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Analog Devices Inc./Maxim Integrated MAX6346UR44-T
- Part No.:
- MAX6346UR44-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR44-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
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Product details
Overview
The MAX6346UR44-T from Maxim Integrated is a push-pull, active-low microprocessor supervisory circuit designed to monitor 4.38V power supplies and assert a reset signal during brownout or power-up conditions. It delivers 1µA max supply current, guarantees correct operation down to 1.2V VCC, provides ≥100ms reset timeout after VCC recovery, and features factory-trimmed reset threshold accuracy of ±2.5% over -40°C to +85°C. It is used in portable battery-powered systems requiring reliable, low-power reset supervision.
For engineers reviewing the MAX6346UR44-T datasheet, MAX6346UR44-T pinout, MAX6346UR44-T application, or MAX6346UR44-T equivalent, key selection criteria include its 4.38V reset threshold, SOT23-3 package, push-pull active-low output, 100ms minimum reset timeout, and immunity to fast VCC transients - all critical for embedded µP power monitoring in space-constrained, low-quiescent-current designs.
Technical Context
The MAX6346UR44-T implements a precision bandgap-based reset comparator with 9.5mV hysteresis and 40ppm/°C tempco, ensuring stable threshold behavior across temperature. Its internal timing circuit generates a guaranteed minimum 100ms reset pulse width after VCC rises above 4.38V, with typical timeout ranging from 100ms to 280ms depending on temperature and VCC slew rate.
It operates from 1.2V to 5.5V VCC and maintains valid reset state down to 1V, enabling robust supervision even during deep brownout. The push-pull output drives RESET low with ≤0.4V VOL at 100µA sink (VCC ≥ 1.2V), and releases high with VOH ≥ 0.8·VCC when deasserted - eliminating need for external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% over -40°C to +85°C - ensures reliable detection of 4.38V rail collapse without false triggering. |
| Supply Current | 1.0µA max at +25°C - enables multi-year battery life in always-on portable equipment. |
| Reset Timeout | 100ms min after VCC rise - meets JEDEC JESD78 requirement for µP initialization stability. |
| VCC Operating Range | 1.2V to 5.5V - supports supervision of legacy 5V, modern 3.3V/2.5V, and ultra-low-voltage subsystems. |
| Output Type | Active-low push-pull - directly interfaces with µP reset pins without external components or pull-ups. |
| Reset Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near threshold. |
| Transient Immunity | Rejects VCC glitches <100µs at 100mV overdrive - avoids spurious resets in noisy power environments. |
Pinout & Package
MAX6346UR44-T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane for accurate threshold sensing. |
| 2 (RESET) | Active-low push-pull reset output | Drives low during fault; releases high when VCC > 4.38V + hysteresis; sinks up to 1.6mA, sources limited by VOH spec. |
| 3 (VCC) | Supply input | Monitored power rail input; also powers internal circuitry; accepts 1.2V–5.5V with full functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA max enables >10-year battery life in coin-cell–powered IoT sensors and wearables. |
| Precision 4.38V reset threshold | Factory-trimmed to ±2.5% over full temperature range - eliminates manual calibration in production. |
| No external components required | Integrated timing capacitor and comparator eliminate BOM cost and layout area vs. discrete RC reset solutions. |
| Push-pull active-low output | Directly drives standard µP reset inputs without pull-up resistor - reduces component count and improves noise margin. |
| Guaranteed reset assertion down to 1V VCC | Ensures valid reset state during deep brownout, preventing undefined µP execution before power stabilizes. |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Supervising 4.38V auxiliary power rails in programmable logic controllers exposed to wide ambient temperatures and EMI. IC Role / Device Role / Timing Role: Resets ARM Cortex-M7 host processor upon 4.38V rail sag below threshold, holding reset ≥100ms post-recovery. Use Value: Prevents firmware corruption during factory floor voltage sags while maintaining <1µA standby drain on backup supercapacitor. |
Use Scenario: Monitoring 4.38V Li-ion battery–derived rail in handheld ECG devices operating 24/7 on single charge. IC Role / Device Role / Timing Role: Asserts active-low reset to MSP430F6779 MCU when battery voltage drops below 4.38V, initiating graceful shutdown. Use Value: Extends usable battery runtime by avoiding unnecessary reset cycles during transient load spikes due to 9.5mV hysteresis and glitch rejection. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Securing metering SoC (e.g., STPM32) powered from 4.38V LDO during AC mains interruptions. IC Role / Device Role / Timing Role: Generates clean, jitter-free reset pulse synchronized to 4.38V rail recovery - no external filtering needed. Use Value: Meets IEC 62053-21 reset timing requirements while reducing bill-of-materials by eliminating RC network and associated tolerance stack-up. |
