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Analog Devices Inc. ADM811SART-REEL7
- Part No.:
- ADM811SART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM811SART-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
ADM811SART-REEL7 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 with ±5% threshold accuracy over −40°C to +85°C, 140 ms minimum power-on reset timeout, and 5 µA typical supply current. It serves as a voltage monitor and system reset controller in embedded microprocessor systems requiring reliable brownout detection and manual reset capability.
For engineers reviewing the ADM811SART-REEL7 datasheet, ADM811SART-REEL7 pinout, ADM811SART-REEL7 application, or ADM811SART-REEL7 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for industrial and automotive supervisory circuit design.
Technical Context
The ADM811SART-REEL7 implements a precision bandgap reference-based voltage comparator with internal debounced manual reset input (MR), guaranteeing acceptance of pulses >10 µs and rejection of glitches <100 ns. Its reset generator holds RESET low for ≥140 ms after VCC rises above 2.93 V (typical), ensuring stable microprocessor initialization.
It features guaranteed reset assertion down to VCC = 1.0 V at −40°C to +85°C, logic-level compatible output sinking 1.2 mA at 0.3 V, and temperature coefficient of 30 ppm/°C on the reset threshold - enabling robust operation across supply and thermal variations without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V (typical), ±5% over −40°C to +85°C - ensures accurate 3.3 V rail supervision with margin for degradation. |
| Supply Current | 5 µA (typical) at VCC < 3.6 V - enables ultra-low-power operation in battery-backed or energy-sensitive systems. |
| Reset Timeout | 140 ms minimum after VCC rise - provides sufficient stabilization time for microcontrollers and peripherals. |
| Operating Range | VCC = 1.2 V to 5.5 V - supports valid reset assertion during deep brownout and compatibility with 2.5–5 V logic domains. |
| Manual Reset Pulse | ≥10 µs width required - rejects switch bounce and EMI-induced transients while enabling tactile or logic-driven reset. |
| Output Drive | Sinks 1.2 mA at 0.3 V (VCC = VTH(MIN)) - directly interfaces with standard CMOS/TTL inputs without pull-up resistor. |
| Temperature Coefficient | 30 ppm/°C - limits threshold drift to ≤15 mV over full temperature range, critical for high-reliability applications. |
Pinout & Package
ADM811SART-REEL7 uses a 4-lead SOT-143 (JEDEC TO-253-AA, package option RA-4) with 1.3 mm × 1.9 mm footprint and 0.95 mm height. Pin 1 is GND, Pin 2 is active-low RESET, Pin 3 is MR (manual reset, active low), Pin 4 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | 0 V return path for all internal circuits and reset output; must be low-impedance connection to system ground plane. |
| 2 (RESET) | Active-low reset output | Open-drain logic output held low during reset condition (VCC < 2.93 V or MR low); requires no external pull-up for most CMOS loads. |
| 3 (MR) | Debounced manual reset input | Active-low input accepting ≥10 µs pulses; internally filtered to reject noise <100 ns - eliminates need for external RC debounce. |
| 4 (VCC) | Monitored supply input | Input for 2.93 V nominal supply; accepts 1.2–5.5 V range; decoupling with 0.1 µF capacitor to GND recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V threshold | Enables accurate supervision of 3.3 V rails with 5% tolerance margin, matching common LDO output tolerances. |
| 140 ms power-on reset timer | Guarantees microcontroller reset hold time exceeds typical crystal startup and PLL lock durations. |
| 1.2 mA sink capability at 0.3 V | Drives standard logic inputs directly without external pull-up, reducing BOM count and layout complexity. |
| Reset assertion down to VCC = 1.0 V | Maintains valid low-state reset signal during deep supply collapse, preventing spurious processor wake-up. |
| 10 µs minimum MR pulse width | Supports mechanical pushbutton reset with minimal contact bounce filtering, eliminating external Schmitt triggers. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in factory environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Supervises 3.3 V I/O and communication rail; asserts RESET until stable, then holds for 140 ms to synchronize firmware boot. Use Value: Prevents corrupted register states during brownout by maintaining reset until supply settles within 2.93 V ±5%, verified across −40°C to +85°C. |
Use Scenario: Reset management for microcontrollers in door module ECUs exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Monitors 3.3 V domain derived from buck converter; activates RESET on voltage sag below 2.93 V and sustains it post-recovery. Use Value: Ensures deterministic MCU restart after battery voltage dip to 1.2 V, with guaranteed reset validity down to VCC = 1.0 V. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Critical power integrity monitoring in portable diagnostic devices where unexpected reset could interrupt life-support functions. IC Role / Device Role / Timing Role: Provides fail-safe reset for ARM Cortex-M host; debounced MR allows clinician-initiated reboot without hardware redesign. Use Value: 10 µs MR pulse requirement enables direct connection to tactile switch; 30 ppm/°C threshold stability avoids false resets during ambient temperature shifts. |
