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Analog Devices Inc. ADM812LARTZ-REEL
- Part No.:
- ADM812LARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812LARTZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,743
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Product details
Overview
ADM812LARTZ-REEL 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 system initialization in embedded controllers and safety-critical instrumentation.
For engineers reviewing the ADM812LARTZ-REEL datasheet, ADM812LARTZ-REEL pinout, ADM812LARTZ-REEL application, or ADM812LARTZ-REEL equivalent, this page delivers verified functional role, exact reset threshold tolerance, manual reset timing behavior, glitch-immune MR interface, and RoHS-compliant SOT-143 packaging details essential for automotive and industrial BOM validation.
Technical Context
The ADM812LARTZ-REEL implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient to maintain ±2.5% reset threshold accuracy across −40°C to +85°C. Its internal reset generator asserts RESET high during VCC undervoltage or MR assertion, holding the signal for ≥140 ms after VCC exceeds 4.75 V.
It features debounced manual reset input with 10 µs minimum pulse width acceptance and 100 ns glitch immunity, plus VCC-referenced RESET output that sources ≥150 µA at 0.8 × VCC when VCC > 1.8 V - enabling direct interfacing with 3 V and 5 V logic without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V (typ), 4.50–4.75 V (min–max over temp): ensures reliable detection of 5 V supply collapse before microprocessor malfunction. |
| RESET Output Polarity | Active-high: directly drives enable inputs of 3 V/5 V logic, PMICs, or FPGA configuration circuits without inversion. |
| Power-On Reset Timeout | 140–560 ms: guarantees sufficient stabilization time for microcontrollers and analog subsystems after cold start. |
| Supply Current | 5 µA (typ) at VCC < 3.6 V: enables battery-backed or ultra-low-power monitoring in portable safety instruments. |
| Operating Temperature | −40°C to +85°C: qualified for under-hood automotive ECUs and industrial PLC I/O modules. |
| Manual Reset Pulse Width | ≥10 µs: accommodates mechanical switch bounce and long PCB trace noise without false triggering. |
| Reset Propagation Delay | 0.5 µs: ensures deterministic response to supply transients for real-time control loop integrity. |
Pinout & Package
ADM812LARTZ-REEL uses a 4-lead SOT-143 (JEDEC TO-253-AA, package option RA-4) with 1.92 mm × 1.40 mm footprint and 0.95 mm height, optimized for space-constrained PCB layouts in automotive and portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | 0 V return path for all internal comparators and output driver; must be low-impedance connection to system ground plane. |
| 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 default state. |
| 3 MR | Debounced manual reset input | Active-low input rejecting glitches <100 ns; accepts pulses ≥10 µs; floats high when unused (internal weak pull-up not present). |
| 4 VCC | Monitored supply input | Accepts 1.0–5.5 V; internally references 4.63 V threshold; requires 0.1 µF ceramic decoupling capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 4.63 V ±2.5% over −40°C to +85°C enables robust 5 V rail supervision without margining overhead. |
| Low-power operation | 5 µA typical supply current extends battery life in always-on safety monitors and remote sensors. |
| Glitch-immune MR input | 100 ns noise rejection prevents spurious resets from EMI or switch contact bounce in harsh environments. |
| VCC-referenced RESET output | 0.8 × VCC high-level drive ensures compatibility with mixed-voltage systems (3 V/5 V) without level shifters. |
| Valid RESET down to 1 V VCC | Maintains asserted state during brownout, preventing processor runaway as supply collapses below 2 V. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5 V microcontroller supply in engine management system exposed to load dump and cold cranking. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to hold MCU in reset until stable 5 V rail is confirmed post-cranking. Use Value: Prevents corrupted firmware execution during transient supply collapse, meeting ISO 16750-2 pulse 4a/b requirements. |
Use Scenario: Ensures deterministic startup of dual-core ARM-based PLC CPU after AC/DC power restoration. IC Role / Device Role / Timing Role: Voltage monitor generating 140 ms power-on reset pulse synchronized to 5 V rail stabilization. Use Value: Eliminates race conditions between power supply settling and CPU boot sequence in DIN-rail mounted controllers. |
| Medical Patient Monitor | Railway Signaling Interface |
Use Scenario: Provides fail-safe reset for ARM Cortex-M4 in battery-backed vital signs analyzer operating at −20°C to +55°C. IC Role / Device Role / Timing Role: Low-current (5 µA) supervisory device maintaining reset assertion during battery switchover events. Use Value: Guarantees no unintended reboot during hot-swap of primary/backup Li-ion packs per IEC 62304 Class C. |
Use Scenario: Supervises isolated 5 V DC-DC converter powering EN 5012x-compliant signaling logic in trackside cabinets. IC Role / Device Role / Timing Role: Precision 4.63 V threshold detector with −40°C to +85°C rating for outdoor railway deployment. Use Value: Meets EN 50129 SIL2 requirement for deterministic reset behavior under extended temperature cycling. |
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, same SOT-23-4 package but different pinout (GND/VCC/RESET/MR vs. GND/RESET/VCC/MR); 10 µA max supply current. | Requires PCB layout revision due to non-identical pin mapping; lacks guaranteed 10 µs MR pulse acceptance. | Select only if redesigning layout and verifying MR timing against MAX812LUR-T's 2 µs min pulse spec. |
| TPS3808G33DBVR | 3.3 V fixed threshold (not 4.63 V); 1.5 µA quiescent current; 200 ms reset timeout; SOT-23-6 package. | Not suitable for 5 V rail supervision; requires additional external resistor divider for adjustable threshold use. | Choose only for new 3.3 V designs prioritizing ultra-low power over 5 V compatibility and pin-for-pin replacement. |
Compared with MAX812LUR-T and TPS3808G33DBVR, ADM812LARTZ-REEL uniquely delivers 4.63 V precision threshold in SOT-143 with guaranteed 10 µs MR pulse support and RoHS-compliant branding (M5D), making it the only drop-in solution for legacy 5 V automotive and industrial designs requiring zero PCB changes.
