Renesas X9C102SIZT1

Overview

X9C102SIZT1 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 bias adjustment in op-amp circuits.

For engineers reviewing the X9C102SIZT1 datasheet, X9C102SIZT1 pinout, X9C102SIZT1 application, or X9C102SIZT1 equivalent, key selection considerations include its 1kΩ end-to-end resistance, -40°C to +85°C industrial temperature range, SOIC-8 package, 750µA max standby current, and three-wire serial interface compatibility with microcontroller GPIOs.

Technical Context

The X9C102SIZT1 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 VH/RH and VL/RL terminals support ±5V terminal voltage ranges, while VW/RW exhibits 40Ω typical wiper resistance.

Operation relies on negative-edge-triggered INC input, level-sensitive U/D direction control, and CS-selectable active/standby modes. Wiper position is stored to nonvolatile memory only when CS transitions HIGH while INC is HIGH - enabling deterministic power-up recall without unintended writes during system initialization.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E), RoHS-compliant, surface-mount, 3.90mm × 4.90mm body, 1.27mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ-10 and MCP41HV51-103, the X9C102SIZT1 provides guaranteed power-up wiper recall without host intervention, lower pin count (3-wire vs. 4–5 wire), and tighter absolute linearity (±1 MI vs. ±2–3 LSB), making it optimal for self-contained analog trimming where reliability and deterministic startup are critical.

Availability

X9C102SIZT1 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, and audio equipment manufacturing requiring stable component supply and long-term obsolescence management.

Supply support for X9C102SIZT1 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 infrastructure markets.

The X9C102SIZT1 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in precision analog circuits where long-term stability, programmability, and nonvolatile setting retention are required.

FAQ

What is the maximum voltage that can be applied across the VH/RH and VL/RL terminals of the X9C102SIZT1?

The X9C102SIZT1 specifies a maximum differential voltage ΔV = |VH/RH − VL/RL| of 4V. This limit arises from the 1kΩ end-to-end resistance and internal power dissipation constraints. Exceeding 4V risks exceeding the 16mW power rating and may cause irreversible damage. Terminal voltages themselves are rated from –5V to +5V relative to VSS, but the voltage difference across the potentiometer terminals must remain within the 4V absolute maximum.

Does the X9C102SIZT1 require an external clock or timing circuit to operate?

No, the X9C102SIZT1 does not require an external clock. Its operation is fully asynchronous and driven solely by edge transitions on the INC input. The device uses internal logic to decode U/D state and increment/decrement its 7-bit counter on each negative edge of INC. All timing requirements - including INC cycle time (2µs min), setup/hold times, and wiper settling (100µs) - are met using standard CMOS-level GPIO toggling from any microcontroller or discrete logic source.

How is wiper position stored to nonvolatile memory in the X9C102SIZT1?

Wiper position is stored to nonvolatile memory in the X9C102SIZT1 only when two simultaneous conditions occur: CS transitions from LOW to HIGH, and the INC input is held HIGH at the moment of that transition. This precise timing requirement prevents accidental writes during normal operation. Once stored, the value persists for 100 years and is automatically recalled on next power-up, restoring the exact wiper position without MCU involvement.

Can the X9C102SIZT1 be used with supply voltages other than 5V?

The X9C102SIZT1 is specified for operation at 5V ±10% (4.5V to 5.5V). While the internal charge pump enables ±5V analog terminal operation, the digital control section (CS, U/D, INC) requires VCC within this range for proper logic threshold compliance and current consumption guarantees. Operation outside 4.5–5.5V violates recommended operating conditions and may result in unreliable wiper movement, failed NV storage, or increased leakage - the X9C102SIZT1 is not rated for 3.3V or 12V operation.

What is the significance of "make-before-break" wiper switching in the X9C102SIZT1?

"Make-before-break" means the X9C102SIZT1 briefly connects two adjacent resistor taps to the VW/RW terminal during wiper movement, preventing an open-circuit condition. This avoids signal interruption in active circuits - for example, in an op-amp gain-setting path, it eliminates momentary gain collapse or output transients. However, during multi-step moves, temporary parallel conduction can reduce effective RTOTAL; designers must allow ≥100µs settling time (tIW) after INC edges before sampling VW/RW.