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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Diodes Incorporated AZ7042RTR-G1

Name: AZ7042RTR-G1
Brand: Diodes Incorporated
SKU: AZ7042RTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AZ7042RTR-G1

Manufacturer:: Diodes Incorporated

Category:: Supervisors

Package:: TO-243AA

Datasheet:: AZ7042RTR-G1.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT89

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AZ7042RTR-G1 from BCD Semiconductor Manufacturing Limited is a precision voltage detector IC with 4.2 V threshold, open-collector output, and SOT-89 package. It monitors supply rails in microcontroller-based systems, generating a reset signal when V_CC falls below 4.05 V (min) or rises above 4.35 V (max), with 50 mV typical hysteresis. Designed for CPU reset generation and battery backup control, it operates from -40°C to +85°C with 30 µA typical quiescent current at 5.25 V.

For engineers reviewing the AZ7042RTR-G1 datasheet, AZ7042RTR-G1 pinout, AZ7042RTR-G1 application, or AZ7042RTR-G1 equivalent, this device serves as a low-power, temperature-stable reset supervisor for embedded power monitoring where precise 4.2 V detection and noise immunity are required.

Technical Context

The AZ7042RTR-G1 integrates a precision on-chip voltage reference and comparator to compare V_CC against a fixed 4.2 V threshold. Its hysteresis of 30–100 mV prevents chatter during slow or noisy supply transitions.

It features open-collector output requiring external pull-up, supports minimum operating voltage down to 0.8 V, and delivers 16 mA sink current across -40°C to +85°C. Reset assertion occurs after 10 µs (tp_HL) when V_CC drops below V_DET−, and release occurs after 15 µs (tp_LH) when V_CC exceeds V_DET+.

Key Specifications

Parameter	Value and Actual Design Meaning
Detect Voltage	4.2 V nominal (4.05–4.35 V range); sets exact reset trigger point for 4.2 V supply rails
Hysteresis Voltage	50 mV typical (30–100 mV); ensures stable output during supply ripple or slow ramping
Quiescent Current	30 µA typical at 5.25 V; enables ultra-low-power operation in battery-backed systems
Output Type	Open-collector; allows flexible pull-up voltage selection and wired-OR reset bus configuration
Min Operating Voltage	0.8 V typical; guarantees valid reset behavior even during deep brown-out conditions
Propagation Delay	10 µs (tp_HL), 15 µs (tp_LH); provides deterministic timing for synchronous system initialization
Operating Temp	-40°C to +85°C; qualified for industrial-grade embedded and appliance applications

Pinout & Package

SOT-89 package: 3-pin surface-mount, thermally enhanced plastic case with exposed tab (pin 3 = GND). Pin 1: V_CC, Pin 2: GND, Pin 3: OUT (open-collector).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	V_CC	Supply input; powers internal reference and comparator; must be ≥0.8 V for valid operation
Pin 2	GND	Analog ground reference; connects to PCB ground plane; shared with thermal pad for heat dissipation
Pin 3	OUT	Open-collector output; sinks up to 16 mA; requires external pull-up resistor for logic-high state

Key Features

Feature	Design Value
Precision threshold accuracy	±0.15 V over full temperature range ensures reliable reset at 4.2 V supply without calibration
Low-power standby mode	30 µA typical ICC_H extends battery life in always-on monitoring circuits
Noise-immune hysteresis	50 mV typical VHYS suppresses false resets caused by supply transients or EMI
Robust output drive	16 mA sink capability at -40°C to +85°C supports direct interface to MCU reset pins
Wide supply tolerance	Operates up to 18 V V_CC, enabling use in 5 V, 12 V, and mixed-rail systems

Applications

Processor Reset Generator

Battery Backup Control

Use Scenario: Power-up sequencing and brown-out protection for ARM Cortex-M and 8-bit microcontrollers.

IC Role / Device Role / Timing Role: Generates active-low reset pulse upon V_CC crossing 4.2 V threshold with 10 µs delay; holds reset until stable supply is confirmed.

Use Value: Prevents CPU lockup or undefined execution during unstable power conditions using factory-trimmed 4.2 V detection.

Use Scenario: Monitoring main supply voltage to enable switchover to backup battery in smart meters and IoT sensors.

IC Role / Device Role / Timing Role: Detects main rail collapse below 4.05 V and asserts signal to enable backup regulator or SRAM retention circuit.

