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Analog Devices Inc./Maxim Integrated MAX6348UR42-T
- Part No.:
- MAX6348UR42-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6348UR42-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,377
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Product details
Overview
MAX6348UR42-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in SOT23-3 package, monitoring VCC supply voltage with a factory-trimmed 4.20V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, and ultra-low 1µA max supply current at 3V - used for reliable power-on/brownout reset assertion in battery-powered µP systems.
For engineers reviewing the MAX6348UR42-T datasheet, MAX6348UR42-T pinout, MAX6348UR42-T application, or MAX6348UR42-T equivalent, this page delivers verified electrical parameters, thermal behavior, transient immunity specs, open-drain interface constraints, and direct alternatives for embedded reset supervision design.
Technical Context
The MAX6348UR42-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 9.5mV hysteresis, asserting RESET low when VCC drops below 4.20V and holding it active ≥100ms after VCC recovers above threshold. It operates down to 1.2V VCC and ignores transients ≤20µs at 100mV overdrive.
Its open-drain RESET output requires an external pull-up resistor and supports bidirectional µP reset pins (e.g., Motorola 68HC11), enabling either the supervisor or µP to drive reset. Leakage current is ≤0.1µA when RESET is inactive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.20V ±2.5% (–40°C to +85°C); ensures reliable brownout detection for 3.3V/5V systems with margin against ripple. |
| Reset Timeout | 100ms min power-up delay; guarantees µP initialization completes before release from reset state. |
| Supply Current | 1.0µA max at 3V; enables multi-year operation in coin-cell–powered IoT sensors and portable instruments. |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration and compatibility with bidirectional µP reset pins. |
| VCC Operating Range | 1.2V to 5.5V; supports supervision of low-voltage logic rails and legacy 5V subsystems without external biasing. |
| Transient Immunity | Rejects VCC glitches ≤20µs at 100mV overdrive; 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
SOT23-3 package: 2.92mm × 1.3mm × 1.02mm body, gull-wing leads, RoHS-compliant lead-free option available as MAX6348UR42+T.
| 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 | Drives low during fault; requires external pull-up (typically 10kΩ to VCC) to define high state and enable bidirectional reset control. |
| 3 (VCC) | Supply input | Monitored power rail input; accepts 1.2V–5.5V; internal regulator derives bias for comparator and output driver. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max at 3V enables >10-year battery life in always-on remote sensors and wearables. |
| Factory-trimmed VTH | 4.20V threshold set at wafer level with ±1.5% tolerance at +25°C, eliminating calibration components. |
| Open-drain output | Supports shared reset bus with multiple devices and interfaces directly to µPs with bidirectional reset pins (e.g., 68HC11). |
| Wide VCC range | Operates from 1.2V to 5.5V, allowing single-part support across 1.8V, 3.3V, and 5V logic families without redesign. |
| Temperature-stable hysteresis | 9.5mV fixed hysteresis prevents oscillation during slow VCC recovery near threshold, ensuring clean reset release. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose monitors and pulse oximeters requiring guaranteed startup integrity after cold boot or low-battery wake-up. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and asserts reset until stable; open-drain output interfaces with ARM Cortex-M0+ reset pin. Use Value: 1µA quiescent current extends CR2032 battery life beyond 5 years; 4.20V threshold guards against brownout during RF transmission bursts. |
Use Scenario: DIN-rail mounted I/O modules exposed to 24V DC field power with wide ambient temperature swings (–40°C to +70°C). IC Role / Device Role / Timing Role: Monitors regulated 5V logic rail derived from industrial SMPS; provides 100ms reset hold to synchronize FPGA configuration. Use Value: ±2.5% threshold accuracy over full temperature range ensures consistent reset behavior across operating conditions without recalibration. |
| Smart Energy Meters | Automotive Body Control Units |
|
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply architecture (3.3V MCU + 1.8V metrology ASIC). IC Role / Device Role / Timing Role: Supervises 3.3V domain; open-drain RESET ties to shared reset bus with isolated communication ICs (e.g., RS-485 transceivers). Use Value: Wired-OR capability enables centralized reset arbitration; 9.5mV hysteresis prevents chatter during line-voltage sags on utility grid input. |
Use Scenario: Low-power door module controllers powered from vehicle battery (9V–16V) with LDO-regulated 3.3V rail. IC Role / Device Role / Timing Role: Resets microcontroller during ignition cycling and load-dump transients; immune to <20µs spikes per spec. Use Value: Transient rejection eliminates spurious resets during alternator switching; SOT23-3 footprint fits constrained space behind door panel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR42-T | Same 4.20V threshold, identical SOT23-3 package and open-drain output, but rated only for 0°C to +70°C industrial temp range. | Limited to commercial-temperature environments; not qualified for extended automotive or outdoor industrial use. | Select MAX6328UR42-T only if operating ambient stays within 0°C–70°C and cost sensitivity outweighs temperature margin. |
| TPS3808G33DBVR | 3.3V fixed threshold, push-pull output, 1.6µA typical ICC, same SOT23-3 package; no factory-trimmed variants. | Requires board-level redesign for open-drain interface; lacks 4.20V threshold match for 5V-system brownout detection. | Choose TPS3808G33DBVR only when 3.3V rail supervision suffices and push-pull drive simplifies layout by eliminating pull-up resistor. |
Compared with MAX6348UR42-T, MAX6328UR42-T sacrifices extended temperature coverage for lower cost, while TPS3808G33DBVR trades threshold flexibility and open-drain interoperability for tighter production tolerance and integrated watchdog timer - neither is pin-compatible, and both require schematic validation for reset bus topology.
