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Analog Devices Inc./Maxim Integrated MAX6461UR44+
- Part No.:
- MAX6461UR44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6461UR44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
MAX6461UR44+ from Maxim Integrated is a 4.4V ultra-low-power voltage detector in SOT23-3 package, featuring 1.0µA supply current, ±2.5% threshold accuracy over -40°C to +125°C, and 17µs propagation delay. It monitors VCC for brownout detection in battery-powered microcontroller systems, asserting active-low push-pull output when supply falls below 4.4V (VTH−) and releasing only after rising above 4.62V (VTH+ = 4.4V × 1.05).
For engineers reviewing the MAX6461UR44+ datasheet, MAX6461UR44+ pinout, MAX6461UR44+ application, or MAX6461UR44+ equivalent, this page delivers verified specifications, real-world use cases, pin-level design meaning, and validated alternative options for precision power-supply monitoring in space-constrained embedded designs.
Technical Context
The MAX6461UR44+ implements a precision bandgap reference with internally trimmed resistor networks to set its factory-trimmed 4.4V lower trip threshold (VTH−), paired with fixed 5% hysteresis yielding VTH+ = 4.62V. Its comparator-based architecture ensures deterministic reset assertion without external components.
Designed exclusively as a voltage detector (not a supervisory circuit with timeout), it lacks internal reset timing circuitry-distinguishing it from MAX6464–MAX6466 variants-and delivers fast 17µs response to VCC droop while rejecting transients under 10µs at 200mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 6.0V - supports operation down to near-dead battery levels while monitoring up to 5.5V nominal rails |
| Threshold Voltage (VTH−) | 4.400V (typ) at +25°C, 4.290V to 4.510V over -40°C to +125°C - enables precise 4.4V brownout detection for 4.5V logic systems |
| Hysteresis | 5% (VTH+ = VTH− × 1.05) - prevents output chatter during slow-rising/falling supply transitions |
| Supply Current (ICC) | 1.0µA (typ) at 3.6V, ≤3.5µA at +125°C - extends battery life in always-on portable devices |
| Propagation Delay | 17µs (typ) - ensures rapid fault response without compromising noise immunity |
| Output Type | Push-pull, active-low - drives CMOS/TTL loads directly without pull-up resistor |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
SOT23-3 package: 3-pin surface-mount, 1.3mm × 2.9mm footprint, 1.45mm height, lead-free (RoHS-compliant) per +T suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Active-low push-pull output | Asserts low when VCC < 4.4V; releases high when VCC > 4.62V; sinks/source capable per VOL/VOH specs |
| 2 (GND) | Ground reference | Return path for internal bandgap and comparator; must be low-impedance connection to system ground plane |
| 3 (VCC) | Supply input & monitored voltage | Single pin powers device and provides the voltage being supervised - no separate sense input |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1.0µA supply current | Enables multi-year battery life in coin-cell–powered IoT sensors and wearables |
| ±2.5% threshold accuracy over temperature | Guarantees reliable reset behavior across automotive and industrial thermal extremes without calibration |
| Internal 5% hysteresis | Eliminates need for external hysteresis resistors, reducing BOM count and PCB area |
| No external components required | Reduces design complexity and qualification effort for safety-critical brownout detection |
| Immunity to short voltage transients | Rejects sub-10µs glitches common in switching power supplies and motor drive environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, requiring undervoltage lockout before sensor data corruption occurs. IC Role / Device Role / Timing Role: Voltage detector asserting MCU reset when battery drops below 4.4V, preventing invalid ADC readings and BLE transmission errors. Use Value: 1.0µA quiescent current extends usable battery life beyond 2 years; ±2.5% threshold stability ensures consistent trip point across body-temperature variations. |
Use Scenario: DIN-rail mounted analog input module operating in factory environments with 24VDC supply subject to line transients. IC Role / Device Role / Timing Role: Brownout supervisor monitoring 3.3V LDO output derived from 24V bus, triggering controlled shutdown before ADC reference collapse. Use Value: 17µs propagation delay enables faster response than discrete Zener+transistor solutions; -40°C to +125°C rating matches industrial ambient requirements. |
| Automotive Telematics Units | Smart Home Battery Backup Systems |
Use Scenario: LTE modem module in vehicle infotainment system, powered via 5V rail derived from 12V battery with load-dump protection. IC Role / Device Role / Timing Role: Primary undervoltage detector on 5V domain, asserting reset to prevent firmware crash during cold-cranking events. Use Value: Immunity to 10µs transients avoids false resets during alternator switching; 4.4V threshold aligns with 5V regulator dropout margin. |
Use Scenario: Wi-Fi gateway with Li-ion backup, where main AC supply failure must trigger seamless switchover before RTC or memory corruption. IC Role / Device Role / Timing Role: Supervisor on 3.3V system rail, detecting AC loss via 5V-to-3.3V LDO input drop, initiating backup enable sequence. Use Value: Single-SOT23-3 footprint minimizes layout area on dense power management PCB; lead-free +T packaging meets RoHS compliance for consumer electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB44DBZR | 4.4V threshold, 0.5µA ICC, SOT23-3, but only ±3% accuracy over -40°C to +85°C (not +125°C) | Limited to commercial-temperature applications; unsuitable for under-hood or extended industrial use | Select if cost sensitivity outweighs extended temperature requirement and ultra-low ICC is critical |
| TPS3808G33DBVR | 3.3V fixed threshold, 1.1µA ICC, SOT23-5, includes manual reset input and 200ms timeout | Not a direct threshold match; adds features irrelevant to simple 4.4V detection, increasing pin count and complexity | Choose only if system requires manual reset capability or higher-voltage tolerance (up to 6.8V) |
Compared with TLV803EB44DBZR and TPS3808G33DBVR, the MAX6461UR44+ uniquely delivers 4.4V detection with ±2.5% accuracy across -40°C to +125°C and 1.0µA ICC in a 3-pin SOT23, making it the optimal choice for ruggedized, battery-sensitive brownout monitoring where pin count and thermal range are decisive.
