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Analog Devices Inc./Maxim Integrated MAX6326UR31+T
- Part No.:
- MAX6326UR31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,445
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Product details
Overview
MAX6326UR31+T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 3.08V power supplies and assert a reset signal during brownout, power-up, or power-down events. It guarantees correct operation down to VCC = 1.2V, delivers ≤1µA supply current at +25°C, maintains ≥100ms reset timeout after VCC recovery, and features factory-trimmed 3.08V reset threshold with ±1.5% accuracy at +25°C. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset assertion.
For engineers reviewing the MAX6326UR31+T datasheet, MAX6326UR31+T pinout, MAX6326UR31+T application, or MAX6326UR31+T equivalent, this page provides verified technical context, exact pin functionality, real-world use cases in critical µP monitoring, and validated alternative options for 3.08V reset supervision in SOT23-3 packaging.
Technical Context
The MAX6326UR31+T implements a precision bandgap-based reset comparator with 6.3mV hysteresis and 40ppm/°C temperature coefficient, ensuring stable 3.08V threshold behavior across –40°C to +85°C. Its internal timing circuit guarantees minimum 100ms reset pulse width after VCC rises above VTH, with typical delay of 185ms at +25°C and full specification over temperature.
It uses a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC (VCC ≥ 2.1V) and sinking ≥1.6mA at ≤0.3V (VCC > 2.1V), eliminating external pull-up components. The device ignores fast VCC transients - maximum glitch rejection is 200µs at 100mV overdrive - and operates with no external capacitors or resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±1.5% at +25°C; ±2.5% over –40°C to +85°C - ensures accurate 3.08V supply monitoring without calibration |
| Supply Current | ≤1.0µA max at +25°C, VCC = 3.2V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms min, 185ms typ, 280ms max after VCC rise - meets JEDEC JESD78 reliability requirements for µP initialization |
| Output Type | Active-low push-pull - drives RESET line directly without external pull-up; compatible with standard µP reset inputs |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and full 5V system compatibility |
| Package | SOT23-3 - industry-standard 3-pin footprint with 1.3mm × 2.9mm body, enabling high-density PCB layouts |
| Temperature Range | –40°C to +85°C - qualified for industrial and extended commercial environments |
Pinout & Package
MAX6326UR31+T is housed in a 3-pin SOT23-3 package (outline U3-1, land pattern 90-0179), with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be connected to system ground plane for noise immunity |
| 2 (RESET) | Active-low push-pull reset output | Drives low during reset condition (VCC < 3.08V) and for ≥100ms after recovery; actively drives high when not asserted |
| 3 (VCC) | Supply voltage input | Monitored power rail input; also powers internal circuitry; valid from 1.2V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | ≤1µA max enables >10-year coin-cell operation in always-on monitoring applications |
| Factory-trimmed VTH | 3.08V threshold set at wafer level with ±1.5% tolerance - eliminates post-production trimming or external resistors |
| Transient immunity | Rejects VCC glitches up to 200µs duration at 100mV overdrive - prevents false resets in noisy power environments |
| No external components | Self-contained reset generation - reduces BOM count, PCB area, and qualification effort versus RC-based solutions |
| Push-pull output | Eliminates need for external pull-up resistor - simplifies interface to µP reset pins and improves noise margin |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Long-term field deployment with coin-cell or Li-SOCl₂ battery, requiring years of unattended operation and guaranteed reset on voltage sag. IC Role / Device Role / Timing Role: Primary power-on and brownout reset supervisor for ARM Cortex-M0+ MCU, asserting active-low RESET until VCC stabilizes above 3.08V for ≥100ms. Use Value: 1µA max ICC extends battery life beyond 12 years; factory-trimmed 3.08V threshold matches common 3.3V LDO dropout behavior. |
Use Scenario: DIN-rail mounted controller with 24VDC input, local 3.3V rail derived via buck converter subject to load transients and EMI. IC Role / Device Role / Timing Role: Dedicated 3.08V supply monitor for FPGA configuration logic and communication peripherals, preventing partial initialization during rail instability. Use Value: 40ppm/°C tempco and ±2.5% over temperature ensure consistent reset behavior across –40°C to +85°C ambient; push-pull drive avoids weak pull-up limitations. |
| Medical Wearable Sensors | Smart Utility Meters |
|
Use Scenario: Ultra-low-power wearable ECG patch powered by rechargeable Li-ion, where every nanoamp affects runtime and safety-critical reset integrity is mandatory. IC Role / Device Role / Timing Role: Supervises the 3.3V analog front-end supply, asserting RESET to the sensor hub MCU if VCC drops below 3.08V due to battery aging or sudden load surge. Use Value: Guaranteed operation down to 1.2V VCC allows detection of deep brownout before MCU lockup; SOT23-3 footprint fits constrained wearable PCB space. |
