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Analog Devices Inc./Maxim Integrated MAX6348UR46+T
- Part No.:
- MAX6348UR46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,615
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Product details
Overview
MAX6348UR46+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 4.63V power supplies and assert reset during brownout, power-up, and 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 4.63V threshold with ±2.5% tolerance over –40°C to +85°C - used in battery-powered controllers requiring reliable, low-power reset assertion.
For engineers reviewing the MAX6348UR46+T datasheet, MAX6348UR46+T pinout, MAX6348UR46+T application, or MAX6348UR46+T equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), immunity to sub-200ns VCC transients at 4.63V threshold overdrive, and SOT23-3 footprint suitability for space-constrained portable designs.
Technical Context
The MAX6348UR46+T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) and internal timing circuitry to generate a minimum 100ms active-low reset pulse after VCC rises above 4.63V. Its open-drain RESET output requires an external pull-up and supports bidirectional reset arbitration in systems where the microcontroller may also drive the reset line.
It operates across full industrial temperature range (–40°C to +85°C) with guaranteed functionality down to 1.2V VCC, and its reset comparator rejects fast negative-going transients - maximum allowable glitch duration is <200ns when VCC dips 100mV below 4.63V, per Typical Operating Characteristics data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (±2.5% over –40°C to +85°C); ensures reliable detection of 4.63V supply collapse before system instability. |
| Supply Current | ≤1.0µA at +25°C; enables multi-year battery life in always-on portable instrumentation. |
| Reset Timeout | 100ms to 280ms (min/max); guarantees sufficient hold time for µP initialization after power recovery. |
| Output Type | Open-drain active-low RESET; allows wired-OR with other reset sources and interface to bidirectional µP reset pins. |
| VCC Operating Range | 1.2V to 5.5V; supports valid reset assertion even during deep brownout conditions. |
| Reset Hysteresis | 9.5mV; prevents chatter near threshold during slow VCC ramp-up or noise. |
| Transient Immunity | Rejects <200ns glitches at 100mV overdrive; eliminates false resets from EMI or switching noise. |
Pinout & Package
MAX6348UR46+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads compatible with standard reflow profiles.
| 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 resistor (typically 10kΩ to VCC or higher rail) to define logic-high level. |
| 3 - VCC | Supply input | Monitored power rail input; also powers internal circuitry; accepts 1.2V–5.5V with guaranteed reset behavior down to 1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤1.0µA max at +25°C - extends shelf life and runtime in coin-cell–powered devices. |
| Factory-trimmed precision threshold | 4.63V ±2.5% over full temperature range - eliminates need for external trimming or calibration. |
| Open-drain output architecture | Enables direct interface to bidirectional µP reset pins (e.g., 68HC11) without level-shifting or isolation diodes. |
| Power-supply transient immunity | Immune to VCC glitches <200ns wide at 100mV overdrive - suppresses false resets in noisy DC/DC environments. |
| No external components required | Single-chip solution with integrated comparator, timer, and reference - reduces BOM count and PCB area. |
Applications
| Industrial Controllers | Battery-Powered Instruments |
|---|---|
|
Use Scenario: PLC I/O modules powered by 4.6V LDOs operating in harsh factory environments with voltage sags and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M4 controller during brownout, holding reset ≥100ms post-recovery. Use Value: Prevents firmware corruption by ensuring CPU remains held in reset until 4.63V rail stabilizes and clock domains settle. |
Use Scenario: Handheld multimeter with CR2032 coin cell powering a low-voltage µC and analog front-end. IC Role / Device Role / Timing Role: Open-drain RESET output pulled up to 3.3V domain, enabling shared reset bus with display driver and ADC. Use Value: Enables bidirectional reset arbitration - meter can initiate self-test reset while supervisor asserts power-fail reset. |
| Intelligent Sensors | Embedded Communication Gateways |
|
Use Scenario: Wireless temperature node using 4.6V Li-SOCl₂ primary battery and ultra-low-power BLE SoC. IC Role / Device Role / Timing Role: Monitors main 4.63V supply and asserts reset if voltage drops below threshold due to cold-temperature impedance rise. Use Value: Guarantees clean boot after battery recovery from low-temp discharge, avoiding partial register initialization. |
Use Scenario: Industrial Ethernet gateway with dual-rail power (5V for PHY, 3.3V for µP) and watchdog cohabitation. IC Role / Device Role / Timing Role: Provides primary power-on reset signal synchronized to 4.63V auxiliary rail; RESET output wired-OR'd with watchdog reset. Use Value: Ensures deterministic system startup even if watchdog IC powers up earlier or later than µP domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6348XR46+T | Identical electrical specs and reset threshold, but in SC70-3 package (1.25mm × 2.0mm vs. SOT23's 1.3mm × 2.9mm). | Preferred for ultra-dense layouts where 0.65mm shorter body and 0.05mm lower profile reduce mechanical interference. | Select MAX6348XR46+T only when board space or height constraints preclude SOT23 mounting. |
| MAX809TR46+T | Same 4.63V threshold and open-drain output, but higher 2.5µA max supply current and no guaranteed operation below 1.8V VCC. | Limited to 3.3V/5V systems with less aggressive brownout requirements; lacks low-VCC validity for sub-1.8V operation. | Choose MAX809TR46+T only if legacy design reuse mandates pin-compatible replacement and 1.2V operation is not required. |
Compared with MAX6348XR46+T, the MAX6348UR46+T offers identical supervision performance in a more widely supported SOT23 footprint; versus MAX809TR46+T, it delivers 2.5× lower quiescent current and robust 1.2V brownout detection - critical for modern ultra-low-power embedded systems.