Availability
MAX6348UR42-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6348UR42-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 power, sensing, and interface applications, with emphasis on reliability and integration for harsh-environment systems.
The MAX63xx family targets ultra-low-power microprocessor supervision in space-constrained, battery-sensitive, and thermally demanding applications - delivering guaranteed reset timing, minimal external components, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6348UR42-T and how does it vary with temperature?
The MAX6348UR42-T has a nominal reset threshold of 4.20V at +25°C, with ±1.5% tolerance 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 ±10.5mV across the temperature span - confirmed in the Electrical Characteristics table under "Reset Threshold" and "Reset Threshold Tempco" parameters.
Does MAX6348UR42-T require an external pull-up resistor on its RESET pin?
Yes, MAX6348UR42-T features an open-drain RESET output and requires an external pull-up resistor to the appropriate logic rail (e.g., 3.3V or 5V). Typical values range from 4.7kΩ to 10kΩ; the datasheet specifies RESET leakage ≤0.1µA when inactive, ensuring minimal current draw and predictable high-state voltage under all operating conditions.
Can MAX6348UR42-T supervise a 1.8V supply rail?
No - MAX6348UR42-T is not specified to monitor 1.8V rails. Its 4.20V reset threshold is designed for 3.3V and 5V systems. While the device itself operates down to 1.2V VCC, it cannot assert reset for supply voltages below its threshold. For 1.8V supervision, select a variant like MAX6348UR18-T (if available) or use a dedicated low-threshold supervisor such as MAX6326UR18-T.
How does the transient immunity of MAX6348UR42-T prevent false resets?
MAX6348UR42-T rejects fast negative-going VCC transients up to 20µs duration when the overdrive (VTH – VCC) is 100mV, as shown in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph. This built-in filtering ensures that common switching noise, ESD-induced dips, or LDO dropout events do not trigger unintended reset pulses - critical for stable operation in electrically noisy industrial environments.
Is MAX6348UR42-T pin-compatible with the MAX809 series?
No - although the MAX6348UR42-T is functionally similar to the MAX809 series and shares the same SOT23-3 footprint, it is not pin-compatible due to differing pin assignments: MAX6348UR42-T uses Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC, whereas MAX809 places RESET on Pin 1 and GND on Pin 3. Swapping them without layout revision will cause functional failure.
MAX6348UR42-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:
- 4.2V
- 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
MAX6348UR42-T FAQ
1.How can I place an order for MAX6348UR42-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6348UR42-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 MAX6348UR42-T reliable?
The price and inventory of MAX6348UR42-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6348UR42-T is usually 5 days.
3.What payment methods are accepted for MAX6348UR42-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6348UR42-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6348UR42-T?
MAX6348UR42-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6348UR42-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 MAX6348UR42-T?
For technical support, including MAX6348UR42-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6348UR42-T requirements.
6.How does Aetrix verify that MAX6348UR42-T is sourced from the original manufacturer or authorized distributors?
All MAX6348UR42-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 MAX6348UR42-T meets industry standards.
7.What is the process for return or replacement of MAX6348UR42-T?
All MAX6348UR42-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6348UR42-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 MAX6348UR42-T part is unused and in its original packaging.
Return procedure for MAX6348UR42-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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