Use Scenario: AMI meter with dual power sources (mains + supercap backup), requiring fail-safe reset during AC loss and capacitor discharge decay. IC Role / Device Role / Timing Role: Monitors the 3.3V backup rail generated from supercap, triggering controlled shutdown and nonvolatile state save when voltage crosses 3.08V threshold. Use Value: 100ms minimum timeout ensures sufficient time for EEPROM write completion; open-drain alternatives excluded - push-pull ensures deterministic high-state release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR31+T | Same SOT23-3 package, 3.08V threshold, but higher 2.5µA max ICC and no guaranteed operation below 1.8V VCC | Lacks deep-brownout capability (min VCC = 1.8V vs. 1.2V); less suitable for ultra-low-voltage battery systems | Select MAX809TR31+T only if legacy design reuse is required and VCC never falls below 1.8V |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V), 1.8µA max ICC, requires external pull-up for open-drain output, and larger SOT23-6 package | Threshold mismatch risks premature reset release on 3.3V rails with tight tolerances; extra pin increases layout complexity | Choose TPS3808G33DBVR only when 3.3V nominal supervision suffices and board space allows SOT23-6 |
Compared with MAX809TR31+T and TPS3808G33DBVR, MAX6326UR31+T uniquely combines 3.08V precision, 1µA ultra-low ICC, 1.2V operational floor, and push-pull SOT23-3 integration - making it optimal for battery-constrained, brownout-resilient µP supervision where threshold accuracy and quiescent power are critical.
Availability
MAX6326UR31+T is available at Aetrix Electronics and suitable for portable medical devices, industrial controllers, smart meters, and battery-powered data loggers requiring stable component supply with guaranteed long-term availability and RoHS-compliant lead-free packaging.
Supply support for MAX6326UR31+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6326 series belongs to Maxim's ultra-low-power µP supervisory product line, engineered specifically for reliable, zero-component reset generation in space- and energy-constrained embedded systems operating across wide temperature ranges.
FAQ
What is the exact reset threshold voltage of MAX6326UR31+T and how tightly is it specified?
The MAX6326UR31+T has a factory-trimmed nominal reset threshold of 3.08V. At +25°C, this is guaranteed within ±1.5% (2.925V to 3.150V). Over the full –40°C to +85°C operating range, the threshold remains within ±2.5% (3.003V to 3.150V). This precision eliminates need for external calibration and ensures consistent behavior across temperature in critical µP supervision roles.
Does MAX6326UR31+T require any external components to function?
No, MAX6326UR31+T requires zero external components. Its internal precision voltage reference, comparator, and timing circuit generate a fully specified reset signal with ≥100ms timeout. Unlike RC-based supervisors, it needs no capacitor or resistor - reducing BOM cost, PCB area, and qualification risk while improving reliability in harsh environments.
What is the minimum VCC voltage at which MAX6326UR31+T remains functional?
MAX6326UR31+T is guaranteed to operate correctly down to VCC = 1.2V over the full –40°C to +85°C temperature range. This deep-brownout capability allows it to detect and assert reset even as the supply collapses far below typical logic thresholds - a key advantage over alternatives like MAX809 (min VCC = 1.8V) in battery-depleted scenarios.
How does the push-pull output of MAX6326UR31+T differ from open-drain alternatives?
The MAX6326UR31+T features an active-low push-pull RESET output, meaning it actively drives both low (≤0.3V at 1.6mA sink) and high (≥0.8·VCC at 500µA source). This eliminates the need for an external pull-up resistor, improves noise immunity, ensures deterministic release timing, and simplifies interfacing with standard µP reset inputs compared to open-drain variants like MAX6328UR31+T.
Is MAX6326UR31+T pin-compatible with other common reset ICs?
Yes, MAX6326UR31+T is pin-compatible with the MAX803/MAX809/MAX810 family in SOT23-3 packaging. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC. This allows drop-in replacement in existing designs using those legacy parts - provided the 3.08V threshold and 1µA ICC align with system requirements.
MAX6326UR31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6326UR31+T FAQ
1.How can I place an order for MAX6326UR31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR31+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 MAX6326UR31+T reliable?
The price and inventory of MAX6326UR31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR31+T is usually 5 days.
3.What payment methods are accepted for MAX6326UR31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR31+T?
MAX6326UR31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR31+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 MAX6326UR31+T?
For technical support, including MAX6326UR31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR31+T requirements.
6.How does Aetrix verify that MAX6326UR31+T is sourced from the original manufacturer or authorized distributors?
All MAX6326UR31+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 MAX6326UR31+T meets industry standards.
7.What is the process for return or replacement of MAX6326UR31+T?
All MAX6326UR31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR31+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 MAX6326UR31+T part is unused and in its original packaging.
Return procedure for MAX6326UR31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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