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Analog Devices Inc./Maxim Integrated MAX6803US26D3+T
- Part No.:
- MAX6803US26D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US26D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
The MAX6803US26D3+T from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in SOT143 package, monitoring VCC from 2.85V to 5.0V with factory-trimmed 2.63V reset threshold and 100ms minimum reset timeout. It asserts RESET high during power brownout or manual reset, guarantees valid output down to VCC = 0.7V, and draws only 4µA supply current at 3.0V - ideal for battery-powered instrumentation and embedded controllers.
For engineers reviewing the MAX6803US26D3+T datasheet, MAX6803US26D3+T pinout, MAX6803US26D3+T application, or MAX6803US26D3+T equivalent, key selection considerations include its active-high push/pull RESET output, 2.63V precise threshold tolerance (±1.8% at +25°C), 100ms reset timeout, ultra-low operating voltage capability (0.7V min), and guaranteed reset assertion validity over full -40°C to +125°C industrial temperature range.
Technical Context
This device implements a precision bandgap-based reset comparator with factory-trimmed 2.63V threshold and ±3% variation over -40°C to +125°C. Its internal 20kΩ MR pullup eliminates external components, and reset propagation delay is under 30µs for VCC falling at 10V/ms.
The push/pull output stage sources up to 800µA at VCC ≥ 4.25V while maintaining VOH ≥ 0.8 × VCC, and sinks up to 3.2mA with VOL ≤ 0.4V - enabling direct interface to CMOS inputs without external pullups. Reset remains asserted for ≥100ms after VCC recovery or MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.8% at +25°C; ensures reliable brownout detection for 2.85V–5.0V systems |
| Reset Timeout | 100ms minimum; holds µP in reset long enough for stable power rail recovery |
| Supply Voltage Range | 0.7V to 5.5V; enables operation during deep brownout and supports wide-input systems |
| Supply Current | 4µA at VCC = 3.0V; minimizes battery drain in portable equipment |
| Operating Temperature | -40°C to +125°C; qualified for industrial and automotive under-hood environments |
| Output Type | Active-high push/pull RESET; eliminates need for external pullup resistor |
| VCC Transient Immunity | Rejects <30µs negative transients at 10V/ms; prevents false resets from noise |
Pinout & Package
MAX6803US26D3+T is housed in a 4-pin SOT143 package (U4-1 outline, 21-0052), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 - RESET | Active-high push/pull reset output | Drives high during fault conditions; directly interfaces to µP reset input without external components |
| 3 - MR | Manual-reset input | Logic-low assertion triggers reset; internal 20kΩ pullup allows floating if unused |
| 4 - VCC | Power supply input | Monitored rail; powers internal circuitry and determines reset assertion timing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.63V threshold | Eliminates external resistor divider; achieves ±1.8% accuracy at +25°C without calibration |
| 100ms minimum reset timeout | Ensures µP completes power-up initialization before release, even with slow-rising rails |
| 0.7V minimum operating voltage | Maintains valid RESET assertion during severe brownout, supporting fail-safe shutdown |
| Debounced MR input | Internal filtering rejects <1µs glitches; enables direct switch connection without RC network |
| Push/pull active-high output | Drives high to µP reset pin; avoids contention with other open-drain reset sources |
Applications
| Industrial Controllers | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: PLC I/O modules operating in harsh factory environments with fluctuating 3.3V/5V supplies. IC Role / Device Role / Timing Role: Monitors main VCC rail and asserts active-high RESET to ARM Cortex-M4 controller during brownout. Use Value: Prevents firmware corruption by holding processor in reset until 3.3V rail stabilizes above 2.63V for ≥100ms. |
Use Scenario: Handheld multimeter powered by two AA cells (1.8V–3.2V range). IC Role / Device Role / Timing Role: Supervises declining battery voltage and triggers controlled shutdown via µP reset. Use Value: Enables graceful state save before power loss, leveraging 0.7V operation to detect end-of-life battery sag. |
| Medical Diagnostic Sensors | Automotive Body Control Modules |
|
Use Scenario: Portable ECG monitor requiring FDA-compliant power-on self-test and fault-safe reset. IC Role / Device Role / Timing Role: Generates deterministic 100ms reset pulse on power-up and manual test initiation. Use Value: Meets IEC 62304 Class B requirements for predictable reset behavior across -20°C to +70°C operating range. |
Use Scenario: Door module with LIN bus interface and 5V supply derived from vehicle battery. IC Role / Device Role / Timing Role: Detects battery dips below 2.63V during cranking and asserts RESET to prevent erratic MCU behavior. Use Value: Guarantees reset validity down to 0.7V VCC, ensuring safe operation during cold-cranking transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US26D3+T | Same 2.63V threshold and 100ms timeout, but uses different BiCMOS process; ICC = 5µA at 5V vs. 4µA for MAX6803US26D3+T | Identical pinout and function; slightly higher supply current limits use in ultra-low-power designs | Select when legacy qualification or alternate sourcing is required; identical thermal and timing behavior |
| TPS3808G26DBVR | 2.63V threshold with 200ms timeout (not 100ms); active-low open-drain output; requires external pullup | Not pin-compatible; needs layout change for RESET polarity and pullup; wider supply range (0.8V–6.0V) | Choose for systems needing longer reset hold time or compatibility with TI-designated BOMs |
Compared with MAX6803US26D3+T, MAX6315US26D3+T offers identical functionality with marginally higher quiescent current, while TPS3808G26DBVR provides extended timeout and broader VCC range but requires redesign for active-low signaling and external biasing.
