Renesas ISL95811UFUZ-T

Overview

ISL95811UFUZ-T from Renesas (formerly Intersil) is a single-channel, I²C-compatible digitally controlled potentiometer (XDCP™) with 50 kΩ end-to-end resistance, 256-tap resolution (0.4% step accuracy), non-volatile wiper position storage, and 5 bytes of general-purpose EEPROM. It operates from 2.7V to 5.5V and delivers ±0.5 LSB DNL in voltage divider mode - used for precision biasing, gain control, and calibration in industrial sensor signal chains.

For engineers reviewing the ISL95811UFUZ-T datasheet, ISL95811UFUZ-T pinout, ISL95811UFUZ-T application, or ISL95811UFUZ-T equivalent, key selection criteria include its 50 kΩ total resistance option, MSOP-8 package compatibility, I²C write-protection via WP pin, and guaranteed 50-year data retention at ≤+55°C.

Technical Context

The ISL95811UFUZ-T implements a monolithic CMOS resistor ladder with CMOS switch matrix, enabling precise wiper positioning via an 8-bit volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR). Its "make-before-break" switching ensures glitch-free transitions during tap changes.

It supports dual operating modes: voltage divider (RH–RW–RL) and rheostat (RW–RL or RW–RH), with ratiometric temperature coefficient of ±4 ppm/°C and resistance TC of ±45 ppm/°C. The integrated 5-byte EEPROM and hardware write protection (WP pin) enable robust field calibration storage without external memory.

Key Specifications

Pinout & Package

ISL95811UFUZ-T is housed in an 8-lead MSOP (Mini Small Outline Package), Pb-free and RoHS-compliant, with 3.0 mm × 4.9 mm footprint and 0.65 mm lead pitch. Thermal pad is not present in MSOP variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL95811UFUZ-T, ISL95810UFUZ-T trades resolution and EEPROM for lower cost, while AD5175BRMZ-50 offers interface flexibility at the expense of ratiometric stability and hardware write protection - making ISL95811UFUZ-T optimal for calibration-critical, field-deployed industrial systems.

Availability

ISL95811UFUZ-T is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply trim, and LED bias control requiring stable component supply across extended temperature ranges (-40°C to +125°C).

Supply support for ISL95811UFUZ-T 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 acquired Intersil in 2017 and continues to support its precision analog portfolio, including digitally controlled potentiometers and sensor interface ICs.

The ISL95811UFUZ-T belongs to the XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimpots in automated calibration, gain control, and bias adjustment applications where long-term stability and non-volatile settings are mandatory.

FAQ

What is the total resistance and tolerance of ISL95811UFUZ-T?

The ISL95811UFUZ-T has a nominal total resistance (RH to RL) of 50 kΩ with a tolerance of ±20%. This value is specified under recommended operating conditions and is confirmed in the Analog Specifications table on page 3 of FN6759 Rev 1.00. The device maintains this resistance across its full temperature range (-40°C to +125°C) with a ratiometric temperature coefficient of ±4 ppm/°C in voltage divider mode.

Does ISL95811UFUZ-T retain wiper position after power cycling?

Yes, ISL95811UFUZ-T retains wiper position after power cycling via its non-volatile Initial Value Register (IVR). At power-up, the device automatically recalls the IVR contents into the volatile Wiper Register (WR), restoring the last-saved tap position. This behavior is guaranteed for 50 years at temperatures ≤+55°C and is explicitly documented in the "Principles of Operation" section (page 10) of the datasheet.

How does the WP pin function on ISL95811UFUZ-T?

The WP (Write Protect) pin on ISL95811UFUZ-T is an active-low hardware lock that disables all I²C write operations - both volatile and non-volatile - when held at logic LOW. When WP is HIGH, normal read/write access is enabled. This feature prevents accidental overwrites of calibration data or EEPROM contents during firmware updates or system resets, and is detailed in the Pin Descriptions (page 2) and Data Protection section (page 12).

Can ISL95811UFUZ-T operate in rheostat mode?

Yes, ISL95811UFUZ-T supports rheostat mode by connecting either RH or RL to GND (or open) and using RW and the remaining terminal as a two-terminal variable resistor. The datasheet confirms monotonic performance in this configuration, with ±0.5 MI DNL and ±1 MI INL for the 50 kΩ (U) variant, as shown in Figures 9–12 and specified in the Resistor Mode section (page 4).

What package type and dimensions does ISL95811UFUZ-T use?

ISL95811UFUZ-T uses an 8-lead MSOP (Mini Small Outline Package) with package drawing MDP0043. Its dimensions are 3.0 mm × 4.9 mm × 1.1 mm (max height), with 0.65 mm lead pitch and gull-wing leads. This package is Pb-free and RoHS-compliant, and thermal characteristics (θJA = 160°C/W) are specified in the Absolute Maximum Ratings table (page 3).