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Analog Devices Inc./Maxim Integrated MAX6326XR31-T
- Part No.:
- MAX6326XR31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6326XR31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6326XR31-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit that monitors 3.08V supply rails and asserts a reset signal for ≥100ms after VCC rises above threshold. It operates from 1.2V to 5.5V, draws ≤1µA supply current at +25°C, and features factory-trimmed reset threshold accuracy of ±1.5% (±2.5%) at room temperature (over temperature), enabling reliable power-on reset in portable and battery-powered systems.
For engineers reviewing the MAX6326XR31-T datasheet, MAX6326XR31-T pinout, MAX6326XR31-T application, or MAX6326XR31-T equivalent, this device serves as a precision voltage monitor with transient immunity, SC70-3 packaging, and compatibility with legacy MAX803/MAX809/MAX810 designs - critical when selecting reset ICs for space-constrained, low-quiescent-current embedded control applications.
Technical Context
The MAX6326XR31-T implements a precision bandgap-based reset comparator with 6.3mV hysteresis and guaranteed correct operation down to VCC = 1.2V. Its internal timing circuit ensures a minimum 100ms reset timeout after power-up, independent of external components.
Designed for immunity to fast VCC transients, it tolerates negative-going glitches up to 200µs at 100mV overdrive and supports bidirectional µP reset interfaces only when paired with open-drain variants - not applicable here, as MAX6326XR31-T uses push-pull output.
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) - sets precise brownout detection point for 3.3V systems. |
| Supply Current | ≤1.0µA max at +25°C - enables multi-year battery life in always-on monitoring applications. |
| Reset Timeout | 100ms minimum power-up delay - ensures stable µP initialization before release. |
| Output Type | Active-low push-pull - drives RESET line directly without external pull-up; sinks 1.6mA at 0.3V. |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during deep brownout and across multiple logic supply domains. |
| Package | 3-pin SC70-3 (X3-2 outline) - 2.0mm × 2.1mm footprint ideal for compact PCB layouts. |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded environments. |
Pinout & Package
MAX6326XR31-T is housed in a 3-pin SC70-3 package (outline X3-2), with 0.65mm pitch and exposed pad not present. Pin 1 is GND, Pin 2 is RESET (active-low push-pull output), and Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection. |
| 2 | RESET | Active-low push-pull output; drives low during reset assertion and high-impedance is not supported - requires no external pull-up. |
| 3 | VCC | Power supply input; accepts 1.2V–5.5V; internally powers reset comparator and output driver. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | ≤1µA max ensures minimal battery drain in always-on supervision - critical for coin-cell-powered IoT sensors. |
| Precision VTH trim | Factory-set 3.08V threshold with ±1.5% tolerance eliminates manual calibration and reduces BOM count. |
| Transient immunity | Rejects VCC glitches <200µs at 100mV overdrive - prevents spurious resets in noisy industrial power rails. |
| No external components | Self-contained reset generation removes need for RC networks or comparators - simplifies layout and validation. |
| Legacy pin compatibility | Pinout matches MAX803/MAX809/MAX810 - allows drop-in replacement without PCB revision in existing designs. |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and brownout protection in DIN-rail mounted programmable logic controllers operating from unregulated 24V DC supplies stepped down to 3.3V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU until 3.3V rail stabilizes post-power-up or during line sag. Use Value: Prevents firmware corruption by guaranteeing ≥100ms reset hold time and rejecting transients induced by relay switching or motor startup. |
Use Scenario: Battery-backed vital signs monitor requiring continuous operation on CR2032 coin cell for >2 years between replacements. IC Role / Device Role / Timing Role: Low-current voltage supervisor monitoring regulated 3.08V supply derived from buck-boost converter feeding ADC and BLE SoC. Use Value: Enables multi-year runtime via 1µA max ICC and precise 3.08V threshold aligned to system's minimum functional voltage. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Tamper-resistant electricity meter with isolated MCU and metrology ASIC powered from auxiliary 3.3V rail. IC Role / Device Role / Timing Role: Reset generator ensuring deterministic boot sequence after cold start or grid interruption. Use Value: Factory-trimmed 3.08V threshold provides consistent trip point across production lots, reducing calibration overhead in high-volume meter manufacturing. |
Use Scenario: Non-safety-critical body controller (e.g., power window module) powered from vehicle battery via LDO. IC Role / Device Role / Timing Role: Brownout detector asserting reset to 8-bit MCU when battery dips below 3.08V during cranking. Use Value: Push-pull output drives MCU reset pin directly without pull-up resistor - saves board space and improves noise margin in EMI-heavy automotive harness environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR31D3-T | Same 3.08V threshold, SOT23-3 package, but higher 2.5µA max ICC and ±2.5% VTH tolerance over temp. | Lacks SC70-3 option; less suitable for ultra-low-power or space-constrained designs. | Select when cost sensitivity outweighs quiescent current or footprint requirements. |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V), 1.8µA max ICC, adjustable delay, but requires external capacitor for timeout tuning. | Not pin-compatible; demands layout change and adds BOM item for timing capacitor. | Choose only if adjustable reset timeout or tighter VTH tolerance (±0.5%) is required - not for direct replacement. |
Compared with MAX809TR31D3-T and TPS3808G33DBVR, the MAX6326XR31-T delivers superior current efficiency (1µA vs. 2.5µA/1.8µA) and exact 3.08V threshold alignment for 3.3V-system brownout margins, while maintaining pin compatibility with legacy Maxim supervisors - making it optimal for retrofitting or new designs prioritizing battery life and layout continuity.
