Renesas ISL95810UIRT8Z

Overview

ISL95810UIRT8Z from Renesas Electronics is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with I²C interface, 50kΩ end-to-end resistance, ±165 ppm/°C resistance temperature coefficient, and 70Ω typical wiper resistance at 3.3V - used for precision analog trimming in power supply feedback loops, sensor calibration, and programmable gain control.

For engineers reviewing the ISL95810UIRT8Z datasheet, ISL95810UIRT8Z pinout, ISL95810UIRT8Z application, or ISL95810UIRT8Z equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in the FN8090 Rev.3.01 datasheet and Renesas official specifications.

Technical Context

The ISL95810UIRT8Z implements a monolithic CMOS DCP using resistor ladders and CMOS switches, with an 8-bit volatile Wiper Register (WR) and non-volatile Initial Value Register (IVR) storing power-up wiper position. It operates as either a 3-terminal potentiometer (RH–RW–RL) or 2-terminal rheostat (RW–RL or RW–RH).

I²C communication uses standard 400 kHz clock rate, supports write-protection via hardware WP pin, and features automatic power-on recall of IVR to WR. The device supports both volatile writes (fast update) and non-volatile writes (12–20 ms cycle time), with EEPROM endurance rated at 200,000 cycles and 50-year data retention at ≤+75°C.

Key Specifications

Pinout & Package

ISL95810UIRT8Z is housed in an 8-lead 3×3 mm thin dual flat no-lead (TDFN) package with exposed thermal pad. Pin numbering follows JEDEC L8.3x3A outline; pin 1 is marked by index area in top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-50 and MCP45HV51-503E/MS, the ISL95810UIRT8Z uniquely combines I²C compatibility, hardware write protection, non-volatile startup state, and low 70 Ω wiper resistance - making it optimal for industrial power and sensor systems requiring robust, self-contained analog programmability.

Availability

ISL95810UIRT8Z is available at Aetrix Electronics and suitable for industrial power supplies, sensor calibration modules, programmable gain amplifiers, and LED driver designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL95810UIRT8Z 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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT applications.

The ISL95810 series belongs to Renesas' precision analog XDCP™ portfolio, designed specifically for replacing mechanical potentiometers in digitally configurable analog signal chains - emphasizing reliability, low noise, and seamless I²C integration.

FAQ

What is the default wiper position after power-up for the ISL95810UIRT8Z?

The ISL95810UIRT8Z powers up with its volatile Wiper Register (WR) initialized to 0x80 (128 decimal), placing the wiper at mid-scale. This occurs because the factory-programmed Initial Value Register (IVR) contains 0x80, and the device automatically loads IVR into WR during power-on recall. This behavior is guaranteed across all operating conditions per FN8090 Rev.3.01.

Does the ISL95810UIRT8Z support both potentiometer and rheostat configurations?

Yes, the ISL95810UIRT8Z supports both configurations. As a 3-terminal potentiometer, it uses RH, RW, and RL pins for voltage division. As a 2-terminal rheostat, it connects either RW–RL (with RH open) or RW–RH (with RL open). The datasheet confirms monotonicity and INL/RINL specs for both modes, enabling flexible analog design without external components.

How does the WP pin function on the ISL95810UIRT8Z?

The WP (Write Protect) pin on the ISL95810UIRT8Z is active-low: when pulled LOW, it blocks all I²C write operations - including volatile and non-volatile register updates - and forces the device into standby mode. When HIGH, writes are enabled. This hardware lock prevents accidental configuration changes during system operation, independent of firmware state.

What is the maximum allowable capacitive load on the SDA/SCL lines for reliable I²C operation with the ISL95810UIRT8Z?

The ISL95810UIRT8Z specifies a maximum total bus capacitance (Cb) of 400 pF for SDA and SCL lines. At this limit, the recommended external pull-up resistor is ~2–2.5 kΩ for 400 kHz operation. Exceeding 400 pF risks violating t_R/t_F and timing margins (e.g., t_SU:DAT, t_HD:DAT), potentially causing ACK failures or data corruption - verified in Table "SERIAL INTERFACE SPECIFICATIONS" on page 4 of FN8090 Rev.3.01.

Can the ISL95810UIRT8Z be used in a −40°C to +105°C environment?

No - the ISL95810UIRT8Z is rated for −40°C to +85°C only. While the datasheet lists an extended-range variant (ISL95810UART8Z-T) qualified to +105°C, the ISL95810UIRT8Z ordering code explicitly specifies "−40 to +85°C" in the Ordering Information table (page 2). Operating beyond +85°C may cause parametric shift or reduced EEPROM retention, violating guaranteed specifications.