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Analog Devices Inc./Maxim Integrated MAX6326UR26+T
- Part No.:
- MAX6326UR26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,569
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Product details
Overview
MAX6326UR26+T from Maxim Integrated is a precision ultra-low-power microprocessor supervisory circuit in SOT23-3 package, designed to monitor 2.5V–5V power supplies and assert an active-low push-pull reset signal when VCC falls below 2.63V (±2.5% over temperature), with ≥100ms reset timeout after recovery. It draws ≤1µA supply current at 3V and operates from -40°C to +85°C, enabling reliable power-on/brownout reset in portable and industrial µP systems.
For engineers reviewing the MAX6326UR26+T datasheet, MAX6326UR26+T pinout, MAX6326UR26+T application, or MAX6326UR26+T equivalent, this device serves as a drop-in replacement for MAX809/MAX810 in space-constrained designs requiring factory-trimmed 2.63V threshold, transient-immune reset assertion, and guaranteed reset state down to 1.2V VCC.
Technical Context
The MAX6326UR26+T implements a precision bandgap-based voltage comparator with 40ppm/°C tempco and 6.3mV hysteresis to detect VCC drops below its factory-set 2.63V threshold. Its internal reset timer guarantees ≥100ms (min) active-low reset pulse width after VCC rises above threshold, independent of supply ramp rate.
It features open-circuit immunity to fast VCC transients (up to 100V/µs), operates with no external components, and maintains valid reset output state across full -40°C to +85°C range - all while consuming only 0.5–1.0µA typical supply current at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 2.5V/3.3V systems without recalibration. |
| Supply Current | ≤1.0µA max at 3V - enables multi-year battery life in portable equipment and always-on monitoring nodes. |
| Reset Timeout | 100ms to 280ms min–max - satisfies µP power-on initialization timing requirements across voltage and temperature. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with wide-input µP platforms. |
| Output Type | Active-low push-pull - drives reset line directly without pull-up resistor, reducing BOM count and board area. |
| Transient Immunity | Immune to VCC glitches <100V/µs - prevents false resets during switching noise or ESD events. |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
MAX6326UR26+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 stable reset timing. |
| 2 (RESET) | Active-low push-pull output | Drives µP RESET pin low during fault; actively pulls high when deasserted - eliminates need for external pull-up. |
| 3 (VCC) | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year coin-cell operation in IoT sensors and wearables. |
| Precision VTH | 2.63V ±2.5% over full temperature range eliminates calibration overhead in production test. |
| No external components | Reduces bill-of-materials cost and layout complexity versus discrete reset solutions. |
| Guaranteed reset state down to 1.2V | Ensures deterministic behavior during deep undervoltage conditions before complete power loss. |
| Push-pull output | Provides strong drive capability (1.6mA sink) and eliminates pull-up resistor placement constraints. |
Applications
| Industrial PLC Controllers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Power sequencing and brownout protection in DIN-rail mounted programmable logic controllers operating on 24VDC-derived 3.3V rails. IC Role / Device Role / Timing Role: Supervisory circuit asserting hardware reset to ARM Cortex-M7 µP during AC line sags or DC-DC converter faults. Use Value: Prevents firmware corruption by guaranteeing ≥100ms reset hold time even under 1.2V residual VCC, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Battery-powered glucose monitors and pulse oximeters requiring multi-year shelf life and instant-on reliability. IC Role / Device Role / Timing Role: Power-on reset generator and low-VCC detector tied to lithium coin cell (CR2032) and LDO output. Use Value: 1µA max supply current extends usable battery life beyond 5 years; 2.63V threshold matches nominal 3.0V LDO output with margin. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Reset supervision for microcontrollers in door module ECUs exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 5V system rail derived from automotive 12V battery; asserts reset during cranking-induced brownouts. Use Value: Immunity to 100V/µs VCC transients prevents spurious resets during alternator load dump; -40°C to +85°C rating meets AEC-Q100 Grade 3. |
