Renesas ISL88003IH31Z-TK

Overview

ISL88003IH31Z-TK from Renesas Electronics is an ultra-low-power 3-pin voltage supervisor IC with push-pull active-high reset output, 3.07V fixed threshold, ±1.2% accuracy, and 190ms power-on reset timeout-designed for reliable power-up sequencing in microcontroller-based portable equipment.

For engineers reviewing the ISL88003IH31Z-TK datasheet, ISL88003IH31Z-TK pinout, ISL88003IH31Z-TK application, or ISL88003IH31Z-TK equivalent, key selection criteria include supply current (160nA), minimum operating VDD (1V), hysteresis-enabled noise immunity, and SOT-23-3 package compatibility with space-constrained embedded designs.

Technical Context

The ISL88003IH31Z-TK implements a precision bandgap reference and comparator-based monitoring circuit that asserts RST high when VDD falls below 3.07V (±1.2%) and holds reset for ≥190ms after VDD rises above threshold. Its internal POR circuit activates at VDD = 1V to ensure valid reset assertion during brown-in conditions.

Unlike open-drain variants (e.g., ISL88002), the ISL88003IH31Z-TK uses a push-pull output stage delivering VOH = VDD − 0.4V (sourcing 0.5mA) and VOL = 0.4V (sinking 0.5mA), eliminating external pull-up components and simplifying interface with 3.3V/5V logic inputs.

Key Specifications

Pinout & Package

ISL88003IH31Z-TK is housed in a Pb-free 3-lead SOT-23 package (JEDEC TO-236, pkg drawing P3.064), measuring 2.92mm × 1.30mm × 1.00mm with 0.95mm lead pitch. The compact footprint suits high-density PCB layouts in handheld and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2-T and TPS3808G30DBVR, the ISL88003IH31Z-TK delivers superior threshold accuracy (±1.2% vs ±2.5%), lower quiescent current (160nA vs 4.5µA), and direct SOT-23-3 drop-in fit-making it optimal for cost-sensitive, battery-limited designs requiring robust 3.07V supervision.

Availability

ISL88003IH31Z-TK is available at Aetrix Electronics and suitable for microcontroller power-up sequencing, portable medical sensors, and industrial I/O modules requiring stable component supply across extended production lifecycles.

Supply support for ISL88003IH31Z-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 is a global semiconductor leader delivering high-performance, low-power MCUs, analog, and power management solutions for automotive, industrial, and IoT markets.

The ISL88003IH31Z-TK belongs to Renesas' Ultra Low Power Voltage Supervisor family, engineered specifically for energy-constrained embedded systems needing precise, single-rail monitoring with minimal board area and zero external components.

FAQ

What is the exact reset threshold voltage of the ISL88003IH31Z-TK?

The ISL88003IH31Z-TK has a nominal reset threshold of 3.07V, with guaranteed accuracy of ±1.2% over −40°C to +85°C. At +25°C, the typical trip point is 3.075V, ranging from 3.038V (min) to 3.112V (max). This value is factory-trimmed and does not require external calibration.

Does the ISL88003IH31Z-TK require an external pull-up resistor on the RST pin?

No, the ISL88003IH31Z-TK features a push-pull active-high RST output and does not require an external pull-up resistor. It sources up to 0.5mA when asserted HIGH (VDD − 0.4V) and sinks up to 0.5mA when released LOW (≤0.4V), enabling direct connection to standard CMOS reset inputs.

Can the ISL88003IH31Z-TK operate with a supply voltage below 1.8V?

Yes-the ISL88003IH31Z-TK asserts reset down to VDD = 1V and remains functional during brown-in events. However, its specified operating VDD range is 1.8V to 5.5V; operation below 1.8V is limited to POR assertion only and not guaranteed for sustained supervision.

What is the power-on reset timeout duration for the ISL88003IH31Z-TK?

The ISL88003IH31Z-TK provides a nominal power-on reset timeout of 190ms, with a guaranteed range of 140ms to 260ms over temperature. This delay ensures sufficient time for microcontroller oscillator stabilization and register initialization before releasing the reset signal.

Is the ISL88003IH31Z-TK pin-compatible with other members of the ISL8800x family?

Yes-the ISL88003IH31Z-TK shares identical 3-pin SOT-23 pinout (GND, RST, VDD) with all ISL88001/88002/88003 variants in the same package. Pin compatibility extends to MAX803/MAX809/MAX810 families, enabling drop-in replacement in existing designs using push-pull RST configurations.