Diodes Incorporated ZM33064CSTOB

Overview

ZM33064CSTOB from Zetex Semiconductors is a three-terminal under-voltage monitor IC for microprocessor power-on reset and brownout detection in 5 V systems, featuring a fixed 4.6 V threshold, 20 mV hysteresis, open-collector output capable of sinking ≥10 mA, and guaranteed operation from 1.0 V to 6.5 V supply.

For engineers reviewing the ZM33064CSTOB datasheet, ZM33064CSTOB pinout, ZM33064CSTOB application, or ZM33064CSTOB equivalent, key selection criteria include threshold accuracy across temperature (±0.1 V), low quiescent current (200 µA max at 5 V), TO-92 package compatibility, clamp diode integration for reset delay capacitor discharge, and open-collector interface simplicity with single pull-up resistor.

Technical Context

The ZM33064CSTOB integrates a precision bandgap voltage reference and comparator with built-in hysteresis to eliminate oscillation near the 4.6 V trip point. Its internal clamp diode enables direct connection to an external RC timing network for programmable reset delay without discrete components.

Operation begins at 1.0 V supply, holding output low until V_CC exceeds the upper threshold (4.61 V typ); output remains high until V_CC drops below the lower threshold (4.59 V typ), then pulls low again-ensuring reliable power-on and brownout reset generation in embedded 5 V logic rails.

Key Specifications

Pinout & Package

Package: TO-92 (suffix C), through-hole mounting, 3-pin plastic case with standard lead spacing and thermal rating of 780 mW.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar under-voltage monitor applications.

Compared with MAX809TRD2T and TLV7031DBVR, the ZM33064CSTOB delivers fixed 4.6 V accuracy with integrated clamp diode and proven 1.0 V startup-reducing component count and simplifying reset timing in cost-sensitive TO-92-based 5 V systems.

Availability

ZM33064CSTOB is available at Aetrix Electronics and suitable for microprocessor systems, automotive body electronics, and battery-powered instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for ZM33064CSTOB 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

Zetex Semiconductors (now part of Diodes Incorporated) specialized in high-performance analog and power management ICs, with emphasis on reliability and ease-of-use in industrial and automotive environments.

The ZM33064 series was designed specifically for robust, low-component-count power-supply monitoring in 5 V microprocessor systems-prioritizing threshold stability, hysteresis integrity, and seamless integration with legacy TO-92 footprints.

FAQ

What is the minimum supply voltage required for ZM33064CSTOB to assert a valid reset?

The ZM33064CSTOB begins functional operation at 1.0 V and holds its open-collector output low until the supply rises above 4.61 V (typ). Below 1.0 V, behavior is undefined per absolute maximum ratings; however, the device remains undamaged down to −1 V input.

Can ZM33064CSTOB drive a microcontroller's active-high reset input directly?

No-it features an open-collector output that sinks current when active. To interface with an active-high reset input, connect a pull-up resistor (e.g., 10 kΩ) from the OUT pin to the target supply rail (e.g., 5 V or 3.3 V), so output low = reset asserted.

How does the internal clamp diode affect reset delay timing?

The internal clamp diode (V_F ≤ 1.2 V at 10 mA) discharges the external RC delay capacitor when V_CC falls below 1.0 V, ensuring consistent reset pulse width on subsequent power cycles without manual discharge circuitry.

Is ZM33064CSTOB qualified for automotive temperature range?

Yes-the device is specified for operation from −40 °C to +85 °C, with threshold drift of ±0.05 V over that range, and is widely deployed in automotive body control modules and infotainment power supervisors.