Diodes Incorporated AZ7031RTR-E1

Overview

AZ7031RTR-E1 from BCD Semiconductor Manufacturing Limited is a precision voltage detector IC with 3.1 V detection threshold, open-collector output, and ±0.01 %/°C temperature coefficient-designed for reliable power-on reset and brown-out monitoring in microcontroller-based systems operating from 0.8 V to 18 V supply rails.

For engineers reviewing the AZ7031RTR-E1 datasheet, AZ7031RTR-E1 pinout, AZ7031RTR-E1 application, or AZ7031RTR-E1 equivalent, this device delivers deterministic reset timing (tpHL = 10 µs, tpLH = 15 µs), low quiescent current (30 µA typical at 5.25 V), and built-in 50 mV hysteresis to reject supply noise in battery-powered and industrial embedded applications.

Technical Context

The AZ7031RTR-E1 implements a precision bandgap reference and comparator architecture to monitor VCC against a fixed 3.1 V threshold (VDET− = 2.95 V, VDET+ = 3.25 V). Its open-collector output requires an external pull-up resistor and asserts active-low when VCC falls below VDET−, remaining valid down to 0.8 V minimum operating voltage.

It operates across −40 °C to +85 °C with thermal resistance θJC = 74 °C/W (SOT-89), supports 20 mA sink current at 25 °C, and maintains detect voltage stability via on-chip hysteresis and low temperature drift-enabling robust reset generation without external components.

Key Specifications

Pinout & Package

The AZ7031RTR-E1 is housed in a SOT-89 surface-mount package (4.4 × 4.6 × 1.1 mm) with gull-wing leads and exposed thermal pad for enhanced power dissipation (PD = 500 mW at TA = 25 °C).

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 AZ7031RTR-E1 offers superior brown-out resilience (0.8 V min op), lower temperature drift (±0.01 %/°C), and tighter hysteresis control-making it optimal for industrial and battery-critical systems requiring deterministic reset behavior under marginal supply conditions.

Availability

AZ7031RTR-E1 is available at Aetrix Electronics and suitable for low-battery detection, processor reset generation, power-fail indication, and battery backup control requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production programs.

Supply support for AZ7031RTR-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 IC design and wafer fabrication company specializing in high-reliability power management and signal conditioning solutions for industrial, automotive, and consumer markets.

The AZ70XX series belongs to BCD's precision voltage monitoring product line, engineered specifically for accurate, low-power reset and supervision functions in resource-constrained embedded systems with demanding environmental and longevity requirements.

FAQ

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

A 10 kΩ pull-up resistor to VCC is recommended for standard logic interfacing, delivering ~0.3 V low-level output at 20 mA sink while limiting quiescent current to <1 µA when inactive. Values between 4.7 kΩ and 100 kΩ are acceptable depending on speed and noise immunity requirements.

Does AZ7031RTR-E1 require decoupling capacitance on VCC?

Yes-a 0.1 µF ceramic capacitor placed within 2 mm of the VCC and GND pins is required to suppress high-frequency noise and ensure stable reference operation. Larger bulk capacitance (e.g., 10 µF) may be added upstream for transient suppression but is not mandatory for basic functionality.

Can AZ7031RTR-E1 operate from a 1.2 V supply?

No-while the device remains functional down to 0.8 V, its 3.1 V detection threshold means it cannot monitor supplies below that level. For 1.2 V rail monitoring, use AZ7012RTR-E1 (1.2 V variant) or consider a dedicated low-VDD supervisor IC.

Is AZ7031RTR-E1 RoHS compliant and lead-free?

Yes-the "E1" suffix confirms full RoHS compliance per EU Directive 2011/65/EU, with lead-free terminations and green molding compound meeting JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements for standard SMT reflow processes.