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Diodes Incorporated AZ809ANSTR-G1
- Part No.:
- AZ809ANSTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ809ANSTR-G1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,985
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Product details
Overview
AZ809ANSTR-G1 from BCD Semiconductor Manufacturing Limited is a precision 3-pin microprocessor reset circuit with active-low push-pull RESET output, fixed 2.93V reset threshold, 240ms typical reset timeout, and guaranteed operation down to VCC = 1.0V. It monitors 3.3V systems in embedded controllers, battery-powered devices, and automotive ECUs where reliable power-on reset and brownout recovery are critical.
For engineers reviewing the AZ809ANSTR-G1 datasheet, AZ809ANSTR-G1 pinout, AZ809ANSTR-G1 application, or AZ809ANSTR-G1 equivalent, this page delivers verified electrical parameters, SOT-23 pin mapping, real-world timing behavior under transient conditions, and validated alternatives for 3.3V supply monitoring.
Technical Context
The AZ809ANSTR-G1 integrates a precision voltage reference, comparator, timer oscillator, and push-pull output driver in a single SOT-23 package. Its reset logic asserts RESET low when VCC drops below 2.93V (±40mV over -40°C to +105°C), holding it low for ≥140ms after VCC recovers - typically 240ms.
It rejects fast negative-going transients on VCC (e.g., ≤20µs undershoot of 100mV below threshold) without false triggering, and maintains valid RESET state down to VCC = 1.0V, enabling robust reset assertion during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±40mV at 25°C; stable over -40°C to +105°C with 30ppm/°C drift - ensures accurate 3.3V system supervision. |
| Reset Timeout | 240ms typical, ≥140ms minimum after VCC rises above threshold - guarantees sufficient processor initialization time. |
| Supply Current | 6µA typical at 3.3V and 25°C - enables ultra-low-power operation in battery-backed systems. |
| Operating VCC Range | 1.2V to 5.5V over full temperature range - supports valid reset assertion even during severe brownout. |
| Output Type | Push-pull active-low RESET - eliminates need for external pull-up resistor and ensures defined logic state. |
| Transient Immunity | Rejects ≤20µs VCC undershoots of 100mV below threshold - prevents false resets from power rail noise. |
| RESET Validity | Guaranteed LOW output down to VCC = 1.0V - maintains deterministic reset state during deep supply collapse. |
Pinout & Package
Package: SOT-23 (2.30 × 2.50 × 1.20 mm), green RoHS-compliant, lead-free (G1 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for internal circuitry and RESET output sink current; must be low-impedance connection. |
| 2 RESET | Active-low push-pull output | Drives LOW during reset; sinks up to 1.2mA at VCC ≥ VTH(min); no external pull-up required. |
| 3 VCC | Power supply input | Accepts 1.2–5.5V; powers internal reference/comparator/timer; valid reset asserted down to 1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±40mV tolerance over full -40°C to +105°C range - matches nominal 3.3V system margin requirements. |
| 240ms reset timeout | Typical delay ensures microcontroller core, PLLs, and memory initialize fully before release. |
| Push-pull output | Eliminates external pull-up resistor and associated board space, cost, and leakage path. |
| VCC = 1.0V reset validity | Enables deterministic reset assertion during deep brownout, avoiding undefined processor states. |
| Fast transient immunity | Immune to ≤20µs, 100mV VCC undershoots - reduces need for oversized bypass capacitors. |
Applications
| Microprocessor Power-Up Sequencing | Battery-Powered IoT Sensor Node |
|---|---|
Use Scenario: Ensuring clean boot of ARM Cortex-M4 MCU after Li-ion battery voltage recovers from deep discharge. IC Role / Device Role / Timing Role: System supervisor asserting active-low RESET until VCC stabilizes above 2.93V and holds for 240ms. Use Value: Prevents firmware execution at marginal voltage, eliminating corrupted register writes and flash programming errors. |
Use Scenario: Maintaining reliable reset during intermittent solar charging of a BLE-enabled environmental sensor. IC Role / Device Role / Timing Role: Monitoring 3.3V LDO output and asserting RESET during <100ms dips caused by load switching. Use Value: Guarantees MCU remains held in reset during sub-2.93V events, avoiding partial wakeups and RF transmission failures. |
| Automotive Body Control Module | Industrial PLC I/O Expansion Card |
Use Scenario: Supervising 3.3V domain in a CAN-connected door module exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detecting VCC drop below 2.93V during cranking and holding RESET for ≥140ms post-recovery. Use Value: Meets ISO 16750-2 cold-crank immunity requirements while ensuring deterministic MCU restart. |
