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Diodes Incorporated AZ809ANSTR-E1
- Part No.:
- AZ809ANSTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ809ANSTR-E1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,215
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Product details
Overview
AZ809ANSTR-E1 from BCD Semiconductor Manufacturing Limited is a 3-pin precision microprocessor reset supervisor IC with active-low push-pull RESET output, fixed 2.93V reset threshold, 240ms typical reset timeout, and guaranteed operation down to VCC = 1.0V - used for power-up/brownout monitoring in 3.3V embedded systems.
For engineers reviewing the AZ809ANSTR-E1 datasheet, AZ809ANSTR-E1 pinout, AZ809ANSTR-E1 application, or AZ809ANSTR-E1 equivalent, this page delivers verified electrical specs, SOT-23 pin mapping, real-world timing behavior, transient immunity data, and validated alternatives for industrial and battery-powered system design.
Technical Context
The AZ809ANSTR-E1 implements a precision voltage comparator with internal reference and a monostable timer to generate a minimum 140ms (typical 240ms) active-low reset pulse after VCC recovers above 2.93V. Its reset logic remains functional at VCC as low as 1.0V, enabling reliable supervision during deep brownouts.
It features fast transient immunity optimized for negative-going VCC glitches - rejecting transients ≤20µs duration when undershoot is ≤100mV below threshold - and draws only 6µA typical supply current at 3.3V, supporting ultra-low-power portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±40mV (2.78–3.08V over -40°C to +105°C); ensures stable reset assertion for 3.3V systems under temperature variation. |
| Reset Timeout | 240ms typical (140ms min); guarantees sufficient processor initialization time after power recovery. |
| Supply Current | 6µA typical at 3.3V/25°C; enables multi-year battery life in always-on supervisory circuits. |
| VCC Operating Range | 1.2V to 5.5V (-40°C to +105°C); supports valid reset signaling even during severe undervoltage conditions. |
| Output Type | Push-pull active-low; eliminates need for external pull-up resistor and ensures defined logic state without external components. |
| Transient Immunity | Rejects 100mV VCC undershoots lasting ≤20µs; prevents false resets from switching noise or load transients. |
Pinout & Package
The AZ809ANSTR-E1 is housed in a standard SOT-23-3 package (2.30 × 2.50 × 1.20 mm), optimized for high-density PCB layouts and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and timer; must be connected directly to system ground plane for noise immunity. |
| 2 | RESET | Active-low push-pull output; sinks ≥1.2mA at VCC=2.93V and drives microprocessor /RESET input directly. |
| 3 | VCC | Power supply input; accepts 1.2–5.5V; internal circuitry remains functional down to 1.0V for fail-safe reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | ±40mV tolerance over full temperature range ensures consistent reset point across 3.3V system voltage drift. |
| 240ms reset timeout | Guaranteed minimum 140ms pulse width ensures reliable CPU/MCU boot sequence completion before release. |
| Valid reset down to VCC = 1.0V | Enables deterministic reset assertion during deep brownout, preventing undefined processor states. |
| Push-pull output | Eliminates external pull-up resistor, reduces BOM count, and avoids floating output during power ramp-down. |
| Fast transient rejection | Immune to ≤20µs, 100mV VCC undershoots - critical for noisy DC-DC converter outputs and motor-driven systems. |
Applications
| Microprocessor Power-Up Sequencing | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Ensuring clean boot of ARM Cortex-M4 MCU after Li-ion battery voltage recovers from discharge-induced brownout. IC Role / Device Role / Timing Role: Precision voltage monitor asserting active-low RESET until VCC exceeds 2.93V and holds for 240ms. Use Value: Prevents firmware crash by guaranteeing minimum reset hold time independent of battery charge rate or ambient temperature. | Use Scenario: Supervising ultra-low-power BLE SoC (e.g., nRF52832) powered by coin cell during cold-start and intermittent wake cycles. IC Role / Device Role / Timing Role: Low-current (6µA) reset generator maintaining valid output down to VCC = 1.0V during deep discharge. Use Value: Extends usable battery life by eliminating unnecessary reset pulses while ensuring deterministic restart at end-of-life voltage. |
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
