is the wiper resistance specification for the X9C102SZT1, and why does it matter?

The X9C102SZT1 has a typical wiper resistance of 40 Ω, with a maximum of 100 Ω, measured at ±1 mA wiper current. This resistance directly adds to signal path impedance-critical in low-gain or high-precision applications like op-amp feedback networks or reference dividers. For example, in a 1 kΩ total potentiometer, 100 Ω wiper resistance introduces up to 10% error at extreme tap positions, necessitating layout or compensation awareness.

How does the X9C102SZT1 handle rapid wiper movements across multiple taps?

The X9C102SZT1 uses make-before-break switching, so during multi-tap movement, several adjacent resistor nodes connect briefly to the wiper terminal. This causes temporary reduction in effective end-to-end resistance-potentially down to ~10–20 Ω for large jumps-and introduces transient current spikes. The datasheet specifies tIW (INC to VW/RW change) as 100 µs, meaning full settling occurs within that window. Avoid rapid successive INC edges unless transient behavior is accounted for in circuit timing.