Renesas ISL90728WIE627Z-TK

Overview

ISL90728WIE627Z-TK from Renesas (formerly Intersil) is a volatile 128-tap digitally controlled potentiometer (XDCP™) with I²C interface, 10kΩ total resistance, ±20% tolerance, and SC-70-6 package. It functions as a precision programmable resistor divider or rheostat in analog signal conditioning paths, supporting voltage ranges from 2.7V to 5.5V and operating across -40°C to +85°C.

For engineers reviewing the ISL90728WIE627Z-TK datasheet, ISL90728WIE627Z-TK pinout, ISL90728WIE627Z-TK application, or ISL90728WIE627Z-TK equivalent, key selection considerations include its I²C address (7Ch), wiper response time (500 ns), ratiometric tempco (±15 ppm/°C), and low standby current (500 nA).

Technical Context

The ISL90728WIE627Z-TK implements a 127-element resistor array with CMOS wiper switches controlled by a 7-bit volatile wiper register. Its I²C slave interface uses open-drain SDA/SCL pins compliant with 400 kHz standard-mode timing, including tLOW ≥1300 ns and tHIGH ≥600 ns.

It operates in two primary modes: voltage divider (RH–RW–RL) with ±0.2 LSB INL and ±0.1 LSB DNL, and rheostat (RW–RL) with ±45 ppm/°C resistance tempco. Power-on defaults the wiper to midscale (64 decimal), and DCP terminal voltage is limited to VCC with ±6 mA absolute max current.

Key Specifications

Pinout & Package

ISL90728WIE627Z-TK is housed in a Pb-free 6-lead SC-70 package (JEDEC MO203AB, Intersil P6.049), measuring 2.15 mm × 1.35 mm × 0.95 mm with 0.65 mm lead pitch. The package supports reflow per JEDEC J-STD-020, with θJA = 480°C/W and θJC = 210°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL90728WIE627Z-TK, AD5170BRJZ-10-R7 offers non-volatility but lacks ratiometric tempco performance, while MCP4017T-103I/OT trades resolution and stability for broader supply compatibility and lower cost-making ISL90728WIE627Z-TK optimal for high-precision, temperature-stable I²C-based trimming.

Availability

ISL90728WIE627Z-TK is available at Aetrix Electronics and suitable for LCD brightness control, RF amplifier biasing, sensor transducer calibration, and op-amp gain/offset trim requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for ISL90728WIE627Z-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

Renesas Electronics Corporation (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog power, and mixed-signal solutions for industrial, automotive, and communications markets.

The ISL90728WIE627Z-TK belongs to Renesas' XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical pots in precision analog tuning applications where programmability, stability, and small footprint are critical.

FAQ

What is the I²C address of the ISL90728WIE627Z-TK?

The ISL90728WIE627Z-TK has a fixed 7-bit I²C slave address of 7Ch (hex), distinct from the ISL90727 (5Ch). This allows both devices to coexist on the same I²C bus without address conflict. The address is hardwired and not user-configurable, ensuring deterministic communication in multi-device systems.

Does the ISL90728WIE627Z-TK retain wiper position after power cycling?

No, the ISL90728WIE627Z-TK is a volatile digitally controlled potentiometer: its 7-bit wiper register resets to 40h (64 decimal, midscale) each time VDD rises above the power-on reset threshold. This behavior is intentional for applications requiring known startup conditions without non-volatile memory overhead or write-cycle delays.

What is the maximum allowable voltage across the DCP terminals of the ISL90728WIE627Z-TK?

The absolute maximum voltage across any DCP terminal (RH, RW, RL) relative to GND is VCC, with a hard limit of -0.3V to +7V on VDD. For safe operation, the voltage differential between RH and RL must not exceed VCC, and continuous power dissipation per DCP element must remain ≤5 mW to avoid thermal drift or damage.

Can the ISL90728WIE627Z-TK be used in rheostat mode only (RW–RL)?

Yes, the ISL90728WIE627Z-TK supports true rheostat operation by connecting RH to VDD (or floating it if unused) and using RW and RL as the two-terminal variable resistor. In this mode, resistance varies from near 0 Ω (wiper at RL) to 10 kΩ (wiper at RH), with ±45 ppm/°C tempco and monotonic 128-step adjustment.

What is the wiper resistance specification for the ISL90728WIE627Z-TK at 5V supply?

The ISL90728WIE627Z-TK specifies wiper resistance (RW) of 85–200 Ω at VCC = 3.3V and +25°C. While not explicitly tested at 5V, the datasheet confirms RW remains within this range across the full 2.7V–5.5V supply range due to CMOS switch design-no significant voltage-dependent increase is observed up to 5.5V.