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Analog Devices Inc./Maxim Integrated MAX6351TZUT+T
- Part No.:
- MAX6351TZUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351TZUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,942
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Product details
Overview
MAX6351TZUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-RST1 referenced to VCC1 and RST2 referenced to VCC2-designed for multivoltage systems requiring precise, independent monitoring of +3.08V and +2.32V supplies. It guarantees RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, features 100ms minimum power-on-reset pulse width, 20µA supply current, and operates across –40°C to +85°C.
For engineers reviewing the MAX6351TZUT+T datasheet, MAX6351TZUT+T pinout, MAX6351TZUT+T application, or MAX6351TZUT+T equivalent, this device serves as a precision dual-threshold supervisor for embedded controllers, portable equipment, and intelligent instrumentation where reliable power sequencing and fault detection are critical.
Technical Context
The MAX6351TZUT+T implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 3.08V ±0.05V, VTH2 = 2.32V ±0.03V) and built-in hysteresis (VTH/500). Its reset generator asserts both RST1 and RST2 simultaneously when either VCC1 drops below VTH1 or VCC2 drops below VTH2, with guaranteed operation down to 1.0V on either supply rail.
It integrates a debounced TTL/CMOS-compatible manual-reset input (MR), supports no external components in dual-supply configurations, and provides transient immunity against short negative-going VCC spikes up to 250µs at 100mV overdrive-enabling robust operation in noisy industrial and battery-powered environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±0.05V at +25°C; ensures reliable reset assertion when primary supply falls below nominal +3.08V rail |
| VCC2 Threshold | 2.32V ±0.03V at +25°C; enables accurate monitoring of secondary +2.32V domain (e.g., I/O or auxiliary logic) |
| Reset Timeout Period | 100–280ms; guarantees minimum 100ms active-low reset pulse for safe μP initialization |
| Supply Current | 20µA typical; minimizes quiescent power draw in always-on supervisory functions |
| Operating Temperature | –40°C to +85°C; qualified for extended industrial and automotive-adjacent applications |
| RESET Output Type | Two active-low push-pull outputs (RST1 @ VCC1, RST2 @ VCC2); eliminates need for external pull-ups and supports direct μP reset pin drive |
| MR Input Compatibility | TTL/CMOS-debounced; accepts standard logic-level manual reset signals without external filtering |
Pinout & Package
MAX6351TZUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 1.0mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height-optimized for space-constrained PCB layouts in portable and multilayer designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives μP reset directly without pull-up resistor |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Debounced manual-reset input; low pulse forces simultaneous RST1/RST2 assertion |
| 4 | VCC2 | Secondary supply input and monitor rail; powers internal circuitry when VCC2 > VCC1 |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; independently controls reset for VCC2-domain peripherals |
| 6 | VCC1 | Primary supply input and monitor rail; powers internal circuitry when VCC1 > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous, non-interacting supervision of two distinct supply rails (VCC1/VCC2) with separate threshold accuracy and hysteresis |
| Guaranteed RESET validity to 1.0V | Ensures functional reset assertion even during deep brownout conditions on either supply-critical for fail-safe shutdown |
| No external components required | Eliminates discrete resistors, capacitors, or diodes in dual-supply reset circuits-reducing BOM count and layout area |
| Power-supply transient immunity | Withstands VCC transients ≤250µs at 100mV overdrive without spurious reset-enhancing reliability in electrically noisy systems |
| Low quiescent current | 20µA typical ICC enables use in battery-backed or energy-harvesting applications with multi-year standby life |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Desktop motherboard with separate +3.3V core and +2.5V I/O rails requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting synchronized RST1/RST2 pulses to ensure CPU and peripheral ICs initialize only after both supplies stabilize. Use Value: Prevents partial initialization and bus contention by guaranteeing both domains meet threshold before release-eliminating boot failures. | Use Scenario: Industrial PLC controller with isolated +3.08V logic and +2.32V sensor interface supplies. IC Role / Device Role / Timing Role: Fault-detection node that monitors dual rails and triggers system-wide reset if either supply sags below specification during operation. Use Value: Enables deterministic recovery from undervoltage events without software intervention-meeting SIL-2 functional safety requirements. |
| Portable/Battery-Powered Equipment | Intelligent Instruments |
