Diodes Incorporated AZ7045RTR-G1

Overview

AZ7045RTR-G1 from BCD Semiconductor Manufacturing Limited is a precision voltage detector IC with 4.5 V detection threshold, open-collector output, and SOT-89 package. It monitors supply rails in embedded systems, generates reliable reset signals during power-on/off transients, and operates down to 0.8 V supply while consuming only 30 µA in standby mode. Designed for CPU reset generation and battery backup control in industrial and home appliance applications.

For engineers reviewing the AZ7045RTR-G1 datasheet, AZ7045RTR-G1 pinout, AZ7045RTR-G1 application, or AZ7045RTR-G1 equivalent, this page delivers verified electrical parameters, thermal performance data, hysteresis behavior, and real-world use cases - all validated against BCD's official Rev. 2.2 datasheet (Oct. 2011).

Technical Context

The AZ7045RTR-G1 uses an on-chip precision voltage reference and comparator to detect when VCC falls below 4.5 V (±0.15 V) or rises above 4.55 V (VDET+ = VDET− + VHYS). Its built-in 50 mV typical hysteresis prevents oscillation near threshold under noisy supply conditions.

It features open-collector output capable of sinking 16 mA across −40°C to +85°C, with propagation delays of 10 µs (falling edge) and 15 µs (rising edge) into 1 kΩ/100 pF load. Minimum operating voltage is 0.8 V, enabling valid output assertion even during deep brown-out conditions.

Key Specifications

Pinout & Package

The AZ7045RTR-G1 is housed in a 3-pin SOT-89 surface-mount package with exposed thermal pad (mechanical dimensions per Rev. 2.2 datasheet, Oct. 2011). Pin 1 is VCC, Pin 2 is GND, and Pin 3 is open-collector OUT.

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 AZ7045RTR-G1 offers tighter threshold accuracy (±0.15 V vs ±0.25 V), higher output drive (16 mA vs ≤4 mA), and integrated hysteresis - making it optimal for cost-sensitive industrial applications requiring robust reset signaling without external components.

Availability

AZ7045RTR-G1 is available at Aetrix Electronics and suitable for processor reset generation, battery backup control, low-battery detection, and home appliance power supervision requiring stable component supply across production lifecycles.

Supply support for AZ7045RTR-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 IC designer and foundry with expertise in power management, protection, and sensing solutions for industrial and consumer markets.

The AZ70XX series was developed specifically for accurate, low-power supply monitoring in cost-sensitive embedded systems - emphasizing threshold stability, wide temperature operation, and minimal external component count.

FAQ

What is the absolute maximum supply voltage for AZ7045RTR-G1?

The absolute maximum supply voltage is 20 V, but recommended operating voltage is up to 18 V. Exceeding 20 V risks permanent damage per datasheet Absolute Maximum Ratings. At 18 V, the device draws <500 µA and maintains full functionality across its −40°C to +85°C range.

Does AZ7045RTR-G1 require an external pull-up resistor on the output?

Yes - the open-collector output requires an external pull-up resistor to define the high state. Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus loading. No internal pull-up is present; omission results in undefined logic-high behavior.

How does hysteresis affect reset release timing in AZ7045RTR-G1?

Hysteresis sets the release voltage at 4.55 V (4.5 V + 50 mV typical), meaning the output remains low until VCC rises above that level. This prevents repeated toggling during slow or noisy supply recovery, ensuring one clean deassertion after power stabilizes.

Can AZ7045RTR-G1 operate from a 3.3 V supply rail?

No - its 4.5 V detection threshold and minimum operating voltage of 0.8 V do not support reliable operation on 3.3 V rails. For 3.3 V systems, AZ7033RTR-G1 (3.3 V threshold) is the functionally matched variant in the same SOT-89 package.