Diodes Incorporated AZ7031ZTR-G1

Overview

AZ7031ZTR-G1 from BCD Semiconductor Manufacturing Limited is a precision voltage detector IC with 3.1 V detection threshold, open-collector output, and built-in 50 mV hysteresis. It monitors power supply rails in CPU reset circuits and battery backup systems, operating from 0.8 V to 18 V with ±0.01 %/°C temperature coefficient and -40 to 85 °C industrial temperature range.

For engineers reviewing the AZ7031ZTR-G1 datasheet, AZ7031ZTR-G1 pinout, AZ7031ZTR-G1 application, or AZ7031ZTR-G1 equivalent, this device serves as a low-power (30 µA typical off-state current), noise-immune supply monitor for embedded logic systems requiring accurate, repeatable reset assertion during brown-out and power-up events.

Technical Context

The AZ7031ZTR-G1 implements a bandgap-referenced comparator architecture with internal hysteresis to reject supply noise and prevent chatter during threshold crossing. Its output remains undefined below 0.8 V (VOPR), transitions low within 10 µs after VCC falls below 2.95 V (VDET−), and releases high within 15 µs after VCC rises above 3.25 V (VDET+).

It features an open-collector output capable of sinking 16 mA across -40 to 85 °C, requiring an external pull-up resistor. The device draws only 30 µA at 5.25 V (ICCH) and 300 µA near detection (ICCL), enabling long-life battery operation in low-voltage indicator and fail-safe monitoring applications.

Key Specifications

Pinout & Package

The AZ7031ZTR-G1 is supplied in SOT-89 package (3-pin, surface-mount), with thermal pad exposed on underside for enhanced power dissipation (θJC = 74 °C/W). Pin 1 = VCC, Pin 2 = GND, Pin 3 = OUT (open-collector).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803DBZT and MAX809SEUR+T, the AZ7031ZTR-G1 offers higher hysteresis (50 mV vs. ~10 mV), wider supply range (0.8–18 V vs. 1–6 V), and SOT-89 thermal performance-making it optimal for noisy industrial rails and extended-temperature deployments where robustness outweighs ultra-low ICC.

Availability

AZ7031ZTR-G1 is available at Aetrix Electronics and suitable for battery backup control, processor reset generation, low-battery detection, and power-fail indication requiring stable component supply across industrial, automotive, and consumer electronics programs.

Supply support for AZ7031ZTR-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 design and foundry company specializing in high-reliability power management and sensing solutions for industrial and automotive markets.

The AZ70XX series belongs to BCD's precision voltage supervisor product line, engineered for cost-sensitive, high-volume applications demanding accurate, low-power supply monitoring with minimal external components.

FAQ

What is the recommended pull-up resistor value for the open-collector output?

A 10 kΩ pull-up to 3.3 V or 5 V is recommended to ensure fast rise time while limiting current to ≤0.33 mA. Lower values (e.g., 4.7 kΩ) improve noise immunity but increase static power; higher values (>100 kΩ) risk slow edges and susceptibility to leakage-induced false triggers.

Can AZ7031ZTR-G1 operate with a 1.8 V supply rail?

No. While the device operates down to 0.8 V minimum, its 3.1 V detection threshold requires VCC ≥3.1 V to assert reset. For 1.8 V systems, use AZ7018ZTR-G1 (1.8 V variant) - the AZ7031ZTR-G1 is designed specifically for 3.3 V domain supervision.

Does the device require an external capacitor on the VCC pin?

Yes. A 10 µF ceramic or tantalum bypass capacitor placed close to the VCC and GND pins is required per Figure 4 in the datasheet to stabilize the internal reference and suppress supply transients that could cause false detection.

Is the SOT-89 package thermally enhanced compared to TO-92?

Yes. The SOT-89 package has θJC = 74 °C/W versus TO-92's 72 °C/W, and its exposed thermal pad allows direct PCB copper pour connection, enabling up to 2× higher continuous power dissipation in compact layouts-critical for high-current reset loads in space-constrained designs.