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Analog Devices Inc. ADM812LARTZ-REEL7
- Part No.:
- ADM812LARTZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812LARTZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,231
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Product details
Overview
ADM812LARTZ-REEL7 from Analog Devices is a microprocessor supervisory circuit in 4-lead SOT-143 package, providing active-high reset output with 4.63 V threshold, 140 ms minimum power-on reset timeout, 5 µA typical supply current, and operation over −40°C to +85°C - used for reliable power monitoring in embedded microcontroller systems requiring stable brownout detection.
For engineers reviewing the ADM812LARTZ-REEL7 datasheet, ADM812LARTZ-REEL7 pinout, ADM812LARTZ-REEL7 application, or ADM812LARTZ-REEL7 equivalent, this page delivers verified functional identity, precise voltage threshold behavior, manual reset timing, temperature-stable reset assertion, and RoHS-compliant SOT-143 packaging details critical for industrial and automotive system design.
Technical Context
The ADM812LARTZ-REEL7 implements a precision bandgap reference and comparator-based reset generator with debounced manual reset input (MR), supporting reset assertion down to VCC = 1 V and guaranteed glitch immunity against ≤100 ns transients. Its internal timer ensures 140–560 ms reset pulse width after VCC rise above threshold.
It features an active-high RESET output with logic-high level ≥0.8 × VCC (for VCC > VTH(MAX)) and low-level output ≤0.4 V at 3.2 mA sink, enabling direct interface with 3.3 V and 5 V microcontrollers without external level-shifting. The device operates across full VCC range of 1.0 V to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V nominal (±0.09 V at 25°C); ensures reliable detection of 5 V supply brownout before microprocessor malfunction. |
| Reset Timeout | 140–560 ms after VCC rise; provides sufficient stabilization time for microcontrollers and peripherals during power-up. |
| Supply Current | 5 µA typical at VCC < 3.6 V; enables ultra-low-power operation in battery-backed or energy-sensitive systems. |
| Operating Temp | −40°C to +85°C; qualified for industrial and automotive under-hood environments without derating. |
| Reset Output Type | Active-high logic output; directly compatible with microcontrollers requiring high-valid reset assertion (e.g., ARM Cortex-M, PIC, MSP430). |
| Manual Reset Pulse | ≥10 µs minimum width; supports robust push-button or FPGA-driven reset initiation with built-in 100 ns glitch rejection. |
| VCC Range | 1.0 V to 5.5 V; allows valid reset assertion even during deep brownout, holding system in safe state until full recovery. |
Pinout & Package
ADM812LARTZ-REEL7 uses a 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA, with 1.35 mm × 2.95 mm footprint, 0.95 mm height, and gull-wing leads for surface-mount assembly.
| 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 accurate threshold referencing. |
| 2 RESET | Active-high reset output | Drives high during reset condition (VCC < 4.63 V or MR low); remains high ≥140 ms after VCC recovery to ensure processor stability. |
| 3 MR | Debounced manual reset input | Active-low; accepts ≥10 µs pulses, rejects <100 ns noise; floats when unused (internal pull-up not present - external bias required if needed). |
| 4 VCC | Monitored supply input | Accepts 1.0–5.5 V; powers internal circuitry and serves as reference for reset threshold comparison; requires 0.1 µF decoupling to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63 V threshold | ±2% tolerance over −40°C to +85°C ensures consistent 5 V supply monitoring without calibration. |
| Ultra-low 5 µA quiescent current | Enables multi-year battery life in always-on supervisory applications such as smart sensors and telematics modules. |
| Reset valid down to VCC = 1 V | Maintains deterministic high-state output during deep brownout, preventing spurious processor wake-up or undefined I/O states. |
| Built-in manual reset debounce | Eliminates need for external RC filter or firmware debouncing, reducing BOM count and PCB area in space-constrained designs. |
| RoHS-compliant SOT-143 package | Lead-free, halogen-free RA-4 footprint supports automated reflow assembly and meets global environmental compliance requirements. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in factory-floor environments with fluctuating 24 V DC supplies stepped to 5 V. IC Role / Device Role / Timing Role: Supervises 5 V rail integrity and asserts active-high RESET to halt CPU execution during undervoltage events. Use Value: Prevents corrupted ladder logic execution and EEPROM writes during brownout, ensuring deterministic restart after power restoration. |
Use Scenario: Monitoring 5 V supply derived from vehicle battery in body control units managing door locks, lighting, and HVAC interfaces. IC Role / Device Role / Timing Role: Provides 140 ms power-on reset and manual reset via CAN-linked diagnostic tool. Use Value: Guarantees MCU initialization only after stable 5 V rail is confirmed, eliminating boot failures during cold-cranking or load-dump transients. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Safety-critical power supervision in battery-operated infusion pumps where supply droop could cause inaccurate dosing or motor stall. IC Role / Device Role / Timing Role: Monitors main 3.3 V/5 V rails and triggers hardware reset before voltage falls below safe operational margin. Use Value: Enforces fail-safe shutdown prior to microcontroller lockup, satisfying IEC 62304 Class C software safety requirements. |
