Renesas ISL22511WFRU10Z-TK

Overview

ISL22511WFRU10Z-TK from Renesas Electronics is a solid-state, non-volatile, 32-tap digitally controlled potentiometer (XDCP™) with push-button control, shutdown mode, and UTQFN-10 packaging. It provides precise voltage divider or rheostat functionality with 10kΩ end-to-end resistance, ±80 ppm/°C end-to-end temperature coefficient, and 3µA max standby current. It is used in LED brightness control circuits where low-noise, stable wiper positioning and zero-power retention are required.

For engineers reviewing the ISL22511WFRU10Z-TK datasheet, ISL22511WFRU10Z-TK pinout, ISL22511WFRU10Z-TK application, or ISL22511WFRU10Z-TK equivalent, this page delivers verified technical context, confirmed pin functions, real-world use cases, and validated alternative options for volume production and industrial design-in.

Technical Context

The ISL22511WFRU10Z-TK implements a 31-element resistor array with a 5-bit up/down counter and debounced PU/PD inputs to select one of 32 wiper positions. Its AUTOSTORE and manual store modes write wiper position to EEPROM with 1M-cycle endurance and 50-year data retention at ≤+55°C.

Shutdown mode disconnects RH and forces wiper to RL via dual-input timing (2s low on both PU and PD), reducing power consumption to near-zero. Wiper movement supports slow-scan (100–390ms/tap) and fast-scan (20–78ms/tap) modes triggered by button hold duration, with internal 1MΩ pull-ups on PU/PD and 15ms debounce.

Key Specifications

Pinout & Package

ISL22511WFRU10Z-TK uses a 10-lead Ultra Thin Quad Flat No-Lead (UTQFN) package per drawing L10.2.1x1.6A, with exposed thermal pad and RoHS-compliant NiPdAu-Ag e4 termination. Pin 1 is marked by index area in top-left corner; pins 5 and 10 are NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ10 and MCP45HV51-103E/MC, the ISL22511WFRU10Z-TK delivers superior thermal stability (±80 ppm/°C vs. 500/100 ppm/°C), smallest footprint (2.1×1.6mm vs. 3×4.9/5×4.4mm), and hardware-only control-reducing firmware overhead and PCB complexity in cost-sensitive, space-constrained analog trimming applications.

Availability

ISL22511WFRU10Z-TK is available at Aetrix Electronics and suitable for LED brightness control, volume control, contrast adjustment, and programmable bias voltage generation requiring stable component supply across automotive, industrial, and consumer product lifecycles.

Supply support for ISL22511WFRU10Z-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 microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT applications.

The ISL22511WFRU10Z-TK belongs to Renesas' XDCP™ family of solid-state potentiometers, engineered for replacing mechanical trimmers in harsh environments where reliability, temperature stability, and long-term calibration retention are critical.

FAQ

What is the default wiper position of the ISL22511WFRU10Z-TK at power-up?

The ISL22511WFRU10Z-TK is factory-programmed with the wiper set to the highest position (0x1Fh, or tap 31). This ensures maximum RH-to-RW resistance on initial power application, which is essential for fail-safe behavior in bias voltage and contrast control circuits where open-circuit or high-resistance startup is preferred.

Does the ISL22511WFRU10Z-TK require an external microcontroller to operate?

No, the ISL22511WFRU10Z-TK operates autonomously using only two push-button switches connected to PU and PD. Its internal 5-bit up/down counter, debounce logic, and EEPROM eliminate the need for firmware or serial communication-making it ideal for ultra-low-cost, low-complexity analog trimming applications where MCU resources are constrained.

How does shutdown mode affect the electrical connections in the ISL22511WFRU10Z-TK?

In shutdown mode, the ISL22511WFRU10Z-TK physically disconnects the RH terminal from the resistor chain and moves the wiper to the RL terminal (tap 0). This breaks the RH–RW path while maintaining RW–RL continuity, minimizing current draw and preventing unintended voltage division during system sleep states-critical for battery-operated devices.

Can the ISL22511WFRU10Z-TK be used in rheostat configuration?

Yes, the ISL22511WFRU10Z-TK supports rheostat operation by floating RH or connecting it to RW. In this mode, RW–RL forms a variable resistance from 0Ω to 10kΩ with monotonic RDNL ≤±0.5 MI and RINL ≤±1.5 MI-enabling use in current-setting, gain-control, and oscillator frequency adjustment circuits without additional components.

What is the maximum wiper current rating for the ISL22511WFRU10Z-TK?

The ISL22511WFRU10Z-TK specifies a maximum wiper current of ±3.0mA under recommended operating conditions. Exceeding this limit risks localized heating and long-term drift in wiper resistance; designers must ensure load impedance or series limiting resistors keep RW current within this bound during steady-state and transient operation.