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Analog Devices Inc./Maxim Integrated MAX6346XR44+
- Part No.:
- MAX6346XR44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,136
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Product details
Overview
The MAX6346XR44+ from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with active-low push-pull reset output, factory-trimmed reset threshold of 4.38V (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, and ultra-low 1µA max supply current. It monitors VCC in 3.3V/5V digital systems and asserts RESET during power-up, brownout, or power-down events.
For engineers reviewing the MAX6346XR44+ datasheet, MAX6346XR44+ pinout, MAX6346XR44+ application, or MAX6346XR44+ equivalent, this device serves as a drop-in replacement for legacy MAX809/MAX810 in space-constrained portable, industrial controller, and intelligent instrumentation designs requiring stable reset assertion and transient immunity.
Technical Context
The MAX6346XR44+ implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) and internal timing capacitor to guarantee ≥100ms reset pulse width after VCC exceeds 4.38V. Its reset assertion remains valid down to VCC = 1.2V over full temperature range.
Designed for direct interface with µP reset pins, the push-pull output drives low (≤0.3V at 1.6mA) when asserted and high (≥0.8·VCC at 500µA source) when released - eliminating need for external pull-up resistors unlike open-drain variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±1.5% (25°C); ±2.5% (-40°C to +85°C) - ensures reliable detection of 5V supply brownout before system instability |
| Reset Timeout | 100ms min - guarantees sufficient hold time for µP initialization across all operating conditions |
| Supply Current | 1µA max - enables multi-year battery life in portable equipment without compromising reset accuracy |
| Operating Range | VCC = 1.2V to 5.5V - supports operation during deep brownout and compatibility with 3.3V/5V logic domains |
| Output Type | Active-low push-pull - eliminates external pull-up, reduces BOM count, and ensures fast, rail-to-rail drive capability |
| Tempco | 40ppm/°C - maintains tight threshold stability over industrial temperature range without calibration |
| Transient Immunity | Rejects VCC glitches <20µs at 100mV overdrive - prevents false resets in noisy power environments |
Pinout & Package
MAX6346XR44+ is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 (RESET) | Active-low push-pull reset output | Drives low (≤0.3V) during reset; actively pulls high (≥0.8·VCC) when released - no external pull-up required |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; includes built-in transient filtering |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed threshold | 4.38V with ±1.5% tolerance at 25°C - eliminates field calibration and reduces test time |
| Ultra-low ICC | 1µA max - extends battery life in always-on monitoring applications such as smart sensors |
| Push-pull output | No external components needed - simplifies layout and improves signal integrity vs. open-drain alternatives |
| Full-temp specification | Guaranteed operation from -40°C to +85°C - suitable for industrial control cabinets and outdoor embedded systems |
| Transient rejection | Immune to VCC glitches <20µs duration - avoids spurious resets in motor-drive or switching-power-supply environments |
Applications
| Industrial PLC I/O Modules | Portable Medical Monitors |
|---|---|
Use Scenario: Power sequencing and brownout protection in programmable logic controller backplane modules exposed to 24V DC supply fluctuations. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 host processor during undervoltage events. Use Value: Prevents firmware corruption by holding processor in reset until 5V rail stabilizes above 4.38V for ≥100ms - critical for deterministic boot behavior. | Use Scenario: Battery-powered ECG and SpO₂ monitors requiring multi-year operation on coin-cell batteries. IC Role / Device Role / Timing Role: Low-current voltage supervisor enabling wake-up reset and safe shutdown sequencing. Use Value: 1µA max ICC preserves battery capacity while ensuring reliable reset assertion even at end-of-life battery voltage (1.2V). |
| Smart Energy Meters | Automated Test Equipment (ATE) |
Use Scenario: Metering ICs powered from isolated 3.3V rails subject to line transients and lightning-induced surges. IC Role / Device Role / Timing Role: Precision reset generator with 40ppm/°C tempco maintaining threshold stability across wide ambient ranges. Use Value: Eliminates false resets during brief AC-line dips, ensuring uninterrupted metrology data logging and tamper detection. | Use Scenario: High-reliability ATE mainframe controllers where firmware integrity must be guaranteed after power cycling. IC Role / Device Role / Timing Role: Primary reset source coordinating FPGA, DSP, and analog front-end initialization sequences. Use Value: Push-pull output drives multiple loads simultaneously without signal degradation - essential for synchronous multi-board reset distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44+T | Same 4.38V threshold, SOT23-3 package, but 2.5µA max ICC and no guaranteed operation below 1.8V | Limited to 3.3V systems with higher supply budgets; not suitable for sub-1.8V brownout detection | Select MAX809TR44+T only if footprint compatibility with legacy SOT23 designs is mandatory and ultra-low ICC is not required. |
| TPS3808G33DBVR | 3.3V fixed threshold, 1.6µA max ICC, wider VCC range (0.8V–6V), but requires external capacitor for timeout adjustment | Not pin-compatible; demands PCB redesign; better for adaptive timeout needs but lacks factory-trimmed precision | Choose TPS3808G33DBVR only when adjustable reset delay or extended low-VCC operation (<1.2V) is prioritized over drop-in replacement. |
Compared with MAX809TR44+T and TPS3808G33DBVR, the MAX6346XR44+ uniquely combines factory-trimmed 4.38V accuracy, 1µA max ICC, guaranteed 1.2V operation, and SC70-3 footprint - making it optimal for new designs demanding minimal BOM, long battery life, and industrial-grade reliability without layout changes.
