Diodes Incorporated AZ7027ZTR-G1

Overview

AZ7027ZTR-G1 from BCD Semiconductor Manufacturing Limited is a precision under-voltage detector IC with 2.7 V detection threshold, open-collector output, and built-in 50 mV hysteresis. It monitors power supply rails in CPU reset circuits and battery-backed systems, operating from 0.8 V to 18 V with 30 µA quiescent current at 5.25 V and -40°C to +85°C temperature range.

For engineers reviewing the AZ7027ZTR-G1 datasheet, AZ7027ZTR-G1 pinout, AZ7027ZTR-G1 application, or AZ7027ZTR-G1 equivalent, this device serves as a low-power, temperature-stable reset generator for embedded microcontrollers, portable electronics, and industrial power monitoring where accurate voltage supervision below 3 V is required.

Technical Context

The AZ7027ZTR-G1 uses an on-chip precision voltage reference and comparator to detect falling VCC below 2.7 V (±0.15 V tolerance), triggering an active-low open-collector output after 10 µs propagation delay. Hysteresis of 50 mV prevents chatter during noisy or slowly varying supply conditions.

It operates down to 0.8 V minimum supply voltage, ensuring valid output state during brown-out recovery. Output sinking capability is 16 mA over full temperature range, with low-level output voltage ≤0.4 V at 200 Ω load - enabling direct interface with TTL/CMOS logic and pull-up resistors.

Key Specifications

Pinout & Package

AZ7027ZTR-G1 is supplied in SOT-89 package (3-pin, surface-mount), with thermal pad for enhanced power dissipation up to 500 mW at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB27DBZR and APX803S-27SA-7, AZ7027ZTR-G1 offers superior thermal robustness (-40°C to +85°C), SOT-89 power handling (500 mW), and proven hysteresis stability - making it preferred for industrial-grade reset supervision where reliability under wide temperature and load variation is critical.

Availability

AZ7027ZTR-G1 is available at Aetrix Electronics and suitable for processor reset generation, battery backup control, low-battery detection, and power-fail indication requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for AZ7027ZTR-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 protection devices for industrial and consumer markets.

AZ7027ZTR-G1 belongs to the AZ70XX series of voltage detectors - engineered for accurate, low-power supply monitoring in cost-sensitive embedded systems where reset integrity and thermal resilience are essential.

FAQ

What is the function of the exposed thermal pad on AZ7027ZTR-G1?

The exposed thermal pad (Pin 1 / Tab) is electrically connected to GND and must be soldered to a PCB copper pour for both thermal dissipation and electrical stability. It improves power handling from 400 mW (TO-92) to 500 mW and reduces junction-to-board thermal resistance by ~30%, critical for sustained 16 mA output sinking.

Can AZ7027ZTR-G1 be used with a 1.8 V supply rail?

No - AZ7027ZTR-G1 requires minimum 0.8 V to maintain defined output behavior, but its 2.7 V detection threshold is incompatible with 1.8 V rails. For 1.8 V supervision, use AZ7018 variants (not offered in ZTR-G1 packaging); the 2.7 V threshold ensures reliable reset only on ≥3.0 V nominal supplies.

How does hysteresis improve noise immunity in AZ7027ZTR-G1?

Hysteresis adds 50 mV offset between detection (2.7 V) and release (2.75 V) thresholds, preventing rapid output toggling when VCC fluctuates near the trip point due to switching noise or ripple. This eliminates false resets without requiring external RC filtering or software debouncing.

Is AZ7027ZTR-G1 RoHS and green-compliant?

Yes - the "G1" suffix denotes BCD Semiconductor's green package (halogen-free, lead-free molding compound), and the part meets RoHS Directive 2011/65/EU requirements. It is also compliant with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) for standard SMT assembly.