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Analog Devices Inc. ADM812LART-REEL7
- Part No.:
- ADM812LART-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812LART-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
ADM812LART-REEL7 from Analog Devices is a precision microprocessor supervisory circuit in 4-lead SOT-143 (RA-4) package, providing active-high RESET output with 4.63 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 voltage monitoring in embedded control systems.
For engineers reviewing the ADM812LART-REEL7 datasheet, ADM812LART-REEL7 pinout, ADM812LART-REEL7 application, or ADM812LART-REEL7 equivalent, this device delivers deterministic reset assertion down to VCC = 1 V, manual reset debouncing, glitch-immune power monitoring, and compatibility with 5 V supply rails in space-constrained industrial and automotive electronics.
Technical Context
The ADM812LART-REEL7 implements a precision bandgap reference-based voltage monitor with temperature-compensated threshold detection (30 ppm/°C), ensuring stable reset activation across −40°C to +85°C. Its internal timer guarantees ≥140 ms RESET pulse width after VCC rises above 4.63 V, with propagation delay under 0.5 µs.
It features a debounced manual reset input (MR) rejecting <100 ns glitches and accepting >10 µs pulses, and supports direct interface to CMOS logic via an active-high RESET output that sources 150 µA at 0.8 × VCC when VCC > VTH(MAX).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V (typical at 25°C); triggers reset when VCC falls below this value, supporting 5 V system supervision with ±4% tolerance over full temperature range. |
| RESET Output Polarity | Active high; holds high during VCC undervoltage or MR assertion, then remains high for ≥140 ms after VCC recovery - directly compatible with processors requiring active-high reset. |
| Supply Current | 5 µA typical at VCC < 3.6 V; enables ultra-low-power operation in battery-backed or energy-sensitive applications without compromising supervision reliability. |
| Operating Temperature | −40°C to +85°C; qualified for industrial and automotive environments where thermal stability of reset timing is critical to system safety. |
| Power-On Reset Timeout | 140 ms minimum; ensures sufficient stabilization time for 5 V microcontrollers and peripheral ICs before release from reset state. |
| Manual Reset Pulse Width | ≥10 µs required; rejects switch bounce and EMI-induced transients, enabling robust field-serviceable reset capability without external filtering. |
| VCC Range | 1.0 V to 5.5 V; maintains valid RESET output down to 1 V, preventing spurious processor wake-up during brownout conditions. |
Pinout & Package
ADM812LART-REEL7 is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package, 2.90 mm × 1.40 mm × 1.07 mm, with gull-wing leads and 0.95 mm 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 accurate threshold referencing and noise immunity. |
| 2 RESET | Active-high reset output | Open-drain-compatible output sourcing up to 150 µA at 0.8 × VCC; requires external pull-up for logic-high drive strength in 5 V systems. |
| 3 MR | Debounced manual reset input | Active-low input rejecting <100 ns noise; asserts RESET when pulled below 0.8 V (VCC > VTH(MAX)) - connects to pushbutton or FPGA GPIO. |
| 4 VCC | Monitored supply input | Primary 5 V rail input; internally compared against 4.63 V reference; decoupling with 0.1 µF capacitor to GND is mandatory for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.63 V ±0.125 V over −40°C to +85°C (±2.7% max deviation), eliminating need for external trimming in 5 V systems. |
| Ultra-low quiescent current | 5 µA typical enables integration into always-on subsystems without measurable battery drain in portable instrumentation. |
| Valid reset down to 1 V VCC | Ensures processor remains held in reset during deep brownout, preventing undefined execution states as supply collapses. |
| Glitch-immune manual reset | Hardware-debounced MR input eliminates need for software debounce routines or RC filters in noisy industrial control panels. |
| Temperature-stable timing | RESET timeout drift <±5% across full operating range, guaranteeing consistent boot sequencing in thermal-cycling environments. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5 V MCU supply in programmable logic controller exposed to wide ambient temperature swings and EMI from motor drives. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to ARM Cortex-M7 core during undervoltage events and manual service reset. Use Value: Prevents firmware corruption during line transients by holding MCU in reset until 5 V rail stabilizes for ≥140 ms post-recovery. |
Use Scenario: Supervises 5 V domain powering door lock actuators, window lift drivers, and CAN transceivers in vehicle body electronics. IC Role / Device Role / Timing Role: Primary reset generator interfacing with Infineon AURIX TC3xx MCU, synchronized to ignition-on power ramp. Use Value: Guarantees deterministic boot sequence despite battery voltage sag during cold cranking (down to 6.5 V system level). |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Ensures safe startup of dual-core diagnostic processor in Class II medical equipment with isolated 5 V DC-DC converter. IC Role / Device Role / Timing Role: Fault-tolerant reset source meeting IEC 60601-1 requirements for fail-safe power sequencing. Use Value: Maintains reset assertion down to 1 V VCC, eliminating risk of partial initialization during AC mains interruption. |
