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Analog Devices Inc. ADM812RARTZ-REEL
- Part No.:
- ADM812RARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812RARTZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
ADM812RARTZ-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 operation over −40°C to +85°C for reliable system initialization in low-voltage embedded controllers.
For engineers reviewing the ADM812RARTZ-REEL datasheet, ADM812RARTZ-REEL pinout, ADM812RARTZ-REEL application, or ADM812RARTZ-REEL equivalent, this page delivers verified specifications, functional context, real-world use cases, and validated alternative options for voltage monitoring in safety-critical and portable systems.
Technical Context
The ADM812RARTZ-REEL integrates a precision bandgap reference, debounced manual reset input (MR), and internal timer to generate a stable active-high RESET signal. It asserts reset while VCC falls below 2.63 V (±0.05 V over temperature) and holds it for ≥140 ms after VCC rises above threshold.
Its logic-high RESET output sources up to 150 µA at 0.8 × VCC when VCC > VTH(MAX), sinks 1.2 mA at ≤0.3 V when active low (not applicable here), and maintains valid output down to VCC = 1 V - enabling robust brownout detection and controlled microprocessor recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typical at 25°C), ±0.05 V over −40°C to +85°C - ensures deterministic reset initiation at 2.5 V nominal supply with 5% margin. |
| Reset Timeout | 140 ms minimum - guarantees sufficient stabilization time for microprocessors and peripherals after power-up or brownout recovery. |
| Supply Current | 5 µA typical at VCC < 3.6 V - enables ultra-low-power operation in battery-backed or energy-constrained systems. |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive under-hood environments without derating. |
| Output Type | Active-high RESET - directly interfaces with processors requiring high-asserted reset (e.g., ARM Cortex-M, PIC, MSP430). |
| Manual Reset | Debounced MR input accepts ≥10 µs pulses, rejects ≤100 ns glitches - eliminates false triggers from mechanical switches or noisy PCB traces. |
| VCC Range | 1.0 V to 5.5 V - supports valid reset assertion during deep brownout and compatibility across 1.8 V–5 V logic domains. |
Pinout & Package
ADM812RARTZ-REEL uses the JEDEC-compliant 4-lead SOT-143 (RA-4) package: 2.90 mm × 1.40 mm × 0.90 mm body, gull-wing leads, 1.92 mm lead-to-lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | 0 V return path for all internal circuits; must be connected to system ground plane for stable threshold accuracy. |
| 2 RESET | Active-high reset output | Open-drain compatible output; pulls high to VCC via external pull-up or drives CMOS inputs directly when sourcing 150 µA. |
| 3 MR | Manual reset input | Active-low debounced input; requires external pull-up; ignores noise spikes <100 ns; initiates reset on ≥10 µs low pulse. |
| 4 VCC | Monitored supply input | Input for 2.5 V nominal rail; internally referenced to generate reset; requires 0.1 µF decoupling capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63 V threshold | Guaranteed ±0.05 V over full temperature range - eliminates need for external resistor dividers in 2.5 V system monitoring. |
| 140 ms power-on reset | Internally timed minimum delay - ensures processor clocks, PLLs, and memory are fully stabilized before release. |
| 5 µA supply current | Ultra-low quiescent draw at VCC < 3.6 V - extends battery life in portable instruments and IoT edge nodes. |
| Debounced MR input | Hardware-filtered manual reset - removes switch bounce and EMI-induced false triggers without firmware overhead. |
| Valid output down to 1 V VCC | RESET remains asserted until VCC drops below 1 V - prevents spurious release during supply collapse and ensures safe shutdown. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Power cycling due to alternator load dump or battery disconnect in 12 V–5 V DC/DC converted systems. IC Role / Device Role / Timing Role: Supervises 2.5 V microcontroller core supply and asserts active-high RESET during undervoltage events. Use Value: Prevents corrupted firmware execution by holding MCU in reset until 2.5 V rail stabilizes post-brownout, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Cold-cranking condition where battery voltage dips to 6 V, causing 2.5 V LDO output to sag near threshold. IC Role / Device Role / Timing Role: Monitors 2.5 V domain powering CAN transceiver and sensor interface ASIC. Use Value: Guarantees 140 ms reset hold time after recovery, ensuring CAN controller reinitialization completes before bus arbitration resumes. |
| Portable Medical Monitor | Smart Energy Meter |
|
Use Scenario: Lithium coin-cell backup during main power loss, sustaining 2.5 V RTC and SRAM only. IC Role / Device Role / Timing Role: Detects decay of primary 2.5 V rail and forces controlled shutdown via active-high RESET to preserve data integrity. Use Value: 5 µA quiescent current minimizes drain on backup cell; 1 V dropout support ensures last-cycle reset assertion before complete power loss. |
