Diodes Incorporated AZ7042ZTR-G1

Overview

AZ7042ZTR-G1 from BCD Semiconductor Manufacturing Limited is a precision under-voltage detector IC with 4.2 V detection threshold, open-collector output, and ±0.01 %/°C temperature coefficient. It operates from 0.8 V minimum supply, consumes only 30 µA typical quiescent current in inactive state, and delivers 16 mA sink capability at VCC = VDET(min)−0.05 V. Used for reliable CPU reset generation in embedded microcontroller systems during power-up and brownout events.

For engineers reviewing the AZ7042ZTR-G1 datasheet, AZ7042ZTR-G1 pinout, AZ7042ZTR-G1 application, or AZ7042ZTR-G1 equivalent, key selection criteria include detect voltage accuracy (4.05–4.35 V), hysteresis (30–100 mV), low operating voltage headroom (0.8 V), open-collector interface compatibility, and SOT-89 thermal performance (θJC = 74 °C/W).

Technical Context

The AZ7042ZTR-G1 implements a precision bandgap reference and comparator architecture to monitor VCC against a fixed 4.2 V threshold. Its built-in hysteresis (typ. 50 mV) ensures noise immunity during voltage transients near the trip point.

It features an open-collector NPN output stage that sinks up to 16 mA across −40 to +85 °C, with guaranteed low-level output voltage ≤0.4 V at RL = 200 Ω. Reset assertion occurs when VCC falls below VDET− (4.05 V min); release occurs only after VCC rises above VDET+ (4.35 V max), preventing chatter during slow-rising or noisy supplies.

Key Specifications

Pinout & Package

SOT-89 package: 3-pin surface-mount plastic package with exposed thermal pad (θJC = 74 °C/W), footprint compatible with JEDEC TO-243AA. Pin 1 = VCC, Pin 2 = GND, Pin 3 = OUT (open-collector NPN emitter grounded internally).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803DBZT and MAX809SEUR+T, AZ7042ZTR-G1 uniquely balances 4.2 V precision detection, 16 mA sink drive, SOT-89 thermal capability, and industrial temperature support-making it optimal for 4.2 V brownout protection in thermally demanding embedded controllers.

Availability

AZ7042ZTR-G1 is available at Aetrix Electronics and suitable for processor reset generation, power fail indication, battery backup control, and home appliance supervisory circuits requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AZ7042ZTR-G1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and mixed-signal IC designer and foundry, specializing in high-reliability power management and sensing solutions for industrial and consumer markets.

AZ7042ZTR-G1 belongs to the AZ70XX series of voltage detectors-designed specifically for accurate, low-power supply monitoring and system reset in cost-sensitive embedded applications where precision, thermal robustness, and green packaging are essential.

FAQ

What is the exact detect voltage tolerance and temperature drift of AZ7042ZTR-G1?

The AZ7042ZTR-G1 has a detect voltage range of 4.05 V to 4.35 V at 25 °C, with ±0.01 %/°C temperature coefficient. Over −40 to +85 °C, total drift remains within ±1.2% of nominal 4.2 V, verified per datasheet Figure 7 and Electrical Characteristics table.

Can AZ7042ZTR-G1 drive a 10 kΩ pull-up resistor directly to 3.3 V?

Yes. With VOL ≤0.4 V at RL = 200 Ω and 16 mA sink capability, it easily pulls down a 10 kΩ pull-up to <0.1 V at 3.3 V. The output remains valid down to 0.8 V VCC, ensuring reliable reset assertion even during deep brownout conditions.

Is AZ7042ZTR-G1 RoHS compliant and halogen-free?

Yes. The "G1" suffix denotes BCD's green package variant, fully compliant with RoHS Directive 2011/65/EU and halogen-free per IEC 61249-2-21. No lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE is present above threshold limits.

Does AZ7042ZTR-G1 require an external capacitor for stability?

No. The AZ7042ZTR-G1 is internally compensated and requires no external capacitor. Its propagation delays (tpHL = 10 µs, tpLH = 15 µs) are specified with CL = 100 pF and RL = 1 kΩ, confirming stable operation without added capacitance in standard reset configurations.