Renesas ISL88002IH29Z-T

Overview

ISL88002IH29Z-T from Renesas Electronics is an ultra-low-power, open-drain voltage supervisor IC designed for power-on reset and supply voltage monitoring in battery-powered systems. It features a fixed 2.92V threshold with ±1.2% accuracy, 160nA supply current at 1.8V, 190ms power-on reset timeout, and valid reset assertion down to VDD = 1V. It operates across –40°C to +85°C and is used in microcontroller-based portable equipment to prevent brownout operation.

For engineers reviewing the ISL88002IH29Z-T datasheet, ISL88002IH29Z-T pinout, ISL88002IH29Z-T application, or ISL88002IH29Z-T equivalent, key selection criteria include its open-drain RST output configuration, SOT-23-3 package compatibility, 2.92V trip point tolerance, and guaranteed operation at VDD ≥ 1V - critical for low-voltage embedded system reliability.

Technical Context

The ISL88002IH29Z-T implements a precision bandgap reference and comparator architecture to monitor VDD against a factory-trimmed 2.92V threshold. Its internal hysteresis prevents noise-induced reset chatter, and the POR circuit asserts reset at VDD = 1V to ensure safe initialization before stable supply conditions are reached.

Unlike push-pull variants (ISL88001/ISL88003), this device uses an open-drain RST output requiring an external pull-up resistor (5kΩ–100kΩ), enabling wired-OR reset bus configurations and compatibility with mixed-voltage logic domains. Reset deassertion occurs only after VDD exceeds 2.92V for ≥190ms.

Key Specifications

Pinout & Package

ISL88002IH29Z-T is housed in a Pb-free 3-lead SOT-23 package (JEDEC TO-236), with 0.95mm lead pitch, 1.30mm body length, and 1.00mm height. The package supports automated assembly and meets IPC/JEDEC J-STD-020 MSL requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SUR+T and TPS3808G18DBVR, the ISL88002IH29Z-T delivers superior energy efficiency (160nA vs µA-range), tighter threshold accuracy (±1.2% vs ±2.5%), and native open-drain compatibility - making it optimal for space-constrained, long-life battery applications where precise 2.92V supervision is required.

Availability

ISL88002IH29Z-T is available at Aetrix Electronics and suitable for microcontroller power management, portable medical devices, industrial sensor nodes, and wearables requiring stable component supply with long-term lifecycle support.

Supply support for ISL88002IH29Z-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, infrastructure, and IoT markets.

The ISL88002IH29Z-T belongs to Renesas' Ultra Low Power Voltage Supervisor family, engineered specifically for reliable power-on reset and brownout protection in battery-operated and energy-sensitive embedded systems.

FAQ

What is the exact reset threshold voltage of the ISL88002IH29Z-T?

The ISL88002IH29Z-T has a nominal reset threshold voltage of 2.92V, with guaranteed accuracy of ±1.2% over the –40°C to +85°C temperature range. At +25°C, the typical value is 2.925V, and the full min/max range is 2.850V to 3.000V per datasheet FN6174 Rev 3.00.

Does the ISL88002IH29Z-T require an external pull-up resistor on the RST pin?

Yes, the ISL88002IH29Z-T features an open-drain RST output and requires an external pull-up resistor between the RST pin and the target logic supply (e.g., 3.3V). Renesas recommends values from 5kΩ to 100kΩ; 10kΩ is commonly used to balance speed and current consumption. This is confirmed in the Pin Descriptions section of the ISL88002IH29Z-T datasheet.

What is the minimum supply voltage at which the ISL88002IH29Z-T can assert a valid reset signal?

The ISL88002IH29Z-T asserts a valid reset signal down to VDD = 1.0V, as specified in the datasheet's "Features" and "Electrical Specifications" sections. This ensures reliable brownout detection even during deep discharge of single-cell lithium batteries, where voltage may fall below 2.0V before cutoff.

Is the ISL88002IH29Z-T pin-compatible with other members of the ISL8800x family?

Yes, the ISL88002IH29Z-T shares identical pinout (GND–RST–VDD) and SOT-23-3 package dimensions with all ISL88001/ISL88002/ISL88003 variants in the IH-series (e.g., ISL88002IH46Z-T, ISL88002IH31Z-T). However, output type differs: ISL88002 is open-drain, while ISL88001/ISL88003 are push-pull - requiring schematic review before substitution.

What is the power-on reset timeout duration for the ISL88002IH29Z-T?

The ISL88002IH29Z-T provides a typical power-on reset timeout (tPOR) of 190ms, with a guaranteed range of 140ms to 260ms over temperature. This value is consistent across all ISL88002 variants and is measured from the moment VDD rises above 1V until reset deassertion, ensuring robust initialization timing for microcontrollers and FPGAs.