Use Scenario: Supervises metrology SoC and secure element in ANSI C12.22-compliant electricity meter with tamper-detection circuitry. IC Role / Device Role / Timing Role: System-level reset coordinator triggered by both power loss and hardware tamper signal via MR pin. Use Value: Enables certified secure shutdown and cryptographic key erasure within guaranteed 140 ms window after supply collapse. |
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 | 4.63 V threshold, SOT-143, but 20 µA max supply current vs. 15 µA max for ADM812LART-REEL7; no guaranteed 1 V reset validity. | Lacks sub-1 V reset hold capability; unsuitable for brownout-resilient designs requiring guaranteed reset below 1.2 V. | Select ADM812LART-REEL7 when system-level safety mandates reset assertion down to 1 V VCC. |
| TPS3808G33DBVR | 3.3 V fixed threshold (not 4.63 V); 1.5 µA typical current; 200 ms reset timeout; SOT-23-5 package - different footprint and voltage target. | Designed for 3.3 V domains only; incompatible pinout and threshold; requires PCB redesign and voltage scaling analysis. | Choose ADM812LART-REEL7 for drop-in replacement in existing 5 V supervisory circuits using SOT-143 layout. |
Compared with MAX812RUS+T and TPS3808G33DBVR, ADM812LART-REEL7 uniquely combines 4.63 V threshold, SOT-143 compatibility, 1 V minimum VCC reset hold, and <5 µA quiescent current - making it optimal for legacy 5 V industrial controllers requiring zero-layout-change upgrades.
Availability
ADM812LART-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ADM812LART-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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM812LART-REEL7 belongs to the ADM811/ADM812 family of microprocessor supervisory circuits, engineered for deterministic power-on reset, brownout protection, and manual reset debouncing in mission-critical embedded systems.
FAQ
What is the exact reset threshold voltage of ADM812LART-REEL7 and its tolerance over temperature?
The ADM812LART-REEL7 has a nominal reset threshold of 4.63 V at 25°C, with guaranteed range of 4.50 V to 4.75 V over −40°C to +85°C. This 5.4% total span ensures reliable 5 V supply supervision while accommodating standard PSU tolerances and thermal drift.
Does ADM812LART-REEL7 support active-high reset output, and how is it implemented?
Yes, ADM812LART-REEL7 provides an active-high RESET output. It sources current when asserted, delivering ≥0.8 × VCC at 150 µA load for VCC > VTH(MAX). An external pull-up resistor is recommended for full logic-high drive strength in 5 V systems.
What is the minimum VCC level at which ADM812LART-REEL7 maintains a valid RESET output?
ADM812LART-REEL7 asserts and holds RESET valid down to VCC = 1.0 V, ensuring the microprocessor remains safely held in reset during severe brownout conditions - a key differentiator versus alternatives that lose reset validity below 1.2 V.
How does the manual reset (MR) pin of ADM812LART-REEL7 handle switch bounce and noise?
The MR pin of ADM812LART-REEL7 incorporates hardware debounce: it ignores transients shorter than 100 ns and reliably detects pulses longer than 10 µs. This eliminates need for external RC filters or firmware debounce when interfacing with mechanical switches.
Is ADM812LART-REEL7 RoHS compliant, and what is its packaging format?
Yes, ADM812LART-REEL7 is RoHS compliant (lead-free, halogen-free) and supplied in tape-and-reel format: 3,000 units per REEL7 reel, housed in JEDEC-standard 4-lead SOT-143 (RA-4) package with MBV top-side marking.
ADM812LART-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:
- 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
ADM812LART-REEL7 FAQ
1.How can I place an order for ADM812LART-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812LART-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 ADM812LART-REEL7 reliable?
The price and inventory of ADM812LART-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812LART-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM812LART-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812LART-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812LART-REEL7?
ADM812LART-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812LART-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 ADM812LART-REEL7?
For technical support, including ADM812LART-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812LART-REEL7 requirements.
6.How does Aetrix verify that ADM812LART-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM812LART-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 ADM812LART-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM812LART-REEL7?
All ADM812LART-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM812LART-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 ADM812LART-REEL7 part is unused and in its original packaging.
Return procedure for ADM812LART-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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