Renesas X9251TP24I

Overview

X9251TP24I from Renesas Electronics is a quad digitally controlled potentiometer (XDCP™) integrating four independent 256-tap, 50kΩ end-to-end resistance DCPs on a single CMOS IC. It operates from 2.7V to 5.5V, features SPI interface control, nonvolatile data register storage (100-year retention), and <5µA standby current. It serves as programmable voltage dividers or variable resistors in precision analog trimming applications such as sensor signal conditioning and DC bias adjustment.

For engineers reviewing the X9251TP24I datasheet, X9251TP24I pinout, X9251TP24I application, or X9251TP24I equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in Renesas FN8166 Rev 7.00 documentation and official parametric data.

Technical Context

The X9251TP24I implements four independent digital potentiometers using resistor arrays and CMOS switches, 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 power-up loading DR#0 into the corresponding WCR.

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) functionality. All potentiometers share one SPI bus but are individually addressable by DCP selection bits (P1/P0) in instruction bytes.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm width), RoHS-compliant, Pb-free (e3 termination).

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 X9251TP24I uniquely combines quad 50kΩ channels, SPI + hardware WP/HOLD, and full DR↔WCR transfer flexibility - making it optimal for compact, high-reliability analog configuration in industrial and communications equipment.

Availability

X9251TP24I is available at Aetrix Electronics and suitable for precision analog trimming, sensor calibration, and programmable power supply applications requiring stable component supply, long-term data retention, and industrial temperature operation (-40°C to +85°C).

Supply support for X9251TP24I 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 markets.

The X9251TP24I belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in high-reliability analog systems requiring programmable, nonvolatile resistance tuning.

FAQ

What is the operating voltage range for the X9251TP24I?

The X9251TP24I operates from 2.7V to 5.5V, supporting both 3.3V and 5V system rails. Its absolute maximum VCC rating is +7V relative to VSS, and proper power sequencing requires VCC ≥ VH, VL, and VW at all times. This range enables direct integration into mixed-signal systems without level-shifting circuitry.

How does the X9251TP24I store wiper positions across power cycles?

The X9251TP24I stores wiper positions in four nonvolatile Data Registers (DR0–DR3) per DCP, with guaranteed 100-year data retention and 100,000 write cycles. At power-up, each DCP loads DR#0 into its volatile Wiper Counter Register (WCR), restoring the last-saved default setting automatically without host intervention.

Can multiple X9251TP24I devices share the same SPI bus?

Yes - the X9251TP24I supports multi-drop SPI via hardware address pins A0 and A1, which configure the two LSBs of the slave address. Up to four devices can coexist on one bus with unique addresses (00, 01, 10, 11), eliminating the need for individual chip-select lines beyond the standard CS signal.

What is the function of the HOLD pin on the X9251TP24I?

The HOLD pin on the X9251TP24I pauses ongoing SPI transactions without resetting the command sequence. When asserted LOW while SCK is LOW, it freezes data transfer; returning HOLD HIGH resumes communication. This enables time-critical host operations (e.g., interrupt servicing) without losing bus state - a feature absent in many competing DCPs.

Does the X9251TP24I support both three-terminal potentiometer and two-terminal rheostat configurations?

Yes - each of the four DCPs in the X9251TP24I can be wired as either a three-terminal potentiometer (RH–RW–RL) for voltage division or a two-terminal variable resistor (RW–RH or RW–RL) for current limiting or bias adjustment. The datasheet confirms compatibility with both topologies across all operating conditions.