Renesas ISL90460WIH527-TK

Overview

ISL90460WIH527-TK from Intersil is a volatile, single-channel, 32-tap digitally controlled potentiometer (XDCP) configured as a rheostat with RH-to-GND variable resistance, 10kΩ end-to-end resistance, -40°C to +85°C operating range, and 2-pin Up/Down interface - used for LCD contrast control and sensor bias adjustment.

For engineers reviewing the ISL90460WIH527-TK datasheet, ISL90460WIH527-TK pinout, ISL90460WIH527-TK application, or ISL90460WIH527-TK equivalent, key selection criteria include wiper settling time (1µs), supply current (0.3µA standby), volatile memory behavior, SOT-23-5 package compatibility, and 35ppm/°C tempco for precision analog tuning.

Technical Context

The ISL90460WIH527-TK implements a 31-element resistor array with electronic wiper switching controlled by CS and U/D signals; wiper position is stored in volatile memory only upon CS high transition. It operates exclusively as a two-terminal rheostat (RH–GND), not a three-terminal potentiometer.

Its 2-pin serial interface requires CS low to enable counting, with U/D edge-triggered increment/decrement; no clock signal is needed. The device draws ≤25µA active current at 3V and exhibits ±1 MI absolute linearity over taps 1–29, where MI = RTOT/31 ≈ 323Ω for the 10kΩ version.

Key Specifications

Pinout & Package

ISL90460WIH527-TK is housed in a Pb-free 5-lead SOT-23 package (JEDEC MO-178AA, pkg drawing P5.064), measuring 2.80mm × 1.90mm × 1.10mm, with gull-wing leads and 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL90461WIH527Z-TK and ISL23511IRUZ-TK, the ISL90460WIH527-TK delivers lowest system complexity and standby power for basic rheostat functions, trading non-volatility and resolution for simplicity, cost efficiency, and proven reliability in high-volume consumer and industrial trimming.

Availability

ISL90460WIH527-TK is available at Aetrix Electronics and suitable for LCD contrast control, sensor transducer calibration, and industrial parameter trim requiring stable component supply, RoHS compliance, and SOT-23 footprint compatibility.

Supply support for ISL90460WIH527-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

Intersil Corporation is a precision analog and power management IC specialist, now part of Renesas Electronics, with deep expertise in configurable analog interfaces and robust industrial-grade components.

The ISL90460WIH527-TK belongs to Intersil's XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimpots in automated calibration, sensor conditioning, and display tuning applications.

FAQ

What is the resistance tolerance and temperature coefficient of the ISL90460WIH527-TK?

The ISL90460WIH527-TK has an end-to-end resistance (RTOTAL) of 10kΩ with ±20% initial tolerance (8kΩ–12kΩ) and a typical temperature coefficient of ±35ppm/°C over -40°C to +85°C. This ensures predictable drift in sensor bias and display contrast circuits under thermal stress, and the value is confirmed in the Potentiometer Specifications table on page 3 of FN8225 Rev 4.00.

Does the ISL90460WIH527-TK retain its wiper position after power cycling?

No, the ISL90460WIH527-TK uses volatile memory only - wiper position resets on power-up and must be reinitialized by the host controller. This behavior is inherent to its architecture and explicitly stated in the datasheet's "Principles of Operation" section. For non-volatile retention, consider ISL90461WIH527Z-TK instead.

Can the ISL90460WIH527-TK be used as a three-terminal potentiometer?

No, the ISL90460WIH527-TK is internally configured exclusively as a two-terminal rheostat (RH–GND); the low terminal is permanently tied to GND and not accessible externally. Its pinout and block diagram confirm only RH serves as the adjustable node - unlike traditional potentiometers, it lacks independent RL or RW terminals.

What is the maximum toggle rate for the U/D pin on the ISL90460WIH527-TK?

The ISL90460WIH527-TK supports a maximum U/D toggle rate of 1MHz, as specified in the Timing Specifications table (page 4 of FN8225 Rev 4.00). This allows rapid wiper positioning - e.g., full 32-step sweep in ≤32µs - but actual settling requires 1µs per step to ensure RH output stability before sampling.

Is the ISL90460WIH527-TK pin-compatible with other XDCP devices in the same package?

The ISL90460WIH527-TK shares the same 5-lead SOT-23 pinout (VDD, GND, U/D, CS, RH) with ISL90461 and ISL90462 variants, enabling drop-in replacement in many layouts. However, functional differences - especially volatile vs. non-volatile memory - require firmware validation; the datasheet confirms identical pin mapping across this family in the "Pin Descriptions" section.