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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX6333UR16D3

Name: MAX6333UR16D3
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6333UR16D3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6333UR16D3

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MAX6333UR16D3.pdf

Description:: IC SUPERVISOR 1 CHANNEL SOT23-3

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Product details

Overview

MAX6333UR16D3 from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit in SOT23-3 package, designed for 1.8V–3.3V digital systems. It monitors VCC and asserts RESET when voltage drops below 1.60V (±1.8% at +25°C), maintains reset for ≥100ms after recovery, operates down to 0.7V supply, draws only 3.0–6.0µA at 1.8V, and delivers low VOL (0.4V @ 50µA) for reliable µP reset signaling in battery-powered controllers.

For engineers reviewing the MAX6333UR16D3 datasheet, MAX6333UR16D3 pinout, MAX6333UR16D3 application, or MAX6333UR16D3 equivalent, this page provides verified functional identity, exact reset threshold and timeout, guaranteed operation to 0.7V, SOT23-3 terminal mapping, and validated alternatives for critical power-monitoring designs.

Technical Context

The MAX6333UR16D3 implements a precision bandgap-based reset comparator with factory-trimmed 1.60V threshold (±1.8% at +25°C, ±3% over –40°C to +125°C) and a fixed 100ms minimum reset timeout period. Its push/pull output drives RESET low actively during fault and high (0.8×VCC) when deasserted, ensuring deterministic logic levels without external pull-up.

It features ultra-low 3.3µA typical supply current at 3V, immunity to fast VCC transients (<24µs at 10V/ms), and guaranteed RESET validity down to VCC = 0.7V - enabling robust brownout detection in space-constrained embedded systems powered by Li-ion or coin cells.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	1.60V ±1.8% at +25°C; ensures accurate brownout detection for 1.8V logic rails
Reset Timeout Period	≥100ms min; guarantees sufficient processor initialization time after power recovery
Supply Voltage Range	0.7V to 5.5V; supports operation during deep brownout and compatibility with 3.3V/2.5V/1.8V systems
Supply Current	3.0–6.0µA at 1.8V; enables multi-year battery life in portable instrumentation
Output Type	Push/pull active-low RESET; eliminates need for external pull-up resistor and reduces BOM count
Operating Temperature	–40°C to +125°C; qualified for automotive under-hood and industrial control environments
V_OL (RESET asserted)	0.4V max @ 50µA sink; ensures solid logic-low level even with weak drive capability at low V_CC

Pinout & Package

MAX6333UR16D3 is housed in a 3-pin SOT23-3 package (outline 21-0051), with 1.3mm × 2.9mm footprint and gull-wing leads. The package supports automated placement and reflow soldering per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for internal comparator and output stage; must be connected directly to system ground plane
2	RESET	Active-low push/pull reset output; drives low during V_CC undervoltage and for ≥100ms post-recovery
3	V_CC	Power supply input (0.7V–5.5V); powers internal circuitry and defines reset threshold reference

Key Features

Feature	Design Value
Factory-trimmed 1.60V reset threshold	Eliminates external resistor divider and calibration, reducing design cycle time and board area
100ms minimum reset timeout	Guarantees full µP core and peripheral initialization before release, preventing boot failure
0.7V minimum operating voltage	Enables supervision of deeply discharged batteries and ultra-low-power wake-up circuits
3.3µA typical supply current	Extends shelf life and runtime in always-on sensor nodes and IoT edge devices
Transient-immune reset comparator	Rejects <24µs negative V_CC glitches, avoiding spurious resets in noisy power environments

Applications

Pentium® II Computers	Critical μP/μC Power Monitoring
Use Scenario: Power sequencing and brownout protection in legacy desktop motherboards using Pentium II processors. IC Role / Device Role / Timing Role: Monitors 3.3V CPU I/O rail and asserts active-low RESET to halt execution until stable voltage is restored. Use Value: Prevents data corruption and illegal instruction execution during unstable power conditions, leveraging guaranteed 0.7V operation and 100ms timeout.	Use Scenario: Supervising microcontroller supply in industrial PLC modules exposed to wide temperature swings. IC Role / Device Role / Timing Role: Acts as primary power-good monitor for ARM Cortex-M4-based controllers, asserting RESET on V_CC drop below 1.60V. Use Value: Ensures deterministic boot behavior across –40°C to +125°C via ±3% threshold tolerance and fully specified thermal performance.
Portable/Battery-Powered Equipment	Intelligent Instruments
Use Scenario: Battery voltage monitoring in handheld multimeters and portable oscilloscopes with Li-ion cells. IC Role / Device Role / Timing Role: Detects end-of-discharge (≈1.6V) and holds µC in reset to prevent erratic analog front-end operation. Use Value: Achieves >5-year shelf life using only 3.3µA quiescent current and eliminates need for external components in compact SOT23 layout.	Use Scenario: Power supervision in laboratory-grade digital calibrators requiring traceable reset timing. IC Role / Device Role / Timing Role: Provides calibrated 100ms reset pulse synchronized to power-up of precision DACs and ADCs. Use Value: Delivers metrology-grade reliability with factory-trimmed 1.60V threshold and <24µs glitch rejection, meeting IEC 61000-4-4 compliance requirements.

Pentium® II Computers

Critical μP/μC Power Monitoring

Use Scenario: Power sequencing and brownout protection in legacy desktop motherboards using Pentium II processors.

