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Analog Devices Inc. ADM812MARTZ-REEL
- Part No.:
- ADM812MARTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
ADM812MARTZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
ADM812MARTZ-REEL from Analog Devices is a microprocessor supervisory IC in 4-lead SOT-143 (RA-4) package, providing active-high reset output with 4.38 V 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 ADM812MARTZ-REEL datasheet, ADM812MARTZ-REEL pinout, ADM812MARTZ-REEL application, or ADM812MARTZ-REEL equivalent, this page delivers verified functional identity, precise reset threshold behavior, manual reset timing constraints, glitch-immune MR interface, and RoHS-compliant SOT-143 packaging details essential for automotive and industrial power sequencing design.
Technical Context
The ADM812MARTZ-REEL implements a precision bandgap voltage reference with 30 ppm/°C temperature coefficient and internal debounced manual reset circuitry that rejects pulses under 100 ns while guaranteeing response to ≥10 µs inputs. Its reset generator holds RESET high for 240 ms (typical) after VCC rises above 4.38 V, ensuring stable microprocessor boot.
It monitors VCC across 1.0 V to 5.5 V, asserting valid RESET output down to VCC = 1 V with 0.4 V low-level sink capability at 3.2 mA, and supports direct interfacing to both 3 V and 5 V logic via VCC-proportional high-level output (0.8 × VCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V (typical at 25°C), ±0.16 V over −40°C to +85°C - ensures reliable detection of 5 V supply brownout before microprocessor malfunction. |
| Reset Timeout | 140–560 ms - guarantees sufficient hold time for processor core and peripherals to stabilize after power-up or recovery. |
| Supply Current | 5 µA typical at VCC < 3.6 V - enables use in battery-backed or ultra-low-power systems without compromising supervision integrity. |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive under-hood environments requiring extended thermal reliability. |
| MR Input Logic | Active-low, 10 µs minimum pulse width, 100 ns glitch immunity - allows robust external reset button or controller-driven reset without false triggering. |
| RESET Output | Active-high, 0.8 × VCC high-level (ISOURCE = 150 µA), 0.4 V low-level (ISINK = 3.2 mA) - directly interfaces to 3 V/5 V CMOS inputs without level-shifting. |
| ESD Rating | 3 kV HBM - provides built-in protection against handling and board-level electrostatic discharge events. |
Pinout & Package
ADM812MARTZ-REEL is housed in a JEDEC-compliant 4-lead SOT-143 (RA-4) package with 1.92 mm × 1.40 mm footprint, 0.90 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 and decoupling capacitor connection point. |
| 2 RESET | Active-High Reset Output | Drives high during VCC undervoltage or MR assertion; remains high ≥240 ms after VCC recovery to prevent premature CPU release. |
| 3 MR | Manual Reset Input | Debounced active-low input accepting ≥10 µs pulses; ignores noise spikes <100 ns; floats when unused. |
| 4 VCC | Monitored Supply Input | Accepts 1.0–5.5 V; requires 0.1 µF decoupling capacitor to GND for noise immunity and accurate threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Voltage Monitoring | 4.38 V reset threshold with ±3.7% tolerance over full temperature range - eliminates need for external resistor divider in 5 V system supervision. |
| Low-Power Operation | 5 µA typical quiescent current - extends battery life in portable instruments and enables always-on monitoring in standby modes. |
| Valid Reset Down to 1 V VCC | RESET remains asserted low-to-high transition valid until VCC drops to 1 V - prevents spurious CPU wake-up during controlled shutdown. |
| Built-in Manual Reset Debounce | Hardware-filtered MR input rejecting sub-100 ns transients - removes need for external RC filter or firmware debounce logic. |
| RoHS-Compliant Packaging | Z-suffix indicates lead-free, halogen-free RA-4 package - meets IPC/JEDEC J-STD-020 reflow requirements and environmental compliance mandates. |
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 wide ambient temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Supervises 5 V system rail and asserts active-high RESET to halt CPU execution during brownout, then holds reset for 240 ms post-recovery to ensure deterministic boot. Use Value: Prevents corrupted I/O state or watchdog timeout lockup by guaranteeing clean restart after transient supply dips common in motor-driven plant infrastructure. |
Use Scenario: Reliable reset generation for microcontrollers managing door locks, lighting, and window controls in vehicles exposed to cold cranking and load dump conditions. IC Role / Device Role / Timing Role: Monitors main 5 V supply derived from vehicle battery; triggers RESET on voltage sag below 4.38 V and sustains it through 140+ ms stabilization period. Use Value: Eliminates erratic behavior during engine start-up by holding MCU in reset until regulated 5 V rail settles, meeting ISO 16750-2 cold-cranking voltage profile requirements. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Ensuring safe, repeatable boot sequence in Class II medical devices where unintended operation could compromise patient safety during power interruption. IC Role / Device Role / Timing Role: Provides fail-safe reset signal tied to primary 3.3 V logic rail; manual reset input connected to service-mode button for field technician-initiated recovery. Use Value: Meets IEC 62304 software lifecycle requirements by enforcing hardware-enforced reset on supply anomaly, preventing uncontrolled state transitions in safety-critical firmware. |