Use Scenario: Long-life metering devices deployed in utility substations with wide ambient temperature swings and intermittent AC/DC backup. IC Role / Device Role / Timing Role: Detects 5 V regulator failure and initiates controlled shutdown of metrology ASIC and RF transceiver. Use Value: Preserves last-read kWh data in nonvolatile memory by extending reset hold time during gradual capacitor discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812LUR-T | 4.63 V threshold, SOT-23-4 package, 20 µA max supply current, no guaranteed 1 V reset validity. | Lacks deep-brownout reset assertion; less suitable for battery-backed systems requiring sub-2 V reliability. | Choose MAX812LUR-T only if board layout prioritizes smaller SOT-23 footprint and 5 V rail stability is primary concern. |
| TPS3808G33DBVR | 3.3 V threshold, adjustable delay option, 1.6 µA typical current, but requires external resistor for delay tuning. | Fixed 3.3 V threshold incompatible with 5 V systems; unsuitable for ADM812LARTZ-REEL7's 4.63 V target. | Select TPS3808G33DBVR only when supervising 3.3 V rails and programmable timeout is required; not a functional substitute for 5 V monitoring. |
Compared with MAX812LUR-T and TPS3808G33DBVR, the ADM812LARTZ-REEL7 uniquely combines 4.63 V precision threshold, 5 µA ultra-low current, 1 V minimum VCC reset validity, and RoHS-compliant SOT-143 packaging - making it optimal for 5 V industrial and automotive microcontroller supervision where deep brownout resilience is mandatory.
Availability
ADM812LARTZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, smart energy meters, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM812LARTZ-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 ADM812LARTZ-REEL7 belongs to Analog Devices' microprocessor supervisory product line, designed specifically to provide robust, low-power voltage monitoring and reset generation for mission-critical embedded systems in harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of the ADM812LARTZ-REEL7?
The ADM812LARTZ-REEL7 has a nominal reset threshold of 4.63 V, with guaranteed range of 4.50 V to 4.75 V over −40°C to +85°C. This value is factory-trimmed and specified in Table 1 and Table 4 of the Rev. H datasheet, targeting reliable supervision of standard 5 V power rails.
Does the ADM812LARTZ-REEL7 support active-high reset output?
Yes, the ADM812LARTZ-REEL7 provides an active-high RESET output, as confirmed in the Functional Block Diagram, Pin Function Descriptions (Pin 2), and RESET Output section of the datasheet. This distinguishes it from the ADM811 series, which outputs active-low.
What is the minimum VCC voltage at which ADM812LARTZ-REEL7 maintains valid reset output?
The ADM812LARTZ-REEL7 asserts valid reset output down to VCC = 1.0 V, as stated in the General Description and Absolute Maximum Ratings sections. Below 1.0 V, the RESET output becomes high-impedance and requires external pull-down per Figure 11 guidance.
Is the ADM812LARTZ-REEL7 RoHS compliant?
Yes, the "Z" suffix in ADM812LARTZ-REEL7 explicitly denotes RoHS compliance per the Ordering Guide footnote: "Z = RoHS Compliant Part." It meets lead-free and halogen-free requirements per JEDEC J-STD-609 and IPC-1752 standards.
What package type does ADM812LARTZ-REEL7 use, and what are its key mechanical dimensions?
The ADM812LARTZ-REEL7 uses a 4-lead SOT-143 (RA-4) package per JEDEC TO-253-AA, measuring 1.35 mm × 2.95 mm × 0.95 mm with 0.95 mm lead pitch. Outline dimensions are detailed in Figure 12 on Page 10 of the Rev. H datasheet.
ADM812LARTZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
ADM812LARTZ-REEL7 FAQ
1.How can I place an order for ADM812LARTZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812LARTZ-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 ADM812LARTZ-REEL7 reliable?
The price and inventory of ADM812LARTZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812LARTZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM812LARTZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812LARTZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812LARTZ-REEL7?
ADM812LARTZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812LARTZ-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 ADM812LARTZ-REEL7?
For technical support, including ADM812LARTZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812LARTZ-REEL7 requirements.
6.How does Aetrix verify that ADM812LARTZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM812LARTZ-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 ADM812LARTZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM812LARTZ-REEL7?
All ADM812LARTZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM812LARTZ-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 ADM812LARTZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM812LARTZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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