Renesas X9251UV24-2.7

Overview

X9251UV24-2.7 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 24-pin TSSOP package. It functions as four independent programmable resistors or voltage dividers in analog signal conditioning, gain/offset trimming, and DC bias control circuits.

For engineers reviewing the X9251UV24-2.7 datasheet, X9251UV24-2.7 pinout, X9251UV24-2.7 application, or X9251UV24-2.7 equivalent, this device supports precise digital calibration of amplifier gain, sensor reference voltages, audio volume, and regulator output settings without mechanical wear or manual adjustment.

Technical Context

The X9251UV24-2.7 integrates four monolithic CMOS DCPs, each with an 8-bit volatile Wiper Counter Register (WCR) and four nonvolatile Data Registers (DR0–DR3). Wiper position is set via SPI write, transfer, or real-time increment/decrement commands - all operating at up to 2MHz clock frequency.

Each DCP implements resistor ladder + CMOS switch architecture with 0.4% resolution, ±300ppm/°C total resistance tempco, and <5µA standby current. Hardware write protection (WP) and HOLD pause functionality ensure robust serial bus control during system-level configuration.

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 MCP42050-I/SL, the X9251UV24-2.7 uniquely delivers quad-channel density, hardware write protection, and SPI-based real-time wiper adjustment - making it optimal for compact, field-calibratable analog subsystems requiring long-term parameter retention.

Availability

X9251UV24-2.7 is available at Aetrix Electronics and suitable for audio volume control, sensor signal conditioning, voltage regulator feedback, RF power amplifier bias, and industrial calibration systems requiring stable component supply and guaranteed long-term availability.

Supply support for X9251UV24-2.7 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 IoT markets.

The X9251UV24-2.7 belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in precision analog calibration, sensor interfacing, and programmable power management applications.

FAQ

What is the minimum supply voltage required for reliable operation of the X9251UV24-2.7?

The X9251UV24-2.7 operates reliably from 2.7V to 5.5V, as specified in its ordering suffix "-2.7". At 2.7V, wiper resistance is 300Ω typical and SPI interface remains functional up to 2MHz. Below 2.7V, the internal charge pump may fail to program nonvolatile registers, and wiper positioning becomes undefined. Always ensure VCC ≥ VH, VL, and VW during operation.

How does the X9251UV24-2.7 retain wiper settings after power cycling?

The X9251UV24-2.7 loads the content of Data Register 0 (DR00, DR10, DR20, DR30) into each corresponding Wiper Counter Register (WCR0–WCR3) at power-up. Since DR#0 is nonvolatile with 100-year retention and 100,000 write cycles, the last-saved calibration values persist across power cycles without external memory or host intervention.

Can multiple X9251UV24-2.7 devices share the same SPI bus?

Yes - the X9251UV24-2.7 supports up to four devices on one SPI bus using the A0 and A1 address pins. Each device's slave address is formed by ID[3:0]=0101 plus A1/A0 logic levels, allowing independent selection via CS while sharing SI, SO, SCK, and HOLD. WP and HOLD must be individually wired per device.

What is the maximum allowable voltage across RH and RL terminals of the X9251UV24-2.7?

The absolute maximum voltage difference between any RH and RL pin is 5.5V (ΔV = |VH − VL| ≤ 5.5V), per Absolute Maximum Ratings. Exceeding this risks permanent damage to the internal resistor ladder or CMOS switches. For safe operation, ensure VH and VL stay within VSS to VCC, and avoid applying external bias beyond the supply rails.

Does the X9251UV24-2.7 support real-time wiper adjustment without issuing full SPI commands?

Yes - the X9251UV24-2.7 implements an Increment/Decrement command that enables real-time wiper stepping via SI logic level during active SCK pulses. After issuing the command, each SCK pulse with SI=HIGH moves the selected wiper toward RH; SI=LOW moves it toward RL - ideal for knob-like interactive control without CPU overhead.