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Analog Devices Inc./Maxim Integrated MAX6803US44D3+T
- Part No.:
- MAX6803US44D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US44D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
MAX6803US44D3+T from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in 4-pin SOT143 package, monitoring 4.38V ±3% VCC supply with 100ms minimum reset timeout, ultra-low 4µA supply current, and guaranteed operation down to 0.7V VCC. It asserts RESET high during power-up, brownout, or manual reset for reliable µP initialization in battery-powered instrumentation.
For engineers reviewing the MAX6803US44D3+T datasheet, MAX6803US44D3+T pinout, MAX6803US44D3+T application, or MAX6803US44D3+T equivalent, key selection criteria include its factory-trimmed 4.38V threshold, 100ms reset timeout, active-high push/pull output, -40°C to +125°C operation, and compatibility with space-constrained µP systems requiring deterministic reset assertion without external components.
Technical Context
The MAX6803US44D3+T implements a precision bandgap-based voltage comparator with factory-trimmed 4.38V reset threshold (±1.8% at +25°C, ±3% over full temperature range) and internal 20kΩ MR pullup. Its reset logic guarantees valid RESET output down to VCC = 0.7V, with 30µs propagation delay on VCC falling edge at 10V/ms.
It features a debounced manual-reset input (MR), 1µs minimum MR pulse width, 50ns MR glitch immunity, and 0.1µs MR reset delay. The push/pull RESET output sources up to 800µA at VCC ≥ 4.25V while asserted, and sinks up to 3.2mA while deasserted, maintaining VOH ≥ 0.8×VCC and VOL ≤ 0.4V across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% over -40°C to +125°C - ensures stable brownout detection for 4.5V nominal supplies |
| Reset Timeout | 100ms minimum - provides sufficient hold time for slow-ramping µP clocks and memory initialization |
| Supply Current | 4µA typical at VCC = 3.0V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 0.7V to 5.5V - supports valid reset assertion during deep brownout and cold-start conditions |
| Output Type | Active-high push/pull - eliminates need for external pullup and interfaces directly with CMOS µP reset inputs |
| MR Input | Internal 20kΩ pullup - allows momentary switch-to-GND implementation without external components |
| Package | 4-pin SOT143 - 1.3mm × 2.1mm footprint ideal for compact PCB layouts |
Pinout & Package
MAX6803US44D3+T is housed in a 4-pin SOT143 package (outline 21-0052, land pattern 90-0183), measuring 1.3mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage |
| 2 | RESET | Active-high push/pull output - drives high during reset assertion; no external pullup required |
| 3 | MR | Manual-reset input - logic low asserts reset; internally pulled up to VCC via 20kΩ resistor |
| 4 | VCC | Power supply input - monitored for brownout; powers internal circuitry down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.38V threshold | Eliminates external resistor network and calibration effort for 4.5V system rails |
| 100ms minimum reset timeout | Guarantees µP core and peripherals remain held in reset until stable clock and supply conditions are achieved |
| 0.7V minimum operating voltage | Ensures deterministic reset behavior during deep undervoltage events where most µPs cease operation |
| Debounced MR input with 20kΩ pullup | Supports direct connection of mechanical switches without RC filters or firmware debounce overhead |
| 4µA supply current at 3V | Reduces quiescent power in always-on monitoring circuits, critical for coin-cell–powered devices |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Long-term environmental sensor nodes powered by CR2032 batteries must retain accurate timestamping and fault recovery across 5+ year deployments. IC Role / Device Role / Timing Role: MAX6803US44D3+T monitors 4.5V regulated rail and asserts active-high RESET to ARM Cortex-M0 during battery sag below 4.38V, ensuring clean boot after voltage recovery. Use Value: 4µA supply current extends battery life; 100ms timeout prevents spurious resets from transient load spikes; 0.7V operation guarantees reset validity even as battery decays to 2.0V open-circuit. | Use Scenario: DIN-rail mounted I/O modules operate in harsh industrial environments with wide ambient temperature swings (-40°C to +85°C) and noisy 24VDC supplies. IC Role / Device Role / Timing Role: MAX6803US44D3+T supervises the 5V local regulator feeding the µP and FPGA, asserting RESET high during 24V input dips that cause downstream rail collapse. Use Value: ±3% threshold tolerance over full temperature range ensures consistent trip point; SOT143 package withstands thermal cycling; push/pull output drives heavy capacitive loads on reset bus without signal degradation. |
| Medical Point-of-Care Analyzers | Automotive Body Control Modules |
Use Scenario: Portable blood glucose meters require fail-safe startup after battery insertion or low-power wake-from-sleep to prevent corrupted measurement sequences. IC Role / Device Role / Timing Role: MAX6803US44D3+T provides power-on reset and manual reset via tactile button, holding the MSP430F5xx in reset until 4.38V rail stabilizes and ADC reference settles. Use Value: Debounced MR input eliminates firmware-level switch handling; 100ms timeout accommodates slow analog reference settling; 4-pin SOT143 saves board area in handheld enclosure. | Use Scenario: BCMs manage door locks, lighting, and diagnostics using 5V supplies derived from vehicle battery (9V–16V), subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: MAX6803US44D3+T monitors the post-regulator 5V rail, asserting RESET high during cranking-induced brownouts (<6V battery) to prevent µP corruption. Use