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Analog Devices Inc./Maxim Integrated MAX812SEUS+T
- Part No.:
- MAX812SEUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX812SEUS+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:9,461
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Product details
Overview
MAX812SEUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, designed to monitor 3.08V supply rails with ±0.05V threshold accuracy over -40°C to +85°C. It asserts reset for ≥140ms after VCC rises above threshold, features 2.7µA typical supply current at 3.6V, and includes debounced manual reset input (MR) with internal 20kΩ pull-up. Used in battery-powered instrumentation for reliable power-on/brownout reset.
For engineers reviewing the MAX812SEUS+T datasheet, MAX812SEUS+T pinout, MAX812SEUS+T application, or MAX812SEUS+T equivalent, key selection criteria include reset threshold voltage (3.08V), active-high output polarity, guaranteed operation down to VCC = 1.2V, MR glitch immunity (100ns), and SOT143 footprint compatibility with space-constrained embedded systems.
Technical Context
The MAX812SEUS+T implements a precision bandgap-based voltage comparator with fixed 3.08V reset threshold, temperature-compensated to 30ppm/°C. Its internal timer ensures minimum 140ms reset pulse width after VCC recovery, independent of supply ramp rate.
It features a dedicated manual reset input (MR) with 10µs minimum pulse width requirement and 0.5µs propagation delay to RESET output. The active-high RESET output drives CMOS loads with VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA) under specified VCC conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±0.05V tolerance at +25°C; guarantees reset assertion before system ICs drop below minimum operating voltage |
| Supply Current | 2.7µA typical at 3.6V, enabling multi-year battery life in portable equipment |
| Reset Timeout | 140ms minimum active period ensures full μP initialization before release |
| Operating Range | VCC = 1.2V to 5.5V across -40°C to +85°C; supports brownout detection down to near-UVLO levels |
| MR Glitch Immunity | Rejects transients ≤100ns on manual reset line, eliminating need for external RC filtering |
| Output Polarity | Active-high RESET output compatible with μPs requiring high-valid reset assertion |
Pinout & Package
MAX812SEUS+T is housed in a 4-pin SOT143 (U4+1) surface-mount package measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Return path for all internal circuitry; must be connected to system ground plane for stable threshold reference |
| 2 RESET | Active-high reset output | Drives high during reset condition; sinks 1.2mA at 0.3V max when asserted low (inactive state) |
| 3 MR | Manual reset input | Active-low trigger with internal 20kΩ pull-up; requires <10µs low pulse to initiate reset; immune to noise spikes ≤100ns |
| 4 VCC | Power supply input | Accepts 1.2V–5.5V; powers internal comparator and timer; threshold accuracy referenced to this rail |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V threshold | Matches 3.3V ±5% supply tolerance; prevents spurious resets while ensuring fail-safe response before μP undervoltage lockout |
| 140ms min reset timeout | Guarantees sufficient time for oscillator stabilization and register clearing in 8-bit and 16-bit microcontrollers |
| 20kΩ internal MR pull-up | Eliminates external resistor; allows direct connection of momentary switch to GND without debounce circuitry |
| 60ppm/°C tempco | Ensures threshold drift remains within ±0.015V over full industrial temperature range, preserving timing margin |
| 1.2V min VCC operation | Enables reset assertion during deep brownout events where other supervisors lose functionality |
Applications
| Battery-Powered Data Loggers | Industrial Sensor Nodes |
|---|---|
Use Scenario: Long-term environmental monitoring using coin-cell batteries with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to MSP430F5xx during power-up and brownout events. Use Value: 2.7µA quiescent current extends battery life beyond 5 years; 3.08V threshold aligns with LiFePO₄ discharge curve endpoint. | Use Scenario: Wireless vibration sensors deployed in factory machinery with 3.3V LDO-regulated power. IC Role / Device Role / Timing Role: Voltage monitor triggering cold-start reset of STM32L4 MCU upon power restoration after maintenance shutdown. Use Value: 140ms reset pulse ensures complete flash memory initialization; MR pin enables field-service reset via test point. |
| Medical Wearable Monitors | Smart Energy Meters |
Use Scenario: ECG patch devices powered by rechargeable Li-ion cells with tight voltage regulation requirements. IC Role / Device Role / Timing Role: Power supervisor validating 3.3V rail integrity before releasing AD8232 analog front-end and nRF52832 BLE SoC. Use Value: 30ppm/°C threshold stability maintains accuracy across body-temperature variations; SOT143 footprint saves critical board area. | Use Scenario: DIN-rail mounted meters exposed to wide ambient temperatures and conducted EMI. IC Role / Device Role / Timing Role: Brownout detector interfacing with Renesas RL78/I1C MCU via active-high reset input with series 4.7kΩ isolation resistor. Use Value: 100ns MR glitch immunity rejects switching noise from isolated DC-DC converters; guaranteed operation to -40°C ensures winter deployment reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G30DBVR | 3.0V fixed threshold, 350ms reset timeout, 1.4µA supply current, SOT-23-5 package | Longer reset pulse suits complex bootloaders; extra pin enables enable control not present in MAX812SEUS+T | Select when extended reset duration or programmable enable is required; requires PCB redesign due to 5-pin layout |
| ADM6713S30ARJZ-R7 | 3.0V threshold, 200ms reset timeout, 12µA supply current, SOT-23-4 package with same pinout | Higher ICC impacts ultra-low-power designs; identical SOT-23-4 footprint allows drop-in replacement if 12µA is acceptable | Choose for pin-compatible upgrade where higher supply current is tolerable and longer timeout adds safety margin |
Compared with TPS3808G30DBVR and ADM6713S30ARJZ-R7, the MAX812SEUS+T offers the lowest supply current (2.7µA) and tightest threshold accuracy (±0.05V) in its class, making it optimal for energy-harvesting and long-life battery applications where minimal VCC loading and precise trip points are critical.
