Diodes Incorporated AZ7027RTR-E1

Overview

AZ7027RTR-E1 from BCD Semiconductor Manufacturing Limited is a precision voltage detector IC with 2.7 V detection threshold, open-collector output, and SOT-89 package. It monitors supply rails in embedded systems, provides reset signaling during brownout events, and operates down to 0.8 V supply while consuming only 30 µA in standby mode. Used in CPU reset generation and battery backup control circuits.

For engineers reviewing the AZ7027RTR-E1 datasheet, AZ7027RTR-E1 pinout, AZ7027RTR-E1 application, or AZ7027RTR-E1 equivalent, key selection criteria include detect voltage accuracy (±0.15 V), hysteresis (50 mV typical), low operating current, open-collector drive capability (20 mA sink), and -40°C to +85°C industrial temperature range.

Technical Context

The AZ7027RTR-E1 integrates an on-chip precision voltage reference and comparator to compare VCC against a fixed 2.7 V threshold. Detection logic includes built-in hysteresis (VHYS = VDET+ − VDET−) to suppress noise-induced false triggering during supply transients.

Its open-collector output requires external pull-up and sinks up to 20 mA when active (VCC ≥ VDET−), enabling direct interface with microcontroller reset inputs or LED indicators. The device remains functional down to 0.8 V supply, ensuring valid output behavior across wide input droop conditions.

Key Specifications

Pinout & Package

The AZ7027RTR-E1 is housed in a 3-pin SOT-89 surface-mount package with gull-wing leads, thermal pad on underside, and JEDEC-standard footprint (4.4–4.6 mm × 2.3–2.6 mm × 1.5 mm height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB27DPWR and MAX809SEUR+T, AZ7027RTR-E1 offers balanced performance: lower IQ than MAX809SEUR+T, open-collector compatibility like MAX809SEUR+T, and SOT-89 thermal robustness exceeding both alternatives' SOT-23 packages.

Availability

AZ7027RTR-E1 is available at Aetrix Electronics and suitable for industrial control panels, home electric appliances, and battery-powered IoT edge nodes requiring stable component supply across extended production cycles.

Supply support for AZ7027RTR-E1 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 partner, specializing in high-reliability power management and supervisory solutions for industrial and consumer markets.

The AZ70XX series is part of BCD's voltage supervisor product line, engineered for accurate, low-power supply monitoring in cost-sensitive embedded systems where predictable reset behavior and long-term stability are critical.

FAQ

What is the recommended pull-up resistor value for the AZ7027RTR-E1 open-collector output?

For reliable logic-high level with standard 3.3 V or 5 V host systems, use a 10 kΩ pull-up resistor. This balances speed (tpLH < 15 µs), power (I_PULLUP ≈ 330 µA at 3.3 V), and noise immunity. Lower values improve rise time but increase static current; higher values risk noise susceptibility and slower edges.

Does AZ7027RTR-E1 require an external capacitor on VCC for stability?

No external bypass capacitor is required for basic operation, but a 0.1 µF ceramic capacitor placed close to the VCC and GND pins is strongly recommended. This reduces high-frequency noise coupling into the internal reference and comparator, preventing false triggers during fast transients or ESD events.

Can AZ7027RTR-E1 operate from a 1.8 V supply?

No. The AZ7027RTR-E1 requires a minimum operating voltage (VOPR) of 0.8 V to function, but its detect threshold is fixed at 2.7 V. To assert a valid reset, VCC must reach at least 2.7 V - therefore, it cannot supervise 1.8 V rails. For 1.8 V systems, select a detector with matching threshold (e.g., AZ7018 series).

How does hysteresis affect the release voltage of AZ7027RTR-E1?

Hysteresis sets the release voltage (VDET+) at approximately 2.75 V (2.7 V + 50 mV). After VCC falls below 2.7 V and triggers reset, VCC must rise above ~2.75 V to release the output. This 50 mV gap prevents chatter during slow or noisy supply recovery, ensuring clean, single-event reset assertion.