Renesas ISL95810WIRT8Z

Overview

ISL95810WIRT8Z from Renesas Electronics is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with I²C interface, 50kΩ total resistance, 70Ω typical wiper resistance at 3.3V, and non-volatile initial value storage. It operates from 2.7V to 5.5V and is used for precision analog trimming in power supply feedback loops, sensor calibration, and programmable gain control.

For engineers reviewing the ISL95810WIRT8Z datasheet, ISL95810WIRT8Z pinout, ISL95810WIRT8Z application, or ISL95810WIRT8Z equivalent, this page delivers verified electrical specs, TDFN-8 package layout, I²C timing constraints, wiper register behavior, and real-world use cases in industrial and embedded systems requiring stable, low-noise resistance adjustment without mechanical wear.

Technical Context

The ISL95810WIRT8Z implements a monolithic CMOS DCP using resistor ladders and CMOS switches, with wiper position controlled via an 8-bit volatile Wiper Register (WR) and initialized at power-up from a non-volatile Initial Value Register (IVR). Its architecture supports both 3-terminal potentiometer and 2-terminal rheostat configurations.

It features hardware write protection (WP pin), I²C-compatible serial interface (400kHz max), and guaranteed monotonicity in both voltage divider and rheostat modes across –40°C to +85°C. Power-on recall occurs at VCC ≥ 1.8V, with full initialization completed within 3ms after VCC exceeds the POR threshold.

Key Specifications

Pinout & Package

ISL95810WIRT8Z is housed in an 8-lead 3×3 mm TDFN package (RoHS-compliant, exposed pad), optimized for space-constrained PCB layouts and thermal performance (θ_JA = 48°C/W).

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, ISL95810WIRT8Z offers superior wiper resistance (70Ω vs. ≥100Ω), integrated WP pin for secure configuration, and compact 3×3 mm TDFN packaging-making it optimal for space-constrained, low-noise, I²C-based trimming in industrial and medical electronics.

Availability

ISL95810WIRT8Z is available at Aetrix Electronics and suitable for industrial power management, sensor calibration, programmable gain amplification, and audio signal conditioning requiring stable component supply and RoHS-compliant packaging.

Supply support for ISL95810WIRT8Z 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 connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL95810 family was designed specifically for high-reliability, low-noise digital trimming in analog signal chains-targeting applications where mechanical potentiometers fail due to wear, vibration, or environmental stress.

FAQ

What is the default wiper position of the ISL95810WIRT8Z at power-up?

The ISL95810WIRT8Z powers up with its volatile Wiper Register (WR) loaded from the non-volatile Initial Value Register (IVR), which is factory-programmed to 0x80 (128 decimal)-placing the wiper at mid-scale between RH and RL. This ensures consistent startup behavior without host initialization.

Does the ISL95810WIRT8Z support both potentiometer and rheostat configurations?

Yes, the ISL95810WIRT8Z supports both configurations: as a 3-terminal potentiometer (RH–RW–RL) for voltage division, and as a 2-terminal rheostat (RW–RL or RW–RH) for variable resistance. The device's internal switch matrix enables either topology without external components.

How does the WP pin affect write operations on the ISL95810WIRT8Z?

The WP pin on the ISL95810WIRT8Z must be held HIGH to allow any I²C write operation. When WP is LOW, the device ignores incoming Data Bytes, does not issue ACKs, and remains in standby-preventing unintended changes to the Wiper Register or Initial Value Register during system operation.

What is the maximum allowable capacitive load on the SDA/SCL lines for reliable I²C operation with the ISL95810WIRT8Z?

The ISL95810WIRT8Z specifies a maximum total capacitive load (Cb) of 400 pF on SDA or SCL lines. For 400 pF, the recommended off-chip pull-up resistor is ~2–2.5 kΩ; for lower loads (e.g., 40 pF), values up to 15–20 kΩ are acceptable-ensuring rise/fall times stay within 250 ns limits.

Can the ISL95810WIRT8Z retain its wiper setting after power cycling?

Yes-the ISL95810WIRT8Z stores the initial wiper value in non-volatile memory (IVR) with 50-year data retention at ≤+75°C. At each power-up, the IVR content is automatically loaded into the volatile Wiper Register (WR), restoring the last-saved position without host intervention.