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Analog Devices Inc. ADM809RART-REEL
- Part No.:
- ADM809RART-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ADM809RART-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
ADM809RART-REEL from Analog Devices is a microprocessor supervisory circuit with push-pull active-low RESET output, 2.63 V reset threshold (±0.04 V over −40°C to +125°C), 140–460 ms power-on reset timeout, and 17 μA supply current at VCC < 3.6 V. It monitors 2.5 V/3 V supply rails in embedded controllers and ensures reliable reset assertion down to 1 V VCC.
For engineers reviewing the ADM809RART-REEL datasheet, ADM809RART-REEL pinout, ADM809RART-REEL application, or ADM809RART-REEL equivalent, key selection criteria include reset threshold accuracy (±2.3% over temperature), SOT-23-3 package compatibility, push-pull drive capability (3.2 mA sink at VTH min), and guaranteed operation across industrial and automotive temperature ranges.
Technical Context
The ADM809RART-REEL integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reference circuit maintains stable threshold detection even during fast VCC transients up to 100 V/μs.
It operates across 1.2 V to 5.5 V VCC with reset assertion active below 2.63 V and deassertion delayed ≥140 ms after VCC exceeds threshold. The push-pull output eliminates need for external pull-up resistors and supports direct interface to CMOS/TTL logic inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (±0.04 V over −40°C to +125°C); enables precise monitoring of 2.5 V supply rails with margin for ripple and tolerance. |
| Reset Timeout | 140–460 ms (−40°C to +85°C); ensures microprocessor remains held in reset until power stabilizes post-power-up. |
| Supply Current | 17 μA (typical, VCC < 3.6 V); supports battery-powered and low-power portable instrumentation. |
| VCC Operating Range | 1.2 V to 5.5 V (−40°C to +125°C); allows use with 1.8 V, 2.5 V, 3.3 V, and 5 V systems without level-shifting. |
| RESET Output Type | Push-pull active-low; delivers 3.2 mA sink current at VTH min, eliminating external pull-up and reducing BOM count. |
| Reset Assertion Voltage | Operates down to 1.0 V VCC; guarantees valid reset signal during brownout and deep undervoltage conditions. |
| Temperature Range | −40°C to +125°C; qualified for under-hood automotive, industrial control, and harsh-environment applications. |
Pinout & Package
ADM809RART-REEL uses a 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB, with 1.30 mm × 2.90 mm footprint and 0.95 mm height. Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for internal comparator and output stage; must be connected directly to system ground plane. |
| RESET (Pin 2) | Active-low push-pull output | Drives low during reset condition (VCC < 2.63 V) and high otherwise; sinks 3.2 mA minimum at VTH min, sources 500 μA at VCC > VTH max. |
| VCC (Pin 3) | Supply input | Monitored voltage rail; powers internal circuitry and defines logic-high level for RESET output; functional down to 1.0 V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63 V ±0.04 V over full temperature range ensures consistent trip point across operating environments. |
| Glitch-immune comparator | Rejects transients ≤100 mV amplitude and ≤400 μs duration, preventing spurious resets from supply noise. |
| Low quiescent current | 17 μA typical enables >10-year battery life in always-on sensor nodes and portable diagnostics tools. |
| Wide VCC range | 1.2 V to 5.5 V operation supports legacy 5 V, modern 3.3 V/2.5 V, and emerging 1.8 V microcontroller platforms. |
| Industrial temperature grade | −40°C to +125°C qualification meets AEC-Q100 stress test requirements for automotive body electronics. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors 2.5 V I/O supply in programmable logic controller CPU board during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to hold ARM Cortex-M7 core in reset until 2.5 V rail stabilizes above 2.63 V. Use Value: Prevents firmware corruption by guaranteeing ≥140 ms reset hold time even when VCC dips to 1.2 V during transient faults. |
Use Scenario: Ensures safe startup of LIN transceiver and door lock MCU after vehicle ignition sequence. IC Role / Device Role / Timing Role: Reset generator tied to 3.3 V domain, providing clean power-on initialization signal compliant with ISO 11898-3 timing constraints. Use Value: Push-pull output drives LIN bus enable pin directly without pull-up resistor, reducing component count and PCB area. |
| Medical Patient Monitor | Smart Energy Meter |
|
Use Scenario: Validates 2.5 V analog front-end supply before enabling ADC sampling in portable ECG unit. IC Role / Device Role / Timing Role: Precision voltage monitor triggering hardware reset if supply falls below 2.63 V due to battery sag or EMI coupling. Use Value: 30 ppm/°C tempco and ±2.3% threshold tolerance prevent false resets during thermal cycling in clinical environments. |
