Renesas X9258US24ZT1

Overview

X9258US24ZT1 from Intersil is a quad digital potentiometer IC integrating four 256-tap resistor arrays with volatile wiper counters and four non-volatile data registers per channel, supporting 2-wire (I²C-compatible) interface, ±5V dual analog supplies (V+/V−), and 50kΩ end-to-end resistance - used for precision gain/offset trimming in programmable instrumentation amplifiers.

For engineers reviewing the X9258US24ZT1 datasheet, X9258US24ZT1 pinout, X9258US24ZT1 application, or X9258US24ZT1 equivalent, key selection criteria include dual-supply analog operation (±5V), nonvolatile wiper storage with 100-year retention, 0.6% resolution, 40Ω typical wiper resistance at 5V, and SOIC-24 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The X9258US24ZT1 implements four independent 255-segment resistor arrays with CMOS switch-based wiper control driven by an 8-bit volatile Wiper Counter Register (WCR); each array supports three-terminal potentiometer or two-terminal variable resistor configurations. Wiper position is set via I²C commands including direct write, register transfer (DR→WCR), or real-time increment/decrement using SCL clock edges.

Nonvolatile storage uses on-chip EEPROM cells rated for 100,000 write cycles and 100 years of data retention; power-up automatically loads DR0 into each WCR. The 2-wire interface complies with standard I²C timing (fSCL ≤ 400kHz), supports up to 16 devices via A0–A3 address pins, and includes hardware write protection (WP pin) to prevent accidental DR writes.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), Pb-free (RoHS compliant), M24.3 drawing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad digital potentiometer applications.

Compared with AD5242BRUZ100 and MCP4642T-503E/ST, the X9258US24ZT1 uniquely supports native ±5V analog operation with hardware write protection and guaranteed 100-year data retention - making it the only option for industrial instrumentation requiring long-term calibration stability in bipolar signal chains.

Availability

X9258US24ZT1 is available at Aetrix Electronics and suitable for programmable gain amplifiers, precision sensor signal conditioning, DC offset nulling circuits, and configurable reference dividers requiring stable component supply across extended industrial temperature ranges.

Supply support for X9258US24ZT1 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 (now part of Renesas Electronics) designs high-performance analog and mixed-signal ICs for industrial, communications, and computing markets, emphasizing precision, reliability, and low-power operation.

The X9258 product line delivers digitally controlled potentiometers optimized for calibration-critical applications requiring nonvolatile storage, bipolar analog operation, and robust I²C interfacing in industrial environments.

FAQ

What is the absolute maximum voltage rating on the V+ and V− pins of the X9258US24ZT1?

The X9258US24ZT1 supports absolute maximum ratings of +10V on V+ and −10V on V−, with a maximum differential voltage (V+ − V−) of 12V. These limits ensure safe operation during transient conditions while maintaining specified performance within the recommended operating range of ±4.5V to ±5.5V. Exceeding these values may cause permanent damage to the internal resistor arrays or EEPROM cells.

Does the X9258US24ZT1 require power supply sequencing between VCC, V+, and V−?

No, the X9258US24ZT1 has no strict sequencing requirement: all three supplies (VCC, V+, V−) must reach their final values within 1ms of each other. However, wiper position recall from nonvolatile memory only occurs after all supplies stabilize, and analog pin voltages must remain within V− and V+ at all times. This simplifies power design in systems with independent regulators.

How does the WP (Write Protect) pin function on the X9258US24ZT1?

The WP pin on the X9258US24ZT1 is a low-active hardware lock that disables all nonvolatile writes to the Data Registers (DR0–DR3). When WP is pulled low, commands like Write Data Register or XFR WCR→DR are ignored - preventing accidental EEPROM corruption during firmware updates or ESD events. It does not affect volatile WCR writes or read operations.

What is the typical wiper resistance of the X9258US24ZT1 and how does it impact circuit accuracy?

The X9258US24ZT1 exhibits 40Ω typical wiper resistance at V+ = 5V and V− = −5V. This low value minimizes insertion error in low-impedance signal paths - for example, when used as a two-terminal variable resistor in op-amp feedback networks, it contributes less than 0.1% gain error in a 50kΩ configuration. Higher wiper resistance would degrade linearity and thermal stability.

Can the X9258US24ZT1 operate with a 2.7V VCC supply while maintaining full analog functionality?

Yes, the X9258US24ZT1 variant marked X9258US24ZT1-2.7 (or compatible ordering code) supports VCC from 2.7V to 5.5V while retaining full analog functionality - including ±4.5V to ±5.5V V+/V− operation and 50kΩ end-to-end resistance. This enables compatibility with low-voltage microcontrollers while preserving bipolar signal conditioning capability.