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Analog Devices Inc. ADM811SART-REEL
- Part No.:
- ADM811SART-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM811SART-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,519
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Product details
Overview
ADM811SART-REEL from Analog Devices is a precision microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-low reset assertion for 2.93 V supply monitoring, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and debounced manual reset input. It ensures reliable system initialization and brownout recovery in embedded controllers and safety-critical instrumentation.
For engineers reviewing the ADM811SART-REEL datasheet, ADM811SART-REEL pinout, ADM811SART-REEL application, or ADM811SART-REEL equivalent, this page delivers verified functional identity, temperature-stable reset threshold (2.85–3.00 V over −40°C to +85°C), glitch-immune MR interface, VCC-valid RESET output down to 1 V, and direct compatibility with 2.5 V/3 V/3.3 V logic systems.
Technical Context
The ADM811SART-REEL implements a bandgap-based voltage reference with 30 ppm/°C temperature coefficient and internal timing capacitor to generate a guaranteed minimum 140 ms reset pulse after VCC exceeds the 2.93 V threshold. Its reset generator remains functional even as VCC falls to 1 V, ensuring deterministic microprocessor hold during power decay.
It features a fully debounced manual reset input with 10 µs minimum pulse width acceptance and 100 ns glitch immunity, plus logic-level RESET output compatible with both CMOS and TTL interfaces. The device operates across −40°C to +85°C without external components beyond a recommended 0.1 µF VCC-to-GND decoupling capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V nominal (2.85–3.00 V over −40°C to +85°C); enables precise supervision of 3 V rail with 5% margin before reset activation. |
| Supply Current | 5 µA typical at VCC < 3.6 V; supports ultra-low-power battery-backed or energy-harvesting systems. |
| Power-On Reset Timeout | 140–560 ms; guarantees sufficient stabilization time for microcontrollers and peripheral ICs after power-up. |
| Manual Reset Pulse Width | ≥10 µs minimum; rejects switch bounce and EMI-induced transients while enabling robust user-initiated reset. |
| RESET Output Type | Active-low open-drain; sinks 1.2 mA at 0.3 V, compatible with pull-up to any VCC ≤ 5.5 V or separate I/O rail. |
| Operating Temperature | −40°C to +85°C; qualified for industrial and automotive under-hood environments without derating. |
| VCC Range | 1.0 V to 5.5 V; maintains valid RESET assertion down to 1 V, preventing spurious release during brownout. |
Pinout & Package
ADM811SART-REEL uses the JEDEC-compliant 4-lead SOT-143 (RA-4) package, measuring 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and 0.95 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for all internal circuits; must be connected directly to system ground plane for noise immunity. |
| 2 RESET | Active-low reset output | Open-drain output asserted low during VCC undervoltage or MR activation; requires external pull-up resistor. |
| 3 MR | Debounced manual reset input | Active-low input; ignores pulses <100 ns, accepts pulses ≥10 µs; floats high when unused. |
| 4 VCC | Monitored supply input | Primary power input and voltage sense node; requires 0.1 µF ceramic decoupling capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitor | 2.93 V threshold with ±150 mV total variation over full temperature range ensures consistent 3 V rail supervision. |
| Ultra-low quiescent current | 5 µA typical enables >10-year battery life in always-on supervisory applications such as smart sensors. |
| Guaranteed minimum reset timeout | 140 ms power-on delay meets ARM Cortex-M and PIC microcontroller startup timing requirements. |
| Brownout-safe RESET output | Valid low-state operation down to VCC = 1 V prevents premature processor release during supply collapse. |
| Integrated MR debounce | Hardware filtering eliminates need for external RC network or firmware debouncing logic. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controller mainboard with 3 V FPGA configuration and 2.5 V I/O banks. IC Role / Device Role / Timing Role: Supervises 3 V supply rail and asserts synchronous reset to FPGA and microcontroller upon undervoltage or manual service request. Use Value: Prevents configuration corruption during brownout by holding FPGA in reset until stable 3 V is confirmed, leveraging 2.93 V threshold and 140 ms timeout. |
Use Scenario: Reset coordination in body control unit managing door locks, lighting, and CAN gateway with dual 3 V/5 V domains. IC Role / Device Role / Timing Role: Monitors primary 3 V domain and triggers hardware reset to MCU and peripheral drivers during battery dip or ignition cycle transition. Use Value: Ensures deterministic state recovery after cold crank (VCC drop to ~2.8 V) using guaranteed 2.85 V lower limit and 100 ns glitch immunity on MR line. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Safety-critical power validation in portable ECG front-end with isolated 3 V analog and digital supplies. IC Role / Device Role / Timing Role: Provides fail-safe reset signal to ARM Cortex-M4 processor and ADC interface when 3 V rail deviates beyond ±3.5%. Use Value: Meets IEC 60601-1 requirement for automatic system halt during power anomaly via 30 ppm/°C stable reference and −40°C to +85°C qualification. |
