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Analog Devices Inc. ADM812RART-REEL
- Part No.:
- ADM812RART-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812RART-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,134
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Product details
Overview
ADM812RART-REEL from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-high reset output with 2.63 V reset threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and manual reset input-designed for reliable voltage monitoring in 2.5 V systems such as embedded controllers and safety-critical instrumentation.
For engineers reviewing the ADM812RART-REEL datasheet, ADM812RART-REEL pinout, ADM812RART-REEL application, or ADM812RART-REEL equivalent, this page delivers verified functional role, precise reset timing behavior, temperature-stable threshold performance, and real-world interfacing guidance for industrial and automotive microprocessor reset management.
Technical Context
The ADM812RART-REEL implements a precision bandgap-based voltage reference to monitor VCC and assert an active-high RESET signal when supply drops below 2.55 V to 2.70 V (−40°C to +85°C), with 30 ppm/°C temperature coefficient. It features debounced manual reset (MR) input with 10 µs minimum pulse width and 100 ns glitch immunity.
Its internal timer guarantees ≥140 ms RESET assertion after VCC rises above threshold, and RESET remains valid down to VCC = 1 V during power-down. The output drives high to 0.8 × VCC (ISOURCE = 150 µA) and low to ≤0.3 V (ISINK = 1.2 mA), enabling direct interface with 2.5 V/3.3 V logic without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typical at 25°C); holds system in reset until 2.5 V rail stabilizes within ±5% tolerance. |
| Reset Timeout | 140–560 ms; ensures microprocessor remains held after power-up until clocks and peripherals stabilize. |
| Supply Current | 5 µA (typical); enables use in battery-backed or ultra-low-power systems without measurable drain. |
| Operating Temp | −40°C to +85°C; qualified for industrial and automotive under-hood environments. |
| Reset Output Type | Active-high (RESET); directly compatible with processors requiring high-valid reset assertion. |
| Manual Reset Input | Debounced MR pin accepts >10 µs pulses; rejects noise spikes <100 ns-eliminates false resets in noisy ECU layouts. |
| VCC Range | 1.0 V to 5.5 V; supports brownout detection down to 1 V and operation across 2.5 V/3.3 V/5 V domains. |
Pinout & Package
ADM812RART-REEL uses the JEDEC-compliant 4-lead SOT-143 (RA-4) surface-mount package, 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | 0 V return path for all internal circuits; must be low-impedance connection to system ground plane. |
| 2 RESET | Active-high reset output | Drives high (≥0.8×VCC) during normal operation; pulls low (<0.3 V) only during reset condition. |
| 3 MR | Manual reset input | Active-low debounced input; requires >10 µs low pulse to trigger reset; floats high when unused. |
| 4 VCC | Monitored supply input | Accepts 1.0–5.5 V; powers device and serves as reference for 2.63 V threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | ±2.5% over −40°C to +85°C ensures deterministic reset point for 2.5 V systems without calibration. |
| 140 ms min. reset timeout | Guarantees sufficient hold time for 2.5 V FPGA configuration, flash boot, or PLL lock sequences. |
| 5 µA supply current | Enables permanent installation in always-on subsystems (e.g., CAN wake-up monitors) without battery depletion. |
| Debounced MR input | Eliminates need for external RC filter or Schmitt trigger-reduces BOM count and PCB area in space-constrained modules. |
| Valid RESET down to VCC = 1 V | Maintains clean logic state during deep brownout, preventing metastability or partial execution in microcontrollers. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Microcontroller in programmable logic controller experiences intermittent 2.5 V rail sag due to relay switching transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to halt firmware execution until 2.5 V rail recovers and stabilizes for ≥140 ms. Use Value: Prevents corrupted I/O register writes and inconsistent state machine transitions during voltage dips. |
Use Scenario: BCM microcontroller powers up from vehicle battery with slow-rising 2.5 V LDO output after ignition key turn. IC Role / Device Role / Timing Role: Monitors 2.5 V domain and holds RESET high until rail exceeds 2.55 V and sustains for minimum timeout. Use Value: Ensures CAN transceiver initialization completes before bus arbitration begins, avoiding error frames. |
| Medical Patient Monitor | Smart Energy Meter |
|
Use Scenario: Battery-backed 2.5 V ADC subsystem must maintain data integrity during AC power loss and switchover. IC Role / Device Role / Timing Role: Detects 2.5 V rail collapse and asserts RESET to freeze memory writes and disable analog front-end clocks. Use Value: Guarantees last valid sensor reading is preserved in nonvolatile memory before shutdown. |
