Renesas X9251UV24IZ-2.7

Overview

X9251UV24IZ-2.7 from Renesas is a quad digitally controlled potentiometer (XDCP™) with 256-tap resolution, SPI interface, 50kΩ end-to-end resistance, -40°C to +85°C operating range, and 2.7V–5.5V single-supply operation-used for precision gain control, DC bias trimming, and programmable reference generation in sensor signal conditioning and power management circuits.

For engineers reviewing the X9251UV24IZ-2.7 datasheet, X9251UV24IZ-2.7 pinout, X9251UV24IZ-2.7 application, or X9251UV24IZ-2.7 equivalent, this page delivers verified electrical specs, validated SPI timing, confirmed TSSOP-24 package mapping, wiper register behavior, nonvolatile data register endurance (100,000 cycles), and real-world use cases including LCD contrast adjustment and RF amplifier biasing.

Technical Context

The X9251UV24IZ-2.7 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 (DR0–DR3). Wiper position is updated via SPI write, transfer, or increment/decrement commands, with tWRL ≤ 10µs response latency after instruction completion.

It implements resistor arrays using CMOS switches and thin-film resistors, supporting both three-terminal potentiometer and two-terminal variable resistor configurations. The device uses a fixed 0101 device ID and supports slave addressing via A0/A1 pins, with hardware write protection (WP) and HOLD pause functionality fully compliant with standard SPI timing (fSCK ≤ 2MHz).

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, M24.173 footprint. Pin 1 marked with dot; pins 6 and 19 are NC and must remain unconnected.

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 X9251UV24IZ-2.7 uniquely combines industrial temperature rating (-40°C to +85°C), hardware write protection, HOLD functionality, and quad 50kΩ channels in a single SPI-compatible device-making it optimal for embedded systems requiring field-reprogrammable calibration under harsh conditions.

Availability

X9251UV24IZ-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, RF power control, LCD display tuning, and audio system design requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9251UV24IZ-2.7 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 connectivity solutions for automotive, industrial, and enterprise applications.

The X9251 belongs to Renesas' XDCP™ digitally controlled potentiometer family, engineered for replacing mechanical trimmers in precision analog control loops where programmability, reliability, and nonvolatile calibration storage are critical.

FAQ

What is the operating temperature range of the X9251UV24IZ-2.7?

The X9251UV24IZ-2.7 is specified for industrial operation from -40°C to +85°C. This range is explicitly defined in the Ordering Information table on page 3 of FN8166 Rev 7.00 and confirmed in the Recommended Operating Conditions section on page 12. It supports deployment in automotive cabin modules, industrial PLCs, and outdoor communication equipment where ambient extremes are expected.

Does the X9251UV24IZ-2.7 support true SPI mode 0 (CPOL=0, CPHA=0)?

Yes, the X9251UV24IZ-2.7 operates in SPI mode 0: data is sampled on the rising edge of SCK (CPHA=0) and clocked out on the falling edge (CPOL=0), as documented in the Serial Input (SI) and Serial Output (SO) functional descriptions on pages 4–5. All timing parameters-including tSU, tH, tV, and tHO-are defined relative to this clock polarity and phase.

How many nonvolatile data registers does each potentiometer in the X9251UV24IZ-2.7 have?

Each of the four potentiometers in the X9251UV24IZ-2.7 has four 8-bit nonvolatile Data Registers (DR00–DR03 for DCP0, DR10–DR13 for DCP1, etc.), as stated in the Features list (page 1) and detailed in the Data Registers (DR) section (page 5). These registers retain values for 100 years and withstand 100,000 write cycles.

Can the X9251UV24IZ-2.7 be used as a two-terminal variable resistor?

Yes, the X9251UV24IZ-2.7 supports two-terminal variable resistor operation by connecting either RH or RL to the wiper (RW) terminal externally, as shown in the "Basic Configurations" diagram on page 17. This configuration eliminates the third terminal and enables current-setting or impedance-matching applications without modifying internal register settings.

What happens to the wiper position of the X9251UV24IZ-2.7 at power-up?

At power-up, the X9251UV24IZ-2.7 automatically loads the contents of DR00, DR10, DR20, and DR30 into WCR0, WCR1, WCR2, and WCR3 respectively, as described in the Power-Up section (page 5) and Figure 2. This ensures deterministic startup behavior without requiring host initialization, critical for fail-safe analog subsystems.