Renesas X9251TS24-2.7T1

Overview

X9251TS24-2.7T1 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 nonvolatile data registers-used for precision gain control, DC bias trimming, and sensor signal conditioning in embedded analog systems.

For engineers reviewing the X9251TS24-2.7T1 datasheet, X9251TS24-2.7T1 pinout, X9251TS24-2.7T1 application, or X9251TS24-2.7T1 equivalent, this page delivers verified electrical specs, validated SPI timing, confirmed TSSOP-24 package mapping, wiper resistance behavior at 3V/5V, and real-world use cases in voltage regulator feedback, audio volume control, and Wheatstone bridge calibration.

Technical Context

The X9251TS24-2.7T1 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 (DR00–DR33). Wiper position is updated via SPI write, transfer, or increment/decrement commands, with power-up loading from DR#0.

It implements resistor arrays with CMOS switch matrices, supporting both three-terminal potentiometer and two-terminal variable resistor configurations. The SPI interface complies with standard mode-0 timing (CPOL=0, CPHA=0), includes HOLD and hardware write-protect (WP), and supports device addressing via A0/A1 pins.

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 AD5204BRUZ10 and MCP42050-I/ST, the X9251TS24-2.7T1 uniquely combines quad 256-tap resolution, SPI HOLD functionality, and four nonvolatile registers per pot-making it optimal for systems requiring high-precision, multi-point calibration and robust field updates.

Availability

X9251TS24-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, and audio system design requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for X9251TS24-2.7T1 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 specializing in microcontrollers, analog, and power management solutions for automotive, industrial, and IoT applications.

The X9251 series was designed as a drop-in upgrade to mechanical potentiometers in precision analog control systems-emphasizing nonvolatile configuration storage, low-power operation, and robust SPI-based reprogramming.

FAQ

What is the guaranteed wiper resistance specification for X9251TS24-2.7T1 at 3.3V operation?

The X9251TS24-2.7T1 specifies wiper resistance of 300Ω typical at V_CC = 3V, with no min/max limits provided in the datasheet. This value directly affects loading error in voltage divider configurations; for critical applications, verify actual performance under load using the device's RH/RW/RL terminals and expected current levels. The X9251TS24-2.7T1 wiper resistance decreases to 220Ω typical at 5V, improving accuracy in higher-voltage analog paths.

Does X9251TS24-2.7T1 support true SPI mode-0 (CPOL=0, CPHA=0) timing?

Yes, the X9251TS24-2.7T1 fully supports SPI mode-0: data is sampled on the rising edge of SCK (CPHA=0) and clocked out on the falling edge (CPOL=0). Its tSU (50ns setup) and tH (50ns hold) requirements are met by most 32-bit MCUs running SPI at ≤2MHz. The X9251TS24-2.7T1 also tolerates slower edges (tRI/tFI ≤2µs), easing layout in noisy industrial environments.

How does the power-up sequence affect wiper initialization in X9251TS24-2.7T1?

At power-up, the X9251TS24-2.7T1 automatically loads the contents of DR00, DR10, DR20, and DR30 into WCR0–WCR3 respectively-regardless of prior wiper positions. This ensures repeatable startup behavior. To guarantee correct loading, V_CC must stabilize before issuing any SPI command; tPUR = 1ms and tPUW = 50ms minimum delays apply. The X9251TS24-2.7T1 does not require external reset sequencing.

Can X9251TS24-2.7T1 be used in a two-terminal variable resistor configuration?

Yes, the X9251TS24-2.7T1 supports two-terminal operation by connecting either RH or RL to the wiper (RW) externally-effectively shorting one end of the resistor array. This configuration is commonly used for programmable current limiting or gain-setting resistors. In such use, the X9251TS24-2.7T1 maintains its 50kΩ total resistance rating and 256-step resolution, with wiper resistance contributing directly to the effective resistance value.

What happens to nonvolatile data registers during a solder reflow cycle?

The X9251TS24-2.7T1's nonvolatile Data Registers retain their contents through standard Pb-free reflow profiles (peak ≤260°C, per TB493), as its EEPROM cells are rated for >100,000 write cycles and 100-year data retention at +85°C. No data loss occurs during assembly. However, the X9251TS24-2.7T1 WP pin must remain HIGH during reflow to prevent unintended writes triggered by noise on SI/SCK lines-recommended practice is to tie WP to V_CC via 10kΩ pull-up.