Renesas ISL23511WFB8Z

Overview

ISL23511WFB8Z from Intersil is a single push-button controlled volatile digital potentiometer (XDCP™) with 32 wiper tap points, 10kΩ end-to-end resistance, and low-noise voltage divider operation in an 8-lead SOIC package. It features auto-increment/decrement on sustained button press, shutdown mode with <3µA standby current, and operates from 2.7V to 5.5V for LED brightness control in automotive infotainment displays.

For engineers reviewing the ISL23511WFB8Z datasheet, ISL23511WFB8Z pinout, ISL23511WFB8Z application, or ISL23511WFB8Z equivalent, key selection criteria include push-button interface timing (tS SLOW = 100–375ms), wiper resistance (130–400Ω), ratiometric temperature coefficient (±25ppm/°C), and guaranteed zero-scale wiper position at power-up.

Technical Context

The ISL23511WFB8Z implements a 31-element resistor ladder with a 5-bit up/down counter and decoder driving transfer gates to select one of 32 wiper positions. Its control logic uses internal pull-ups on PU/PD inputs with 15–30ms debounce and dual-mode scanning: slow mode (100–375ms/tap) for single presses and fast mode (25–75ms/tap) after >1s hold.

Shutdown mode activates when both PU and PD are held LOW for ≥2s, disconnecting RH from the resistor chain and forcing wiper to RL (0-tap). Terminal voltage range is rail-to-rail (0V to VCC), supporting direct connection to analog signal paths without level-shifting.

Key Specifications

Pinout & Package

ISL23511WFB8Z is housed in an 8-lead narrow-body SOIC package (M8.15, 4.9mm × 3.9mm × 1.5mm), RoHS-compliant with matte tin e3 termination and MSL3 reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5171BRMZ-10 and MCP4017T-103I/OT, the ISL23511WFB8Z uniquely delivers standalone push-button operation with auto-scan and shutdown-eliminating MCU dependency while offering deterministic power-up state and ultra-low standby current ideal for human-interface analog tuning.

Availability

ISL23511WFB8Z is available at Aetrix Electronics and suitable for automotive display brightness control, industrial HMI contrast adjustment, programmable bias voltage generation, and audio volume control requiring stable component supply across extended temperature ranges.

Supply support for ISL23511WFB8Z 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

Intersil Corporation is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with expertise in high-reliability industrial and automotive signal conditioning solutions.

The ISL23511WFB8Z belongs to Intersil's XDCP™ (eXternally Controlled Digital Potentiometer) family, designed specifically for replacing mechanical potentiometers in harsh-environment analog tuning applications where push-button simplicity, rail-to-rail operation, and guaranteed power-up state are critical.

FAQ

What is the default wiper position of the ISL23511WFB8Z at power-up?

The ISL23511WFB8Z powers up with the wiper at the zero-scale position (tap 0), connecting RW directly to RL. This behavior is guaranteed across all units and operating conditions, ensuring repeatable initial state for applications like display brightness reset. The device does not require initialization commands or external programming to achieve this state - it is inherent to the ISL23511WFB8Z architecture and verified in the FN6588 datasheet Section "Device Operation".

Does the ISL23511WFB8Z support rail-to-rail voltage operation on its RH and RL terminals?

Yes, the ISL23511WFB8Z supports rail-to-rail operation: VRH and VRL may range from 0V to VCC, as specified in the "Potentiometer Specifications" table (Page 3, FN6588 Rev 2.00). This allows direct connection to supply rails without external level-shifting, making the ISL23511WFB8Z suitable for voltage divider configurations in 3.3V or 5V systems where full-scale analog range utilization is required.

How does the shutdown mode function on the ISL23511WFB8Z, and what is its impact on power consumption?

Shutdown mode activates when both PU and PD inputs are held LOW for ≥2 seconds. In this state, the ISL23511WFB8Z disconnects the RH terminal from the resistor chain and forces the wiper to the RL (0-tap) position. Standby current drops to ≤3µA, as confirmed in the "DC Electrical Specifications" table. This feature enables significant power savings in battery-powered or energy-sensitive applications such as automotive infotainment standby modes.

Can the ISL23511WFB8Z be used in rheostat configuration, and how is it implemented?

Yes, the ISL23511WFB8Z supports rheostat operation by floating RH or connecting it to RW. When configured as RW–RL (with RH open), it functions as a two-terminal variable resistor. The datasheet confirms monotonicity and linearity in this mode (RINL ≤ ±1.5 LSB for 10kΩ option), and wiper resistance remains within 130–400Ω - making the ISL23511WFB8Z suitable for current-setting or gain-control applications where three-terminal voltage division is unnecessary.

What is the maximum operating temperature range supported by the ISL23511WFB8Z?

The ISL23511WFB8Z is rated for extended industrial operation from -40°C to +125°C, as stated in the "Recommended Operating Conditions" section (Page 3, FN6588 Rev 2.00). This range is validated for all electrical specifications including RTOTAL tolerance, wiper resistance, and INL/DNL performance - confirming suitability for under-hood automotive, industrial control, and outdoor equipment applications where thermal robustness is mandatory.