Value: Immunity to 30µs VCC transients avoids false resets; guaranteed operation to 0.7V ensures reset remains valid during extreme cranking; -40°C to +125°C rating matches under-hood requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US44D3+T | Same 4.38V threshold, 100ms timeout, push/pull active-high output, but higher 15µA supply current and 1.0V minimum VCC | Lacks guaranteed reset validity below 1.0V - unsuitable for deep-brownout recovery scenarios | Select MAX6803US44D3+T when sub-1.0V operation or ultra-low quiescent current is required |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, active-low open-drain output, 1.5µA supply current, 0.8V min VCC | Requires external pullup; incompatible pinout and active-low signaling - necessitates µP reset input redesign | Choose MAX6803US44D3+T for drop-in replacement in existing 4.38V push/pull designs without layout changes |
Compared with MAX6314US44D3+T and TPS3808G33DBVR, the MAX6803US44D3+T uniquely combines 4.38V precision threshold, 100ms timeout, active-high push/pull drive, and 0.7V operational floor - making it optimal for legacy-compatible, ultra-low-power brownout supervision in 4.5V systems.
Availability
MAX6803US44D3+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control modules, medical analyzers, and automotive body electronics requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6803US44D3+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 consumer applications.
The MAX6803 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-monitoring and reset generation in space-constrained, low-power µP systems operating across extended temperature ranges.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6803US44D3+T?
The MAX6803US44D3+T has a factory-trimmed reset threshold of 4.38V, specified with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating temperature range. This precise threshold ensures reliable brownout detection for systems powered by nominal 4.5V supplies, and is confirmed in Table 1 of the official datasheet under suffix "44". The MAX6803US44D3+T uses this exact threshold value without user adjustment.
Does MAX6803US44D3+T support active-high or active-low reset output?
The MAX6803US44D3+T features an active-high, push/pull RESET output - meaning it drives the RESET pin high during reset assertion and actively pulls it low when deasserted. This eliminates the need for an external pullup resistor and provides direct compatibility with µP reset inputs expecting high-active signaling. Unlike the MAX6804 (active-low push/pull) or MAX6805 (active-low open-drain), the MAX6803US44D3+T is specifically designed for active-high applications.
What is the minimum reset timeout period for MAX6803US44D3+T?
The MAX6803US44D3+T has a minimum reset timeout period of 100ms, corresponding to the "D3" suffix in its part number. This timeout begins when VCC rises above the 4.38V threshold or when the manual reset (MR) input is released, and ensures the microprocessor remains held in reset long enough for power rails and clocks to stabilize. Typical and maximum values are 150ms and 200ms respectively, per the Electrical Characteristics table.
Can MAX6803US44D3+T operate reliably at very low supply voltages?
Yes, the MAX6803US44D3+T is guaranteed to maintain correct reset state down to VCC = 0.7V, and operates across a full supply range of 0.7V to 5.5V. This capability ensures deterministic reset assertion during deep brownout conditions where other supervisors may fail, and is explicitly validated for the MAX6803/MAX6804 family (not MAX6805). The MAX6803US44D3+T leverages this feature to provide fail-safe behavior in battery-depleted or cold-cranking scenarios.
What package type and footprint does MAX6803US44D3+T use?
The MAX6803US44D3+T is packaged in a 4-pin SOT143 (also referenced as U4-1), with dimensions of 1.3mm × 2.1mm × 0.95mm and gull-wing surface-mount leads. Its land pattern is documented as 90-0183, and the package outline is 21-0052. This compact, RoHS-compliant lead-free package supports high-density PCB layouts and is compatible with standard reflow soldering processes. The "+T" suffix confirms lead-free termination per the ordering information.
MAX6803US44D3+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:
- 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:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6803US44D3+T FAQ
1.How can I place an order for MAX6803US44D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US44D3+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 MAX6803US44D3+T reliable?
The price and inventory of MAX6803US44D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US44D3+T is usually 5 days.
3.What payment methods are accepted for MAX6803US44D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US44D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6803US44D3+T?
MAX6803US44D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US44D3+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 MAX6803US44D3+T?
For technical support, including MAX6803US44D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US44D3+T requirements.
6.How does Aetrix verify that MAX6803US44D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6803US44D3+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 MAX6803US44D3+T meets industry standards.
7.What is the process for return or replacement of MAX6803US44D3+T?
All MAX6803US44D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US44D3+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 MAX6803US44D3+T part is unused and in its original packaging.
Return procedure for MAX6803US44D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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