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Analog Devices Inc./Maxim Integrated MAX6348UR40-T
- Part No.:
- MAX6348UR40-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR40-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,202
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Product details
Overview
MAX6348UR40-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.0V power supplies in embedded systems. It asserts reset when VCC falls below 4.00V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, draws ≤1µA supply current at 3V, operates from 1.2V to 5.5V, and is housed in a 3-pin SOT23 package for space-constrained applications such as portable instrumentation.
For engineers reviewing the MAX6348UR40-T datasheet, MAX6348UR40-T pinout, MAX6348UR40-T application, or MAX6348UR40-T equivalent, key selection criteria include its factory-trimmed 4.0V reset threshold, open-drain output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), immunity to fast VCC transients, guaranteed operation down to 1V supply, and SOT23-3 footprint compatibility with legacy MAX809/MAX810 designs.
Technical Context
The MAX6348UR40-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 9.5mV hysteresis, ensuring stable threshold behavior across -40°C to +85°C. Its open-drain RESET output requires an external pull-up and supports bidirectional reset arbitration in µP systems.
It features transient immunity: negative-going VCC glitches ≤100mV overdrive are tolerated up to ~150µs at room temperature, per the Maximum Transient Duration vs. Reset Threshold Overdrive curve. Power-on reset timeout is guaranteed ≥100ms and extends to 280ms maximum over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.000V ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 4.0V nominal rails |
| Supply Current | ≤1.0µA max at 3V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms to 280ms - guarantees sufficient initialization time for slow-starting µPs and peripherals |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and direct interface with bidirectional µP reset pins |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with diverse logic families |
| Reset Hysteresis | 9.5mV - prevents chatter near threshold during noisy or slowly recovering supply conditions |
| Leakage Current | ≤0.1µA on RESET - minimizes pull-up resistor power loss in always-on monitoring circuits |
Pinout & Package
MAX6348UR40-T is packaged in a 3-pin SOT23-3 (U3-1) surface-mount package with 0.95mm pitch, compatible with standard reflow profiles and IPC-7351 land pattern 90-0179.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Open-drain active-low reset output | Sinks current when asserted; requires external pull-up to VCC or another rail; enables shared reset bus with other open-drain devices |
| 3 (VCC) | Supply input | Monitored voltage source; powers internal circuitry; valid from 1.2V to 5.5V; tolerates transients per Absolute Maximum Ratings |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA max enables >10-year battery life in coin-cell-powered IoT sensors and handheld instruments |
| Factory-trimmed precision threshold | 4.000V ±2.5% eliminates need for external resistive divider or calibration in production |
| Open-drain output architecture | Supports bidirectional reset arbitration (e.g., with 68HC11) using single pull-up resistor-no level-shifting required |
| Transient-immune reset comparator | Rejects VCC glitches <150µs wide at 100mV overdrive-reduces false resets in electrically noisy industrial environments |
| Wide VCC operating range | Functions down to 1.2V-ensures supervision remains active during deep brownout or backup battery switchover |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
|
Use Scenario: Monitoring 4.0V auxiliary power rail in DIN-rail mounted I/O modules exposed to 24V field wiring noise. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M4 controller during brownout or ESD-induced supply sag. Use Value: 9.5mV hysteresis and 150µs transient immunity prevent spurious resets from motor-switching noise, while 1µA current extends maintenance intervals. |
Use Scenario: Power-on and brownout supervision for a Bluetooth LE pulse oximeter powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Guarantees ≥100ms reset hold time after cold start, allowing BLE SoC and analog front-end full initialization before firmware execution. Use Value: 1.2V minimum VCC operation ensures supervision remains functional until battery depletes to 1.2V, maximizing usable battery capacity. |
| Motorola 68HC11-Based Controllers | Legacy µP Systems Requiring MAX809 Drop-in |
|
Use Scenario: Interface to bidirectional RESET pin of 68HC11 microcontroller in automotive body control units. IC Role / Device Role / Timing Role: Open-drain RESET output wired directly to µP's RESET pin with single 10kΩ pull-up-enabling either device to force system reset. Use Value: Eliminates need for external logic or MOSFET-level translators, reducing BOM count and PCB area in cost-sensitive designs. |
Use Scenario: Replacement for obsolete MAX809SUR-T in existing SOT23-3 footprint designs requiring 4.0V reset threshold. IC Role / Device Role / Timing Role: Pin-compatible supervisory IC delivering identical 4.0V threshold, open-drain output, and 100ms+ timeout in same SOT23-3 package. Use Value: Enables drop-in replacement without layout change or firmware modification-critical for sustaining legacy industrial equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SUR-T | Same 4.0V threshold, open-drain output, SOT23-3 package, but higher 10µA supply current and no guaranteed operation below 1.8V | Limited to newer 1.8V+ systems; lacks deep-brownout capability for battery-backed designs | Select MAX809SUR-T only if legacy qualification or lower-cost sourcing is prioritized over ultra-low power |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull output, 1.5µA supply current, wider -40°C to +125°C rating | Not suitable for 4.0V rails; requires redesign for push-pull interface and different reset timing (200ms min) | Choose TPS3808G33DBVR only for new 3.3V automotive designs needing extended temperature range-not for MAX6348UR40-T replacement |
Compared with MAX809SUR-T, MAX6348UR40-T delivers 10× lower supply current and 0.6V lower minimum VCC operation, enabling longer battery life and deeper brownout tolerance; versus TPS3808G33DBVR, it offers precise 4.0V threshold and open-drain flexibility but lacks extended temperature support.
