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Diodes Incorporated AZ809NSTR-G1
- Part No.:
- AZ809NSTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ809NSTR-G1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
AZ809NSTR-G1 from BCD Semiconductor Manufacturing Limited is a 3-pin microprocessor supervisory IC that monitors VCC supply voltage (3.0V/3.3V/5.0V) and asserts an active-low reset signal during power-up, power-down, or brown-out events. It features a factory-programmed 3.08V detection threshold (T variant), 240ms typical reset timeout, 8μA typical supply current at 3.3V, and operates across –40°C to +105°C in SOT-23 package - used in battery-powered handheld equipment for reliable system initialization.
For engineers reviewing the AZ809NSTR-G1 datasheet, AZ809NSTR-G1 pinout, AZ809NSTR-G1 application, or AZ809NSTR-G1 equivalent, key selection criteria include reset threshold accuracy (±30mV at 25°C), guaranteed 140ms minimum timeout, low-quiescent-current operation, and compatibility with Maxim MAX809 replacement requirements in space-constrained embedded systems.
Technical Context
The AZ809NSTR-G1 implements a precision bandgap reference and comparator-based monitoring circuit that triggers reset when VCC falls below its fixed 3.08V threshold (T variant), with ±0.003%/°C temperature coefficient. The internal timer ensures reset remains asserted for ≥140ms after VCC recovers above threshold.
It requires no external components, supports full industrial temperature range (–40°C to +105°C), and delivers rail-to-rail output drive capability: VOL ≤0.3V at 1.2mA sink (AZ809), VOH ≥0.8VCC at 500μA source - enabling direct interface with 3.3V and 5V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detect Voltage | 3.08V ±30mV at 25°C - precisely matches 3.3V supply brown-out detection with minimal margin loss |
| Reset Timeout | 240ms typical, 140ms minimum - ensures sufficient hold time for microcontroller core and peripheral initialization |
| Supply Current | 8μA typical at 3.3V/25°C - enables multi-year battery life in always-on portable instrumentation |
| Operating Temp | –40°C to +105°C - validated for automotive cabin and industrial control environments without derating |
| Output Type | Active-low RESET - directly compatible with standard microcontroller /RESET inputs requiring low-active assertion |
| Package | SOT-23 - 2.9mm × 1.3mm footprint supports high-density PCB layouts in handheld devices |
Pinout & Package
Supplied in industry-standard SOT-23 package (2.9mm × 1.3mm × 1.0mm height), with gull-wing leads, RoHS-compliant green molding compound (G1 suffix), and Pb-free terminations (E1-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal voltage reference and comparator - must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low open-drain reset output - requires external pull-up to VCC or logic rail; sinks ≥1.2mA for clean logic-level assertion |
| 3 | VCC | Power input (1.2V–5.5V) - supplies internal reference, comparator, and timer; decoupling capacitor recommended within 5mm |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage detection | 3.08V threshold with ±30mV tolerance at 25°C - eliminates need for external resistor divider calibration |
| No external components required | Self-contained supervision - reduces BOM count and layout area versus discrete RC-reset solutions |
| Guaranteed reset timeout | 140ms minimum pulse width - meets ARM Cortex-M and RISC-V MCU reset timing requirements |
| Ultra-low quiescent current | 8μA typical at 3.3V - extends battery runtime in always-on IoT edge nodes and medical wearables |
Applications
| Embedded Controllers | Battery Operated Systems |
|---|---|
Use Scenario: Microcontroller-based HVAC controller with EEPROM data retention and watchdog supervision. IC Role / Device Role / Timing Role: Monitors 3.3V main supply and asserts /RESET during AC brown-outs to prevent corrupted firmware writes. Use Value: Prevents flash memory corruption by guaranteeing ≥140ms reset hold time before CPU release - validated across –25°C to +85°C operating range. | Use Scenario: Portable gas detector powered by two AA alkaline cells (1.8V–3.2V range). IC Role / Device Role / Timing Role: Detects falling VCC below 3.08V and holds system in reset until battery replaces or recovers. Use Value: 8μA supply current extends usable battery life by >12 months in sleep mode; SOT-23 footprint minimizes PCB area. |
| Intelligent Instruments | Wireless Communication Systems |