Availability
MAX6326XR31-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, automotive body control modules, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX6326XR31-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, communications, and consumer applications, with expertise in power management and sensor interface solutions.
The MAX6326 family targets ultra-low-power microprocessor supervision in space- and energy-constrained systems, delivering factory-trimmed voltage thresholds, minimal external components, and robust transient immunity for reliable system boot and brownout recovery.
FAQ
What is the exact reset threshold voltage of the MAX6326XR31-T?
The MAX6326XR31-T has a factory-trimmed nominal reset threshold of 3.08V, with guaranteed tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating range. This value is confirmed in Table 1 of the official datasheet and aligns precisely with the "R31" suffix designation. The MAX6326XR31-T uses this threshold to assert reset when VCC falls below 3.08V and hold it for ≥100ms after VCC recovers.
Does the MAX6326XR31-T support open-drain output configuration?
No, the MAX6326XR31-T features an active-low push-pull output, not open-drain. This is defined by its part number prefix "MAX6326", which denotes push-pull RESET functionality per the family selector guide. Open-drain variants are designated MAX6328/MAX6348. The MAX6326XR31-T drives RESET high when inactive and low when asserted, eliminating the need for an external pull-up resistor.
What package type does the MAX6326XR31-T use, and is it RoHS-compliant?
The MAX6326XR31-T uses the 3-pin SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm with 0.65mm lead pitch. Per Maxim's package documentation and ordering information, the "-T" suffix indicates tape-and-reel packaging with lead-free (RoHS-compliant) construction. The device meets JEDEC standards for reflow soldering and is qualified for industrial temperature operation.
Can the MAX6326XR31-T operate reliably below 2.5V supply voltage?
Yes, the MAX6326XR31-T is fully specified to operate from VCC = 1.2V to 5.5V across -40°C to +85°C. Its internal circuitry remains functional and guarantees correct reset state down to 1.2V, enabling use in deep brownout scenarios and with low-voltage regulators. This capability is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables for the MAX6326XR31-T.
Is the MAX6326XR31-T pin-compatible with the MAX809 series?
Yes, the MAX6326XR31-T is pin-compatible with the MAX809 series in SC70-3 and SOT23-3 packages, sharing identical pin 1 (GND), pin 2 (RESET), and pin 3 (VCC) assignments and electrical behavior. This compatibility is documented in the datasheet's "Pin Compatible with MAX803/MAX809/MAX810" feature list and confirmed by matching package outlines and terminal functions - allowing direct substitution in existing MAX809-based designs without PCB changes.
MAX6326XR31-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- SC-70-3
MAX6326XR31-T FAQ
1.How can I place an order for MAX6326XR31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326XR31-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 MAX6326XR31-T reliable?
The price and inventory of MAX6326XR31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326XR31-T is usually 5 days.
3.What payment methods are accepted for MAX6326XR31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326XR31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326XR31-T?
MAX6326XR31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326XR31-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 MAX6326XR31-T?
For technical support, including MAX6326XR31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326XR31-T requirements.
6.How does Aetrix verify that MAX6326XR31-T is sourced from the original manufacturer or authorized distributors?
All MAX6326XR31-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 MAX6326XR31-T meets industry standards.
7.What is the process for return or replacement of MAX6326XR31-T?
All MAX6326XR31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326XR31-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 MAX6326XR31-T part is unused and in its original packaging.
Return procedure for MAX6326XR31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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