Renesas ISL23325WFRUZ-T7A

Overview

ISL23325WFRUZ-T7A from Renesas (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer with I²C interface, designed for precision analog trimming in low-voltage systems. It features 10kΩ total resistance per channel, ±2% end-to-end tolerance, 70Ω typical wiper resistance at 3.3V, and operates from 1.7V to 5.5V VCC and 1.2V to 5.5V VLOGIC - enabling direct interfacing with 1.2V logic without level shifters. It is used in battery-powered sensor calibration and RF bias compensation circuits.

For engineers reviewing the ISL23325WFRUZ-T7A datasheet, ISL23325WFRUZ-T7A pinout, ISL23325WFRUZ-T7A application, or ISL23325WFRUZ-T7A equivalent, key selection considerations include its 16-lead µTQFN package, dual-channel monotonicity (±0.4 LSB DNL), -40°C to +125°C extended temperature range, shutdown mode with open-circuit end-to-end isolation, and guaranteed ratiometric temperature coefficient of 8 ppm/°C at mid-scale.

Technical Context

The ISL23325WFRUZ-T7A integrates two independent 256-tap DCP cores on a monolithic CMOS die, each with a volatile 8-bit Wiper Register (WR0/WR1) directly accessible via I²C. Its "make-before-break" wiper switching ensures glitch-free transitions, and power-on reset initializes both wipers to mid-scale (128). The VLOGIC pin decouples logic supply from analog VCC, supporting mixed-voltage I²C buses down to 1.2V.

Each DCP supports voltage-divider and rheostat modes, with verified monotonicity, ±0.5 LSB INL (voltage divider), and 1200 kHz -3dB bandwidth at mid-scale for 10kΩ configuration. Shutdown mode disconnects internal resistors and connects RW to RL through a 2kΩ resistor, reducing leakage and enabling system-level power gating.

Key Specifications

Pinout & Package

ISL23325WFRUZ-T7A is housed in a 16-lead 2.6mm × 1.8mm µTQFN package (RoHS-compliant, e4 NiPdAu termination), optimized for space-constrained PCB layouts and thermal performance (θJC = 64°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/MS, the ISL23325WFRUZ-T7A uniquely combines dual-channel integration, 1.2V logic support, shutdown isolation, and extended temperature performance - making it optimal for space- and power-constrained embedded systems demanding robust analog programmability.

Availability

ISL23325WFRUZ-T7A is available at Aetrix Electronics and suitable for power supply margining, sensor trimming, RF bias compensation, and battery-powered instrument gain control requiring stable component supply across automotive, industrial, and medical device production cycles.

Supply support for ISL23325WFRUZ-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 acquired Intersil in 2017 and continues to manufacture and support its precision analog portfolio, including digitally controlled potentiometers.

The ISL23325WFRUZ-T7A belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered for high-accuracy, low-power analog parameter adjustment in battery-operated and thermally demanding systems.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL23325WFRUZ-T7A?

The ISL23325WFRUZ-T7A has a ±2% end-to-end resistance tolerance and a 125 ppm/°C end-to-end temperature coefficient (TCR) for its 10kΩ configuration. Its ratiometric temperature coefficient (TCv) is specified at 8 ppm/°C when the wiper register is set to 80h - critical for maintaining voltage-divider accuracy across temperature in sensor interfaces.

Does the ISL23325WFRUZ-T7A retain wiper settings during power cycling?

No - the ISL23325WFRUZ-T7A uses volatile wiper registers (WR0 and WR1). Upon power-up, both wipers reset to mid-scale (tap 128, hex 80h). To restore custom positions, the host controller must reprogram the registers via I²C after each power-on sequence.

Can the ISL23325WFRUZ-T7A operate with different voltages on VCC and VLOGIC?

Yes - VCC (1.7V–5.5V) and VLOGIC (1.2V–5.5V) are fully independent supplies. This allows the ISL23325WFRUZ-T7A to interface directly with a 1.2V microcontroller I²C bus while powering the DCP core from a 3.3V or 5V analog rail - eliminating level-shifters and associated board area.

What is the maximum I²C clock frequency supported by the ISL23325WFRUZ-T7A?

The ISL23325WFRUZ-T7A supports standard and fast-mode I²C up to 400kHz. Timing parameters including tLOW (≥1300ns), tHIGH (≥600ns), and tSU:DAT (≥100ns) are guaranteed across the full VLOGIC range (1.2V–5.5V), ensuring reliable communication even at ultra-low logic voltages.

How does shutdown mode affect the ISL23325WFRUZ-T7A's terminal connections?

In shutdown mode (SHDN bit = 0 in ACR), each DCP channel is forced into an end-to-end open circuit - disconnecting RH and RL from the internal resistor string. Simultaneously, RW is internally connected to RL via a 2kΩ resistor, providing a defined low-impedance path while isolating the wiper from analog signal paths.