Diodes Incorporated ZM33064GTA

Overview

ZM33064GTA from Zetex Semiconductors is a three-terminal under-voltage monitor IC for microprocessor power-on reset and brown-out detection in 5 V systems, featuring a precise 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 ZM33064GTA datasheet, ZM33064GTA pinout, ZM33064GTA application, or ZM33064GTA equivalent, this device delivers deterministic reset timing, low quiescent current (200 µA typical), internal clamp diode for delay capacitor discharge, and compatibility with TO92/SO8/SOT223 footprints across industrial, automotive, and battery-powered designs.

Technical Context

The ZM33064GTA integrates a precision bandgap voltage reference and comparator with built-in hysteresis to eliminate oscillation near the 4.6 V trip point. Its open-collector output stage uses an NPN transistor with internal clamping, enabling direct interface to TTL/CMOS logic via a single pull-up resistor.

Operation begins at V_CC = 1.0 V, holding output low until V_CC exceeds the rising threshold (4.59 V min); upon subsequent drop below the falling threshold (4.5 V min), it reasserts reset. Propagation delay is 1.5 µs under standard load (R_L = 10 kΩ).

Key Specifications

Pinout & Package

SOT223 package (suffix G), surface-mount, thermally enhanced with exposed thermal pad; pin 4 is floating or internally connected to pin 2 (V_OUT common). Three active terminals: V_IN, GND, and open-collector V_OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809STR and TLV803DBZT, the ZM33064GTA offers superior drive strength (10 mA), integrated clamp functionality, and faster response (1.5 µs), making it optimal for robust reset generation in noise-prone industrial and automotive environments where external component count reduction matters.

Availability

ZM33064GTA is available at Aetrix Electronics and suitable for microprocessor reset, automotive ECU supervision, and battery-powered instrumentation requiring stable component supply and long-lifecycle support.

Supply support for ZM33064GTA 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, precision, and thermal efficiency for industrial and automotive markets.

The ZM33064 belongs to Zetex's voltage supervisor product line, engineered specifically for deterministic power-on reset and brown-out protection in 5 V microprocessor systems operating across extended temperature ranges.

FAQ

What is the function of the internal clamp diode in the ZM33064GTA?

The internal clamp diode discharges external RC timing capacitors automatically during reset deassertion, eliminating the need for an external diode in delayed-reset circuits. It conducts when V_OUT goes high and the capacitor voltage exceeds ~0.6 V, ensuring predictable reset timeout and reducing BOM count.

Can the ZM33064GTA operate with a 3.3 V supply rail?

No-the ZM33064GTA is designed for 5 V systems with a fixed 4.6 V threshold. Supplying it from 3.3 V will keep the output permanently low, as V_CC never reaches the minimum 4.5 V rising threshold. For 3.3 V rails, use a dedicated 3.08 V or 3.3 V supervisor like the ZM33063 or TLV803.

How does the ZM33064GTA handle supply voltage hysteresis?

Hysteresis is implemented via internal feedback that shifts the comparator's switching point: rising threshold is 4.59–4.70 V, falling threshold is 4.50–4.59 V, yielding ≥10 mV (typical 20 mV) separation. This prevents output oscillation during slow or noisy supply transitions near the trip point.

Is the SOT223 package of ZM33064GTA RoHS-compliant?

Yes-ZM33064GTA was manufactured by Zetex prior to its acquisition by Diodes Incorporated and conforms to RoHS Directive 2002/95/EC. The SOT223 package uses lead-free terminations and halogen-free molding compound, verified per JEDEC J-STD-020 and J-STD-033 standards.