Use Scenario: Maintaining data integrity and secure boot in utility-grade meters subjected to grid fluctuations, lightning-induced surges, and long-term storage at temperature extremes. IC Role / Device Role / Timing Role: Supervises isolated 3.3 V supply feeding metrology ASIC and secure bootloader; RESET output drives POR circuitry with guaranteed 240 ms hold time. Use Value: Guarantees EEPROM write completion and cryptographic key validation before application code execution, satisfying ANSI C12.22 and DLMS/COSEM security mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX812MESA+ | 4.40 V reset threshold, 20 µA max supply current, SO-8 package (larger footprint, different pinout) | Requires PCB layout change; lacks SOT-143 compatibility and same MR timing specs | Select only if SO-8 assembly is already standardized and 0.02 V threshold offset is acceptable in 5 V system margin analysis. |
| TPS3808G33DBVR | 3.3 V fixed threshold, 1.6 µA typical current, SOT-23-5 package, no manual reset input | Cannot replace ADM812MARTZ-REEL in designs requiring MR functionality or 4.38 V threshold for 5 V rail supervision | Consider only for new 3.3 V-only designs where ultra-low power dominates and manual reset is handled elsewhere. |
Compared with MAX812MESA+ and TPS3808G33DBVR, the ADM812MARTZ-REEL uniquely combines 4.38 V precision threshold, SOT-143 space efficiency, integrated debounced MR, and validated −40°C to +85°C performance-making it irreplaceable in compact, thermally demanding 5 V microcontroller supervision without layout or firmware redesign.
Availability
ADM812MARTZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, smart energy meters, and safety-critical instrumentation requiring stable component supply with full RoHS compliance and traceable sourcing.
Supply support for ADM812MARTZ-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.
The ADM812MARTZ-REEL belongs to the ADM811/ADM812 microprocessor supervisory family, engineered for dependable power-on reset and supply voltage monitoring in harsh industrial, automotive, and medical environments where deterministic system startup is non-negotiable.
FAQ
What is the exact reset threshold voltage of the ADM812MARTZ-REEL?
The ADM812MARTZ-REEL has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.25 V to 4.50 V across −40°C to +85°C. This value is factory-trimmed and specified in Table 1 of the Rev. H datasheet for the M-suffix variant, making it suitable for supervising standard 5 V supplies with adequate margin against brownout.
Does the ADM812MARTZ-REEL provide active-high or active-low reset output?
The ADM812MARTZ-REEL provides an active-high RESET output, as confirmed by its part number suffix "M" (indicating 4.38 V threshold) and "2" (denoting ADM812 series). Unlike the ADM811 variant, the ADM812MARTZ-REEL asserts RESET high during undervoltage or manual reset assertion and holds it high for ≥240 ms after VCC recovery.
What package type and lead count does the ADM812MARTZ-REEL use?
The ADM812MARTZ-REEL uses a 4-lead SOT-143 (JEDEC RA-4) package, measuring 1.92 mm × 1.40 mm with gull-wing leads. This compact surface-mount outline is explicitly documented in Figure 12 and the Ordering Guide of the ADM811/ADM812 Rev. H datasheet, and the "Z" suffix confirms RoHS-compliant lead-free construction.
Can the ADM812MARTZ-REEL operate with supply voltages below 3 V?
Yes, the ADM812MARTZ-REEL operates with VCC from 1.0 V to 5.5 V across its full temperature range. Its reset function remains active down to 1.0 V, and the RESET output retains valid logic levels (0.4 V low, 0.8 × VCC high) even at VCC = 1.2 V, enabling graceful shutdown sequencing in multi-rail systems with staggered power-down.
Is manual reset functionality available on the ADM812MARTZ-REEL, and what are its timing requirements?
Yes, the ADM812MARTZ-REEL includes a debounced manual reset (MR) input on Pin 3. It requires a minimum pulse width of 10 µs and rejects glitches shorter than 100 ns, as verified in Table 1 and the Circuit Information section. The MR pin is active-low and must be pulled high (via internal or external means) when not in use to avoid unintended reset assertion.
ADM812MARTZ-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:
- 4.38V
- 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
ADM812MARTZ-REEL FAQ
1.How can I place an order for ADM812MARTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM812MARTZ-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 ADM812MARTZ-REEL reliable?
The price and inventory of ADM812MARTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM812MARTZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM812MARTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM812MARTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM812MARTZ-REEL?
ADM812MARTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM812MARTZ-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 ADM812MARTZ-REEL?
For technical support, including ADM812MARTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM812MARTZ-REEL requirements.
6.How does Aetrix verify that ADM812MARTZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM812MARTZ-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 ADM812MARTZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM812MARTZ-REEL?
All ADM812MARTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM812MARTZ-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 ADM812MARTZ-REEL part is unused and in its original packaging.
Return procedure for ADM812MARTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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