Use Scenario: Tamper-resistant electricity meter with real-time clock and secure MCU requiring fail-safe boot sequence. IC Role / Device Role / Timing Role: Primary reset source for dual-core metering SoC, ensuring deterministic startup after power restoration. Use Value: Factory-trimmed 2.63V threshold aligns with 2.5V RTC backup supply; 6.3mV hysteresis prevents chatter near threshold during slow VCC recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 2.63V threshold, same SOT23-3 package, but 3.5µA max ICC and no guaranteed operation below 1.8V VCC. | Limited to higher-VCC systems; unsuitable for deep-brownout detection in battery-backed designs. | Select MAX6326UR26+T when sub-1.8V reset validity or ultra-low ICC is required. |
| TPS3123E18DBVR | 2.63V threshold, SOT23-3, but open-drain output requiring external pull-up and 2.5µA ICC. | Requires additional resistor and PCB trace; less robust against noise on reset line than push-pull. | Choose MAX6326UR26+T for simplified layout, lower EMI, and guaranteed 1.2V operation. |
Compared with MAX809TRD2+T and TPS3123E18DBVR, the MAX6326UR26+T delivers superior brownout resilience (1.2V VCC min), lowest ICC (1µA), and integrated push-pull drive - making it optimal for long-life, space-constrained, and low-voltage µP supervision.
Availability
MAX6326UR26+T is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6326UR26+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 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, single-chip reset generation in battery-powered and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6326UR26+T and how does it vary with temperature?
The MAX6326UR26+T has a factory-trimmed nominal reset threshold of 2.63V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in a maximum deviation of approximately ±13mV across the temperature range - sufficient for stable operation in 2.5V and 3.3V systems without external calibration.
Does MAX6326UR26+T require any external components to function?
No, the MAX6326UR26+T requires zero external components. Its precision voltage reference, comparator, timer, and push-pull output driver are fully integrated. Unlike open-drain reset supervisors, it needs no pull-up resistor on the RESET pin - simplifying layout and reducing BOM cost while improving noise immunity.
Can MAX6326UR26+T operate reliably during severe power supply brownouts?
Yes, the MAX6326UR26+T is guaranteed to maintain correct reset state down to VCC = 1.2V over -40°C to +85°C, and its internal circuitry remains functional even as VCC declines below the 2.63V threshold. This ensures deterministic reset assertion and hold timing during deep brownouts where competing supervisors may lose regulation or timing accuracy.
What is the minimum reset pulse width guaranteed by MAX6326UR26+T?
The MAX6326UR26+T guarantees a minimum reset pulse width of 100ms after VCC rises above the 2.63V threshold. The actual timeout ranges from 100ms to 280ms depending on process and temperature, satisfying the power-on reset timing requirements of most ARM Cortex-M, PIC, and 8051 microcontrollers without external timing components.
Is MAX6326UR26+T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, the MAX6326UR26+T uses the identical SOT23-3 pinout (GND–RESET–VCC) and electrical interface as MAX809/MAX810, including push-pull active-low output and compatible voltage thresholds. It is a direct drop-in replacement offering improved specs: lower ICC (1µA vs. 3.5µA), wider VCC range (1.2V–5.5V), and better temperature stability.
MAX6326UR26+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:
- 2.63V
- 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
MAX6326UR26+T FAQ
1.How can I place an order for MAX6326UR26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR26+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 MAX6326UR26+T reliable?
The price and inventory of MAX6326UR26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR26+T is usually 5 days.
3.What payment methods are accepted for MAX6326UR26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR26+T?
MAX6326UR26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR26+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 MAX6326UR26+T?
For technical support, including MAX6326UR26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR26+T requirements.
6.How does Aetrix verify that MAX6326UR26+T is sourced from the original manufacturer or authorized distributors?
All MAX6326UR26+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 MAX6326UR26+T meets industry standards.
7.What is the process for return or replacement of MAX6326UR26+T?
All MAX6326UR26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR26+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 MAX6326UR26+T part is unused and in its original packaging.
Return procedure for MAX6326UR26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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