Use Scenario: Handheld medical meter powered by single Li-ion cell with DC-DC converters generating +3.08V MCU rail and +2.32V analog front-end rail. IC Role / Device Role / Timing Role: Low-power supervisor ensuring clean reset during battery discharge, cold start, or load-step events. Use Value: 20µA ICC extends battery runtime while maintaining guaranteed reset down to 1.0V per rail-supporting deep brownout tolerance. | Use Scenario: Benchtop digital multimeter with precision ADC reference (+3.08V) and microcontroller core (+2.32V) supplies. IC Role / Device Role / Timing Role: Accuracy-critical supervisor validating both voltage domains before enabling measurement cycles or calibration routines. Use Value: Factory-trimmed ±0.05V VTH1 and ±0.03V VTH2 ensure measurement integrity by preventing operation under out-of-spec supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6351TZUT-T | Same electrical specs and pinout, but leaded (Pb-containing) packaging instead of lead-free (+T suffix) | Not suitable for RoHS-compliant production; requires Pb-based solder process | Select only if legacy assembly line mandates leaded finish and exemption applies |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); lacks second threshold, dual push-pull outputs, and VCC2-referenced RST2 | Cannot replace MAX6351TZUT+T in true dual-rail monitoring-requires redesign to add second supervisor or discrete solution | Use only for single-rail systems where cost or footprint constraints outweigh dual-monitoring need |
Compared with MAX6351TZUT+T, the leaded MAX6351TZUT-T offers identical performance but violates modern environmental compliance, while TPS3808G33DBVR reduces functionality-losing independent VCC2 monitoring and dual push-pull drive-making it unsuitable as a drop-in replacement in multivoltage architectures.
Availability
MAX6351TZUT+T is available at Aetrix Electronics and suitable for computers, controllers, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6351TZUT+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 MAX6351–MAX6360 family was designed specifically for multivoltage embedded systems needing precision, low-power, and highly integrated supervision-addressing reliability gaps in dual-rail computing, instrumentation, and portable electronics.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351TZUT+T?
The MAX6351TZUT+T has factory-set thresholds of 3.08V ±0.05V for VCC1 and 2.32V ±0.03V for VCC2 at +25°C, with temperature coefficients of 20ppm/°C. These values are guaranteed over –40°C to +85°C per the Electrical Characteristics table, and define the precise trip points at which RST1 and RST2 assert.
Does the MAX6351TZUT+T include a watchdog timer function?
No, the MAX6351TZUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6351TZUT+T provides only dual-voltage monitoring, manual reset, and dual push-pull reset outputs-no WDI pin or timeout logic is present.
Can the MAX6351TZUT+T operate with supply voltages below 2.0V?
Yes-the MAX6351TZUT+T guarantees functional reset assertion as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, and its absolute minimum operating supply is 1.2V over temperature. It remains fully specified down to 1.2V for both rails, enabling use in ultra-low-voltage systems such as energy-harvesting nodes or deeply discharged battery applications.
What is the purpose of the two separate reset outputs (RST1 and RST2) on the MAX6351TZUT+T?
RST1 is an active-low push-pull output referenced to VCC1, intended to drive reset lines tied to VCC1-domain devices (e.g., microcontrollers). RST2 is referenced to VCC2 and drives peripherals or logic powered by the secondary rail. This separation ensures correct voltage-level compatibility and prevents contention when VCC1 and VCC2 differ-critical for mixed-voltage SoC interfaces.
Is the MAX6351TZUT+T pin-compatible with other devices in the MAX6351–MAX6360 series?
Yes-the MAX6351TZUT+T uses the standard 6-pin SOT23 pinout shared across all MAX6351, MAX6355–MAX6360 variants. Pin 1 is RST1, Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is RST2, and Pin 6 is VCC1. However, functionality differs: only MAX6351/MAX6355–MAX6360 have Pin 5 as RST2; MAX6358–MAX6360 repurpose it as WDI, so substitution requires verification of feature alignment.
MAX6351TZUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.32V, 3.08V
- 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
MAX6351TZUT+T FAQ
1.How can I place an order for MAX6351TZUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351TZUT+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 MAX6351TZUT+T reliable?
The price and inventory of MAX6351TZUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351TZUT+T is usually 5 days.
3.What payment methods are accepted for MAX6351TZUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351TZUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351TZUT+T?
MAX6351TZUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351TZUT+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 MAX6351TZUT+T?
For technical support, including MAX6351TZUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351TZUT+T requirements.
6.How does Aetrix verify that MAX6351TZUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6351TZUT+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 MAX6351TZUT+T meets industry standards.
7.What is the process for return or replacement of MAX6351TZUT+T?
All MAX6351TZUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351TZUT+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 MAX6351TZUT+T part is unused and in its original packaging.
Return procedure for MAX6351TZUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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