Renesas ISL23425WFRUZ-TK

Overview

ISL23425WFRUZ-TK from Renesas Electronics (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer (DCP) with SPI interface, 10kΩ total resistance, 16-lead µTQFN package, and extended industrial temperature range (–40°C to +125°C). It functions as two independent programmable resistive dividers or rheostats in low-power, battery-operated systems requiring precise analog trimming.

For engineers reviewing the ISL23425WFRUZ-TK datasheet, ISL23425WFRUZ-TK pinout, ISL23425WFRUZ-TK application, or ISL23425WFRUZ-TK equivalent, key selection criteria include its 1.2V–5.5V VLOGIC independence, 70Ω typical wiper resistance at 3.3V, shutdown mode with end-to-end open circuit, ±3mA max wiper current, and daisy-chainable SPI interface for multi-DCP configurations.

Technical Context

The ISL23425WFRUZ-TK integrates two monolithic CMOS DCP cores with make-before-break switching, volatile 8-bit wiper registers (WR0/WR1), and an SPI Mode 0 slave interface operating up to 5MHz (≥1.7V VLOGIC) or 1MHz (1.2V–1.6V VLOGIC). Each DCP supports voltage divider or rheostat modes with guaranteed monotonicity and ratiometric temperature coefficient as low as 8ppm/°C (W option).

Its dual-supply architecture separates analog power (VCC = 1.7V–5.5V) from logic supply (VLOGIC = 1.2V–5.5V), enabling direct interfacing with low-voltage microcontrollers without level shifters. Shutdown mode forces RWi to RLi via internal 2kΩ resistors while maintaining WR register contents.

Key Specifications

Pinout & Package

ISL23425WFRUZ-TK is housed in a 16-lead 2.6mm × 1.8mm µTQFN package (Pb-free, RoHS compliant) with exposed thermal pad. Pinout matches the ISL23425 µTQFN variant per FN7873 Rev 1.00.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP42010-I/P, the ISL23425WFRUZ-TK uniquely supports dual-channel trimming with true 1.2V–5.5V logic independence and µTQFN packaging, making it optimal for space-constrained, ultra-low-voltage embedded systems requiring parallel analog adjustments.

Availability

ISL23425WFRUZ-TK is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, sensor trimming, and battery-powered instrument gain control requiring stable component supply across automotive, industrial, and medical device programs.

Supply support for ISL23425WFRUZ-TK 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 is a global semiconductor leader delivering trusted embedded design innovation, with origins in Intersil's precision analog portfolio acquired in 2017.

The ISL23425WFRUZ-TK belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) product line, engineered for high-accuracy, low-power analog parameter adjustment in battery-operated and thermally demanding applications.

FAQ

What is the total resistance value of the ISL23425WFRUZ-TK?

The ISL23425WFRUZ-TK has a nominal total resistance of 10kΩ between RH and RL terminals for both integrated potentiometers. This value is confirmed in the Ordering Information table (W option) and Analog Specifications section of FN7873 Rev 1.00, with ±20% tolerance over temperature. The 10kΩ value directly determines voltage division ratios and rheostat impedance ranges in circuit implementations.

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

No, the ISL23425WFRUZ-TK uses volatile wiper registers (WR0 and WR1). Upon power-up, both wipers reset to mid-scale (128 decimal / 0x80), as specified in the datasheet's "Principles of Operation" section. To restore custom positions, the host MCU must reprogram WR0/WR1 via SPI after each power-on sequence.

Can the ISL23425WFRUZ-TK operate with a 1.2V logic supply while VCC is at 5V?

Yes, the ISL23425WFRUZ-TK supports independent supplies: VLOGIC can be as low as 1.2V while VCC operates up to 5.5V. This is explicitly stated in the Recommended Operating Conditions and enabled by its internal level translator. The device accepts 1.2V logic signals directly on SCK, SDI, CS, and SDO without external level shifting.

What is the maximum wiper current rating for the ISL23425WFRUZ-TK?

The absolute maximum wiper current for the ISL23425WFRUZ-TK is ±6mA for short durations (≤10 seconds), but the recommended operating limit is ±3mA continuous. Exceeding ±3mA risks increased wiper resistance drift and long-term reliability degradation, as defined in the Recommended Operating Conditions table on page 4 of FN7873 Rev 1.00.

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

In shutdown mode (activated by setting SHDN bit in ACR register), the ISL23425WFRUZ-TK forces each DCP into an end-to-end open circuit while internally connecting RWi to RLi via a 2kΩ resistor. This isolates the potentiometer from the signal path, reduces system leakage, and preserves WR register values for instant restoration upon exit - all detailed in Figure 25 and Section "Shutdown Function" of FN7873 Rev 1.00.