Availability
MAX6348UR40-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical sensors, legacy µP upgrades, battery-powered instrumentation, and automotive body control units requiring stable component supply across long production lifecycles.
Supply support for MAX6348UR40-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 MAX63xx family was designed specifically for ultra-low-power, precision voltage monitoring in space-constrained µP systems-emphasizing minimal external components, guaranteed reset timing, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6348UR40-T and how tightly is it specified?
The MAX6348UR40-T has a factory-trimmed nominal reset threshold of 4.000V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range of -40°C to +85°C. This specification is guaranteed by production testing, not just design simulation, and is documented in the Electrical Characteristics table of the official datasheet.
Does the MAX6348UR40-T require an external pull-up resistor on its RESET pin?
Yes, the MAX6348UR40-T features an open-drain RESET output and requires an external pull-up resistor to a valid voltage rail (typically VCC or another logic-compatible supply). The datasheet specifies that RESET sinks up to 1.6mA when asserted, so a standard 4.7kΩ–10kΩ resistor provides appropriate current limiting and logic-level compatibility.
Can the MAX6348UR40-T operate reliably when the VCC supply drops below 2.0V?
Yes, the MAX6348UR40-T is fully specified to operate down to 1.2V VCC over temperature, and its internal reset comparator remains functional and correctly states the RESET output even at 1.0V (guaranteed by design). This makes the MAX6348UR40-T suitable for deep brownout detection and battery end-of-life monitoring in portable systems.
Is the MAX6348UR40-T pin-compatible with the MAX809 series?
Yes, the MAX6348UR40-T uses the same 3-pin SOT23-3 package and identical pinout (GND, RESET, VCC) as the MAX809SUR-T and related variants. Its open-drain output and 4.0V threshold match the MAX809SUR-T functionally, enabling direct drop-in replacement in existing layouts without PCB modification.
What is the maximum duration of a VCC transient that the MAX6348UR40-T can ignore without asserting reset?
At a 100mV overdrive (i.e., VCC dipping 100mV below the 4.0V threshold), the MAX6348UR40-T can tolerate transients up to approximately 150µs without generating a false reset pulse, as shown in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the Typical Operating Characteristics section of the datasheet.
MAX6348UR40-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4V
- Output:
- Open Drain or Open Collector
- 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
MAX6348UR40-T FAQ
1.How can I place an order for MAX6348UR40-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR40-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 MAX6348UR40-T reliable?
The price and inventory of MAX6348UR40-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR40-T is usually 5 days.
3.What payment methods are accepted for MAX6348UR40-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR40-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR40-T?
MAX6348UR40-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR40-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 MAX6348UR40-T?
For technical support, including MAX6348UR40-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR40-T requirements.
6.How does Aetrix verify that MAX6348UR40-T is sourced from the original manufacturer or authorized distributors?
All MAX6348UR40-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 MAX6348UR40-T meets industry standards.
7.What is the process for return or replacement of MAX6348UR40-T?
All MAX6348UR40-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR40-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 MAX6348UR40-T part is unused and in its original packaging.
Return procedure for MAX6348UR40-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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