Renesas ISL95810WIU8Z-T

Overview

ISL95810WIU8Z-T from Renesas Electronics is a single-channel, digitally controlled potentiometer (XDCP™) with 256-tap resolution, I²C interface, 2.5kΩ end-to-end resistance, 70Ω typical wiper resistance at 3.3V, and operation from 2.7V to 5.5V. It functions as a programmable voltage divider or rheostat in precision analog trimming applications such as DC-DC converter feedback networks and sensor calibration circuits.

For engineers reviewing the ISL95810WIU8Z-T datasheet, ISL95810WIU8Z-T pinout, ISL95810WIU8Z-T application, or ISL95810WIU8Z-T equivalent, this page delivers verified specifications, package mapping, I²C timing constraints, non-volatile wiper recall behavior, and real-world use context for embedded analog control design.

Technical Context

The ISL95810WIU8Z-T 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 I²C slave interface operates up to 400kHz, supports hardware write protection (WP), and features dual-register access mode controlled by address 0x02.

It delivers ratiometric temperature coefficient of ±4ppm/°C in voltage divider mode and ±165ppm/°C in rheostat mode, with monotonicity guaranteed across all 256 taps. Standby current is 5µA max at 5.5V, and wiper response time is 1µs after SCL falling edge - enabling fast dynamic adjustment in closed-loop systems.

Key Specifications

Pinout & Package

ISL95810WIU8Z-T uses an 8-lead MSOP package (3.0mm × 3.0mm × 1.1mm height), RoHS-compliant with matte tin terminations. Thermal resistance θ_JA = 151°C/W, θ_JC = 50°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ-2.5 and MCP45HV51-2.5, the ISL95810WIU8Z-T offers integrated hardware write protection, lower wiper resistance, and optimized thermal performance in the compact 8-lead MSOP - making it preferred for industrial feedback loops where reliability and layout efficiency are prioritized.

Availability

ISL95810WIU8Z-T is available at Aetrix Electronics and suitable for DC-DC converter tuning, sensor calibration, programmable bias networks, and audio level control requiring stable component supply and long-term obsolescence management.

Supply support for ISL95810WIU8Z-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 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 precision analog trimming in resource-constrained embedded systems - emphasizing low power, I²C simplicity, non-volatile state retention, and robust industrial temperature operation.

FAQ

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

The ISL95810WIU8Z-T 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). This places the wiper at mid-scale - approximately 1.25kΩ from RL and RH - ensuring predictable startup behavior without host intervention.

Does the ISL95810WIU8Z-T support both voltage divider and rheostat configurations?

Yes, the ISL95810WIU8Z-T supports both modes: as a 3-terminal voltage divider (RH–RW–RL) for adjustable reference scaling, and as a 2-terminal rheostat (RW–RL or RW–RH) for variable resistance in bias or gain networks. The device's monotonicity and low wiper resistance ensure accuracy in either configuration across its full temperature range.

How does the WP pin affect I²C write operations on the ISL95810WIU8Z-T?

The WP pin on the ISL95810WIU8Z-T must be held HIGH to enable any I²C write operation. When WP is LOW, the device ignores incoming data bytes, omits ACK responses, and remains in standby - providing hardware-level protection against unintended wiper changes during system operation or firmware glitches.

What is the maximum allowable voltage across the RH–RL terminals of the ISL95810WIU8Z-T?

The absolute maximum voltage across RH–RL is limited to V_CC, per datasheet Absolute Maximum Ratings. With V_CC rated from 2.7V to 5.5V, the maximum end-to-end DCP voltage is 5.5V. Exceeding this risks permanent damage; for higher-voltage applications, consider the MCP45HV51-2.5 instead.

Can the ISL95810WIU8Z-T be used in systems with 1.8V I²C buses?

No - the ISL95810WIU8Z-T requires V_CC ≥ 2.7V, and its I²C input thresholds (V_IL ≤ 0.3×V_CC, V_IH ≥ 0.7×V_CC) are incompatible with 1.8V logic levels. For 1.8V systems, a level-shifter is required on SDA/SCL lines, or select a 1.8V-compatible DCP like the MAX5487.