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Analog Devices Inc. ADM812SART-REEL
- Part No.:
- ADM812SART-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812SART-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,707
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Product details
Overview
ADM812SART-REEL from Analog Devices is a microprocessor supervisory circuit in SOT-143 package, providing active-high reset output with 2.93 V threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and manual reset input-designed for reliable power monitoring in embedded microcontroller systems operating at 3.3 V nominal supplies.
For engineers reviewing the ADM812SART-REEL datasheet, ADM812SART-REEL pinout, ADM812SART-REEL application, or ADM812SART-REEL equivalent, this page delivers verified functional role, precise reset threshold behavior across temperature, manual reset timing specs, glitch-immune MR interface, and real-world use cases in safety-critical and portable electronics.
Technical Context
The ADM812SART-REEL integrates a precision voltage reference, debounced manual reset input, and internal timer to generate a stable active-high RESET signal. It asserts reset when VCC falls below 2.93 V (±0.05 V over −40°C to +85°C), maintains reset for ≥140 ms after VCC recovery, and guarantees valid output down to VCC = 1 V.
Its MR input accepts pulses >10 µs while rejecting transients <100 ns; RESET output drives high to 0.8 × VCC (ISOURCE = 150 µA) and low to ≤0.3 V (ISINK = 1.2 mA), enabling direct interfacing with 3.3 V CMOS logic without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V (2.85–3.00 V over −40°C to +85°C); ensures reliable brownout detection for 3.3 V systems. |
| Reset Timeout | 140–560 ms; provides sufficient stabilization time for microprocessors after power-up or recovery. |
| Supply Current | 5 µA typical (VCC < 3.6 V); enables ultra-low-power operation in battery-backed or energy-sensitive designs. |
| MR Pulse Width | ≥10 µs required; supports robust manual reset in noisy environments with switch bounce suppression. |
| RESET Output Logic | Active-high; directly compatible with processors requiring high-valid reset assertion (e.g., ARM Cortex-M, PIC, MSP430). |
| Operating Temp | −40°C to +85°C; qualified for industrial and automotive under-hood applications. |
| Package | SOT-143 (RA-4); 4-pin surface-mount footprint with 1.4 mm × 2.9 mm body, suitable for space-constrained PCBs. |
Pinout & Package
SOT-143 (RA-4) 4-lead small outline transistor package with gull-wing leads, JEDEC-compliant outline, 1.4 mm × 2.9 mm body size, and 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | 0 V return path for all internal circuits; must be connected to system ground plane for stable reset threshold accuracy. |
| RESET (Pin 2) | Active-high reset output | Drives high (≥0.8×VCC) during reset condition; sinks ≤0.3 V when inactive; requires no external pull-up for CMOS loads. |
| VCC (Pin 3) | Monitored supply input | Accepts 1.0–5.5 V; powers internal circuitry and sets reset threshold reference; decoupling with 0.1 µF capacitor recommended. |
| MR (Pin 4) | Manual reset input | Active-low debounced input; ignores glitches <100 ns; asserts reset when pulled below 0.25×VCC or 0.8 V depending on VCC level. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93 V threshold | Guaranteed 2.85–3.00 V over full temperature range, eliminating need for external resistor networks or calibration. |
| Ultra-low 5 µA quiescent current | Extends battery life in portable instruments and enables always-on supervision without significant power penalty. |
| Debounced manual reset | Hardware-filtered MR input rejects mechanical switch bounce and EMI-induced noise, removing need for external RC filtering. |
| Valid RESET down to VCC = 1 V | Ensures microprocessor remains held in reset during full power collapse, preventing undefined state or spurious execution. |
| Glitch-immune power monitoring | Internal filtering prevents false resets from transient supply dips shorter than 40 µs (at 125 mV overdrive). |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and brownout protection in programmable logic controllers exposed to fluctuating 24 V DC rails converted to 3.3 V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM-based controller during undervoltage events. Use Value: Prevents firmware corruption by holding processor in reset until regulated 3.3 V rail stabilizes for ≥140 ms post-power-up. | Use Scenario: Reset management for microcontrollers in door module ECUs subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Voltage monitor detecting 3.3 V supply degradation below 2.93 V and triggering controlled shutdown via RESET signal. Use Value: Ensures deterministic reset behavior even as battery voltage drops to 1 V, avoiding erratic CAN communication or sensor misreads. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-powered vital sign recorder requiring fail-safe restart after low-battery cutoff and recharge. IC Role / Device Role / Timing Role: Active-high reset generator tied to 3.3 V LDO output, with manual reset button for field service recovery. Use Value: 10 µs MR pulse support enables compact tactile switch integration; 5 µA current extends runtime between charges. | Use Scenario: Tamper-resistant electricity meter with isolated MCU and real-time clock, operating from split-rail 3.3 V supply. IC Role / Device Role / Timing Role: Primary supervisor ensuring MCU reset occurs before RTC or metrology ASIC loses regulation. Use Value: 2.93 V threshold aligns precisely with 3.3 V LDO dropout margin, maximizing usable battery capacity before forced reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812SUT+T | 2.93 V threshold, SOT-23-4 package, 1.5 µA max supply current, no guaranteed MR debounce specification. | Lacks documented MR glitch immunity; requires external RC filter for noisy switch interfaces. | Choose when minimal quiescent current is critical and MR noise environment is controlled. |
| TPS3808G33DBVR | 3.3 V threshold (±0.5%), SOT-23-5, 16 µA typical supply current, adjustable reset delay via capacitor. | Higher threshold tolerance (±1.5%) and fixed 3.3 V point limit flexibility in 3.3 V ±5% systems. | Choose when programmable delay is needed and tighter VCC regulation allows higher threshold setting. |
Compared with MAX812SUT+T and TPS3808G33DBVR, the ADM812SART-REEL offers superior MR debounce (100 ns rejection), lower temperature drift (30 ppm/°C), and guaranteed reset validity down to 1 V VCC-making it preferred for safety-critical and wide-input-range applications where deterministic reset behavior is non-negotiable.