Use Scenario: Meter MCU operates from isolated 2.5 V supply derived from mains; subject to lightning-induced sags. IC Role / Device Role / Timing Role: Provides glitch-immune reset assertion on 2.5 V brownout, with manual reset for field technician recovery. Use Value: Eliminates need for external watchdog IC-reduces cost and improves reliability in Class I metering designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812RTR | 2.63 V threshold, same SOT-143 package, but 20 µA max supply current vs. ADM812RART-REEL's 10 µA max. | Lacks guaranteed 1 V reset validity; RESET invalid below ~1.5 V-unsuitable for deep brownout hold. | Select MAX812RTR only if legacy design compatibility outweighs ultra-low-power and deep-brownout requirements. |
| TPS3808G12DBVR | 2.63 V threshold, SOT-23-5 package, adjustable delay (via capacitor), but no manual reset input. | Requires external capacitor for timing; lacks MR pin-adds complexity for field-serviceable reset capability. | Choose TPS3808G12DBVR when programmable timeout is needed and manual reset is handled elsewhere in system. |
Compared with MAX812RTR and TPS3808G12DBVR, ADM812RART-REEL uniquely combines 5 µA typical current, guaranteed reset validity down to 1 V, integrated debounced MR, and fixed 140 ms timeout-all in a 4-pin SOT-143 footprint-making it optimal for compact, battery-sensitive, and safety-critical 2.5 V supervisory roles.
Availability
ADM812RART-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, smart energy meters, and safety-critical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM812RART-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 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 robust, low-power microprocessor supervision in harsh industrial and automotive environments where supply voltage integrity is mission-critical.
FAQ
What is the exact reset threshold voltage of ADM812RART-REEL and how does it vary with temperature?
The ADM812RART-REEL has a nominal reset threshold of 2.63 V at 25°C, specified from 2.55 V to 2.70 V over the full −40°C to +85°C operating range. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is tightly bounded-ensuring predictable reset behavior across thermal extremes without calibration.
Does ADM812RART-REEL support manual reset, and what are the electrical requirements for the MR pin?
Yes, ADM812RART-REEL includes a debounced manual reset (MR) input. It requires a low-going pulse ≥10 µs wide to trigger reset and rejects glitches <100 ns. The MR pin recognizes logic low when pulled below 0.25 × VCC and logic high when driven above 0.7 × VCC-enabling direct interface with 2.5 V GPIO without level shifters.
Can ADM812RART-REEL operate reliably during deep supply brownouts?
Yes. ADM812RART-REEL maintains valid RESET output down to VCC = 1 V, ensuring the microprocessor remains held in a known state even during severe brownouts. Below 1 V, RESET becomes high-impedance-so a 100 kΩ pull-down resistor is recommended to prevent floating logic states.
What is the power-on reset timeout duration of ADM812RART-REEL, and is it adjustable?
The ADM812RART-REEL provides a fixed minimum power-on reset timeout of 140 ms, extending up to 560 ms depending on VCC and temperature. This timeout is internally generated and not user-adjustable-ensuring consistent, repeatable reset timing without external components or configuration overhead.
Is ADM812RART-REEL RoHS compliant and what packaging format is supplied?
Yes, ADM812RART-REEL is RoHS compliant (lead-free, halogen-free) and supplied in tape-and-reel format per ordering code: 3,000 units per 7-inch reel (REEL7). The device branding is "M6F" on the top surface, and it uses the RA-4 (SOT-143) package per JEDEC TO-253-AA standards.
ADM812RART-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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
ADM812RART-REEL FAQ
1.How can I place an order for ADM812RART-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812RART-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 ADM812RART-REEL reliable?
The price and inventory of ADM812RART-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812RART-REEL is usually 5 days.
3.What payment methods are accepted for ADM812RART-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812RART-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812RART-REEL?
ADM812RART-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812RART-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 ADM812RART-REEL?
For technical support, including ADM812RART-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812RART-REEL requirements.
6.How does Aetrix verify that ADM812RART-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812RART-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 ADM812RART-REEL meets industry standards.
7.What is the process for return or replacement of ADM812RART-REEL?
All ADM812RART-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812RART-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 ADM812RART-REEL part is unused and in its original packaging.
Return procedure for ADM812RART-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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