Use Scenario: Tamper-resistant boot integrity in utility meter with backup supercapacitor and real-time clock. IC Role / Device Role / Timing Role: Detects main supply failure and initiates controlled shutdown sequence while asserting reset to secure MCU before VCC drops below 2.9 V. Use Value: Enables clean RTC save and flash write completion using 1 V minimum RESET validity and 5 µA quiescent current during backup mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811SUT+T | 2.93 V threshold, same SOT-23-4 package, but higher 10 µA typical supply current and no guaranteed 1 V RESET validity. | Lacks brownout-safe RESET hold below 2 V; unsuitable for systems requiring deterministic release at deep brownout. | Select only if board space permits SOT-23-4 and application does not require sub-2 V reset assertion. |
| TPS3808G30DBVR | 3.0 V threshold, 1.6 µA typical current, adjustable delay, but requires external capacitor for timeout and lacks integrated MR debounce. | Needs additional passive components and firmware handling for manual reset; increases BOM count and layout complexity. | Prefer when programmable timeout or ultra-low current dominates design priorities over component count and simplicity. |
Compared with MAX811SUT+T and TPS3808G30DBVR, ADM811SART-REEL delivers superior brownout resilience (RESET valid to 1 V), zero-component integration (no external cap or RC), and guaranteed MR debounce-making it optimal for space-constrained, safety-critical, or battery-sensitive 3 V systems where reliability trumps configurability.
Availability
ADM811SART-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, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM811SART-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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM811/ADM812 family was designed specifically for microprocessor supervisory functions in harsh industrial and automotive environments, emphasizing accuracy, low power, and robustness over wide temperature ranges.
FAQ
What is the exact reset threshold voltage of ADM811SART-REEL and its tolerance over temperature?
The ADM811SART-REEL has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V across the full operating temperature range of −40°C to +85°C. This 150 mV total variation ensures reliable supervision of 3 V rails while accommodating standard PSU tolerances and thermal drift, as confirmed in Table 1 and Table 4 of the Rev. H datasheet.
Does ADM811SART-REEL support manual reset functionality, and what are its electrical requirements?
Yes, ADM811SART-REEL includes a dedicated MR pin (Pin 3) that accepts active-low manual reset signals. It guarantees acceptance of pulses ≥10 µs and rejects glitches ≤100 ns. The input threshold is 0.7 × VCC for recognition of a rising edge and 0.25 × VCC for a falling edge, enabling robust interfacing with switches or digital outputs without external conditioning circuitry.
What is the minimum VCC level at which ADM811SART-REEL maintains a valid RESET output?
ADM811SART-REEL maintains a valid low-state RESET output down to VCC = 1.0 V, as specified in the Absolute Maximum Ratings and General Description sections. This ensures the microprocessor remains held in reset during deep brownout conditions, preventing erratic behavior or data corruption as the supply collapses - a key differentiator versus alternatives that lose output validity above 2 V.
What package type and footprint does ADM811SART-REEL use, and are there land pattern recommendations?
ADM811SART-REEL uses the 4-lead SOT-143 (JEDEC TO-253-AA, package option RA-4) with dimensions 2.90 mm × 1.40 mm × 1.07 mm and 0.95 mm lead pitch. Analog Devices recommends following the outline drawing in Figure 12 (Rev. H datasheet), including 0.54 mm pad length and 0.20 mm solder mask clearance, to ensure reliable reflow and mechanical stability.
How does ADM811SART-REEL differ from the ADM811TART-REEL variant?
ADM811SART-REEL has a 2.93 V reset threshold optimized for 3 V systems, while ADM811TART-REEL is rated at 3.08 V for tighter 3.3 V rail supervision. Both share identical SOT-143 packaging, −40°C to +85°C operation, and functional architecture, but their threshold values target distinct supply voltage classes - selecting ADM811SART-REEL avoids premature reset in nominally 3 V designs where 3.08 V would trigger unnecessarily.
ADM811SART-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
ADM811SART-REEL FAQ
1.How can I place an order for ADM811SART-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM811SART-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 ADM811SART-REEL reliable?
The price and inventory of ADM811SART-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM811SART-REEL is usually 5 days.
3.What payment methods are accepted for ADM811SART-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM811SART-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM811SART-REEL?
ADM811SART-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM811SART-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 ADM811SART-REEL?
For technical support, including ADM811SART-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM811SART-REEL requirements.
6.How does Aetrix verify that ADM811SART-REEL is sourced from the original manufacturer or authorized distributors?
All ADM811SART-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 ADM811SART-REEL meets industry standards.
7.What is the process for return or replacement of ADM811SART-REEL?
All ADM811SART-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM811SART-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 ADM811SART-REEL part is unused and in its original packaging.
Return procedure for ADM811SART-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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