Availability
MAX6461UR44+ is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, automotive telematics units, and smart home battery backup systems requiring stable component supply across extended temperature ranges and ultra-low power consumption.
Supply support for MAX6461UR44+ 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, automotive, and communications markets.
The MAX6461UR44+ belongs to the MAX6461–MAX6466 voltage detector family, engineered for ultra-low-power, high-accuracy supply monitoring in battery-critical and thermally demanding embedded systems.
FAQ
What is the exact voltage threshold of the MAX6461UR44+?
The MAX6461UR44+ has a factory-set lower trip threshold (VTH−) of 4.400V (typical) at +25°C, with guaranteed range of 4.290V to 4.510V over -40°C to +125°C. Its upper threshold (VTH+) is 4.62V (4.4V × 1.05) due to internal 5% hysteresis, ensuring clean output transition without oscillation near the trip point. This is confirmed in Table 1a and Electrical Characteristics section of the MAX6461–MAX6466 datasheet.
Does the MAX6461UR44+ include a reset timeout function?
No, the MAX6461UR44+ does not include a reset timeout function. It is a pure voltage detector (per MAX6461 designation), providing immediate active-low output assertion when VCC falls below VTH− and release when VCC rises above VTH+. Timeout functionality (150ms minimum) is exclusive to MAX6464–MAX6466 variants. The MAX6461UR44+ datasheet explicitly states "MAX6461/MAX6462/MAX6463 only" for propagation delay and omits tRP parameter for this part.
What is the output configuration of the MAX6461UR44+?
The MAX6461UR44+ features a push-pull, active-low output stage in SOT23-3 package. Pin 1 (OUT) drives low when VCC < 4.4V and high when VCC > 4.62V, eliminating need for external pull-up resistors. This is confirmed by the Ordering Information table (UR suffix = SOT23-3, active-low push-pull) and Pin Description section, which specifies "Push-pull (active-low or active-high)" options for MAX6461.
Can the MAX6461UR44+ operate down to 1.2V supply?
Yes, the MAX6461UR44+ operates across VCC = 1.2V to 6.0V per Absolute Maximum Ratings and Electrical Characteristics tables. However, its 4.4V threshold detection is only valid when VCC ≥ 4.4V; below that, the output asserts low and remains asserted. At VCC < 1.2V, internal circuitry may cease functioning - the 1.2V lower limit defines minimum functional supply, not detection range.
Is the MAX6461UR44+ RoHS-compliant and lead-free?
Yes, the "+" suffix in MAX6461UR44+ explicitly denotes lead-free, RoHS-compliant packaging per Maxim's ordering convention (replacing "-T" with "+T"). The datasheet confirms: "Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing '-T' with '+T' when ordering." This part ships in tape-and-reel format with matte tin terminations meeting JEDEC J-STD-020 moisture sensitivity level 1.
MAX6461UR44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active Low
- Reset Timeout:
- 14µs Typical Propagation Delay
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6461UR44+ FAQ
1.How can I place an order for MAX6461UR44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6461UR44+ 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 MAX6461UR44+ reliable?
The price and inventory of MAX6461UR44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6461UR44+ is usually 5 days.
3.What payment methods are accepted for MAX6461UR44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6461UR44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6461UR44+?
MAX6461UR44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6461UR44+ 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 MAX6461UR44+?
For technical support, including MAX6461UR44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6461UR44+ requirements.
6.How does Aetrix verify that MAX6461UR44+ is sourced from the original manufacturer or authorized distributors?
All MAX6461UR44+ 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 MAX6461UR44+ meets industry standards.
7.What is the process for return or replacement of MAX6461UR44+?
All MAX6461UR44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6461UR44+, 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 MAX6461UR44+ part is unused and in its original packaging.
Return procedure for MAX6461UR44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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