Diodes Incorporated ZM33064GTC

Overview

ZM33064GTC from Zetex Semiconductors is a three-terminal under-voltage monitor IC for microprocessor power-on reset and brownout detection in 5 V systems. It features a fixed 4.6 V threshold, 20 mV hysteresis, open-collector output sinking ≥10 mA, guaranteed operation from 1.0 V to 6.5 V supply, and internal clamp diode for RC delay network discharge.

For engineers reviewing the ZM33064GTC datasheet, ZM33064GTC pinout, ZM33064GTC application, or ZM33064GTC equivalent, key selection criteria include precise 4.6 V trip point, low quiescent current (200 µA at 5 V), open-collector interface compatibility, temperature-stable threshold (±15 mV over −40°C to +85°C), and TO-92 through-hole package suitability for legacy or high-reliability board layouts.

Technical Context

The ZM33064GTC integrates a precision bandgap voltage reference and comparator with built-in hysteresis to eliminate oscillation near threshold. Its output remains low during power-up until V_CC exceeds 4.61 V (rising edge) and reasserts low if V_CC drops below 4.59 V (falling edge), delivering deterministic reset timing.

It operates down to 1.0 V input, enabling early power-on reset assertion before system logic powers up. The internal clamp diode (V_F = 1.2 V at 10 mA) discharges external timing capacitors automatically, eliminating need for discrete discharge components in RC-based reset delay circuits.

Key Specifications

Pinout & Package

The ZM33064GTC is supplied in TO-92 package (suffix C), with leads configured as Input (V_CC), Ground, and Open-Collector Output (active-low).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TLV803EB26DBZR, the ZM33064GTC uniquely combines 4.6 V trip accuracy, integrated clamp diode, TO-92 package, and 1.0 V minimum operation-making it optimal for cost-sensitive, legacy-compatible, or high-reliability 5 V reset applications where BOM simplification and robustness outweigh ultra-low I_Q needs.

Availability

ZM33064GTC is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and legacy PC peripheral cards requiring stable component supply and long-term obsolescence management.

Supply support for ZM33064GTC 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 industrial-grade specifications.

The ZM33064 belongs to Zetex's voltage supervisor product line, designed specifically for deterministic power-on reset and brownout protection in microprocessor-based systems operating from 1 V to 6.5 V rails.

FAQ

What is the exact threshold voltage tolerance over temperature?

The ZM33064GTC has a threshold voltage of 4.6 V nominal, with min/max values of 4.5 V and 4.7 V across −40°C to +85°C. Typical variation is ±15 mV over this range, verified per Issue 4 datasheet Figure 8 (Threshold Voltage vs. Temperature).

Can the ZM33064GTC drive a microcontroller reset pin directly?

Yes-the open-collector output sinks ≥10 mA at 4.0 V supply and exhibits ≤1.0 V saturation voltage, fully compatible with standard CMOS/TTL reset inputs. A 4.7–10 kΩ pull-up resistor to the host logic rail is required for proper logic-level translation.

Does the TO-92 package support reflow soldering?

No-ZM33064GTC in TO-92 (suffix C) is intended for through-hole wave or hand soldering. Its plastic package is not rated for lead-free reflow profiles; use SO8 (N8) or SOT223 (G) variants for surface-mount reflow assembly.

How does the internal clamp diode function in reset delay circuits?

The internal clamp diode connects between the output pin and ground. When the output goes high-impedance after reset release, the diode conducts to discharge the external RC timing capacitor, ensuring predictable and repeatable reset pulse width without adding discrete components.