Renesas X9421WV14IZ-2.7T1

Overview

X9421WV14IZ-2.7T1 from Intersil is a single-channel, SPI-interface digitally controlled potentiometer (XDCP™) with 64-tap resolution, 10 kΩ end-to-end resistance, 2.7 V to 5.5 V supply operation, and nonvolatile storage of four wiper positions. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor in analog signal conditioning circuits requiring precise, repeatable resistance adjustment.

For engineers reviewing the X9421WV14IZ-2.7T1 datasheet, X9421WV14IZ-2.7T1 pinout, X9421WV14IZ-2.7T1 application, or X9421WV14IZ-2.7T1 equivalent, key selection criteria include its 14-pin TSSOP package, SPI-compatible serial interface with HOLD/CS/WR protection, 150 Ω typical wiper resistance at 5 V, 100-year data retention, and power-on recall from DR0 register.

Technical Context

The X9421WV14IZ-2.7T1 implements a monolithic CMOS 63-resistor-segment array with CMOS switches controlled by a volatile 6-bit Wiper Counter Register (WCR), enabling discrete tap selection via SPI commands. Its architecture supports direct write/read of WCR and four nonvolatile 6-bit Data Registers (DR0–DR3), with transfer operations between registers and hardware write protection via the WP pin.

It operates across 0°C to +70°C, uses standard SPI timing (f_SCK ≤ 2 MHz), and features power-up automatic loading of DR0 into WCR. The device supports increment/decrement mode for real-time fine-tuning and includes status monitoring via the WIP bit during nonvolatile writes lasting up to 10 ms.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4 mm wide), RoHS-compliant, Pb-free matte tin termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X9421WV14IZ-2.7T1, ISL22416 offers higher resolution and impedance but lacks power-on DR0 recall, while ISL22419 matches resistance and package but replaces SPI with I²C-requiring firmware and layout changes despite physical similarity.

Availability

X9421WV14IZ-2.7T1 is available at Aetrix Electronics and suitable for audio volume control, RF bias tuning, precision op-amp offset trimming, and programmable reference generation requiring stable component supply and long-term calibration retention.

Supply support for X9421WV14IZ-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

Intersil (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9421 product line delivers digitally controlled potentiometers designed for replacing mechanical trimmers in calibration-critical analog circuits where nonvolatile storage, SPI compatibility, and low-noise performance are essential.

FAQ

What is the supply voltage range supported by the X9421WV14IZ-2.7T1?

The X9421WV14IZ-2.7T1 operates from 2.7 V to 5.5 V, making it compatible with both 3.3 V and 5 V logic systems. This range is explicitly defined in the Absolute Maximum Ratings table of the FN8196 datasheet and validated across commercial temperature (0°C to +70°C). Operation outside this window may cause functional failure or reduced data retention.

Does the X9421WV14IZ-2.7T1 retain its wiper setting after power cycling?

Yes-the X9421WV14IZ-2.7T1 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) at power-up. This power-on recall feature ensures the last-saved calibration point is restored without host intervention, provided DR0 was previously written with the desired value.

How many nonvolatile memory registers does the X9421WV14IZ-2.7T1 include?

The X9421WV14IZ-2.7T1 includes four 6-bit nonvolatile Data Registers (DR0–DR3), each capable of storing a wiper position or system parameter. These registers support up to 100,000 write cycles and retain data for 100 years at +25°C, as specified in the Endurance and Data Retention section of FN8196 Rev. 1.00.

What package type is used for the X9421WV14IZ-2.7T1?

The X9421WV14IZ-2.7T1 is housed in a 14-lead TSSOP package (4.4 mm body width), Pb-free and RoHS-compliant, with matte tin (e3) termination. Pin assignments and mechanical dimensions are detailed on page 4 of FN8196, confirming compatibility with standard 0.65 mm pitch PCB footprints.

Can the X9421WV14IZ-2.7T1 be used in a two-terminal (rheostat) configuration?

Yes-the X9421WV14IZ-2.7T1 supports both three-terminal potentiometer and two-terminal variable resistor (rheostat) modes. In rheostat mode, RH/VH and RW/VW are used as the two terminals, while RL/VL is left unconnected or tied to RW/VW. This configuration is explicitly listed in the Description section of FN8196 and validated in Circuit Level Applications.