Availability
MAX6348UR46+T is available at Aetrix Electronics and suitable for industrial controllers, battery-powered instruments, and intelligent sensors requiring stable component supply with guaranteed long-term availability and RoHS-compliant sourcing.
Supply support for MAX6348UR46+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 power-supply monitoring in space- and energy-constrained microprocessor systems - emphasizing minimal external components, guaranteed low-VCC operation, and transient-immune reset generation.
FAQ
What is the exact reset threshold voltage of MAX6348UR46+T and how tightly is it specified?
The MAX6348UR46+T has a factory-trimmed nominal reset threshold of 4.63V, with a tolerance of ±2.5% over the full operating temperature range of –40°C to +85°C. At +25°C, the threshold is tighter at ±1.5%. This specification ensures consistent brownout detection across environmental conditions without requiring external calibration - a key requirement for reliable operation in industrial and portable equipment where supply rails drift with temperature.
Does MAX6348UR46+T support operation at VCC voltages below 1.8V, and what is the minimum functional VCC?
Yes, the MAX6348UR46+T is fully specified to operate down to VCC = 1.2V across –40°C to +85°C, guaranteeing correct reset assertion and release behavior even during deep brownout. This capability is explicitly validated in the Electrical Characteristics table and distinguishes it from many legacy supervisors that fail below 1.8V. The device remains in a known state and continues monitoring until VCC reaches 1.2V, making it suitable for ultra-low-voltage battery-backed systems.
What is the purpose of the open-drain output on MAX6348UR46+T, and how should it be interfaced?
The open-drain RESET output on MAX6348UR46+T enables wired-OR connectivity with other reset sources (e.g., watchdog timers, manual reset buttons) and direct interfacing with microprocessors featuring bidirectional reset pins like the Motorola 68HC11. It must be pulled up externally - typically with a 10kΩ resistor to the relevant logic rail (e.g., 3.3V or 5V). This architecture avoids contention and allows any device on the shared reset bus to assert reset independently, which is essential for fault-tolerant embedded designs.
How does MAX6348UR46+T handle fast transients on the VCC line, and what is its immunity limit?
The MAX6348UR46+T incorporates comparator hysteresis and internal filtering to reject fast negative-going VCC transients. Per the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", it ignores glitches shorter than ~180ns when VCC dips 100mV below the 4.63V threshold. This immunity prevents spurious resets caused by switching noise or EMI in DC/DC converter outputs - a critical feature for stable operation in electrically noisy industrial environments.
Is MAX6348UR46+T pin-compatible with older Maxim reset supervisors such as the MAX809 series?
No, MAX6348UR46+T is not pin-compatible with the MAX809 series. While both are 3-pin SOT23 supervisory circuits with open-drain outputs, the pinout differs: MAX6348UR46+T uses Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC; MAX809 variants use Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET. Swapping them without PCB revision will result in incorrect power connection and functional failure. Always verify pin mapping before substitution.
MAX6348UR46+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:
- 4.63V
- 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
MAX6348UR46+T FAQ
1.How can I place an order for MAX6348UR46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR46+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 MAX6348UR46+T reliable?
The price and inventory of MAX6348UR46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR46+T is usually 5 days.
3.What payment methods are accepted for MAX6348UR46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR46+T?
MAX6348UR46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR46+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 MAX6348UR46+T?
For technical support, including MAX6348UR46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR46+T requirements.
6.How does Aetrix verify that MAX6348UR46+T is sourced from the original manufacturer or authorized distributors?
All MAX6348UR46+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 MAX6348UR46+T meets industry standards.
7.What is the process for return or replacement of MAX6348UR46+T?
All MAX6348UR46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR46+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 MAX6348UR46+T part is unused and in its original packaging.
Return procedure for MAX6348UR46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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