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Analog Devices Inc./Maxim Integrated MAX6333UR18D3+T
- Part No.:
- MAX6333UR18D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR18D3+T.pdf
- Description:
- IC MPU/RESET CIRC 1.80V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
MAX6333UR18D3+T from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit designed for 1.8V power supply monitoring in space-constrained embedded systems. It asserts RESET when VCC falls below 1.80V (±1.8% at +25°C), maintains reset for ≥100ms after VCC recovers, operates down to 0.7V supply, draws only 3.0–6.0µA at 1.8V, and is housed in a 3-pin SOT23 package for portable and battery-powered equipment.
For engineers reviewing the MAX6333UR18D3+T datasheet, MAX6333UR18D3+T pinout, MAX6333UR18D3+T application, or MAX6333UR18D3+T equivalent, key selection criteria include guaranteed RESET validity to 0.7V, factory-trimmed 1.8V threshold with ±3% tempco, 100ms minimum timeout, ultra-low ICC, and SOT23-3 footprint compatibility with MAX809/MAX6326 families.
Technical Context
The MAX6333UR18D3+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-set 1.80V threshold. Its internal timer generates a fixed ≥100ms reset pulse after VCC rises above threshold, independent of external components.
It features push/pull output drive capable of sourcing ≥200µA at 0.8×VCC and sinking ≥500µA at ≤0.3V, with guaranteed logic state integrity down to VCC = 0.7V - critical for brownout detection in low-voltage μP systems operating near 1.8V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.80V ±1.8% at +25°C; ±3% over -40°C to +125°C - ensures accurate 1.8V supply monitoring across industrial temperature range |
| Reset Timeout Period | ≥100ms - provides sufficient hold time for full μP initialization after power recovery |
| Supply Voltage Range | 0.7V to 5.5V - supports operation during deep brownout and compatibility with 1.8V/2.5V/3.3V systems |
| Supply Current (ICC) | 3.0–6.0µA at VCC = 1.8V - enables multi-year battery life in portable instrumentation |
| RESET Output Type | Active-low push/pull - eliminates need for external pull-up resistor and ensures fast, low-impedance reset assertion |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Falling Propagation Delay | 24µs at 10V/ms - rejects sub-25µs transients, preventing false resets from switching noise |
Pinout & Package
MAX6333UR18D3+T is supplied in a RoHS-compliant, lead-free 3-pin SOT23-3 package (outline 21-0051) with standard land pattern 90-0179. The compact 2.92mm × 1.3mm footprint supports high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push/pull output; drives low during reset condition and high otherwise; compatible with CMOS μP reset inputs |
| 3 | VCC | Power supply input; monitors this rail for undervoltage; functional down to 0.7V with guaranteed output state |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.8V threshold | 1.80V ±1.8% at +25°C ensures precise match to 1.8V I/O domain without calibration |
| 100ms minimum reset timeout | Guarantees μP core and peripherals fully stabilize before release - no external timing capacitor required |
| 0.7V minimum operating voltage | Enables reliable reset assertion even during severe brownout conditions where VCC dips near silicon threshold |
| 3.3µA typical supply current | Reduces quiescent load on coin-cell or energy-harvesting power sources in always-on monitoring applications |
| Transient immunity | Rejects VCC glitches <24µs wide - prevents false resets from digital switching noise or ESD-induced supply perturbations |
Applications
| Industrial PLC Controllers | Portable Medical Sensors |
|---|---|
Use Scenario: Microcontroller-based programmable logic controllers deployed in factory automation require deterministic reset behavior during line-voltage sags. IC Role / Device Role / Timing Role: Supervises 1.8V core supply and asserts active-low RESET to hold ARM Cortex-M4 in reset until stable. Use Value: Guaranteed 0.7V operation ensures reset remains valid during 30% AC line drop; 100ms timeout accommodates FPGA configuration time. |
Use Scenario: Wearable ECG patch monitors patient heart activity continuously using a low-power MCU powered by a CR2032 coin cell. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output feeding the MCU's I/O domain and triggers reset on battery voltage decay. Use Value: 3.3µA ICC extends battery life beyond 2 years; 1.80V threshold aligns precisely with MCU's minimum I/O voltage spec. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: BCM microcontrollers manage door locks, lighting, and window controls in vehicles exposed to cold cranking (VCC dip to 0.9V). IC Role / Device Role / Timing Role: Provides fail-safe reset signal to Infineon AURIX TC3xx during cold-crank events. Use Value: Valid RESET output down to 0.7V ensures deterministic behavior even below cold-crank spec; -40°C to +125°C rating covers under-hood thermal range. |
