Renesas X9C303S8IZ

Overview

X9C303S8IZ 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 signal conditioning.

For engineers reviewing the X9C303S8IZ datasheet, X9C303S8IZ pinout, X9C303S8IZ application, or X9C303S8IZ 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), Pb-free SOIC-8 packaging, and three-wire serial interface compatibility with microcontroller GPIOs.

Technical Context

The X9C303S8IZ implements a 7-bit up/down counter driving a 100-position decoder to select taps across a 99-element logarithmic resistor array. Wiper movement follows make-before-break switching, preventing open-circuit transients during position changes.

Nonvolatile memory stores the last wiper position upon CS↑ with INC HIGH, enabling automatic recall at power-up. The device operates exclusively at VCC = 5V ±10%, with active current ≤3 mA and standby current ≤750 µA - optimized for low-power embedded systems requiring persistent analog tuning.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ10 and MCP41010-I/P, the X9C303S8IZ uniquely delivers logarithmic taper, nonvolatile wiper storage, and ±5 V bipolar operation in a minimal three-wire interface - making it optimal for audio and industrial trimming where power-cycle persistence and human-perceptual linearity are critical.

Availability

X9C303S8IZ 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 X9C303S8IZ 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 industrial, communications, and computing markets.

The X9C303 family was developed specifically for replacing mechanical potentiometers in digitally adjustable analog circuits - emphasizing reliability, nonvolatile setting retention, and logarithmic response for human-interface applications.

FAQ

What is the maximum allowable voltage across VH and VL terminals for the X9C303S8IZ?

The X9C303S8IZ supports a maximum differential voltage ΔV = |VH − VL| of 10 V. Each terminal is rated for –5 V to +5 V relative to VSS, meaning VH and VL may be biased at opposite extremes (e.g., VH = +5 V, VL = –5 V) but must never exceed ±5 V with respect to ground. Exceeding these limits risks permanent damage to the internal resistor array or switches.

Does the X9C303S8IZ require an external clock or data line for communication?

No, the X9C303S8IZ uses a self-contained three-wire interface: CS (chip select), U/D (up/down direction), and INC (increment clock). It requires no external clock source or serial data line - INC is edge-triggered and U/D sets direction synchronously. This reduces MCU pin count and eliminates timing-critical data framing overhead compared to I²C or SPI potentiometers.

How does the X9C303S8IZ retain its wiper position after power loss?

The X9C303S8IZ stores the current wiper position in on-chip nonvolatile memory when CS transitions HIGH while INC is held HIGH. Upon subsequent power-up, the stored value is automatically recalled and loaded into the wiper counter, restoring the last programmed tap position without host intervention - enabling true "set-and-forget" analog configuration.

Can the X9C303S8IZ be used in a two-terminal variable resistor configuration?

Yes, the X9C303S8IZ supports two-terminal operation by connecting either VH or VL to VW (wiper) and using the remaining fixed terminal plus VW as the variable resistance path. In this mode, resistance varies from near-zero (at wiper extreme) to full 32 kΩ, with logarithmic step spacing preserved - ideal for bias current or threshold adjustment where absolute linearity is not required.

Is the X9C303S8IZ pin-compatible with other members of the X9C303 family?

Yes, all X9C303 variants - including X9C303S8I, X9C303S8Z, and X9C303S8IZ - share identical 8-lead SOIC pinouts and electrical behavior. The suffix differences indicate temperature grade (I = –40°C to +85°C), Pb-free compliance (Z), and packaging (S = SOIC). Thus, X9C303S8IZ can directly replace X9C303S8I in industrial designs requiring RoHS compliance without layout changes.