IC Role / Device Role / Timing Role: Monitors 3.3V CPU I/O rail and asserts active-low RESET to halt execution until stable voltage is restored.

Use Value: Prevents data corruption and illegal instruction execution during unstable power conditions, leveraging guaranteed 0.7V operation and 100ms timeout.

Use Scenario: Supervising microcontroller supply in industrial PLC modules exposed to wide temperature swings.

IC Role / Device Role / Timing Role: Acts as primary power-good monitor for ARM Cortex-M4-based controllers, asserting RESET on V_CC drop below 1.60V.

Use Value: Ensures deterministic boot behavior across –40°C to +125°C via ±3% threshold tolerance and fully specified thermal performance.

Portable/Battery-Powered Equipment

Intelligent Instruments

Use Scenario: Battery voltage monitoring in handheld multimeters and portable oscilloscopes with Li-ion cells.

IC Role / Device Role / Timing Role: Detects end-of-discharge (≈1.6V) and holds µC in reset to prevent erratic analog front-end operation.

Use Value: Achieves >5-year shelf life using only 3.3µA quiescent current and eliminates need for external components in compact SOT23 layout.

Use Scenario: Power supervision in laboratory-grade digital calibrators requiring traceable reset timing.

IC Role / Device Role / Timing Role: Provides calibrated 100ms reset pulse synchronized to power-up of precision DACs and ADCs.

Use Value: Delivers metrology-grade reliability with factory-trimmed 1.60V threshold and <24µs glitch rejection, meeting IEC 61000-4-4 compliance requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX809TRD3-T	1.63V reset threshold (±2.5%), 240ms timeout, same SOT23-3 package	Longer timeout may delay system startup; higher threshold reduces margin for 1.8V rail monitoring	Select when longer reset hold time is required and 1.63V threshold aligns with system margin analysis
TPS3808G16DBVR	1.60V threshold (±0.5%), 200ms timeout, 1.5µA ICC, but requires external capacitor for timeout setting	Lower ICC improves battery life, but added capacitor increases BOM and layout complexity	Select when ultra-low current dominates design priority and board space allows for external timing component

Compared with MAX809TRD3-T and TPS3808G16DBVR, the MAX6333UR16D3 offers tighter threshold accuracy than MAX809 while maintaining fixed 100ms timeout and zero external components - making it optimal for cost-sensitive, space-constrained 1.8V systems where predictable, minimal reset duration is critical.

Availability

MAX6333UR16D3 is available at Aetrix Electronics and suitable for Pentium® II computers, critical μP/μC power monitoring, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6333UR16D3 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 computing applications.

The MAX6332/MAX6333/MAX6334 family was engineered for ultra-low-voltage microprocessor supervision in space- and power-constrained systems, delivering precision reset functionality without external components.

FAQ

What is the exact reset threshold voltage of MAX6333UR16D3?

The MAX6333UR16D3 has a factory-trimmed nominal reset threshold of 1.60V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "UR16" suffix variant of the MAX6333UR16D3.

Does MAX6333UR16D3 require any external components to function?

No, the MAX6333UR16D3 operates autonomously with no external components required. Its reset threshold is factory-trimmed, timeout is internally fixed at ≥100ms, and the push/pull output eliminates the need for a pull-up resistor - enabling true 3-pin simplicity in the SOT23-3 package.

What is the minimum supply voltage at which MAX6333UR16D3 guarantees correct RESET output behavior?

The MAX6333UR16D3 guarantees correct RESET assertion and deassertion down to V_CC = 0.7V, as explicitly stated in the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable brownout detection even during deep discharge of single-cell Li-ion or alkaline batteries.

How does the reset timeout period of MAX6333UR16D3 compare to other variants in the family?

The "D3" suffix in MAX6333UR16D3 denotes a nominal 100ms minimum reset timeout period. Other variants include D1 (1ms min) and D2 (20ms min). All timeouts are factory-programmed, temperature-stable, and do not require external timing components - unlike adjustable supervisors that rely on RC networks.

Is MAX6333UR16D3 pin-compatible with older Maxim reset ICs like MAX809?

Yes, the MAX6333UR16D3 is pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the SOT23-3 package, sharing identical pin 1 (GND), pin 2 (RESET), and pin 3 (V_CC) assignments. This allows direct replacement in existing layouts without PCB modification.

MAX6333UR16D3 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:: Active

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 1.6V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 100ms Minimum

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MAX6333UR16D3 FAQ

1.How can I place an order for MAX6333UR16D3 through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6333UR16D3 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 MAX6333UR16D3 reliable?

The price and inventory of MAX6333UR16D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR16D3 is usually 5 days.

3.What payment methods are accepted for MAX6333UR16D3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR16D3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6333UR16D3?

MAX6333UR16D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6333UR16D3 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 MAX6333UR16D3?

For technical support, including MAX6333UR16D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR16D3 requirements.

6.How does Aetrix verify that MAX6333UR16D3 is sourced from the original manufacturer or authorized distributors?

All MAX6333UR16D3 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 MAX6333UR16D3 meets industry standards.

7.What is the process for return or replacement of MAX6333UR16D3?

All MAX6333UR16D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR16D3, 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 MAX6333UR16D3 part is unused and in its original packaging.

Return procedure for MAX6333UR16D3:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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