Use Scenario: Monitoring 3.3V rail derived from automotive 12V supply in door module exposed to load dump and cranking transients. IC Role / Device Role / Timing Role: Transient-immune supervisor rejecting ≤20µs glitches up to 100mV undershoot on VCC line. Use Value: Avoids spurious resets during engine start, improving system reliability without requiring oversized input capacitance. | Use Scenario: Reset coordination for FPGA-based I/O controller operating in factory-floor environment with 24V DC-DC ripple and EMI. IC Role / Device Role / Timing Role: Temperature-stable (±40mV over -40°C to +105°C) reset source with guaranteed 140ms minimum pulse width. Use Value: Ensures FPGA configuration completes before peripheral initialization, eliminating timing-related lockups in harsh thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 2.93V threshold, 240ms timeout, but 10µA typical ICC at 3.3V; SOT-23-3, RoHS-compliant. | Higher quiescent current reduces battery lifetime in always-on sensors; identical timing and accuracy. | Select when MAX brand qualification is required and 4µA extra supply current is acceptable. |
| TPS3808G33DBVR | 2.93V threshold, adjustable timeout (via capacitor), 1.6µA typical ICC; SOT-23-6, requires external capacitor. | Lower current but adds BOM complexity and board space; timeout not fixed - requires layout validation. | Select when ultra-low power dominates and programmable reset duration justifies added design effort. |
Compared with MAX809TRD3-T and TPS3808G33DBVR, the AZ809ANSTR-E1 delivers optimal balance of ultra-low ICC (6µA), fixed robust timing (240ms), zero external components, and full-temperature threshold stability - making it ideal for cost-sensitive, space-constrained, and battery-critical designs where simplicity and predictability are prioritized.
Availability
AZ809ANSTR-E1 is available at Aetrix Electronics and suitable for microprocessor power-up sequencing, battery-powered IoT sensors, automotive body control modules, and industrial PLC I/O subsystems requiring stable component supply and long-term lifecycle support.
Supply support for AZ809ANSTR-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 and mixed-signal IC designer specializing in high-reliability power management, protection, and supervision solutions for industrial, automotive, and consumer markets.
The AZ809A series targets cost-effective, low-power system supervision - delivering precision reset functionality in minimal footprint for resource-constrained embedded applications without compromising temperature stability or transient immunity.
FAQ
What is the exact reset threshold voltage for AZ809ANSTR-E1?
The AZ809ANSTR-E1 has a nominal reset threshold of 2.93V, with guaranteed range of 2.78V to 3.08V across -40°C to +105°C ambient temperature. This value is factory-trimmed and specified in the Electrical Characteristics table (page 5 of datasheet), confirming its suitability for 3.3V system supervision with margin against rail tolerance.
Does AZ809ANSTR-E1 require an external pull-up resistor on the RESET pin?
No. The AZ809ANSTR-E1 features a push-pull output stage that actively drives both HIGH and LOW states, eliminating the need for an external pull-up resistor. The RESET pin sources current when deasserted and sinks ≥1.2mA when asserted, ensuring direct interface with CMOS microprocessor /RESET inputs without additional components.
Can AZ809ANSTR-E1 operate reliably below 1.2V VCC?
Yes - the device guarantees valid RESET output down to VCC = 1.0V (per Recommended Operating Conditions, page 5). Below 1.0V, the output becomes high-impedance; however, for operation between 1.0V and 1.2V, the datasheet confirms functional reset assertion and timing integrity, enabling use in deep brownout detection scenarios.
How does AZ809ANSTR-E1 handle fast voltage transients on the VCC line?
The AZ809ANSTR-E1 rejects fast negative-going VCC transients via internal filtering and comparator hysteresis. As shown in Figure 9 of the datasheet, it ignores 100mV undershoots lasting ≤20µs - a specification validated across temperature and process corners - making it robust against switching regulator noise and load-dump-induced dips without requiring additional RC filtering.
AZ809ANSTR-E1 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-E1 FAQ
1.How can I place an order for AZ809ANSTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ809ANSTR-E1 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-E1 reliable?
The price and inventory of AZ809ANSTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ809ANSTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ809ANSTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ809ANSTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ809ANSTR-E1?
AZ809ANSTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ809ANSTR-E1 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-E1?
For technical support, including AZ809ANSTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ809ANSTR-E1 requirements.
6.How does Aetrix verify that AZ809ANSTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ809ANSTR-E1 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-E1 meets industry standards.
7.What is the process for return or replacement of AZ809ANSTR-E1?
All AZ809ANSTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ809ANSTR-E1, 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-E1 part is unused and in its original packaging.
Return procedure for AZ809ANSTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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