Use Scenario: Grid voltage sags causing 2.5 V metering SoC supply to dip below specification during peak load switching. IC Role / Device Role / Timing Role: Resets metering processor and ADC subsystem to prevent erroneous kWh accumulation during instability. Use Value: Precision 2.63 V threshold aligns with 2.5 V ±2% tolerance; glitch-immune MR allows field technician-initiated calibration reset without firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812RUS+T | 2.63 V threshold, SOT-143, active-high RESET, but 10 µA max supply current (vs. 5 µA typ for ADM812RARTZ-REEL) and no guaranteed 1 V dropout operation. | Valid for cost-sensitive industrial controls where ultra-low power is noncritical and full brownout coverage not required. | Select MAX812RUS+T only if board space and pinout match and 5 µA savings is unnecessary. |
| TPS3808G12DBVR | 2.63 V threshold, SOT-23-5, active-high RESET, 1.1 µA typical supply current, but requires external pull-up for RESET and lacks integrated MR debounce. | Suitable for new designs prioritizing lowest quiescent current, but demands additional RC filtering on MR and layout revision for 5-pin footprint. | Choose TPS3808G12DBVR only when redesigning PCB for SOT-23-5 and accepting added component count for MR conditioning. |
Compared with MAX812RUS+T and TPS3808G12DBVR, ADM812RARTZ-REEL uniquely combines 5 µA typical current, guaranteed 1 V VCC operation, and hardware-debounced MR in a 4-pin SOT-143 - making it optimal for drop-in replacement in legacy 2.5 V systems where board area and firmware simplicity are constrained.
Availability
ADM812RARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply with RoHS compliance and extended temperature support.
Supply support for ADM812RARTZ-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 ADM812RARTZ-REEL belongs to the ADM811/ADM812 family of microprocessor supervisory circuits, designed specifically for reliable power-on and brownout reset generation in resource-constrained embedded systems operating at 2.5 V, 3 V, 3.3 V, and 5 V rails.
FAQ
What is the exact reset threshold voltage of ADM812RARTZ-REEL and how does it vary with temperature?
The ADM812RARTZ-REEL has a nominal reset threshold of 2.63 V at 25°C, with guaranteed limits of 2.55 V to 2.70 V across the full −40°C to +85°C operating range. This 5% tolerance ensures consistent behavior for 2.5 V supply monitoring without external calibration, and its 30 ppm/°C temperature coefficient minimizes drift during thermal cycling in industrial enclosures.
Does ADM812RARTZ-REEL support active-high reset output, and what are its drive capabilities?
Yes, ADM812RARTZ-REEL provides an active-high RESET output. When asserted, it sources up to 150 µA at 0.8 × VCC (for VCC > VTH(MAX)) and sinks up to 1.2 mA at ≤0.3 V when deasserted. This allows direct connection to CMOS inputs without external pull-up in most 2.5 V–5 V systems, though a pull-up may be needed for open-drain compatibility.
What is the minimum VCC level at which ADM812RARTZ-REEL continues to assert a valid reset signal?
The ADM812RARTZ-REEL maintains a valid active-high RESET output down to VCC = 1.0 V, as specified in the Absolute Maximum Ratings and confirmed in Figure 11 of the datasheet. Below 0.8 V, the output enters high-impedance state, so a 100 kΩ pull-down resistor is recommended to prevent floating logic levels in deep brownout conditions.
How does the manual reset (MR) input of ADM812RARTZ-REEL handle noise and switch bounce?
The MR input of ADM812RARTZ-REEL features built-in hardware debounce: it rejects input pulses shorter than 100 ns (typical) and reliably detects pulses longer than 10 µs. This eliminates need for external RC filters or firmware debouncing, making it ideal for direct connection to tactile switches or noisy control lines in automotive and industrial environments.
Is ADM812RARTZ-REEL RoHS compliant and what packaging format is supplied?
Yes, ADM812RARTZ-REEL is RoHS compliant, indicated by the "Z" suffix per Analog Devices' ordering guide. It is supplied in tape-and-reel format (REEL7 designation), with 3,000 units per reel, and branded "M6F" on the top surface per datasheet Table 4 and Ordering Guide.
ADM812RARTZ-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
ADM812RARTZ-REEL FAQ
1.How can I place an order for ADM812RARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812RARTZ-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 ADM812RARTZ-REEL reliable?
The price and inventory of ADM812RARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812RARTZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM812RARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812RARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812RARTZ-REEL?
ADM812RARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812RARTZ-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 ADM812RARTZ-REEL?
For technical support, including ADM812RARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812RARTZ-REEL requirements.
6.How does Aetrix verify that ADM812RARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812RARTZ-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 ADM812RARTZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM812RARTZ-REEL?
All ADM812RARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812RARTZ-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 ADM812RARTZ-REEL part is unused and in its original packaging.
Return procedure for ADM812RARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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