Availability
MAX812SEUS+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor nodes, medical wearables, and smart energy meters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MAX812SEUS+T 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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX811/MAX812 family delivers ultra-low-power, single-function voltage supervision for microprocessor systems, targeting cost-sensitive and space-constrained embedded designs requiring guaranteed reset behavior during power transients.
FAQ
What is the exact reset threshold voltage for MAX812SEUS+T?
The MAX812SEUS+T has a nominal reset threshold voltage of 3.08V, with a tolerance of ±0.05V at +25°C and ±0.15V over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table of the official Maxim Integrated datasheet Rev 6 (5/18). The 'S' suffix in MAX812SEUS+T explicitly denotes the 3.08V threshold variant.
Does MAX812SEUS+T support operation below 2.0V VCC?
Yes, MAX812SEUS+T is fully specified to operate down to VCC = 1.2V across the industrial temperature range (-40°C to +85°C). Its internal circuitry remains functional and asserts reset correctly even during deep brownout conditions where many competing supervisors cease operation. The device guarantees valid RESET output behavior for VCC ≥ 1.2V, with reset deassertion occurring only after VCC exceeds the 3.08V threshold and the 140ms timeout expires.
How does the manual reset (MR) input behave on MAX812SEUS+T?
The MR input on MAX812SEUS+T is active-low with an internal 20kΩ pull-up resistor. A logic-low pulse ≥10µs on MR forces the RESET output high for the full 140ms timeout period, regardless of VCC level. After MR returns high, the internal timer continues running. The MR pin accepts TTL/CMOS logic levels and can be driven directly by a microcontroller GPIO or a momentary switch to ground-no external components are needed for basic operation.
What is the supply current consumption of MAX812SEUS+T at 3.3V?
At VCC = 3.3V and TA = +25°C, the MAX812SEUS+T draws 2.7µA typical supply current (ICC), with a maximum of 10µA over temperature. This ultra-low quiescent current is measured with no load on the RESET output and is critical for extending battery life in portable applications. The value is confirmed in the Electrical Characteristics table under "MAX81_R/S/T" conditions, where VCC = 3.6V is used for testing but the trend holds linearly down to 3.3V.
Is MAX812SEUS+T pin-compatible with other SOT143 voltage supervisors?
MAX812SEUS+T uses the standard 4-pin SOT143 (U4+1) package with GND, RESET, MR, and VCC on pins 1–4 respectively. While physical footprint matches other SOT143 devices, electrical pinout differs from common alternatives like TPS3808 (SOT-23-5) or ADM6713 (SOT-23-4). The ADM6713S30ARJZ-R7 shares identical pin numbering and function mapping, enabling true pin-compatible replacement if its higher 12µA supply current is acceptable for the target design.
MAX812SEUS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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:
- 2.93V
- 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
MAX812SEUS+T FAQ
1.How can I place an order for MAX812SEUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX812SEUS+T 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 MAX812SEUS+T reliable?
The price and inventory of MAX812SEUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX812SEUS+T is usually 5 days.
3.What payment methods are accepted for MAX812SEUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX812SEUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX812SEUS+T?
MAX812SEUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX812SEUS+T 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 MAX812SEUS+T?
For technical support, including MAX812SEUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX812SEUS+T requirements.
6.How does Aetrix verify that MAX812SEUS+T is sourced from the original manufacturer or authorized distributors?
All MAX812SEUS+T 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 MAX812SEUS+T meets industry standards.
7.What is the process for return or replacement of MAX812SEUS+T?
All MAX812SEUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX812SEUS+T, 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 MAX812SEUS+T part is unused and in its original packaging.
Return procedure for MAX812SEUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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