Availability
MAX6803US26D3+T is available at Aetrix Electronics and suitable for industrial controllers, battery-powered test equipment, medical diagnostic sensors, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for MAX6803US26D3+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 and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on reliability, low power, and integration.
The MAX6803 series targets space-constrained µP supervision in harsh environments, delivering factory-trimmed thresholds, ultra-low voltage operation, and robust transient immunity without external components.
FAQ
What is the exact reset threshold voltage of MAX6803US26D3+T and how tightly is it specified?
The MAX6803US26D3+T has a factory-trimmed reset threshold of 2.63V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C temperature range. This precision eliminates need for external calibration and ensures consistent brownout detection across operating conditions. The MAX6803US26D3+T maintains this specification without external components.
Does MAX6803US26D3+T support operation at very low supply voltages, and what is the minimum functional VCC?
Yes, MAX6803US26D3+T is guaranteed to assert valid RESET down to VCC = 0.7V, and operates over 0.7V to 5.5V. At VCC = 0.78V (minimum at -40°C to +125°C), the device still correctly monitors and asserts RESET high. This makes MAX6803US26D3+T suitable for deep-brownout detection in battery-powered systems nearing end-of-life.
What is the reset timeout duration for MAX6803US26D3+T, and is it guaranteed over temperature?
The MAX6803US26D3+T provides a minimum reset timeout of 100ms after VCC rises above 2.63V or after MR is deasserted. This is specified as 100ms (min), 150ms (typ), and 200ms (max) over -40°C to +125°C, with normalized variation <±15% across temperature. The timeout is internally generated and does not require external capacitors - a key feature of MAX6803US26D3+T.
How does the manual-reset (MR) input of MAX6803US26D3+T behave, and does it require external components?
The MR input of MAX6803US26D3+T features an internal 20kΩ pullup resistor and debounced logic, allowing direct connection of a momentary switch to GND without external RC networks. A logic-low pulse ≥1µs asserts RESET, which remains active for the full 100ms timeout after MR returns high. No external components are needed - a defining characteristic of MAX6803US26D3+T.
What output configuration does MAX6803US26D3+T use, and how does it interface to common microcontrollers?
MAX6803US26D3+T uses an active-high push/pull RESET output, sourcing up to 800µA while maintaining VOH ≥ 0.8 × VCC. This allows direct connection to standard CMOS µP reset inputs (e.g., STM32, PIC, MSP430) without pullup resistors or level shifters. Unlike open-drain alternatives, MAX6803US26D3+T avoids contention in multi-source reset architectures.
MAX6803US26D3+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:
- 2.63V
- 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
MAX6803US26D3+T FAQ
1.How can I place an order for MAX6803US26D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US26D3+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 MAX6803US26D3+T reliable?
The price and inventory of MAX6803US26D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US26D3+T is usually 5 days.
3.What payment methods are accepted for MAX6803US26D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US26D3+T transactions.
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4.How is shipping managed for MAX6803US26D3+T?
MAX6803US26D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US26D3+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 MAX6803US26D3+T?
For technical support, including MAX6803US26D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US26D3+T requirements.
6.How does Aetrix verify that MAX6803US26D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6803US26D3+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 MAX6803US26D3+T meets industry standards.
7.What is the process for return or replacement of MAX6803US26D3+T?
All MAX6803US26D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US26D3+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 MAX6803US26D3+T part is unused and in its original packaging.
Return procedure for MAX6803US26D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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