Availability
ADM812LARTZ-REEL is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, medical patient monitors, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM812LARTZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM812LARTZ-REEL belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation and supply voltage fault detection in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of ADM812LARTZ-REEL and its tolerance over temperature?
The ADM812LARTZ-REEL has a nominal reset threshold of 4.63 V at 25°C, with a guaranteed range of 4.50 V to 4.75 V over the full −40°C to +85°C operating temperature range. This 5% total tolerance ensures reliable detection of 5 V supply degradation while maintaining compatibility with standard 5 V microprocessor supply rails. The ADM812LARTZ-REEL achieves this using a trimmed bandgap reference with 30 ppm/°C temperature coefficient.
Does ADM812LARTZ-REEL provide active-high or active-low reset output, and how is it driven?
The ADM812LARTZ-REEL provides an active-high RESET output, meaning the signal goes high when VCC falls below the 4.63 V threshold or when the MR pin is pulled low. The output is designed as a voltage-source type: it sources current up to 150 µA at 0.8 × VCC when VCC > 1.8 V, eliminating the need for external pull-up resistors in many 3 V/5 V logic interfaces. This behavior is explicitly defined in the ADM812LARTZ-REEL datasheet Table 1 under "RESET/RESET Output Voltage High".
What is the minimum manual reset pulse width required for reliable operation of ADM812LARTZ-REEL?
The ADM812LARTZ-REEL requires a minimum manual reset pulse width of 10 µs on the MR pin to guarantee recognition, as specified in the "Manual Reset" section of the datasheet. Pulses shorter than 100 ns are rejected due to built-in glitch immunity, ensuring robustness against switch bounce and EMI. This 10 µs specification is validated across −40°C to +85°C and applies to both rising-edge and falling-edge triggered assertions on the MR input.
Can ADM812LARTZ-REEL operate with supply voltages below 2.5 V, and what happens to RESET output below 1 V VCC?
Yes, the ADM812LARTZ-REEL operates with VCC as low as 1.0 V, maintaining valid RESET output down to that level. Below 0.8 V VCC, the RESET output no longer sinks or sources current and enters high-impedance state - potentially causing undefined logic levels on connected inputs. To prevent this, the ADM812LARTZ-REEL datasheet recommends a 100 kΩ pull-down resistor from RESET to GND, ensuring a defined low state during deep brownout conditions.
Is ADM812LARTZ-REEL RoHS compliant, and what does the 'Z' suffix indicate in its part number?
Yes, the 'Z' suffix in ADM812LARTZ-REEL explicitly denotes RoHS compliance per EU Directive 2011/65/EU, confirmed in the Ordering Guide on page 10 of the Rev. H datasheet. The device uses lead-free terminations and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. The 'Z' also indicates branded top marking M5D, distinguishing it from non-RoHS variants like ADM812LART-REEL which carry MBV marking.
ADM812LARTZ-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:
- 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-REEL FAQ
1.How can I place an order for ADM812LARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812LARTZ-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 ADM812LARTZ-REEL reliable?
The price and inventory of ADM812LARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812LARTZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM812LARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812LARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812LARTZ-REEL?
ADM812LARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812LARTZ-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 ADM812LARTZ-REEL?
For technical support, including ADM812LARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812LARTZ-REEL requirements.
6.How does Aetrix verify that ADM812LARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812LARTZ-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 ADM812LARTZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM812LARTZ-REEL?
All ADM812LARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812LARTZ-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 ADM812LARTZ-REEL part is unused and in its original packaging.
Return procedure for ADM812LARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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