Renesas ISL95810WIU8Z

Overview

ISL95810WIU8Z from Renesas Electronics is a single-channel, 256-tap digitally controlled potentiometer (XDCP™) with I²C interface, 10 kΩ end-to-end resistance, 70 Ω typical wiper resistance at 3.3 V, and non-volatile initial value storage - used for precision analog gain/offset trimming in sensor signal conditioning circuits.

For engineers reviewing the ISL95810WIU8Z datasheet, ISL95810WIU8Z pinout, ISL95810WIU8Z application, or ISL95810WIU8Z equivalent, this page delivers verified electrical specs, MSOP-8 package layout, real-world use cases in industrial sensing and power supply feedback, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The ISL95810WIU8Z implements a monolithic CMOS resistor ladder with CMOS switch matrix, enabling precise 8-bit (0–255) wiper positioning via I²C commands. Its volatile Wiper Register (WR) controls instantaneous resistance division, while the non-volatile Initial Value Register (IVR) ensures consistent power-up state (factory-set to 0x80).

It operates across 2.7 V to 5.5 V, supports 400 kHz I²C clock, features hardware write protection (WP pin), and delivers ±4 ppm/°C ratiometric temperature coefficient in voltage divider mode - critical for stable gain calibration over temperature.

Key Specifications

Pinout & Package

ISL95810WIU8Z is housed in an 8-lead MSOP (Mini Small Outline Plastic) package, 3.0 mm × 3.0 mm × 1.1 mm body, with exposed pad not electrically connected. Pin 1 marked by notch or dot; lead pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-10 and MCP45HV51-103E/MS, ISL95810WIU8Z offers superior ratiometric stability (±4 vs. ±45/±100 ppm/°C) and hardware write protection - making it optimal for unattended, calibration-critical industrial instrumentation where long-term repeatability and fault resilience are mandatory.

Availability

ISL95810WIU8Z is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supply feedback, medical instrument gain trimming, and automotive cabin sensor biasing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ISL95810WIU8Z 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, and IoT markets.

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

FAQ

What is the default wiper position at power-up for ISL95810WIU8Z?

At power-up, ISL95810WIU8Z recalls the value stored in its non-volatile Initial Value Register (IVR) into the volatile Wiper Register (WR). The device is factory-programmed with 0x80 (128 decimal), placing the wiper at mid-scale - i.e., approximately 5 kΩ between RW and RL for the 10 kΩ version. This ensures repeatable startup behavior without host intervention.

Can ISL95810WIU8Z operate as a 2-terminal variable resistor?

Yes, ISL95810WIU8Z can be used in rheostat mode by connecting either RH or RL to RW externally (e.g., short RH to RW for RW–RL variable resistance). In this configuration, it provides monotonic 256-step resistance adjustment from near-0 Ω to 10 kΩ, with ±0.75 MI DNL and ±165 ppm/°C resistance tempco - validated per datasheet Figure 8 and Table on Page 4.

Does ISL95810WIU8Z require external pull-up resistors on SDA and SCL?

Yes, ISL95810WIU8Z requires external pull-up resistors on both SDA and SCL lines. Per datasheet Section "Serial Interface Specifications", maximum recommended pull-up is ~2.5 kΩ for 400 pF bus capacitance, and ~20 kΩ for 40 pF. Values must be selected based on actual bus loading to meet tR/tF timing (20 + 0.1×Cb ns) and ensure reliable ACK detection.

How does the WP pin affect non-volatile writes on ISL95810WIU8Z?

The WP pin must be held HIGH to enable any write operation - including non-volatile writes to the IVR. When WP is LOW, ISL95810WIU8Z ignores incoming data bytes, does not issue ACKs, and remains in standby. This hardware lock prevents corruption of calibrated settings during EMI events or firmware faults, independent of I²C command sequencing.

What is the maximum wiper current rating for ISL95810WIU8Z?

The absolute maximum wiper current for ISL95810WIU8Z is ±3.0 mA, as specified under "Recommended Operating Conditions" on Page 3 of the datasheet. Exceeding this limit risks permanent degradation of switch resistance and linearity. For 10 kΩ operation at 5.5 V, maximum allowable voltage across RW–RL is 30 V - but practical designs constrain voltage to maintain current within spec.