Renesas X9C103ST2

Overview

X9C103ST2 from Renesas Electronics is a digitally controlled potentiometer (XDCP™) implementing a 99-element resistor array with 100 wiper tap points, nonvolatile memory for power-up recall, ±20% end-to-end resistance tolerance, and 40 Ω typical wiper resistance - used for precision analog trimming in voltage divider and variable resistor configurations.

For engineers reviewing the X9C103ST2 datasheet, X9C103ST2 pinout, X9C103ST2 application, or X9C103ST2 equivalent, key selection criteria include its 10 kΩ nominal resistance, three-wire serial interface (CS/U/D/INC), SOIC-8 package, -40°C to +85°C industrial temperature range, and nonvolatile wiper position storage requiring no external EEPROM.

Technical Context

The X9C103ST2 integrates a 7-bit up/down counter, one-of-100 decoder, and nonvolatile memory to control wiper position across a temperature-compensated 99-resistor ladder. Its make-before-break switching ensures continuity during tap transitions, while internal charge pump enables ±5 V terminal voltage operation from a single 5 V supply.

Wiper movement is edge-triggered via negative-going INC pulses, direction-controlled by U/D logic level, and enabled by active-low CS. A store operation occurs only when CS rises while INC is high, writing current position to memory with 100-year data retention and 100,000-cycle endurance.

Key Specifications

Pinout & Package

Package: 8-lead narrow-body SOIC (M8.15E footprint), RoHS-compliant, surface-mountable 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 AD5173BRMZ-10 and MCP41HV51-103, the X9C103ST2 offers simpler three-wire control, lower wiper resistance, and superior temperature stability for industrial-grade trimming - at the cost of lower resolution and no multi-device bus capability.

Availability

X9C103ST2 is available at Aetrix Electronics and suitable for laser diode biasing, programmable gain amplification, DC-DC feedback adjustment, and audio channel balancing requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9C103ST2 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 automotive, industrial, and IoT applications.

The X9C103ST2 belongs to Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in industrial instrumentation, power management, and signal conditioning where reliability, nonvolatility, and analog precision are critical.

FAQ

What is the nominal resistance and tolerance of the X9C103ST2?

The X9C103ST2 has a nominal end-to-end resistance of 10 kΩ with a tolerance of ±20%, as specified in the FN8222 datasheet. This tolerance reflects manufacturing variation across the resistor ladder and must be accounted for in absolute voltage divider accuracy calculations. The X9C103ST2 achieves ratiometric stability better than ±20 ppm/°C, making it suitable for applications where relative tap-to-tap matching matters more than absolute resistance value.

Does the X9C103ST2 retain its wiper position after power loss?

Yes, the X9C103ST2 stores the last wiper position in nonvolatile memory and automatically recalls it upon power-up. This recall occurs once VCC reaches its final regulated value, and the stored value remains valid for up to 100 years under normal operating conditions. No external backup power or configuration code is required - the X9C103ST2 resumes operation at the previously set tap position immediately after power stabilization.

What package type and footprint does the X9C103ST2 use?

The X9C103ST2 uses an 8-lead narrow-body SOIC package conforming to JEDEC MS-012-AA and Renesas drawing M8.15E. It features a 1.27 mm lead pitch, 3.90 mm body width, and 4.90 mm body length. The recommended land pattern is provided in the datasheet on page 9, and the device is RoHS-compliant with matte tin (e3) termination suitable for both SnPb and Pb-free reflow processes.

Can the X9C103ST2 operate with bipolar analog voltages?

Yes, the X9C103ST2 supports ±5 V applied to its VH/RH and VL/RL terminals relative to VSS, enabled by an internal charge pump powered from the 5 V VCC supply. This allows direct use in bipolar signal paths - such as op-amp offset nulling or audio AC coupling - without requiring dual power supplies. However, the maximum differential voltage ΔV = |VH/RH − VL/RL| is limited to 10 V for the X9C103ST2, per Absolute Maximum Ratings.

How is wiper position updated and stored in the X9C103ST2?

Wiper position is updated by toggling the INC input on its negative edge while CS is low and U/D sets direction. To store the current position in nonvolatile memory, CS must transition from low to high while INC is held high - this triggers a 20 ms store cycle. During storage, the device enters standby mode. If CS rises with INC low, the wiper position remains volatile and will revert to the last stored value on next power-up.