Use Scenario: Supervising 4.38V domain in BCM subassembly where CAN transceivers and LIN drivers share regulated rail. IC Role / Device Role / Timing Role: Forces cold reset of Infineon AURIX TC3xx safety MCU if 4.38V rail collapses during load dump events. Use Value: Achieves ASIL-B compliant reset assertion with guaranteed 100ms hold time and immunity to 100ns–100µs transients per ISO 7637-2 Pulse 1/2a. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44-T | Same 4.38V threshold, but 2.5µA max ICC and only specified down to 1.0V VCC (not 1.2V); no guaranteed 100ms timeout spec. | Lacks guaranteed reset timeout and higher supply current limit it unsuitable for multi-year battery applications. | Select MAX6346UR44-T when >5-year battery life, precise 100ms+ timeout, or operation below 1.2V VCC is required. |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.38V); 1.8µA max ICC; requires external pull-up for open-drain output; different SOT23-6 pinout. | Not pin-compatible; mismatched threshold invalidates direct substitution in 4.38V rail monitoring. | Choose MAX6346UR44-T for drop-in replacement in existing 4.38V designs using SOT23-3 footprint and push-pull drive. |
Compared with MAX809TR44-T and TPS3808G33DBVR, the MAX6346UR44-T uniquely combines 4.38V precision, 1µA max supply current, guaranteed 100ms+ reset timeout, and SOT23-3 push-pull compatibility - making it the only option meeting all three requirements simultaneously for long-life, space-constrained 4.38V supervision.
Availability
MAX6346UR44-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 MAX6346UR44-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 engineered specifically for ultra-low-power, precision reset supervision in battery-critical and space-constrained embedded systems - prioritizing sub-µA quiescent current, factory-trimmed thresholds, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6346UR44-T?
The MAX6346UR44-T has a factory-trimmed nominal reset threshold of 4.38V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). At +25°C, the threshold is specified as 4.314V (min), 4.380V (typ), and 4.446V (max), per Table 1 in the official datasheet.
Does the MAX6346UR44-T require an external pull-up resistor on the RESET pin?
No, the MAX6346UR44-T features a push-pull active-low RESET output and does not require an external pull-up resistor. Its output actively drives low during reset assertion and actively pulls high when released, unlike open-drain alternatives such as the MAX6348UR44-T.
What is the minimum VCC voltage at which the MAX6346UR44-T guarantees correct reset state?
The MAX6346UR44-T guarantees correct reset state (i.e., RESET remains asserted) for VCC down to 1.2V over the full -40°C to +85°C temperature range. The device remains functional and maintains valid reset behavior even as VCC declines to 1.0V, though this lower limit is not production-tested.
How long does the RESET signal stay active after VCC recovers above the threshold?
The MAX6346UR44-T guarantees a minimum reset timeout of 100ms after VCC rises above the 4.38V threshold. Typical timeout ranges from 100ms to 280ms depending on temperature and VCC slew rate, with 185ms typical at +25°C - fully satisfying JEDEC JESD78 reliability requirements.
Is the MAX6346UR44-T pin-compatible with other members of the MAX63xx family?
Yes, the MAX6346UR44-T shares identical SOT23-3 pinout (GND, RESET, VCC) and footprint with all MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 variants in U3-1 package, including MAX6326UR22-T and MAX6347UR44-T - enabling design reuse across threshold and output-type variants.
MAX6346UR44-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:
- 4.4V
- 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:
- SOT-23-3
MAX6346UR44-T FAQ
1.How can I place an order for MAX6346UR44-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR44-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 MAX6346UR44-T reliable?
The price and inventory of MAX6346UR44-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR44-T is usually 5 days.
3.What payment methods are accepted for MAX6346UR44-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR44-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR44-T?
MAX6346UR44-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR44-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 MAX6346UR44-T?
For technical support, including MAX6346UR44-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR44-T requirements.
6.How does Aetrix verify that MAX6346UR44-T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR44-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 MAX6346UR44-T meets industry standards.
7.What is the process for return or replacement of MAX6346UR44-T?
All MAX6346UR44-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR44-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 MAX6346UR44-T part is unused and in its original packaging.
Return procedure for MAX6346UR44-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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