Renesas X9C303V8IZ

Overview

X9C303V8IZ 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 audio gain control, sensor calibration, and power supply trimming circuits.

For engineers reviewing the X9C303V8IZ datasheet, X9C303V8IZ pinout, X9C303V8IZ application, or X9C303V8IZ equivalent, key selection criteria include log taper accuracy (±0.115 dB step error), wiper resistance (40 Ω typical), 750 µA max standby current, and TSSOP-8 Pb-free RoHS-compliant packaging for industrial temperature range (–40°C to +85°C).

Technical Context

The X9C303V8IZ 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.

Control uses a three-wire serial interface (CS, U/D, INC) with negative-edge-triggered INC and direction-selectable U/D. Nonvolatile memory stores wiper position on CS↑ while INC = HIGH, enabling automatic recall at power-up without external controller intervention.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (4.4 mm body width), Pb-free (RoHS compliant), JEDEC MO-153-AC compliant, industrial temperature grade.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9C303V8IZ, AD5243BRMZ10 offers dual-channel I²C control but lacks log taper and nonvolatile storage per channel, while MCP41010-I/P provides lower resistance and SPI compatibility but requires continuous host management due to volatile memory - making X9C303V8IZ uniquely suited for self-contained, log-taper, power-cycle-robust analog trimming.

Availability

X9C303V8IZ is available at Aetrix Electronics and suitable for audio volume control, sensor calibration, power supply trimming, and industrial DAC scaling requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9C303V8IZ 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, emphasizing precision, reliability, and industrial-grade qualification.

The X9C303V8IZ belongs to Intersil's XDCP™ family of digitally controlled potentiometers, engineered specifically for replacing mechanical pots in trimming, calibration, and gain-setting applications where nonvolatility, log taper, and robustness are critical.

FAQ

What is the maximum voltage that can be applied across VH and VL terminals of the X9C303V8IZ?

The X9C303V8IZ 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 use in bipolar signal paths and rail-to-rail analog interfaces without exceeding absolute maximum ratings. Exceeding ±5 V on either terminal or >10 V across VH–VL risks permanent damage per the Absolute Maximum Ratings table in FN8223 Rev 2.00.

Does the X9C303V8IZ retain its wiper position after power cycling?

Yes, the X9C303V8IZ retains its last stored wiper position in nonvolatile memory for up to 100 years at +55°C. Upon power-up, the device automatically recalls the stored value and configures the wiper accordingly. This behavior is intrinsic to the X9C303V8IZ design and requires no external components or initialization code - a key differentiator from volatile digital potentiometers.

Can the X9C303V8IZ be used as a two-terminal variable resistor?

Yes, the X9C303V8IZ can operate as a two-terminal variable resistor by connecting either VH or VL to VW and using the remaining fixed terminal with VW. The datasheet explicitly confirms this configuration, and the 40 Ω typical wiper resistance ensures minimal impact on effective resistance range. This mode is commonly used in op-amp gain-setting and sensor bridge balancing applications.

What is the wiper resistance specification for the X9C303V8IZ, and why does it matter?

The X9C303V8IZ has a typical wiper resistance of 40 Ω, with a maximum of 100 Ω. This value directly impacts insertion loss and signal integrity when used in series with sensitive analog nodes - especially in high-impedance feedback paths or low-level sensor interfaces. Lower wiper resistance preserves gain accuracy and bandwidth, making the X9C303V8IZ suitable for precision trimming where <100 Ω series impedance is acceptable.

Is the X9C303V8IZ pin-compatible with other members of the X9C303 family?

Yes, the X9C303V8IZ shares identical pinout and electrical interface with all X9C303 variants in TSSOP-8 package (e.g., X9C303V8I, X9C303V8Z), including matching VH/VL/VW/VSS/VCC/CS/INC/U/D assignments and timing specifications. Differences are limited to temperature grade, Pb-free status, and packaging - all fully interoperable at the board level without layout changes.