Renesas ISL23425TFVZ-TK

Overview

ISL23425TFVZ-TK from Renesas Electronics (formerly Intersil) is a dual, volatile, 256-tap digitally controlled potentiometer (DCP) with SPI interface, 100kΩ end-to-end resistance, 16-lead µTQFN package, and extended industrial temperature range (–40°C to +125°C). It functions as two independent programmable resistive dividers for precision analog trimming in battery-powered instrumentation and power supply margining.

For engineers reviewing the ISL23425TFVZ-TK datasheet, ISL23425TFVZ-TK pinout, ISL23425TFVZ-TK application, or ISL23425TFVZ-TK equivalent, key selection criteria include its dual-channel 256-tap resolution, independent VLOGIC (1.2V–5.5V) enabling direct low-voltage bus interfacing, shutdown mode with open-circuit DCP terminals, and wiper settling time of 300 ns in large-signal transitions.

Technical Context

The ISL23425TFVZ-TK integrates two monolithic CMOS DCP cores with make-before-break wiper switching, each controlled by an 8-bit volatile Wiper Register (WR0/WR1). Its SPI interface operates in Mode 0 (CPOL = 0, CPHA = 0), supporting daisy-chaining and up to 5 MHz clock frequency at VLOGIC ≥ 1.7V.

It features independent analog (VCC = 1.7V–5.5V) and logic (VLOGIC = 1.2V–5.5V) supplies, enabling direct connection to sub-1.8V microcontrollers without level shifters. Shutdown mode disconnects resistor arrays and internally connects each RW to RL via a 2 kΩ path, reducing system leakage and power consumption.

Key Specifications

Pinout & Package

ISL23425TFVZ-TK is housed in a 16-lead, 2.6 mm × 1.8 mm, 0.5 mm pitch µTQFN package (RoHS-compliant, Pb-free, MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP42050-I/ST, the ISL23425TFVZ-TK uniquely combines dual 256-tap channels, independent VLOGIC support down to 1.2V, guaranteed shutdown isolation, and tighter ±2% RH-RL resistance tolerance-making it optimal for high-precision, low-power, mixed-voltage embedded trimming.

Availability

ISL23425TFVZ-TK is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, sensor trimming, and battery-powered instrument gain adjustment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL23425TFVZ-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.

The ISL23425TFVZ-TK belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, engineered specifically for high-accuracy, low-power, and mixed-voltage analog parameter tuning in industrial, automotive, and portable electronics.

FAQ

What is the default wiper position of the ISL23425TFVZ-TK after power-up?

Upon power-up, both wiper registers (WR0 and WR1) of the ISL23425TFVZ-TK reset to 0x80 (128 decimal), positioning each wiper at the exact mid-scale tap (50% resistance ratio). This behavior is guaranteed across the full operating temperature range (–40°C to +125°C) and ensures a known, safe starting state for voltage divider or rheostat configurations before host initialization.

Does the ISL23425TFVZ-TK support daisy-chaining multiple devices on a single SPI bus?

Yes, the ISL23425TFVZ-TK supports daisy-chaining via its SPI interface: the SDO output of one device connects to the SDI input of the next, with shared SCK, CS, and VLOGIC lines. Each device responds only when its CS is asserted, enabling compact multi-channel trimming with minimal GPIO usage-ideal for systems requiring coordinated adjustment of multiple analog parameters.

What is the maximum allowable voltage on the DCP terminals (RH, RL, RW) of the ISL23425TFVZ-TK?

The absolute maximum voltage on any DCP terminal (RH0, RH1, RL0, RL1, RW0, RW1) of the ISL23425TFVZ-TK is limited to the VCC supply voltage-not to 6.0V as stated in Absolute Maximum Ratings. Per the datasheet's "Principles of Operation", voltage at any DCP pin must not exceed VCC during power-up or normal operation to prevent latch-up or reliability degradation.

How does the shutdown mode affect the wiper connections in the ISL23425TFVZ-TK?

In shutdown mode (SHDN bit = 0 in ACR), the ISL23425TFVZ-TK forces each DCP into an end-to-end open circuit (RH–RL disconnected) and internally connects each RW terminal to its corresponding RL terminal through a 2 kΩ series resistor. This isolates the potentiometer from the signal path while preserving the last programmed wiper register values for immediate recall upon exit.

Can the ISL23425TFVZ-TK be used in rheostat (two-terminal) mode, and what are the key specifications in that configuration?

Yes, the ISL23425TFVZ-TK supports rheostat mode by connecting either RH or RL to the wiper (RW) and using the remaining two terminals. In this mode, it delivers 100kΩ total resistance with ±0.3 LSB differential non-linearity (DNL) and 2.1 MI offset error at 1.7V VCC. The wiper resistance remains 70 Ω typical, and the -3dB cutoff frequency is 120 kHz at mid-tap-suitable for DC and low-frequency bias control.