Use Value: Ensures zero-interruption data retention via deterministic 4.2 V threshold and 50 mV hysteresis.

Low Battery Voltage Detector

Power Fail Indicator

Use Scenario: End-of-life warning in lithium-ion powered portable devices (e.g., medical monitors, handheld test equipment).

IC Role / Device Role / Timing Role: Triggers LED or alert signal when battery voltage drops to 4.2 V, indicating ~10% remaining capacity.

Use Value: Delivers accurate, temperature-compensated detection (±0.01 %/°C) without external components.

Use Scenario: Early warning of AC/DC adapter failure in home appliances such as washing machines and air conditioners.

IC Role / Device Role / Timing Role: Drives optocoupler or status LED when 5 V rail falls below 4.05 V, signaling imminent shutdown.

Use Value: Enables graceful system shutdown and fault logging before complete power loss.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV803EB42DBZR	4.2 V threshold, 350 nA max IQ, SOT-23-3 package, push-pull output	Lower power but no hysteresis; requires external RC network for noise immunity	Select for ultra-low-power battery applications where external hysteresis design is acceptable
MAX809SEUR+T	4.2 V threshold, 15 µA IQ, SOT-23-3, open-collector, ±1.5% accuracy	Narrower temp range (-40°C to +105°C), higher threshold tolerance than AZ7042RTR-G1 (±1.5% vs ±3.6%)	Select for automotive-adjacent designs needing wider temperature margin and tighter initial accuracy

Compared with TLV803EB42DBZR and MAX809SEUR+T, AZ7042RTR-G1 offers superior hysteresis integration (50 mV typical) and higher sink current (16 mA) in SOT-89, making it optimal for industrial reset supervision where robustness and thermal performance outweigh ultra-low IQ requirements.

Availability

AZ7042RTR-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.

Supply support for AZ7042RTR-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 China-based analog and power IC designer specializing in high-reliability, cost-optimized semiconductor solutions for industrial and consumer markets.

AZ7042RTR-G1 belongs to the AZ70XX series of voltage detectors - engineered for accurate, low-power supply monitoring in resource-constrained embedded systems 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 per datasheet test conditions. This ensures ≤0.4 V low-level output while limiting current to <500 µA during reset assertion. Lower values (e.g., 4.7 kΩ) improve noise immunity but increase static power; higher values (>100 kΩ) risk slow rise time and noise susceptibility.

Does AZ7042RTR-G1 require external capacitors for stable operation?

No external capacitors are required for basic voltage detection. However, a 10 µF bypass capacitor between V_CC and GND is recommended near the device to suppress supply noise that could affect detection accuracy. The internal hysteresis eliminates need for external RC networks.

Can AZ7042RTR-G1 monitor voltages above 5 V?

Yes - it supports V_CC up to 18 V per Absolute Maximum Ratings. The 4.2 V detection threshold remains accurate across the full 1.0–18 V operating range, making it suitable for monitoring 12 V rails via resistive divider or directly for 5 V systems.

Is AZ7042RTR-G1 RoHS compliant and halogen-free?

Yes - the "G1" suffix denotes green (halogen-free) packaging, and the part meets RoHS Directive 2011/65/EU. BCD confirms all "G1"-suffixed devices are lead-free and fully compliant with JEDEC J-STD-609A Class 1 moisture sensitivity level.

AZ7042RTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-243AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Voltage Detector

Number of Voltages Monitored:: 1

Voltage - Threshold:: 4.2V

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-3

AZ7042RTR-G1 FAQ

1.How can I place an order for AZ7042RTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AZ7042RTR-G1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AZ7042RTR-G1 reliable?

The price and inventory of AZ7042RTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ7042RTR-G1 is usually 5 days.

3.What payment methods are accepted for AZ7042RTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ7042RTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AZ7042RTR-G1?

AZ7042RTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AZ7042RTR-G1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AZ7042RTR-G1?

For technical support, including AZ7042RTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ7042RTR-G1 requirements.

6.How does Aetrix verify that AZ7042RTR-G1 is sourced from the original manufacturer or authorized distributors?

All AZ7042RTR-G1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AZ7042RTR-G1 meets industry standards.

7.What is the process for return or replacement of AZ7042RTR-G1?

All AZ7042RTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ7042RTR-G1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AZ7042RTR-G1 part is unused and in its original packaging.

Return procedure for AZ7042RTR-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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