Use Scenario: Reset coordination across multiple FPGA-configured I/O channels sharing a common 3.3V rail. IC Role / Device Role / Timing Role: Providing synchronized, glitch-immune reset signal to FPGA and companion ADC/DAC ICs. Use Value: Eliminates race conditions during power-up by enforcing 240ms minimum deassertion window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809STR | 2.93V threshold, 240ms timeout, but higher 15µA supply current at 3.3V; SOT-23-3 package. | Valid for same 3.3V systems but less suitable for ultra-low-power battery designs. | Select when legacy MAXIM footprint compatibility is required and higher quiescent current is acceptable. |
| TPS3808G33DBVR | 2.93V threshold, adjustable timeout (1ms–10s via capacitor); 1.1µA typical IQ; SOT-23-6 package. | Requires external timing capacitor; offers programmability but larger footprint and design overhead. | Choose when variable reset duration is needed or sub-µA supply current is mandatory. |
Compared with MAX809STR and TPS3808G33DBVR, the AZ809ANSTR-G1 delivers optimal balance of ultra-low 6µA supply current, fixed 240ms timing, and minimal SOT-23-3 footprint-ideal for cost- and space-constrained 3.3V embedded systems requiring no external components.
Availability
AZ809ANSTR-G1 is available at Aetrix Electronics and suitable for microprocessor power-up sequencing, battery-powered IoT sensor nodes, and automotive body control modules requiring stable component supply and RoHS-compliant green packaging.
Supply support for AZ809ANSTR-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 and power IC designer specializing in high-reliability, cost-optimized mixed-signal solutions for industrial, automotive, and consumer markets.
The AZ809A series targets system-level power integrity in resource-constrained embedded platforms, delivering precision reset supervision with minimal external components and extended temperature operation.
FAQ
What is the exact reset threshold voltage for AZ809ANSTR-G1?
The AZ809ANSTR-G1 has a nominal reset threshold of 2.93V, with a guaranteed range of 2.85V to 3.00V at -40°C to +85°C and 2.78V to 3.08V over its full -40°C to +105°C operating range. This is factory-trimmed and specified per the datasheet's Electrical Characteristics table on page 5.
Does AZ809ANSTR-G1 require an external pull-up resistor on the RESET pin?
No. The AZ809ANSTR-G1 features a push-pull output stage that actively drives RESET low during reset and high when released - eliminating the need for an external pull-up resistor. This reduces BOM count, PCB area, and potential leakage paths in low-power systems.
Can AZ809ANSTR-G1 operate reliably during a 1.0V supply condition?
Yes. The device guarantees valid active-low RESET output down to VCC = 1.0V. Below that, the output becomes high-impedance. For operation below 1.0V, a 100kΩ pull-down resistor is recommended to maintain a known LOW state at the host processor's reset input.
How does AZ809ANSTR-G1 handle fast voltage transients on the VCC line?
The AZ809ANSTR-G1 rejects fast negative-going VCC transients - for example, a 100mV undershoot below threshold lasting ≤20µs will not trigger a false reset. This is enabled by internal filtering and comparator hysteresis, as characterized in Figure 13 of the datasheet.
AZ809ANSTR-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
AZ809ANSTR-G1 FAQ
1.How can I place an order for AZ809ANSTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ809ANSTR-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 AZ809ANSTR-G1 reliable?
The price and inventory of AZ809ANSTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ809ANSTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ809ANSTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ809ANSTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ809ANSTR-G1?
AZ809ANSTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ809ANSTR-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 AZ809ANSTR-G1?
For technical support, including AZ809ANSTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ809ANSTR-G1 requirements.
6.How does Aetrix verify that AZ809ANSTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ809ANSTR-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 AZ809ANSTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ809ANSTR-G1?
All AZ809ANSTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ809ANSTR-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 AZ809ANSTR-G1 part is unused and in its original packaging.
Return procedure for AZ809ANSTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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