Renesas X9251UV24I

Overview

X9251UV24I from Renesas Electronics is a quad digitally controlled potentiometer (XDCP™) IC integrating four independent 256-tap, 50kΩ end-to-end resistance DCPs with SPI interface, nonvolatile data registers, and wiper position recall at power-up - used for precision gain control, DC bias trimming, and programmable reference generation in analog signal chains.

For engineers reviewing the X9251UV24I datasheet, X9251UV24I pinout, X9251UV24I application, or X9251UV24I equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters (2.7V–5.5V, -40°C to +85°C), and real-world circuit-level use cases - all traceable to FN8166 Rev 7.00.

Technical Context

The X9251UV24I implements four independent CMOS-switched resistor arrays, each with 256 discrete tap positions and an associated volatile 8-bit Wiper Counter Register (WCR) plus four nonvolatile 8-bit Data Registers (DR00–DR33). Wiper position is updated via SPI write, transfer, or increment/decrement commands - with tWRL ≤ 10µs response time after instruction issuance.

It supports full SPI bus operation (CS, SCK, SI, SO, HOLD, WP) with device addressing via A0/A1 pins, hardware write protection, and automatic DR0x-to-WCRx load at power-up. Standby current is <5µA, and nonvolatile writes endure 100,000 cycles with 100-year data retention.

Key Specifications

Pinout & Package

24-lead TSSOP (4.4mm width, Pb-free, RoHS-compliant, package drawing M24.173) with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5204BRUZ10 and MCP42050-I/SL, the X9251UV24I provides superior resolution (256 vs. 128 taps), guaranteed 50kΩ ±20% resistance, full SPI feature set including HOLD, and four nonvolatile registers per DCP - making it optimal for high-precision, field-calibratable industrial analog systems.

Availability

X9251UV24I is available at Aetrix Electronics and suitable for industrial sensor conditioning, programmable power supply feedback, and RF bias control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X9251UV24I 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 X9251UV24I belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in precision analog circuits requiring nonvolatile calibration, low power, and robust digital interface control.

FAQ

What is the exact end-to-end resistance and tolerance of the X9251UV24I?

The X9251UV24I has a nominal end-to-end resistance of 50kΩ with a tolerance of ±20%, as specified in the Analog Characteristics table of FN8166 Rev 7.00. This value applies to all four integrated DCPs and is measured under recommended operating conditions.

Does the X9251UV24I support true SPI mode 0 (CPOL=0, CPHA=0)?

Yes, the X9251UV24I operates in SPI mode 0: data is sampled on the rising edge of SCK and shifted out on the falling edge. The SO output is clocked on SCK falling edge, and SI input is latched on SCK rising edge - matching standard mode 0 timing requirements.

How many nonvolatile data registers does each DCP in the X9251UV24I have?

Each of the four DCPs in the X9251UV24I has four independent 8-bit nonvolatile Data Registers (DR#0 through DR#3), enabling storage of up to four distinct wiper positions or system parameters per channel - all retaining data for 100 years.

Can the X9251UV24I operate from a 3.3V supply?

Yes, the X9251UV24I supports VCC from 2.7V to 5.5V, fully covering 3.3V operation. At 3.3V, wiper resistance is 300Ω typical (per datasheet Table on Page 12), and all SPI timing parameters remain valid per AC Timing specifications.

What happens to wiper position during power-up of the X9251UV24I?

At power-up, the X9251UV24I automatically loads the contents of DR00, DR10, DR20, and DR30 into the corresponding Wiper Counter Registers (WCR0–WCR3), restoring the last stored default wiper positions - ensuring repeatable analog behavior without host intervention.