Renesas ISL22511WFB8Z-TK

Overview

ISL22511WFB8Z-TK from Renesas Electronics is a low-noise, low-power, 32-tap digitally controlled potentiometer (XDCP™) with push-button up/down control, AUTOSTORE, and shutdown mode. It features 10kΩ end-to-end resistance, 3µA max standby current, ±80 ppm/°C end-to-end tempco, and operates from 2.7V to 5.5V. It is used in LED brightness control circuits where precise, non-volatile wiper positioning and minimal power draw are required.

For engineers reviewing the ISL22511WFB8Z-TK datasheet, ISL22511WFB8Z-TK pinout, ISL22511WFB8Z-TK application, or ISL22511WFB8Z-TK equivalent, key selection criteria include verified 10kΩ RTOTAL tolerance (±20%), confirmed 500kHz 3dB cutoff frequency in voltage divider mode, validated 10-lead UTQFN (2.1mm × 1.6mm) package footprint, and documented wiper resistance range (130–500Ω at VCC = 3.3V).

Technical Context

The ISL22511WFB8Z-TK implements a 31-element resistor array with a CMOS wiper switching network controlled by a 5-bit up/down counter. Its push-button interface uses debounced PU/PD inputs with internal 1MΩ pull-ups and 15–28ms debounce time, enabling single-step or auto-increment/decrement operation after 1s hold.

Shutdown mode is activated by holding both PU and PD low for ≥2s, disconnecting RH and moving wiper to RL. AUTOSTORE is enabled when ASE is held low at power-up, retaining last wiper position in EEPROM with 1M-cycle endurance and 50-year data retention at ≤+55°C.

Key Specifications

Pinout & Package

ISL22511WFB8Z-TK is housed in a 10-lead Ultra Thin Quad Flat No-Lead (UTQFN) package measuring 2.1mm × 1.6mm × 0.45mm, RoHS-compliant and moisture-sensitive level MSL3 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ-10 and MCP45HV51-103E/MS, the ISL22511WFB8Z-TK delivers true standalone operation via push-button inputs, guaranteed low-noise performance (-80 dBV), and factory-programmed max-scale power-up position-reducing BOM count and firmware overhead in cost-sensitive consumer and industrial HMI designs.

Availability

ISL22511WFB8Z-TK is available at Aetrix Electronics and suitable for LED/LCD brightness control, volume adjustment, contrast setting, and programmable bias voltage generation requiring stable component supply across extended temperature ranges.

Supply support for ISL22511WFB8Z-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 ISL22511WFB8Z-TK belongs to Renesas' XDCP™ (eXternally Controlled Digital Potentiometer) family, designed specifically for replacing mechanical pots in space-constrained, high-reliability analog trimming applications where push-button simplicity and non-volatile memory are essential.

FAQ

What is the default wiper position of the ISL22511WFB8Z-TK at power-up?

The ISL22511WFB8Z-TK is factory-programmed with the wiper set to the maximum scale position (0x1F hex, tap 31) at power-up. This ensures full resistance between RH and RW on initial startup, which is critical for fail-safe behavior in bias voltage and contrast control circuits. The position remains at 0x1F unless modified by PU/PD inputs or stored via AUTOSTORE or manual ASE pulse.

Does the ISL22511WFB8Z-TK require an external microcontroller to operate?

No, the ISL22511WFB8Z-TK operates autonomously using only two push-button switches connected to PU and PD pins. Its internal 5-bit up/down counter, debounce circuitry, and EEPROM eliminate the need for MCU intervention. This makes the ISL22511WFB8Z-TK ideal for cost-sensitive, low-complexity analog trimming where adding firmware or I²C lines is impractical.

How does shutdown mode affect the electrical connections in the ISL22511WFB8Z-TK?

In shutdown mode-activated by holding both PU and PD low for ≥2 seconds-the ISL22511WFB8Z-TK disconnects the RH terminal from the resistor array and moves the wiper to the RL terminal (tap 0). This isolates the top of the chain and minimizes leakage, reducing VCC current to <1µA. RH becomes electrically floating, while RW and RL are shorted internally, preserving safe default state in power-sensitive systems.

Can the ISL22511WFB8Z-TK be used in rheostat mode, and how is it configured?

Yes, the ISL22511WFB8Z-TK supports rheostat mode by leaving RH unconnected (floating) and using RW and RL as the two terminals, or by floating RL and using RW and RH. In this configuration, resistance between RW and RL varies from near-0Ω (tap 0) to 10kΩ (tap 31), with monotonic RDNL ≤ ±0.5 MI and RINL ≤ ±1.5 MI-enabling precise current-setting applications such as LED bias or op-amp feedback networks.

What is the maximum allowable voltage on the RH, RL, and RW pins relative to VSS?

The RH, RL, and RW pins of the ISL22511WFB8Z-TK must remain within 0V to VCC (i.e., no negative voltage or overvoltage beyond the supply rail). Absolute maximum ratings specify -0.3V to VCC + 0.3V, but recommended operation limits the range strictly to GND–VCC to prevent latch-up or parametric shift. Exceeding VCC on any DCP pin risks permanent damage and invalidates the ±80 ppm/°C tempco guarantee.