Renesas X9C303S8I

Overview

X9C303S8I from Intersil is a logarithmic digitally controlled potentiometer (XDCP™) with 100 tap positions, 32kΩ end-to-end resistance (±15%), ±5V terminal voltage rating, and nonvolatile wiper position storage. It functions as a solid-state three-terminal potentiometer or two-terminal variable resistor in precision analog trimming applications such as audio volume control and sensor calibration circuits.

For engineers reviewing the X9C303S8I datasheet, X9C303S8I pinout, X9C303S8I application, or X9C303S8I equivalent, key selection criteria include log taper accuracy (±0.115 dB step error), wiper resistance (40 Ω typical), industrial temperature range (–40°C to +85°C), and compatibility with 5V CMOS logic interfaces.

Technical Context

The X9C303S8I implements a 7-bit up/down counter driving a 100-position decoder across a 99-element logarithmic resistor array. Wiper movement follows make-before-break switching, preventing open-circuit transients during tap transitions.

Nonvolatile memory stores the last wiper position upon CS↑/INC↑ edge and recalls it at power-up. Control is executed via three-wire serial interface (CS, U/D, INC) with 2 µs minimum INC cycle time and 100 µs INC-to-VW propagation delay.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (150 mil), RoHS-compliant, Pb-free matte tin termination (MDP0027).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5292BRUZ-20 and MCP41HV51-103, the X9C303S8I delivers log taper accuracy and autonomous power-up recall without MCU intervention-critical for cost-sensitive, low-pin-count designs where audio fidelity or self-contained calibration is prioritized over raw resolution or voltage headroom.

Availability

X9C303S8I is available at Aetrix Electronics and suitable for audio volume control, sensor signal conditioning, power supply trim, and industrial DAC output scaling requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9C303S8I 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

Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9C303 product line delivers digitally programmable resistance with nonvolatile storage for analog system calibration-targeting cost-sensitive industrial, consumer, and communications equipment needing reliable, self-contained trimming without external memory or complex firmware.

FAQ

What is the maximum allowable voltage across VH and VL terminals for the X9C303S8I?

The X9C303S8I supports a maximum differential voltage of |VH − VL| = 10 V, with each terminal rated for –5 V to +5 V relative to VSS. This allows bipolar signal handling in AC-coupled configurations and ensures safe operation within standard analog signal ranges without external clamping circuitry. Exceeding ±5 V on either terminal or 10 V total may damage the internal resistor array or switches.

Does the X9C303S8I require an external clock or microcontroller to retain its wiper position after power loss?

No, the X9C303S8I does not require external components to retain wiper position. Its integrated nonvolatile memory automatically stores the current wiper setting upon a CS↑/INC↑ edge and recalls it at next power-up. The X9C303S8I maintains this stored value for up to 100 years at +55°C, eliminating dependency on MCU firmware or backup power sources for calibration persistence.

Can the X9C303S8I be used in a two-terminal (rheostat) configuration?

Yes, the X9C303S8I can operate as a two-terminal variable resistor by connecting either VH or VL to VW and using the remaining fixed terminal with VW as the adjustable node. In this mode, resistance varies from near-zero (wiper at connected terminal) to full 32 kΩ (wiper at opposite terminal), maintaining log taper behavior. The 40 Ω typical wiper resistance remains in series with the adjusted path.

What is the wiper resistance specification for the X9C303S8I, and how does it affect signal integrity?

The X9C303S8I has a typical wiper resistance of 40 Ω, with a maximum of 100 Ω. This low series impedance minimizes insertion loss and gain error in voltage-divider or feedback-path applications-especially critical in high-impedance sensor interfaces or precision op-amp circuits. At 1 kHz, resistor noise is 23 nV/√Hz, ensuring negligible contribution to overall system noise floor when properly decoupled.

Is the X9C303S8I pin-compatible with other members of the X9C303 family, such as X9C303S8Z or X9C303V8I?

Yes, the X9C303S8I shares identical pinout and electrical interface with all SOIC-packaged X9C303 variants (e.g., X9C303S8Z, X9C303S8IZ) and TSSOP variants (e.g., X9C303V8I), as confirmed by MDP0027 and M8.173 package drawings. Differences are limited to temperature grade (–40°C to +85°C for X9C303S8I), Pb-free compliance (indicated by "Z" suffix), and packaging-no functional or pinout divergence exists within the X9C303 family's SOIC/TSSOP footprints.