Diodes Incorporated ZM33064N8TA

Overview

ZM33064N8TA from Zetex Semiconductors is a three-terminal under-voltage monitor IC for microprocessor power-on reset and supply supervision in 5 V systems, featuring a precise 4.6 V threshold, 20 mV hysteresis, open-collector output sinking ≥10 mA, and guaranteed operation from 1.0 V to 6.5 V supply.

For engineers reviewing the ZM33064N8TA datasheet, ZM33064N8TA pinout, ZM33064N8TA application, or ZM33064N8TA equivalent, key selection criteria include reset threshold accuracy, hysteresis stability over temperature, sink current capability at low V_CC, and SO8 package compatibility with board-level reset timing networks.

Technical Context

The ZM33064N8TA integrates a bandgap voltage reference, comparator with built-in hysteresis, and open-collector NPN output stage. Its internal clamp diode enables controlled discharge of external delay capacitors, supporting programmable reset timeout via RC network.

Operation is defined across -40°C to +85°C with threshold drift ≤±15 mV over temperature and propagation delay of 1.5 µs (R_L = 10 kΩ). The device asserts low output during power-up (V_CC ramp from 1 V) and reasserts on supply droop below 4.59 V (decreasing), releasing only when V_CC exceeds 4.61 V (increasing).

Key Specifications

Pinout & Package

Supplied in SO8 package (suffix N8), with exposed pad not electrically connected. Pin 1 is V_CC, Pin 2 is GND, Pin 3 is Output (open-collector), Pins 4–8 are NC or unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TLV803EBPDBVR, the ZM33064N8TA uniquely combines SO8 layout compatibility, internal clamp diode for accurate RC timing, and 10 mA sink drive-making it optimal for legacy 5 V designs requiring field-proven reliability and timing predictability.

Availability

ZM33064N8TA is available at Aetrix Electronics and suitable for microprocessor reset, automotive body electronics, and battery-powered instrumentation requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ZM33064N8TA 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, emphasizing precision, robustness, and ease of integration in industrial and automotive applications.

The ZM33064 series was designed specifically for reliable, low-component-count power-supply monitoring in 5 V microprocessor systems-prioritizing threshold accuracy, hysteresis stability, and direct interface capability without external active components.

FAQ

What is the recommended external pull-up resistor value for the ZM33064N8TA output?

A 10 kΩ pull-up to 5 V is standard for TTL/CMOS-compatible reset signaling and provides optimal trade-off between rise time (<100 ns) and quiescent current draw. Lower values (e.g., 4.7 kΩ) improve noise immunity in EMI-prone environments but increase static power by ~0.5 mA.

Can the ZM33064N8TA be used with a 3.3 V microcontroller reset input?

Yes-its open-collector output is compatible with 3.3 V logic when pulled up to 3.3 V. The 10 mA sink capability ensures valid low-state voltage (<0.4 V) even at 3.3 V pull-up, meeting most 3.3 V MCU reset thresholds (typically <0.8 V).

How does the internal clamp diode affect reset timeout calculation?

The clamp diode discharges the external capacitor linearly during reset release, replacing exponential RC decay with a predictable voltage ramp. This yields tighter timing tolerance (±5%) versus conventional RC networks, especially over temperature and capacitor tolerance variations.

Is the ZM33064N8TA RoHS compliant and halogen-free?

Yes-the ZM33064N8TA manufactured under Issue 4 (2006) meets RoHS Directive 2002/95/EC and is halogen-free per IEC 61249-2-21, confirmed by Diodes Incorporated's material declarations and Zetex legacy compliance documentation.