Availability
ADM812SART-REEL is available at Aetrix Electronics and suitable for industrial control, automotive electronics, portable instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM812SART-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers and manufacturing worldwide.
The ADM811/ADM812 family was developed specifically for microprocessor supervisory functions in space- and power-constrained systems, emphasizing precision threshold accuracy, ultra-low power, and robust noise immunity in harsh electrical environments.
FAQ
What is the exact reset threshold voltage of the ADM812SART-REEL and how does it vary with temperature?
The ADM812SART-REEL has a nominal reset threshold of 2.93 V at 25°C, with guaranteed range of 2.85 V to 3.00 V over the full −40°C to +85°C operating temperature range. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is tightly bounded and predictable-critical for maintaining reset integrity in thermally variable environments like automotive or industrial enclosures where the ADM812SART-REEL operates.
Does the ADM812SART-REEL provide an active-high or active-low reset output, and what are its drive capabilities?
The ADM812SART-REEL provides an active-high RESET output. It sources up to 150 µA at 0.8 × VCC (for VCC > 1.8 V) and sinks up to 1.2 mA with output voltage ≤0.3 V. This allows direct connection to standard 3.3 V CMOS inputs without external pull-up resistors, simplifying board layout and reducing BOM count in designs using the ADM812SART-REEL.
How does the manual reset (MR) input of the ADM812SART-REEL handle switch bounce and electrical noise?
The MR input of the ADM812SART-REEL is hardware-debounced to reject transients shorter than 100 ns and accept pulses longer than 10 µs. It triggers reset when pulled below 0.25 × VCC (or 0.8 V for higher VCC), making it inherently immune to mechanical switch bounce and EMI coupling-eliminating the need for external RC filters or firmware debouncing routines in systems relying on the ADM812SART-REEL.
Can the ADM812SART-REEL maintain a valid reset signal as the supply voltage collapses toward zero?
Yes-the ADM812SART-REEL guarantees valid RESET output down to VCC = 1 V. Below that, the output enters high-impedance state; however, a 100 kΩ pull-down resistor to GND (as recommended in the datasheet) ensures the signal remains logically low and prevents floating states that could cause spurious processor wake-up. This behavior is explicitly characterized and validated for the ADM812SART-REEL.
What package type and footprint does the ADM812SART-REEL use, and is it RoHS-compliant?
The ADM812SART-REEL uses the JEDEC-standard SOT-143 (RA-4) package: 4-pin, gull-wing, 1.4 mm × 2.9 mm body, 0.95 mm lead pitch. It is RoHS-compliant (indicated by "Z" suffix in ordering code variants), with lead-free terminations and compliant with EU Directive 2011/65/EU-fully supported in modern reflow processes and compatible with the ADM812SART-REEL's industrial and automotive deployment requirements.
ADM812SART-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 High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
ADM812SART-REEL FAQ
1.How can I place an order for ADM812SART-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812SART-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 ADM812SART-REEL reliable?
The price and inventory of ADM812SART-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812SART-REEL is usually 5 days.
3.What payment methods are accepted for ADM812SART-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812SART-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812SART-REEL?
ADM812SART-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812SART-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 ADM812SART-REEL?
For technical support, including ADM812SART-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812SART-REEL requirements.
6.How does Aetrix verify that ADM812SART-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812SART-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 ADM812SART-REEL meets industry standards.
7.What is the process for return or replacement of ADM812SART-REEL?
All ADM812SART-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812SART-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 ADM812SART-REEL part is unused and in its original packaging.
Return procedure for ADM812SART-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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