Renesas X9258US24I-2.7T2

Overview

X9258US24I-2.7T2 from Intersil is a quad digital potentiometer IC with 256-tap resolution per channel, dual ±2.7V to ±5.5V analog supplies (V+/V−), and 2-wire I²C-compatible interface. It integrates four independent 50kΩ resistor arrays, each with volatile wiper counter registers and four nonvolatile data registers, enabling precise programmable gain control in audio signal chains and sensor calibration circuits.

For engineers reviewing the X9258US24I-2.7T2 datasheet, X9258US24I-2.7T2 pinout, X9258US24I-2.7T2 application, or X9258US24I-2.7T2 equivalent, key selection criteria include its −40°C to +85°C industrial temperature range, 40Ω typical wiper resistance at ±5V, <5µA standby current, and hardware write-protect (WP) pin for register integrity during power transitions.

Technical Context

The X9258US24I-2.7T2 implements four independent 255-segment resistor arrays with CMOS switch-based wiper positioning controlled by an 8-bit Wiper Counter Register (WCR). Each array supports three-terminal potentiometer or two-terminal variable resistor configurations, with VH/RH and VL/RL pins defining terminal voltage rails and VW/RW delivering the digitally selected tap voltage.

Its 2-wire serial interface operates up to 400kHz, supports slave address configuration via A0–A3 inputs (allowing up to 16 devices on one bus), and includes dedicated instructions for direct WCR writes, DR↔WCR transfers, and real-time increment/decrement control synchronized to SCL edges-enabling fine-grained analog tuning without host CPU intervention.

Key Specifications

Pinout & Package

Package: 24-lead SOIC (300 mil), RoHS-compliant, Pb-free matte tin finish (e3 termination).

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9258US24I-2.7T2, AD5242BRUZ10 offers lower cost per channel but requires four units to match quad functionality and cannot replicate bipolar operation, while MCP42010-I/P provides simpler SPI timing but sacrifices analog supply flexibility, wiper performance, and hardware write protection critical in industrial environments.

Availability

X9258US24I-2.7T2 is available at Aetrix Electronics and suitable for industrial motor control, medical sensor calibration, professional audio equipment, and embedded test instrumentation requiring stable component supply across extended temperature and voltage ranges.

Supply support for X9258US24I-2.7T2 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 programmable analog functions-including quad DCPs with nonvolatile storage and dual-supply capability-targeting applications demanding recalibration resilience, bipolar signal handling, and long-term parameter stability.

FAQ

What is the operating voltage range for the analog section of the X9258US24I-2.7T2?

The X9258US24I-2.7T2 supports analog supplies V+ and V− from ±2.7V to ±5.5V, enabling true bipolar operation across its resistor arrays. This range is independent of the 2.7V–5.5V VCC digital supply, allowing the device to condition signals spanning both positive and negative rails-critical for op-amp feedback and sensor front-end designs where X9258US24I-2.7T2 replaces mechanical trimmers.

How does the hardware write protect (WP) pin function on the X9258US24I-2.7T2?

The WP pin on the X9258US24I-2.7T2 is an active-low input that disables all nonvolatile writes to the four data registers (DR0–DR3) when asserted. When WP = LOW, commands like Write Data Register or XFR WCR to DR are ignored, preventing accidental overwrites during power-up/down sequences or noise events-ensuring X9258US24I-2.7T2 retains factory-calibrated settings even in electrically noisy industrial environments.

Can the X9258US24I-2.7T2 be used as a two-terminal variable resistor?

Yes, the X9258US24I-2.7T2 supports two-terminal variable resistor mode by connecting either VH or VL to the wiper (VW/RW) and using the remaining terminal as the adjustable node. This configuration leverages the same 256-tap resolution and nonvolatile storage as three-terminal use, making X9258US24I-2.7T2 suitable for current-limiting, bias adjustment, or gain-setting where only one variable endpoint is needed.

What is the wiper resistance specification for the X9258US24I-2.7T2 and why does it matter?

The X9258US24I-2.7T2 has a typical wiper resistance of 40Ω at ±5V analog supplies. This low value minimizes insertion loss and gain error when used in high-precision feedback networks or low-impedance signal paths. In contrast, higher wiper resistances (e.g., >100Ω) introduce measurable voltage drop under load, degrading linearity-making X9258US24I-2.7T2's 40Ω spec essential for maintaining accuracy in calibrated sensor interfaces.

Does the X9258US24I-2.7T2 require power supply sequencing during startup?

No, the X9258US24I-2.7T2 imposes no strict sequencing requirement between VCC, V+, and V−. All three supplies must reach stable values within 1ms of each other, and potentiometer pin voltages must remain between V− and V+ at all times. Once stable, X9258US24I-2.7T2 automatically loads DR0 into each WCR-eliminating complex power-rail coordination and simplifying system design compared to DCPs mandating strict V+ before VCC sequencing.