Availability
MAX6346XR44+ is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6346XR44+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer markets.
The MAX63xx family was designed specifically for cost-sensitive, space-constrained microprocessor supervision in battery-powered and industrial embedded systems - emphasizing ultra-low power, precision thresholds, and minimal external components.
FAQ
What is the exact reset threshold voltage of the MAX6346XR44+ and how tightly is it specified?
The MAX6346XR44+ has a factory-trimmed nominal reset threshold of 4.38V, specified as ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This precision eliminates need for external trimming components and ensures consistent brownout detection across environmental conditions. The MAX6346XR44+ achieves this via laser-trimmed internal resistors and bandgap reference circuitry.
Does the MAX6346XR44+ require any external components to function correctly?
No, the MAX6346XR44+ operates fully autonomously with no external components required. Its internal timing capacitor guarantees ≥100ms reset timeout, and the push-pull output drives both high and low without needing an external pull-up resistor. This makes the MAX6346XR44+ ideal for minimizing BOM count and PCB area in compact designs.
Can the MAX6346XR44+ operate reliably at very low supply voltages, such as during battery depletion?
Yes, the MAX6346XR44+ is guaranteed to maintain correct reset state down to VCC = 1.2V over the full -40°C to +85°C temperature range. This allows it to assert RESET even as the battery discharges deeply - a critical capability for portable medical monitors and remote sensors where system integrity must be preserved until complete power loss.
How does the MAX6346XR44+ handle fast voltage transients on the VCC line?
The MAX6346XR44+ incorporates proprietary comparator design and internal filtering to reject negative-going VCC transients shorter than 20µs when overdriven by 100mV. This immunity prevents false resets caused by switching noise, motor spikes, or ESD events - a key differentiator versus basic reset ICs lacking transient rejection specs.
Is the MAX6346XR44+ pin-compatible with older Maxim reset ICs like the MAX809?
Yes, the MAX6346XR44+ shares identical SC70-3 pinout (GND, RESET, VCC) and electrical behavior with the MAX809 series, including same reset threshold options and push-pull output drive strength. As a result, the MAX6346XR44+ serves as a direct, drop-in upgrade offering lower supply current (1µA vs. 2.5µA), tighter tempco (40ppm/°C), and enhanced low-VCC operation - all without PCB or firmware changes.
MAX6346XR44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX6346XR44+ FAQ
1.How can I place an order for MAX6346XR44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR44+ 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 MAX6346XR44+ reliable?
The price and inventory of MAX6346XR44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR44+ is usually 5 days.
3.What payment methods are accepted for MAX6346XR44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR44+?
MAX6346XR44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR44+ 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 MAX6346XR44+?
For technical support, including MAX6346XR44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR44+ requirements.
6.How does Aetrix verify that MAX6346XR44+ is sourced from the original manufacturer or authorized distributors?
All MAX6346XR44+ 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 MAX6346XR44+ meets industry standards.
7.What is the process for return or replacement of MAX6346XR44+?
All MAX6346XR44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR44+, 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 MAX6346XR44+ part is unused and in its original packaging.
Return procedure for MAX6346XR44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6346XR44+ Tags
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