Renesas X9251TS24-2.7

Overview

X9251TS24-2.7 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 24-lead TSSOP package. It functions as four independent programmable resistors for precision analog trimming in voltage amplifier gain control, sensor signal conditioning, and DC bias adjustment.

For engineers reviewing the X9251TS24-2.7 datasheet, X9251TS24-2.7 pinout, X9251TS24-2.7 application, or X9251TS24-2.7 equivalent, this device supports volatile wiper position control and nonvolatile storage of up to four wiper settings per channel - critical for power-up repeatability, audio volume calibration, and offset correction in industrial sensor interfaces.

Technical Context

The X9251TS24-2.7 integrates four independent CMOS-switched resistor arrays, 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 real-time increment/decrement commands, enabling fine-grained analog tuning without host MCU intervention.

Its SPI interface complies with standard mode-0 timing (CPOL=0, CPHA=0), supports device addressing via A0/A1 pins, and includes hardware write protection (WP) and serial bus hold (HOLD) for multi-device bus arbitration. Power-up loads DR#0 into each WCR, ensuring deterministic startup behavior across temperature ranges.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free, MSL3 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/ST, the X9251TS24-2.7 uniquely combines quad-channel density, hardware write protection, SPI hold support, and real-time increment/decrement - making it optimal for embedded systems requiring field-serviceable calibration and robust bus arbitration.

Availability

X9251TS24-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, audio equipment manufacturing, and DC-DC converter design requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for X9251TS24-2.7 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 mixed-signal solutions for automotive, industrial, and IoT applications.

The X9251 product line delivers digitally programmable analog front-ends for precision trimming, calibration, and adaptive biasing - designed specifically for systems needing nonvolatile parameter storage and SPI-based configurability without external EEPROM.

FAQ

What is the operating voltage range for the X9251TS24-2.7?

The X9251TS24-2.7 operates from 2.7V to 5.5V on a single supply, as confirmed in the Absolute Maximum Ratings table (Page 12) and Ordering Information (Page 3). This range supports direct connection to 3.3V and 5V logic domains without level-shifting circuitry. Operation below 2.7V is not guaranteed and may result in unreliable SPI communication or incomplete nonvolatile writes.

How many wiper positions does the X9251TS24-2.7 support per channel?

The X9251TS24-2.7 supports 256 discrete wiper positions per channel, corresponding to an 8-bit Wiper Counter Register (WCR) as defined in Table 1 (Page 5) and confirmed by the "256 resistor taps" feature listing (Page 1). Each position provides 0.4% resolution relative to full-scale resistance, enabling precise analog adjustments in applications like sensor offset correction.

Does the X9251TS24-2.7 retain wiper settings after power loss?

The X9251TS24-2.7 does not retain wiper positions directly after power loss because the Wiper Counter Register (WCR) is volatile. However, at power-up, it automatically loads the value from Data Register zero (DR00–DR30) into each respective WCR, as stated in the Functional Description (Page 1) and Principles of Operation (Page 5). Those DR values are nonvolatile and retain settings for 100 years.

Can the X9251TS24-2.7 be used as a two-terminal variable resistor?

Yes, the X9251TS24-2.7 can be configured as a two-terminal variable resistor by connecting either RH or RL to the wiper (RW) terminal, as shown in Application Circuits (Page 17). This configuration uses only two pins per DCP and is explicitly supported in the "Circuit Level Applications" list (Page 2), including "Trim the resistance in Wheatstone bridge circuits" and "Set the output voltage of a voltage regulator".

What is the maximum SPI clock frequency supported by the X9251TS24-2.7?

The X9251TS24-2.7 supports a maximum SPI clock frequency of 2MHz, as specified in the AC Timing table (Page 14, fSCK parameter). This limit applies across the full 2.7V–5.5V VCC range and ensures reliable data capture on the rising edge of SCK and valid output on the falling edge, per the Serial Interface description (Page 6).