Use Scenario: Long-term reliability in utility-grade meters deployed outdoors with 15+ year field life and seasonal thermal cycling. IC Role / Device Role / Timing Role: Supervises isolated 3.3 V supply feeding metrology ADC and RF transceiver; integrates with watchdog timer via MR pin. Use Value: 5 µA typical quiescent current extends battery backup runtime; RoHS-compliant SOT-143 package supports lead-free reflow and long-term solder joint integrity. |
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 20 µA max supply current vs. 15 µA for ADM811SART-REEL7; no guaranteed 1.0 V reset assertion. | Lacks guaranteed reset validity below 1.2 V - unsuitable for deep brownout recovery scenarios requiring sub-1.2 V hold. | Select MAX811SUT+T only if board space permits SOT-23-4 and deep-brownout behavior is not required. |
| TPS3808G18DBVR | 2.93 V threshold, 1.8 µA typical IQ, but 5-pin SOT-23 package; includes watchdog timer not present in ADM811SART-REEL7. | Requires PCB redesign due to extra pin (WDI) and different pinout; adds watchdog functionality unnecessary in pure reset-only designs. | Choose TPS3808G18DBVR only when watchdog capability is needed and layout revision is acceptable. |
Compared with MAX811SUT+T and TPS3808G18DBVR, the ADM811SART-REEL7 uniquely combines guaranteed 1.0 V reset assertion, 5 µA ultra-low IQ, and 4-pin SOT-143 compatibility - making it optimal for space-constrained, battery-sensitive, and deep-brownout-prone applications where minimal feature set and maximum reliability are prioritized.
Availability
ADM811SART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, smart energy meters, and portable instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for ADM811SART-REEL7 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 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 applications demanding accurate voltage monitoring, low power consumption, and robust manual reset functionality in harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage for ADM811SART-REEL7 and its tolerance?
The ADM811SART-REEL7 has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V over the full −40°C to +85°C operating temperature range. This ±5% tolerance is specified per Analog Devices Rev. H datasheet Table 1 and ensures reliable supervision of 3.3 V supply rails under worst-case conditions.
Does ADM811SART-REEL7 support operation down to 1.0 V VCC, and what does that mean for system design?
Yes, ADM811SART-REEL7 guarantees RESET remains valid (low) down to VCC = 1.0 V at −40°C to +85°C. This means the microprocessor stays held in reset during deep brownout events, preventing undefined states or partial execution - a critical feature for safety-critical and automotive applications where uncontrolled power-down must be avoided.
What is the minimum pulse width required on the MR pin of ADM811SART-REEL7 to trigger a manual reset?
The MR pin of ADM811SART-REEL7 requires a minimum pulse width of 10 µs to reliably initiate a manual reset. Pulses shorter than 100 ns are rejected by internal debouncing circuitry, making the ADM811SART-REEL7 immune to switch bounce and EMI-induced glitches without external filtering components.
What package type and dimensions does ADM811SART-REEL7 use, and is it RoHS compliant?
ADM811SART-REEL7 uses the 4-lead SOT-143 package (JEDEC TO-253-AA, Analog Devices package option RA-4), measuring 1.30 mm × 1.92 mm × 0.95 mm. The "-REEL7" suffix indicates tape-and-reel packaging; RoHS compliance is confirmed by the "Z" variant (e.g., ADM811SARTZ-REEL7), but the base ADM811SART-REEL7 is also RoHS compliant per Analog Devices ordering guide footnote 2.
How does the reset timeout behavior of ADM811SART-REEL7 differ between power-up and power-down events?
On power-up, ADM811SART-REEL7 holds RESET low for a minimum of 140 ms after VCC rises above 2.93 V. During power-down, RESET remains low until VCC falls below the threshold and continues asserting for the duration of the drop - with no fixed timeout. This asymmetry ensures safe boot sequencing while guaranteeing shutdown integrity without timing ambiguity.
ADM811SART-REEL7 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-REEL7 FAQ
1.How can I place an order for ADM811SART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM811SART-REEL7 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-REEL7 reliable?
The price and inventory of ADM811SART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM811SART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM811SART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM811SART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM811SART-REEL7?
ADM811SART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM811SART-REEL7 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-REEL7?
For technical support, including ADM811SART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM811SART-REEL7 requirements.
6.How does Aetrix verify that ADM811SART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM811SART-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM811SART-REEL7?
All ADM811SART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM811SART-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for ADM811SART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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