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Analog Devices Inc./Maxim Integrated MAX6351SVUT+
- Part No.:
- MAX6351SVUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351SVUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
The MAX6351SVUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs (RST1 referenced to VCC1, RST2 referenced to VCC2), factory-set precision thresholds of 2.93V (VCC1) and 1.58V (VCC2), 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1V or VCC2 ≥ 1V - used in multivoltage embedded systems requiring reliable power-on and brownout detection.
For engineers reviewing the MAX6351SVUT+ datasheet, MAX6351SVUT+ pinout, MAX6351SVUT+ application, or MAX6351SVUT+ equivalent, key selection considerations include dual-supply threshold pairing, push-pull output referencing, manual-reset debouncing, temperature-stable reset timeout (100–280ms), and SOT23-6 package compatibility for space-constrained PCB layouts.
Technical Context
The MAX6351SVUT+ implements independent voltage monitoring on two supplies (VCC1 and VCC2) with separate trip points and dedicated push-pull reset outputs - RST1 asserts when VCC1 falls below 2.93V (±0.05V over -40°C to +85°C), RST2 asserts when VCC2 falls below 1.58V (±0.05V). Both outputs remain valid as long as either supply stays above +1.0V.
It features a debounced TTL/CMOS-compatible manual-reset input (MR), no watchdog timer or third-voltage monitor (distinguishing it from MAX6358–MAX6360 and MAX6355–MAX6357), and operates across the full industrial temperature range (-40°C to +85°C) with 20ppm/°C reset threshold tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±0.05V at -40°C to +85°C - sets precise brownout detection point for primary supply |
| VCC2 Threshold | 1.58V ±0.05V at -40°C to +85°C - enables reliable monitoring of low-voltage rails (e.g., 1.8V core with margin) |
| Supply Current | 20µA typical - ensures minimal quiescent load on battery-backed or energy-sensitive systems |
| Reset Timeout | 100–280ms - guarantees sufficient processor initialization time after power-up or fault recovery |
| RESET Valid Down To | VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - maintains deterministic reset state during deep brownout or soft-start conditions |
| Reset Output Type | Two active-low push-pull outputs - eliminates need for external pull-ups and supports direct interface to CMOS inputs |
| Package | 6-pin SOT23 - surface-mount footprint compatible with automated assembly and high-density routing |
Pinout & Package
MAX6351SVUT+ is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with exposed pad not connected internally. The device uses standard JEDEC SOT23-6 dimensions (2.9mm × 1.6mm × 1.1mm) and is RoHS-compliant (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1 - asserts when VCC1 drops below 2.93V |
| 2 | GND | Analog/digital ground reference - must be low-impedance connection to system ground plane |
| 3 | MR | Debounced manual-reset input - pull low to force reset; internal 32–100kΩ pullup ensures default high state |
| 4 | VCC2 | Secondary supply input and monitor rail - powers device if > VCC1, monitored at 1.58V threshold |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2 - asserts when VCC2 drops below 1.58V |
| 6 | VCC1 | Primary supply input and monitor rail - powers device if > VCC2, monitored at 2.93V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of two non-identical rails (e.g., 3.3V I/O + 1.8V core) without external components |
| Precision factory-set thresholds | 2.93V/1.58V pair with ±0.05V tolerance over full temperature range - eliminates calibration overhead |
| Push-pull reset outputs | Two CMOS-compatible active-low outputs eliminate external pull-up resistors and reduce BOM count |
| Low-power operation | 20µA supply current enables use in always-on, battery-powered, or energy-harvesting applications |
| Robust reset timing | Guaranteed 100ms minimum power-on reset pulse width ensures reliable μP initialization across voltage ramps |
Applications
| Industrial PLC Power Sequencing | Medical Sensor Node Supervision |
|---|---|
|
Use Scenario: A programmable logic controller monitors 24V DC input, 5V logic rail, and 3.3V MCU core - requiring coordinated reset assertion during undervoltage events. IC Role / Device Role / Timing Role: MAX6351SVUT+ supervises dual rails (5V and 3.3V) and generates synchronized active-low reset pulses to both FPGA configuration logic and ARM Cortex-M core. Use Value: Eliminates discrete resistor-divider + comparator solutions while guaranteeing reset validity down to 1.0V on either rail - critical for graceful shutdown during AC dropout. |
Use Scenario: A portable ECG sensor node uses a 3.3V analog front-end and 1.8V digital subsystem powered from a single Li-ion cell with buck-boost regulation. IC Role / Device Role / Timing Role: MAX6351SVUT+ monitors regulated 3.3V (VCC1) and 1.8V (VCC2) outputs, asserting RST1 and RST2 to halt ADC sampling and freeze digital state before brownout. Use Value: 20µA quiescent current extends battery life; push-pull outputs drive multiple loads directly without pull-up loading - reducing leakage paths in ultra-low-power sleep modes. |
| Automotive Body Control Module | Industrial IoT Gateway |
|
Use Scenario: A BCM integrates CAN transceiver, microcontroller, and LIN interface - all requiring stable 5V and 3.3V supplies under load dump and cold-crank conditions. IC Role / Device Role / Timing Role: MAX6351SVUT+ detects dips on 5V main rail (VCC1 = 2.93V threshold) and 3.3V domain (VCC2 = 1.58V threshold), triggering hardware reset before firmware corruption occurs. Use Value: Guaranteed operation from -40°C to +85°C and 20ppm/°C tempco ensure consistent trip points across automotive thermal cycles - meeting AEC-Q100 stress requirements. |
