Renesas ISL22346UFRT20Z-TK

Overview

ISL22346UFRT20Z-TK from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) with I²C interface, 128-tap resolution, 50 kΩ end-to-end resistance, and non-volatile wiper position storage. It operates from 2.7V to 5.5V, supports -40°C to +125°C, and integrates shutdown mode with ≤5 µA standby current. Used for precision analog trimming in sensor signal conditioning and power supply feedback loops.

For engineers reviewing the ISL22346UFRT20Z-TK datasheet, ISL22346UFRT20Z-TK pinout, ISL22346UFRT20Z-TK application, or ISL22346UFRT20Z-TK equivalent, this device delivers deterministic wiper positioning across four independent DCPs, low 70 Ω typical wiper resistance at 3.3 V, and guaranteed monotonicity in both voltage divider and rheostat modes - critical for closed-loop calibration and gain control.

Technical Context

The ISL22346UFRT20Z-TK implements four independent resistor arrays using CMOS-switched ladder networks, each with 128 discrete tap positions. Wiper position is controlled via volatile Wiper Registers (WR0–WR3), while Initial Value Registers (IVR0–IVR3) retain settings in non-volatile EEPROM for power-up recall.

It uses an I²C-compatible serial interface with three address pins (A0–A2), supporting up to eight devices on one bus. Shutdown is asserted either by logic-low SHDN pin or ACR register bit, placing all DCPs into open-circuit RH–RL state and shorting RW to RL - preserving register contents and enabling ultra-low-power system states.

Key Specifications

Pinout & Package

ISL22346UFRT20Z-TK is housed in a 20-lead 4 mm × 4 mm TQFN package (RoHS-compliant, exposed pad internally connected to GND). Pin numbering follows top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5242BRUZ100 and MCP45HV51-503E/ST, the ISL22346UFRT20Z-TK uniquely combines guaranteed monotonicity, 128-tap precision, and EEPROM-based power-on recall in a compact TQFN - making it optimal for unattended recalibration and fail-safe analog tuning where host initialization cannot be assumed.

Availability

ISL22346UFRT20Z-TK is available at Aetrix Electronics and suitable for industrial motor control, automotive HVAC systems, and programmable power supply design requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL22346UFRT20Z-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 acquired Intersil in 2017 and maintains full technical and manufacturing continuity for legacy Intersil precision analog products including the ISL22346 family.

The ISL22346 series was designed specifically for high-reliability analog trimming in harsh environments - emphasizing non-volatile memory endurance, wide temperature operation, and deterministic monotonic response for closed-loop calibration systems.

FAQ

What is the package type and lead count of the ISL22346UFRT20Z-TK?

The ISL22346UFRT20Z-TK uses a 20-lead 4 mm × 4 mm TQFN package with exposed thermal pad. This RoHS-compliant package supports high-density PCB layouts and provides superior thermal performance compared to TSSOP variants. The ISL22346UFRT20Z-TK pinout is fully documented in the FN6177 datasheet, including exact mapping for RH, RL, RW, SCL, SDA, address, and SHDN terminals.

Does the ISL22346UFRT20Z-TK support true power-on wiper recall?

Yes. The ISL22346UFRT20Z-TK automatically loads wiper positions from its non-volatile Initial Value Registers (IVRs) into volatile Wiper Registers (WRs) upon power-up, provided VCC exceeds 2.0 V. This recall occurs within 3 ms and ensures repeatable analog behavior without host MCU involvement. The ISL22346UFRT20Z-TK retains IVR data for 50 years at temperatures below +55°C.

Can the ISL22346UFRT20Z-TK operate from a 3.3 V supply?

Yes. The ISL22346UFRT20Z-TK is fully specified for operation from 2.7 V to 5.5 V, including nominal 3.3 V systems. At 3.3 V, key parameters include 70 Ω typical wiper resistance, ≤5 µA shutdown current, and guaranteed I²C communication at 400 kHz. All electrical specifications in the FN6177 datasheet include 3.3 V test conditions, confirming robust performance in modern low-voltage designs.

How many devices can share the same I²C bus with the ISL22346UFRT20Z-TK?

Up to eight ISL22346UFRT20Z-TK devices can coexist on a single I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit slave addresses. Each device responds only to its assigned 7-bit address (1010xxxR/W format), eliminating address conflicts. The ISL22346UFRT20Z-TK supports standard-mode I²C (up to 400 kHz) and requires external pull-up resistors on SCL and SDA lines.

Is the ISL22346UFRT20Z-TK suitable for automotive applications?

Yes. The ISL22346UFRT20Z-TK is qualified for the extended industrial temperature range of -40°C to +125°C and meets AEC-Q200 stress test requirements for passive components. Its non-volatile memory endurance (1 million cycles), low drift (±80 ppm/°C end-to-end TCR), and shutdown capability make it suitable for under-dash HVAC control, body electronics calibration, and engine management subsystems where reliability and recalibration stability are critical.