Renesas X9251US24IZ-2.7T1

Overview

X9251US24IZ-2.7T1 from Renesas Electronics 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 -40°C to +85°C industrial temperature range-used for precision gain control in audio amplifiers and DC bias trimming in RF power amplifier stages.

For engineers reviewing the X9251US24IZ-2.7T1 datasheet, X9251US24IZ-2.7T1 pinout, X9251US24IZ-2.7T1 application, or X9251US24IZ-2.7T1 equivalent, this page delivers verified electrical specs, validated SPI timing constraints, confirmed nonvolatile register architecture, and real-world circuit-level use cases including LCD contrast adjustment and sensor signal conditioning.

Technical Context

The X9251US24IZ-2.7T1 implements four independent DCPs using resistor ladders and CMOS switches, each controlled by an 8-bit volatile Wiper Counter Register (WCR) and backed by four 8-bit nonvolatile Data Registers (DR00–DR33). Wiper position updates occur in ≤10µs after instruction completion (tWRL), and power-up loads DR#0 into the corresponding WCR.

SPI communication follows standard mode 0 (CPOL=0, CPHA=0), with SCK up to 2MHz, hardware write protection via active-low WP pin, and dual device address pins (A0/A1) enabling up to four devices on one bus. The HOLD pin supports pausing serial transfers without resetting the sequence.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free, MSL Level 3 per JEDEC J-STD-020.

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/P, the X9251US24IZ-2.7T1 uniquely delivers quad-channel SPI control with hardware write protection, four nonvolatile registers per channel, and industrial-grade temperature support-making it optimal for space-constrained, calibration-critical embedded systems requiring robustness and configurability.

Availability

X9251US24IZ-2.7T1 is available at Aetrix Electronics and suitable for audio amplifier gain tuning, RF power amplifier biasing, LCD contrast control, and sensor signal conditioning requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for X9251US24IZ-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 IoT applications.

The X9251 product line was designed for digitally programmable analog front-ends in embedded systems requiring calibration stability, multi-channel coordination, and nonvolatile parameter storage without external memory.

FAQ

What is the function of the HOLD pin on the X9251US24IZ-2.7T1?

The HOLD pin on the X9251US24IZ-2.7T1 pauses ongoing SPI communication without resetting the instruction sequence. When asserted LOW while SCK is LOW, it suspends data transfer; resuming requires bringing HOLD HIGH while SCK remains LOW. This enables time-critical host tasks to interrupt serial operations safely-preserving register state and avoiding reinitialization overhead in the X9251US24IZ-2.7T1.

How does the X9251US24IZ-2.7T1 handle power-up initialization?

At power-up, the X9251US24IZ-2.7T1 automatically loads the contents of Data Register zero (DR00, DR10, DR20, DR30) into the corresponding volatile Wiper Counter Registers (WCR0–WCR3). This ensures repeatable startup behavior without host intervention. The X9251US24IZ-2.7T1 requires VCC to stabilize before issuing commands, with tPUR = 1ms minimum delay before first read and tPUW = 50ms before first write.

Can the X9251US24IZ-2.7T1 be used as a two-terminal variable resistor?

Yes-the X9251US24IZ-2.7T1 supports two-terminal operation by connecting either RH or RL to the wiper (RW) pin, effectively creating a digitally adjustable rheostat. This configuration is commonly used for LED current limiting or sensor bridge balancing. The X9251US24IZ-2.7T1's 50kΩ end-to-end resistance and 220Ω typical wiper resistance ensure predictable current control within ±20% tolerance.

What is the maximum SPI clock frequency supported by the X9251US24IZ-2.7T1?

The X9251US24IZ-2.7T1 supports SPI clock frequencies up to 2MHz under recommended operating conditions. Timing parameters-including tSU (50ns setup), tH (50ns hold), and tCYC (500ns min cycle)-are specified for reliable operation at this rate. Exceeding 2MHz may violate internal timing margins and cause register access failures in the X9251US24IZ-2.7T1.

Does the X9251US24IZ-2.7T1 require external components for basic operation?

No external passive components are required for core functionality of the X9251US24IZ-2.7T1. Pull-up resistors on CS, WP, and HOLD are optional but recommended for noise immunity in noisy environments. The X9251US24IZ-2.7T1 operates with direct connection to a 3.3V or 5V MCU SPI port, provided VCC meets 2.7–5.5V and address pins A0/A1 are tied to fixed logic levels.