Renesas ISL23425WFRUZ-T7A

Overview

ISL23425WFRUZ-T7A from Renesas (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer (DCP) with SPI interface, 10kΩ total resistance per channel, 1.7V–5.5V analog supply (VCC), and independent 1.2V–5.5V logic supply (VLOGIC). It operates across –40°C to +125°C and is used in precision trimming of sensor circuits and gain adjustment in battery-powered instrumentation.

For engineers reviewing the ISL23425WFRUZ-T7A datasheet, ISL23425WFRUZ-T7A pinout, ISL23425WFRUZ-T7A application, or ISL23425WFRUZ-T7A equivalent, key selection criteria include its 10kΩ resistance option, µTQFN-16 package, wiper settling time of 300 ns, shutdown mode with end-to-end open circuit, and guaranteed monotonicity in both voltage divider and rheostat modes.

Technical Context

The ISL23425WFRUZ-T7A integrates two independent DCP cores on a monolithic CMOS IC, each with an 8-bit volatile Wiper Register (WR0/WR1) directly accessible via SPI Mode 0. Wiper position is updated on CS rising edge with 300 ns large-signal settling time, and power-on defaults to mid-scale (128 decimal).

Its dual-rail architecture separates analog (VCC) and digital (VLOGIC) supplies, enabling direct interfacing with 1.2V microcontrollers without level shifters. Shutdown mode disconnects resistor arrays and shorts each RW to RL through a 2kΩ internal path, reducing leakage and isolating signal paths.

Key Specifications

Pinout & Package

ISL23425WFRUZ-T7A is packaged in a 16-lead 2.6 mm × 1.8 mm µTQFN (L16.2.6x1.8A), RoHS-compliant, with exposed thermal pad. Pin 1 marked by dot; pin 7 is NC (not connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ10 and MCP42010-I/ST, the ISL23425WFRUZ-T7A uniquely delivers dual-channel operation with independent logic/analog rails, guaranteed monotonicity, and a true shutdown state-making it optimal for high-reliability, multi-parameter calibration in harsh environments.

Availability

ISL23425WFRUZ-T7A is available at Aetrix Electronics and suitable for power supply margining, sensor trimming, battery-powered instrument gain control, and RF amplifier bias compensation requiring stable component supply across extended temperature ranges.

Supply support for ISL23425WFRUZ-T7A 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 Corporation acquired Intersil in 2017 and maintains full technical and supply chain responsibility for the ISL23425 family.

The ISL23425 product line was designed for precision analog trimming in space-constrained, low-power, and high-temperature applications-emphasizing dual-channel integration, rail-to-rail compatibility, and robust digital interface resilience.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL23425WFRUZ-T7A?

The ISL23425WFRUZ-T7A has a total resistance tolerance of ±2% and an end-to-end temperature coefficient of 125 ppm/°C (typical) over –40°C to +125°C. These values are specified for the 10kΩ resistance option (W suffix) and are measured across the RH–RL terminals with wiper unconnected. The ratiometric temperature coefficient (TCV) is 8 ppm/°C at tap 0x80, ensuring stable voltage division ratios across temperature.

Does the ISL23425WFRUZ-T7A retain wiper settings after power cycling?

No, the ISL23425WFRUZ-T7A uses volatile Wiper Registers (WR0/WR1). Upon power-up, both wipers reset to mid-scale (128 decimal / 0x80). Host firmware must reinitialize the registers via SPI after each power-on event. This eliminates EEPROM wear concerns but requires boot-time calibration routines in the system controller.

Can the ISL23425WFRUZ-T7A be used in rheostat mode with only two terminals?

Yes, the ISL23425WFRUZ-T7A supports true rheostat configuration: connect either RH or RL to the signal path and leave the other floating, using RW as the variable terminal. Its datasheet guarantees monotonicity and specifies RINL (±2.0 LSB) and RDNL (±1 LSB) for this mode at VCC = 2.7–5.5V, making it suitable for programmable gain and bias networks.

What is the maximum SPI clock frequency supported by the ISL23425WFRUZ-T7A?

The ISL23425WFRUZ-T7A supports up to 5 MHz SCK frequency when VLOGIC ≥ 1.7V. At lower logic voltages (1.2V–1.6V), the maximum SCK frequency is reduced to 1 MHz to ensure reliable timing margins. All SPI timing parameters-including tSU, tH, tWH, and tWL-are fully characterized and guaranteed across the full operating temperature range.

How does the shutdown mode function in the ISL23425WFRUZ-T7A?

In shutdown mode (enabled via SHDN bit in ACR), each DCP channel is forced into an end-to-end open circuit, and each RW terminal is internally connected to its corresponding RL terminal through a 2kΩ resistor. This isolates the analog signal path while preserving the last wiper register value. Exit from shutdown occurs on CS rising edge, with wiper recall completed within 1.5 µs.