Renesas X9251UV24IZ

Overview

X9251UV24IZ from Renesas Electronics is a quad digitally controlled potentiometer (XDCP™) IC with 256-tap resolution, SPI interface, 50kΩ end-to-end resistance, -40°C to +85°C industrial temperature range, and 24-lead TSSOP package. It functions as four independent programmable resistive dividers for precision analog control in embedded signal conditioning and biasing circuits.

For engineers reviewing the X9251UV24IZ datasheet, X9251UV24IZ pinout, X9251UV24IZ application, or X9251UV24IZ equivalent, this page delivers verified electrical specs, validated SPI timing, confirmed nonvolatile register behavior, wiper resistance at 5V, and industrial-grade thermal performance - all critical for volume production of sensor interfaces, audio gain stages, and voltage regulator feedback networks.

Technical Context

The X9251UV24IZ implements four independent DCP cores using resistor ladders and CMOS switches, each controlled by an 8-bit volatile Wiper Counter Register (WCR) and backed by four 8-bit nonvolatile Data Registers (DR00–DR33). Its SPI interface supports three-byte read/write operations, two-byte transfer commands, and real-time increment/decrement mode for fine-grained wiper adjustment.

Power-up behavior is deterministic: each WCR loads the value from its default DR#0 register. Hardware write protection (WP pin) blocks nonvolatile writes, while HOLD enables pause/resume of ongoing SPI sequences without reset. The device operates across 2.7V–5.5V and draws ≤5µA in standby.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4mm wide), RoHS-compliant, Pb-free, M24.173 drawing. Pin 1 marked with dot; pins 6 and 19 are NC (no connect) and must be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP42050-I/SL, the X9251UV24IZ offers superior industrial reliability (100k write cycles, 100-year retention), dedicated HOLD functionality for deterministic SPI sequencing, and hardware write protection - making it preferred for mission-critical embedded calibration in automotive and industrial equipment.

Availability

X9251UV24IZ is available at Aetrix Electronics and suitable for audio gain control, voltage regulator feedback, sensor signal conditioning, and RF bias point calibration requiring stable component supply across industrial temperature ranges and long lifecycle support.

Supply support for X9251UV24IZ 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 ICs for automotive, industrial, and IoT applications.

The X9251UV24IZ belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in high-reliability, programmable analog signal conditioning systems.

FAQ

What is the operating temperature range for the X9251UV24IZ?

The X9251UV24IZ is rated for industrial operation from -40°C to +85°C, as confirmed in the ordering information table on page 3 of FN8166 Rev 7.00. This range applies to all electrical specifications including wiper resistance, SPI timing, and nonvolatile write endurance. It is distinct from the commercial-grade X9251UV24Z (0°C to +70°C) and supports deployment in harsh environments such as motor control enclosures and outdoor instrumentation.

Does the X9251UV24IZ support true 3-wire SPI communication?

Yes, the X9251UV24IZ supports true 3-wire SPI mode: SO and SI can be tied together since both are three-state outputs, reducing host pin count. The device uses standard SPI phase/polarity (CPOL=0, CPHA=0), with data latched on the rising edge of SCK and shifted out on the falling edge. HOLD and WP pins remain functional in this configuration, and CS must still be used for device selection.

How many nonvolatile memory locations does each potentiometer have in the X9251UV24IZ?

Each of the four potentiometers in the X9251UV24IZ has four independent 8-bit nonvolatile Data Registers (DR#0 through DR#3), totaling 16 nonvolatile registers. DR#0 is loaded into the corresponding Wiper Counter Register at power-up. All DRs support direct read/write and transfer to/from the WCR, with 100,000 write cycles and 100-year data retention guaranteed.

What is the maximum allowable voltage on RH/RL/RW pins relative to VSS for the X9251UV24IZ?

The absolute maximum rating specifies that the voltage on any RH, RL, or RW pin must stay within VSS to VCC (i.e., ΔV = |VH − VL| ≤ 5.5V), and VCC must always be ≥ VH, VL, and VW. This means RH/RL/RW pins may swing up to the VCC rail but must never exceed it - critical when using the device in level-shifting or AC-coupled configurations where external bias could violate this constraint.

Can the X9251UV24IZ perform simultaneous wiper updates across all four potentiometers?

Yes, the X9251UV24IZ supports global transfer instructions: "Global XFR Data Register to Wiper Counter Register" and "Global XFR Wiper Counter Register to Data Register" update all four DCPs in a single SPI transaction. These commands use fixed P1/P0 bits (00) and execute atomically, ensuring synchronized calibration across multiple channels without software coordination overhead.