Use Scenario: Handheld multimeter with LCD, ADC, and Bluetooth LE radio. IC Role / Device Role / Timing Role: Provides synchronized reset to MCU and analog front-end upon cold start or low-battery condition. Use Value: Factory-trimmed 3.08V threshold ensures accurate trip point without calibration; operates reliably at 105°C ambient in sealed enclosures. | Use Scenario: LPWAN node using LoRa transceiver and STM32L4 MCU. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output feeding RF section and digital core. Use Value: Active-low RESET output interfaces directly with STM32L4's NRST pin; 240ms typical timeout accommodates slow LDO startup transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD+T | Same 3.08V threshold, but 140ms min timeout only (no typical spec); 10μA max ICC vs. AZ809's 8μA typ | Identical pinout and function; slightly higher max supply current may impact ultra-low-power designs | Select MAX809TRD+T if legacy Maxim qualification or long-term availability assurance is required |
| TPS3808G30DBVR | Adjustable threshold via external resistor; 200ms fixed timeout; 1.6μA typical ICC - lower current but requires external component | Requires resistor network for 3.08V setting; not drop-in due to different pinout (5-pin SOT-23-5) | Choose TPS3808G30DBVR only when programmable threshold or sub-2μA current is mandatory |
Compared with MAX809TRD+T and TPS3808G30DBVR, the AZ809NSTR-G1 offers the lowest typical supply current among fixed-threshold 3-pin supervisors while maintaining identical SOT-23 pin compatibility and guaranteed minimum timeout - making it optimal for cost-sensitive, space-constrained, battery-powered applications where design simplicity is critical.
Availability
AZ809NSTR-G1 is available at Aetrix Electronics and suitable for embedded controllers, battery-operated systems, and intelligent instruments requiring stable component supply with green RoHS-compliant packaging and extended temperature support.
Supply support for AZ809NSTR-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 fabless analog IC designer specializing in power management, protection, and supervisory circuits for industrial, automotive, and consumer markets.
The AZ809/810 series was developed as a cost-optimized, pin-compatible replacement for Maxim's legacy reset supervisors - targeting high-volume portable and embedded applications where reliability, low power, and small footprint are essential.
FAQ
What is the exact reset threshold voltage for AZ809NSTR-G1?
The AZ809NSTR-G1 is the T-variant of the AZ809 family, with a factory-programmed reset threshold of 3.08V. At 25°C, the specification is 3.04V (min) to 3.11V (max); over –40°C to +85°C, it shifts to 3.00V–3.15V, and at +85°C to +105°C, it ranges from 2.92V to 3.23V - all values confirmed in the official datasheet Rev. 1.4.
Does AZ809NSTR-G1 require an external pull-up resistor on the RESET pin?
Yes - the RESET pin is an open-drain output and must be pulled up to the target logic rail (e.g., 3.3V or 5V) via an external resistor. Typical values range from 10kΩ to 100kΩ. This ensures proper logic-high level when inactive and allows multiple devices to share a common reset bus in wired-OR configurations.
Can AZ809NSTR-G1 monitor a 2.5V supply?
No - the AZ809NSTR-G1 is factory-trimmed to 3.08V and is not specified for reliable operation below 3.0V. For 2.5V systems, consider the R-variant (2.63V) or S-variant (2.93V) of the same family, such as AZ809NRTR-G1 or AZ809NSR-G1, both offered in identical SOT-23 packaging and temperature range.
Is AZ809NSTR-G1 pin-compatible with MAX809?
Yes - AZ809NSTR-G1 uses the same SOT-23 package and identical pinout (VCC–GND–RESET) as the MAX809. It is explicitly positioned as an improved replacement with tighter threshold tolerance, lower typical supply current (8μA vs. 10μA), and guaranteed 140ms minimum timeout - verified in BCD's datasheet Section 1 and Ordering Information table.
AZ809NSTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AZ809NSTR-G1 FAQ
1.How can I place an order for AZ809NSTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ809NSTR-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 AZ809NSTR-G1 reliable?
The price and inventory of AZ809NSTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ809NSTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ809NSTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ809NSTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ809NSTR-G1?
AZ809NSTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ809NSTR-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 AZ809NSTR-G1?
For technical support, including AZ809NSTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ809NSTR-G1 requirements.
6.How does Aetrix verify that AZ809NSTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ809NSTR-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 AZ809NSTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ809NSTR-G1?
All AZ809NSTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ809NSTR-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 AZ809NSTR-G1 part is unused and in its original packaging.
Return procedure for AZ809NSTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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