Use Scenario: Secures metering SoC boot sequence during grid voltage sags and capacitor discharge intervals. IC Role / Device Role / Timing Role: Brownout detector asserting RESET while VCC drops below 2.63 V during AC line interruption. Use Value: Operates down to 1.0 V VCC, ensuring reset remains asserted through full capacitor discharge phase (≥200 ms). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809RTR | 2.63 V threshold, SOT-23-3, but 20 μA supply current and 160 ms min reset timeout; no 125°C rating. | Limited to commercial/industrial −40°C to +85°C; not qualified for under-hood automotive use. | Select when cost sensitivity outweighs extended temperature requirement and 3 μA higher quiescent current is acceptable. |
| TPS3808G12DBVR | 1.2 V threshold option only; requires external resistor divider for 2.63 V; 1.6 μA supply current; 200 ms fixed timeout. | Programmable threshold adds design complexity; ultra-low current suits energy harvesting, not high-noise automotive. | Choose only if system requires sub-2 V monitoring or multi-rail supervision with shared enable logic. |
Compared with MAX809RTR and TPS3808G12DBVR, ADM809RART-REEL delivers tighter threshold accuracy over extended temperature, lower supply current, and guaranteed push-pull drive strength-making it optimal for space-constrained, high-reliability 2.5 V system supervision where layout simplicity and thermal robustness are critical.
Availability
ADM809RART-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM809RART-REEL 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM809 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for reliable power-on reset generation and brownout protection in safety-critical embedded systems operating across harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of ADM809RART-REEL and how does it vary with temperature?
The ADM809RART-REEL has a nominal reset threshold of 2.63 V, with a guaranteed range of 2.55 V to 2.70 V over −40°C to +85°C and 2.52 V to 2.74 V over −40°C to +125°C. This corresponds to ±2.3% tolerance at 25°C and ±2.9% at maximum temperature, supported by 30 ppm/°C temperature coefficient data from the datasheet.
Does ADM809RART-REEL require an external pull-up resistor on the RESET pin?
No. ADM809RART-REEL features a push-pull RESET output, unlike the open-drain ADM803. Its RESET pin actively drives high (to 0.8×VCC) and low (to 0.4 V at 3.2 mA sink), eliminating the need for external pull-up components and simplifying PCB layout.
Can ADM809RART-REEL operate reliably when VCC drops below 2.0 V?
Yes. ADM809RART-REEL remains fully functional down to 1.0 V VCC, maintaining valid RESET assertion and deassertion behavior. Its internal circuitry continues to monitor voltage and assert RESET low until VCC rises above 2.63 V, then holds RESET low for ≥140 ms.
What package type and dimensions does ADM809RART-REEL use?
ADM809RART-REEL uses the 3-lead SOT-23 (RT-3) package per JEDEC TO-236-AB standard: 2.90 mm × 1.30 mm footprint, 0.95 mm height, and 0.95 mm lead pitch. Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC, with top-side marking "9RXX".
How does the reset timeout of ADM809RART-REEL behave across temperature?
ADM809RART-REEL provides a minimum reset timeout of 140 ms at −40°C to +85°C and 100 ms at +85°C to +125°C, with typical value of 240 ms at 25°C. Maximum timeout is 460 ms at −40°C to +85°C and 840 ms at +85°C to +125°C, per Table 1 in the datasheet.
ADM809RART-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ADM809RART-REEL FAQ
1.How can I place an order for ADM809RART-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM809RART-REEL 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 ADM809RART-REEL reliable?
The price and inventory of ADM809RART-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM809RART-REEL is usually 5 days.
3.What payment methods are accepted for ADM809RART-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM809RART-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM809RART-REEL?
ADM809RART-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM809RART-REEL 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 ADM809RART-REEL?
For technical support, including ADM809RART-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM809RART-REEL requirements.
6.How does Aetrix verify that ADM809RART-REEL is sourced from the original manufacturer or authorized distributors?
All ADM809RART-REEL 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 ADM809RART-REEL meets industry standards.
7.What is the process for return or replacement of ADM809RART-REEL?
All ADM809RART-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM809RART-REEL, 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 ADM809RART-REEL part is unused and in its original packaging.
Return procedure for ADM809RART-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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