Renesas X9251US24Z-2.7T1

Overview

X9251US24Z-2.7T1 from Renesas is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, 50kΩ end-to-end resistance, 2.7V–5.5V single-supply operation, and nonvolatile data registers-used for precision gain control, DC bias trimming, and programmable reference generation in analog signal chains.

For engineers reviewing the X9251US24Z-2.7T1 datasheet, X9251US24Z-2.7T1 pinout, X9251US24Z-2.7T1 application, or X9251US24Z-2.7T1 equivalent, this page delivers verified electrical specs, validated SPI timing behavior, confirmed 24-pin TSSOP package mapping, and real-world use cases in audio, sensor conditioning, and power management circuits.

Technical Context

The X9251US24Z-2.7T1 integrates four independent DCPs on a monolithic CMOS die, each with an 8-bit volatile Wiper Counter Register (WCR) and four 8-bit nonvolatile Data Registers (DR00–DR33). Wiper position is updated via SPI write, transfer, or increment/decrement commands-with tWRL ≤10µs wiper response after load instructions.

Its SPI interface complies with standard mode-0 (CPOL=0, CPHA=0), supports up to 2MHz clocking, includes hardware write protection (WP), device address selection (A0/A1), and HOLD for serial bus pause. Power-up loads DR#0 into each WCR, enabling deterministic startup behavior without host initialization.

Key Specifications

Pinout & Package

24-lead TSSOP (4.4mm body width, M24.173 drawing), RoHS-compliant, matte tin e3 termination. Pin 1 marked by dot; pins 6 and 19 are NC and must be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/SL, the X9251US24Z-2.7T1 uniquely provides four independent DCPs with nonvolatile data registers, enabling autonomous power-up behavior and eliminating host dependency for critical bias and reference settings.

Availability

X9251US24Z-2.7T1 is available at Aetrix Electronics and suitable for audio volume control, sensor signal conditioning, voltage regulator feedback, RF power amplifier bias, and industrial calibration requiring stable component supply and long-term parameter retention.

Supply support for X9251US24Z-2.7T1 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise applications.

The X9251 series is part of Renesas' XDCP™ digitally controlled potentiometer family, designed specifically for replacing mechanical trimmers in precision analog systems requiring programmable, nonvolatile, and low-power resistance adjustment.

FAQ

What is the power-up behavior of the X9251US24Z-2.7T1?

At power-up, the X9251US24Z-2.7T1 automatically loads the contents of DR00, DR10, DR20, and DR30 into their corresponding volatile Wiper Counter Registers (WCR0–WCR3). This ensures repeatable, deterministic wiper positions without host intervention-critical for systems that must operate immediately after cold start.

Does the X9251US24Z-2.7T1 support daisy-chained SPI connections?

The X9251US24Z-2.7T1 does not support true daisy-chaining because its SO pin is output-only and lacks a cascaded input. However, multiple X9251US24Z-2.7T1 devices can share one SPI bus using individual CS lines and unique A0/A1 address combinations-enabling up to four units on a single controller interface.

Can the X9251US24Z-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9251US24Z-2.7T1 supports two-terminal operation by connecting either RH or RL to the wiper (RW) terminal-effectively creating a programmable rheostat. This configuration is commonly used in current-setting networks, LED brightness control, and oscillator frequency tuning circuits.

What is the maximum wiper current rating for the X9251US24Z-2.7T1?

The X9251US24Z-2.7T1 specifies a maximum wiper current of ±3mA per DCP. Exceeding this limit risks irreversible damage to the internal CMOS switches. For higher-current applications, external buffer amplifiers or discrete FETs should be used to isolate the wiper node.

How does the HOLD pin function during SPI communication with the X9251US24Z-2.7T1?

The HOLD pin pauses ongoing SPI transactions without resetting the internal state machine. To activate, HOLD must be driven LOW while SCK is LOW; resuming requires driving HOLD HIGH while SCK remains LOW. This feature allows the host to service higher-priority interrupts and resume communication seamlessly-preserving instruction context and data integrity.