Renesas ISL23511WFB8Z-TK

Overview

ISL23511WFB8Z-TK from Intersil is a volatile, push-button-controlled digital potentiometer (XDCP™) with 32 wiper tap points, 10kΩ end-to-end resistance, SOIC-8 package, and shutdown mode for ultra-low standby current (≤3µA). It functions as a voltage divider or rheostat in analog signal conditioning circuits requiring manual user adjustment without microcontroller intervention.

For engineers reviewing the ISL23511WFB8Z-TK datasheet, ISL23511WFB8Z-TK pinout, ISL23511WFB8Z-TK application, or ISL23511WFB8Z-TK equivalent, key selection criteria include push-button timing behavior (1s auto-increment threshold), wiper position retention on power-up (zero-scale default), low-noise performance (−80dBV), and extended temperature operation (−40°C to +125°C).

Technical Context

The ISL23511WFB8Z-TK implements a 31-element resistor ladder with CMOS transfer gates controlled by a 5-bit up/down counter. Its push-button interface uses internal pull-ups on PU/PD inputs, debounced (15–30ms), enabling single-step or auto-scan operation-slow mode (100–375ms/tap) for precise control and fast mode (25–75ms/tap) after 1s hold.

Shutdown mode activates when PU and PD are held low simultaneously for ≥2s, disconnecting RH from the array and forcing wiper to RL (lowest position), reducing ICC to ≤3µA. The device operates from 2.7V to 5.5V and supports terminal voltages from 0 to VCC, with wiper current limited to ±3.0mA and total power rating of 15mW.

Key Specifications

Pinout & Package

ISL23511WFB8Z-TK is housed in an 8-lead narrow-body SOIC package (M8.15, 4.9mm × 3.9mm × 1.5mm), RoHS-compliant, with standard lead pitch of 1.27mm. Pin 1 is index-marked at top-left corner (top view).

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-TK uniquely combines push-button autonomy, zero-software overhead, sub-3µA shutdown, and guaranteed zero-scale power-up-making it optimal for cost-sensitive, user-adjustable analog front-ends without microcontroller involvement.

Availability

ISL23511WFB8Z-TK is available at Aetrix Electronics and suitable for volume control, LED brightness control, and contrast adjustment requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for ISL23511WFB8Z-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

Intersil Corporation (now part of Renesas Electronics) is a precision analog and power management specialist, delivering high-reliability solutions for industrial, infrastructure, and high-end consumer markets.

The ISL23511WFB8Z-TK belongs to Intersil's XDCP™ (eXternally-Driven Controlled Potentiometer) family, designed specifically for replacing mechanical pots in environments demanding long-term reliability, ESD robustness, and tactile user interface simplicity.

FAQ

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

The ISL23511WFB8Z-TK initializes its wiper to tap 0 (zero-scale position) at power-up, connecting RW directly to RL. This behavior is guaranteed across all units and does not require external initialization or stored memory, making ISL23511WFB8Z-TK ideal for fail-safe analog biasing where a known low-voltage default is required.

Does the ISL23511WFB8Z-TK support both voltage divider and rheostat configurations?

Yes, the ISL23511WFB8Z-TK supports both modes: as a voltage divider (RH–RW–RL), it provides adjustable output voltage between 0 and VCC; as a rheostat, either RH or RL is floated or tied to RW, yielding a two-terminal variable resistance. The datasheet confirms monotonic performance in both configurations, with specified RINL and RDNL for rheostat use.

How does the auto-scan function work on the ISL23511WFB8Z-TK?

When PU or PD is held low for >1 second, the ISL23511WFB8Z-TK transitions from slow-scan mode (100–375ms per tap) to fast-scan mode (25–75ms per tap). This dual-speed behavior enables fine-grained adjustment for short presses and rapid coarse tuning for extended holds-without requiring firmware or external timing components.

What is the maximum allowable voltage on RH and RL pins relative to VSS for the ISL23511WFB8Z-TK?

The RH and RL pins of the ISL23511WFB8Z-TK must remain within 0V to VCC relative to VSS. Absolute maximum ratings specify that voltage at any DCP pin versus GND must not exceed VCC or fall below −0.3V. Exceeding this range risks latch-up or permanent damage, and VCC must always be ≥ VRH and VRL per power sequencing requirements.

Is the ISL23511WFB8Z-TK RoHS-compliant and compatible with Pb-free reflow?

Yes, the ISL23511WFB8Z-TK is RoHS-compliant (Pb-free) with matte tin e3 termination, qualified for both SnPb and Pb-free soldering processes. Its MSL rating meets or exceeds IPC/JEDEC J-STD-020 requirements for peak reflow temperatures, and the package drawing (M8.15) specifies full Pb-free material set compliance per Intersil TB347.