Renesas X9401WV24IZ-2.7

Overview

X9401WV24IZ-2.7 from Intersil is a quad, 64-tap, digitally controlled potentiometer (XDCP™) with SPI interface, 10 kΩ end-to-end resistance, 150 Ω typical wiper resistance, and 2.7 V to 5.5 V supply operation - used for precision analog trimming in voltage regulators, amplifier gain control, and offset adjustment circuits.

For engineers reviewing the X9401WV24IZ-2.7 datasheet, X9401WV24IZ-2.7 pinout, X9401WV24IZ-2.7 application, or X9401WV24IZ-2.7 equivalent, key selection considerations include nonvolatile wiper position storage, four independent 6-bit data registers per pot, hardware write protection (WP), HOLD functionality for SPI pause, and TSSOP-24 Pb-free RoHS-compliant packaging.

Technical Context

The X9401WV24IZ-2.7 implements four independent resistor arrays-each with 63 segments and 64 tap points-controlled by volatile Wiper Counter Registers (WCR) and backed by four nonvolatile 6-bit Data Registers (DR0–DR3) per pot. It uses standard SPI timing (up to 2 MHz) with CS, SCK, SI, and SO signals, plus address pins A0/A1 supporting up to four devices on one bus.

Each pot supports three-terminal potentiometer or two-terminal variable resistor configurations. Wiper position is updated via Write WCR, XFR DR→WCR, or real-time Increment/Decrement commands. Power-up loads DR0 into the corresponding WCR, enabling deterministic startup behavior without host intervention.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (4.4 mm wide), Pb-free, RoHS-compliant (MDP0044 drawing). Pin-compatible with SOIC-24 variant but smaller footprint.

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 X9401WV24IZ-2.7 uniquely delivers quad-channel operation with per-pot nonvolatile data registers, hardware write protection, and SPI HOLD - making it optimal for systems requiring robust, field-updatable analog calibration with minimal host overhead.

Availability

X9401WV24IZ-2.7 is available at Aetrix Electronics and suitable for voltage regulator trimming, programmable gain amplification, comparator hysteresis control, and active filter tuning requiring stable component supply across industrial temperature ranges (-40°C to +85°C).

Supply support for X9401WV24IZ-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

Intersil Corporation is a provider of precision analog and power management ICs, now part of Renesas Electronics, with focus on industrial, infrastructure, and high-reliability applications.

The X9401 product line was designed for digitally reconfigurable analog signal conditioning - targeting applications where mechanical potentiometers fail due to wear, vibration, or inaccessible calibration.

FAQ

What is the minimum supply voltage required for reliable operation of the X9401WV24IZ-2.7?

The X9401WV24IZ-2.7 operates reliably from 2.7 V to 5.5 V. Below 2.7 V, internal logic and EEPROM write operations may become unstable, and the datasheet specifies no guaranteed performance. At 2.7 V, standby current remains under 3 µA and active current stays below 700 µA, confirming full functionality across the rated range. The X9401WV24IZ-2.7 is explicitly characterized for this lower limit, unlike earlier X9401 variants with 5 V-only operation.

Does the X9401WV24IZ-2.7 retain its wiper position after power cycling?

Yes - the X9401WV24IZ-2.7 automatically loads the contents of Data Register 0 (DR0) into each pot's volatile Wiper Counter Register (WCR) at power-up. Since DR0 is nonvolatile and retains data for 100 years, the last stored wiper position is restored without host intervention. This behavior is guaranteed across the full -40°C to +85°C temperature range and requires no external capacitor or reset sequencing.

Can the X9401WV24IZ-2.7 be used as a two-terminal variable resistor?

Yes - the X9401WV24IZ-2.7 supports two-terminal operation by connecting either VH or VL to VW (wiper), leaving the other end open. In this mode, resistance varies from near-zero (WCR = 0x00 or 0x3F) to RTOTAL (10 kΩ). The 150 Ω typical wiper resistance contributes directly to minimum on-resistance, making it suitable for current-sensing or bias-current adjustment where sub-kΩ variation is acceptable.

How does the HOLD pin function during SPI communication with the X9401WV24IZ-2.7?

The HOLD pin pauses an ongoing SPI transaction without resetting internal state: it must be driven LOW while SCK is LOW, and resumed by driving HOLD HIGH while SCK remains LOW. During hold, SI, SO, and SCK are ignored; CS stays active. This allows microcontrollers to service higher-priority interrupts mid-transfer. The X9401WV24IZ-2.7 resumes exactly where it left off - critical for multi-byte register writes or reads.

Is the X9401WV24IZ-2.7 pin-compatible with the SOIC-packaged X9401WS24IZ-2.7T1?

No - the X9401WV24IZ-2.7 uses a 24-lead TSSOP package (MDP0044), while the X9401WS24IZ-2.7T1 uses a 24-lead SOIC package (M24.3). Although both share identical pin functions and ordering suffix "-2.7", their footprints differ: TSSOP has 0.65 mm pitch and 4.4 mm body width; SOIC has 1.27 mm pitch and 7.5 mm body width. PCB layout must match the specific package; they are not drop-in replacements.