Renesas ISL88031IU8EAZ

Overview

ISL88031IU8EAZ from Renesas Electronics is a quintuple voltage-monitoring supervisor IC designed for multi-rail power supply supervision in industrial and computing systems. It monitors five voltages-including two factory-preset thresholds (VDD = 2.866 V, V2MON = 1.683 V) and three adjustable inputs (V3MON/V4MON/V5MON referenced to 0.600 V)-with ±1.8% threshold accuracy, 120 ms nominal reset pulse width, and operation down to VDD = 1 V. It supports manual reset via active-low MR input and delivers open-drain RST output for microprocessor reset signaling.

For engineers reviewing the ISL88031IU8EAZ datasheet, ISL88031IU8EAZ pinout, ISL88031IU8EAZ application, or ISL88031IU8EAZ equivalent, key selection criteria include its dual fixed/adjustable monitoring architecture, low 19 µA supply current at 5 V, immunity to power-supply transients, and compatibility with multi-voltage systems requiring brownout protection and POR sequencing.

Technical Context

The ISL88031IU8EAZ integrates a precision bandgap reference (0.600 V ±2.2%) with five independent voltage comparators: one for VDD (fixed at 2.866 V), one for V2MON (fixed at 1.683 V), and three for externally resistor-divided inputs (V3MON/V4MON/V5MON), all referenced to the same internal VREF. Hysteresis (29 mV on VTH1, 17 mV on VTH2) prevents chatter during voltage recovery.

Its Power-On Reset circuit asserts RST low until VDD exceeds 2.866 V and remains stable for 120 ms (tPOR typ). The MR input includes internal 10 kΩ pull-up and 550 ns minimum pulse width detection, enabling push-button or logic-driven reset initiation without external components.

Key Specifications

Pinout & Package

ISL88031IU8EAZ is housed in an 8-lead MSOP package (JEDEC MO-187-AA compliant, M8.118 drawing), measuring 3.0 mm × 3.0 mm × 0.85 mm, with exposed pad not electrically connected. Pin pitch is 0.65 mm, and lead width is 0.25–0.36 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage monitoring applications.

Compared with MAX6326–UR29 and TPS3808G33, the ISL88031IU8EAZ uniquely delivers five-rail supervision in one 8-pin MSOP, combining two factory-set thresholds with three resistor-programmable inputs-enabling full system-level power integrity coverage without stacking multiple ICs or sacrificing board space.

Availability

ISL88031IU8EAZ is available at Aetrix Electronics and suitable for telecom infrastructure, server motherboard design, and industrial PLC development requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL88031IU8EAZ 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 high-performance, energy-efficient microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT markets.

The ISL88031 belongs to Renesas' precision voltage supervisor product line, engineered specifically for multi-rail power integrity in space-constrained, mission-critical embedded systems where reliability, low power, and integration are non-negotiable.

FAQ

What is the exact voltage threshold configuration for ISL88031IU8EAZ?

The ISL88031IU8EAZ has two factory-programmed fixed thresholds: VDD (VTH1) = 2.866 V and V2MON (VTH2) = 1.683 V, both accurate to ±1.8% over –40°C to +85°C. Its V3MON, V4MON, and V5MON inputs reference an internal 0.600 V comparator threshold, allowing user-defined trip points ≥0.6 V via external resistor dividers. This configuration is confirmed in the FN8227 Rev 2.01 datasheet Table on Page 2 and Electrical Specifications on Page 4.

Does ISL88031IU8EAZ support manual reset, and how is it implemented?

Yes, ISL88031IU8EAZ supports manual reset via Pin 1 (MR), an active-low, debounced input with an internal 10 kΩ pull-up resistor. A logic-low pulse ≥550 ns on MR forces RST low for the full tPOR period (120 ms nominal), then releases RST once complete. No external pull-up is needed, and the input accepts direct connection to a push-button or GPIO. This behavior is fully documented in the Pin Descriptions (Page 2) and Principles of Operation (Page 6) of the FN8227 datasheet.

What is the operating voltage range and quiescent current of ISL88031IU8EAZ?

The ISL88031IU8EAZ operates from VDD = 2.0 V to 5.5 V and draws a maximum supply current (IDD1) of 19 µA at 5.0 V and +25°C. At lower VDD (e.g., 2.5 V), current scales approximately linearly. This ultra-low quiescent current enables use in always-on monitoring circuits without impacting system power budgets. All values are specified in the Electrical Specifications table on Page 4 of FN8227 Rev 2.01.

Can ISL88031IU8EAZ monitor voltages below 1.0 V, and what are the limitations?

No - ISL88031IU8EAZ cannot directly monitor voltages below 0.600 V, as its adjustable inputs (V3MON/V4MON/V5MON) compare against a fixed 0.600 V internal reference. To supervise sub-0.6 V rails (e.g., 0.5 V CPU cores), an external level-shifting circuit is required. The datasheet explicitly states "adjustable voltage inputs monitor voltages > 0.6V" on Page 1 and confirms VREF = 0.600 V ±2.2% on Page 4, establishing this hard lower bound.

What package type and RoHS status does ISL88031IU8EAZ use?

ISL88031IU8EAZ is supplied in an 8-lead MSOP package (M8.118 outline), Pb-free and RoHS compliant per JEDEC standards. The "EZ" suffix in the part number denotes RoHS compliance, and the datasheet confirms "Pb-Free (RoHS Compliant)" under Features (Page 1) and details reflow profile compliance in Thermal Information (Page 4). The package dimensions and land pattern are defined in the M8.118 drawing referenced on Page 9.