Renesas ISL95811UFUZ-TK

Overview

ISL95811UFUZ-TK from Renesas (formerly Intersil) is a single-channel, I²C-controlled digital potentiometer with 256-tap resolution, 50 kΩ end-to-end resistance, non-volatile wiper position storage, and integrated 5-byte 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 calibration, and offset trimming in industrial sensor interfaces and programmable power supplies.

For engineers reviewing the ISL95811UFUZ-TK datasheet, ISL95811UFUZ-TK pinout, ISL95811UFUZ-TK application, or ISL95811UFUZ-TK equivalent, key selection criteria include its 50 kΩ total resistance, MSOP-8 package, -40°C to +125°C extended industrial temperature range, I²C write-protection via WP pin, and guaranteed monotonicity across all tap positions.

Technical Context

The ISL95811UFUZ-TK implements a resistor ladder with CMOS switches and supports both three-terminal potentiometer and two-terminal rheostat configurations. Its wiper position is controlled by an 8-bit volatile Wiper Register (WR), initialized at power-up from a non-volatile Initial Value Register (IVR) pre-programmed to 0x80.

It features hardware write protection (WP pin), I²C-compatible timing up to 400 kHz, and dual memory access modes via the Access Control Register (ACR). The device guarantees monotonic operation, ±4 ppm/°C ratiometric temperature coefficient in voltage divider mode, and 1 µs wiper response time after I²C command execution.

Key Specifications

Pinout & Package

ISL95811UFUZ-TK is housed in an 8-lead MSOP package (MDP0043), 3.0 mm × 4.9 mm footprint, 0.65 mm pitch, with exposed pad internally connected to GND. Pin 1 is marked with a dot; pin numbering follows standard MSOP top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL95811UFUZ-TK, ISL95810UFUZ-TK reduces feature count and cost but sacrifices programmable memory; AD5175BRMZ-50 offers SPI flexibility and enhanced thermal specs but demands interface redesign and layout revision.

Availability

ISL95811UFUZ-TK is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply trim, and laser diode bias control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL95811UFUZ-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 acquired Intersil in 2017 and maintains its precision analog portfolio, emphasizing high-reliability, extended-temperature ICs for industrial and automotive markets.

The ISL95811UFUZ-TK belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimpots in calibration-critical, maintenance-free systems.

FAQ

What is the default wiper position stored in the ISL95811UFUZ-TK's non-volatile memory?

The ISL95811UFUZ-TK is factory-programmed with 0x80 (128 decimal) in its Initial Value Register (IVR), placing the wiper at mid-scale (50% of RTOTAL) at power-up. This value is loaded into the volatile Wiper Register (WR) automatically during power-on recall, ensuring repeatable startup behavior without host intervention.

Does the ISL95811UFUZ-TK support both potentiometer and rheostat configurations?

Yes, the ISL95811UFUZ-TK supports both configurations: as a three-terminal potentiometer (RH–RW–RL) for voltage division, and as a two-terminal rheostat (RW–RL or RW–RH) for variable resistance. Its internal switch matrix allows flexible connection - no external components are needed to reconfigure mode.

How does the WP pin protect non-volatile memory in the ISL95811UFUZ-TK?

The WP pin on the ISL95811UFUZ-TK is active-low: when held at logic LOW, it blocks all I²C write operations to non-volatile registers (IVR and GP EEPROM), regardless of command content. This hardware lock prevents unintended overwrites during power transients, ESD events, or firmware bugs - complementing software-based ACR controls.

What is the maximum I²C clock frequency supported by the ISL95811UFUZ-TK?

The ISL95811UFUZ-TK supports standard-mode I²C up to 400 kHz, with guaranteed timing compliance including tLOW ≥ 1.3 µs, tHIGH ≥ 0.6 µs, and tSU:STA ≥ 0.6 µs. This allows direct interfacing with microcontrollers and FPGAs without bit-banging or custom timing delays.

Can the ISL95811UFUZ-TK operate reliably at +125°C ambient temperature?

Yes, the ISL95811UFUZ-TK is rated for -40°C to +125°C extended industrial temperature operation. Its specifications - including DNL, RTOTAL tolerance, and EEPROM retention - are characterized across this full range, and thermal resistance (θ_JA = 160°C/W for MSOP-8) ensures safe junction temperatures under typical PCB layouts.