Use Scenario: An edge gateway combines Wi-Fi SoC (3.3V), cellular modem (4.2V), and isolated RS-485 PHY (5V) - requiring independent reset coordination during hot-swap events. IC Role / Device Role / Timing Role: MAX6351SVUT+ supervises 3.3V (VCC1) and 5V (VCC2) rails, using RST1 to hold Wi-Fi SoC in reset until 3.3V stabilizes, and RST2 to delay RS-485 enable until 5V reaches regulation. Use Value: Dual push-pull outputs provide independent control signals with no shared impedance - preventing cross-rail interference during transient coupling on shared PCB planes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353SVUK+ | Single active-low push-pull reset output referenced to VCC1 only; 5-pin SOT23 package; no RST2 output | Suitable for systems needing only one reset signal tied to primary supply - reduces pin count and board area | Select MAX6353SVUK+ when only VCC1 supervision is required and space constraints favor 5-pin layout |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); open-drain reset; requires external pull-up; no dual-rail capability | Limited to single-rail monitoring; lacks independent VCC2 threshold and second reset output | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where dual monitoring is unnecessary |
Compared with MAX6351SVUT+, MAX6353SVUK+ saves board space but sacrifices independent secondary-rail reset control, while TPS3808G33DBVR offers lower unit cost but requires redesign to accommodate open-drain signaling and cannot replace dual-threshold functionality without adding discrete components.
Availability
MAX6351SVUT+ is available at Aetrix Electronics and suitable for industrial PLCs, medical sensor nodes, automotive body control modules, and industrial IoT gateways requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6351SVUT+ 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, computing, and communications applications.
The MAX6351–MAX6360 family was designed to replace discrete supervisory circuits in multivoltage systems - delivering precision dual/three-rail monitoring, low quiescent current, and robust reset timing in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351SVUT+?
The MAX6351SVUT+ has a factory-set VCC1 threshold of 2.93V (±0.05V over -40°C to +85°C) and a VCC2 threshold of 1.58V (±0.05V over the same temperature range), as confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet. These values are laser-trimmed during production and do not require external adjustment.
Does the MAX6351SVUT+ include a watchdog timer function?
No, the MAX6351SVUT+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6351SVUT+ provides only dual-voltage monitoring with manual reset and two independent push-pull reset outputs - RST1 and RST2.
Can the MAX6351SVUT+ operate with supply voltages below 2.0V?
Yes - the MAX6351SVUT+ guarantees functional reset output behavior as long as either VCC1 or VCC2 remains ≥ 1.0V, and its specified operating range starts at VCC1/VCC2 = 1.2V (min) up to 5.5V. This allows use in low-voltage systems such as 1.8V/1.2V dual-rail applications, provided thresholds match (e.g., SV suffix = 2.93V/1.58V).
What is the reset timeout period for the MAX6351SVUT+?
The MAX6351SVUT+ provides a guaranteed reset timeout period of 100ms minimum, 180ms typical, and 280ms maximum after VCC1 or VCC2 rises above its respective threshold. This parameter is fully characterized over temperature and ensures sufficient time for microprocessor initialization before release from reset.
Is the MAX6351SVUT+ pin-compatible with other devices in the MAX6351–MAX6360 family?
The MAX6351SVUT+ uses the 6-pin SOT23 package and shares identical pinout with all other 6-pin variants (e.g., MAX6355, MAX6356, MAX6358), including RST1/RST2/GND/MR/VCC2/VCC1 assignments. However, functional differences exist - e.g., MAX6355 adds RSTIN, MAX6358 adds WDI - so electrical compatibility depends on whether unused pins are properly terminated per each variant's datasheet guidance.
MAX6351SVUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.58V, 2.93V
- 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-6
MAX6351SVUT+ FAQ
1.How can I place an order for MAX6351SVUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351SVUT+ 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 MAX6351SVUT+ reliable?
The price and inventory of MAX6351SVUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351SVUT+ is usually 5 days.
3.What payment methods are accepted for MAX6351SVUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351SVUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351SVUT+?
MAX6351SVUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351SVUT+ 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 MAX6351SVUT+?
For technical support, including MAX6351SVUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351SVUT+ requirements.
6.How does Aetrix verify that MAX6351SVUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6351SVUT+ 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 MAX6351SVUT+ meets industry standards.
7.What is the process for return or replacement of MAX6351SVUT+?
All MAX6351SVUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351SVUT+, 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 MAX6351SVUT+ part is unused and in its original packaging.
Return procedure for MAX6351SVUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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