Use Scenario: Two-way communication meters log consumption data and transmit via NB-IoT; MCU must survive grid brownouts lasting seconds. IC Role / Device Role / Timing Role: Supervises 1.8V RTC and secure element supply, asserting RESET during sustained undervoltage. Use Value: 100ms timeout exceeds EN 50160 voltage dip duration requirements; SOT23-3 footprint saves space on meter's narrow PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR18D3+T | Same 1.8V threshold and 100ms timeout, but optimized for lower temperature drift (±2% over -40°C to +85°C vs. ±3% for MAX6333) | Limited to commercial temperature range (-40°C to +85°C); not rated for full -40°C to +125°C industrial use | Select when cost sensitivity outweighs extended temperature requirement and tighter drift is needed in ambient-controlled environments |
| TPS3123E18DBVR | 1.8V threshold with 200ms timeout; higher ICC (12µA typical); requires external capacitor for adjustable delay | Not guaranteed below 1.0V VCC; lacks 0.7V brownout coverage; uses SOT23-5 (extra pins for manual reset and watchdog) | Choose when system requires manual reset input or watchdog functionality - not a direct replacement due to different pin count and voltage range |
Compared with MAX6333UR18D3+T, MAX6326UR18D3+T trades extended temperature support for improved threshold stability, while TPS3123E18DBVR adds feature complexity at the cost of higher current and reduced low-VCC robustness - making MAX6333UR18D3+T optimal for space-constrained, ultra-low-voltage brownout protection.
Availability
MAX6333UR18D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical sensors, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6333UR18D3+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, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX633x family delivers ultra-low-voltage, low-power supervisory circuits targeting space- and power-constrained embedded systems requiring deterministic reset behavior during brownout and cold-crank conditions.
FAQ
What is the exact reset threshold voltage for MAX6333UR18D3+T?
The MAX6333UR18D3+T has a factory-trimmed nominal reset threshold of 1.80V, with tolerance of ±1.8% at +25°C and ±3% over the full -40°C to +125°C operating range. This value is verified per Table 1 in the official datasheet and applies specifically to the "UR18" suffix variant of the MAX6333UR18D3+T.
Does MAX6333UR18D3+T support operation below 1.0V supply voltage?
Yes, the MAX6333UR18D3+T is guaranteed to maintain correct RESET output state down to VCC = 0.7V, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables. This capability is unique to the MAX6332/MAX6333 variants and enables reliable brownout detection in ultra-low-voltage systems where other supervisors fail.
What is the reset timeout period for MAX6333UR18D3+T?
The MAX6333UR18D3+T provides a minimum reset timeout period of 100ms, corresponding to the "D3" suffix in its part number. This is a factory-programmed, internally timed delay that begins when VCC rises above the 1.80V threshold and requires no external components - confirmed in the Electrical Characteristics table under tRP for MAX633_UR__D3-T.
Is MAX6333UR18D3+T pin-compatible with MAX809?
Yes, the MAX6333UR18D3+T is explicitly stated in the datasheet to be pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328. All share identical SOT23-3 pinout (VCC, RESET, GND), enabling drop-in replacement in existing layouts without PCB modification - provided the output type (active-low push/pull) and threshold match system requirements.
What package type and RoHS status does MAX6333UR18D3+T use?
The MAX6333UR18D3+T is supplied in a lead-free, RoHS-compliant 3-pin SOT23-3 package (package code U3+1, outline 21-0051). The "+T" suffix denotes lead-free tape-and-reel packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 specifications for reflow soldering up to +260°C.
MAX6333UR18D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.8V
- 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
MAX6333UR18D3+T FAQ
1.How can I place an order for MAX6333UR18D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR18D3+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 MAX6333UR18D3+T reliable?
The price and inventory of MAX6333UR18D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR18D3+T is usually 5 days.
3.What payment methods are accepted for MAX6333UR18D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR18D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6333UR18D3+T?
MAX6333UR18D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR18D3+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 MAX6333UR18D3+T?
For technical support, including MAX6333UR18D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR18D3+T requirements.
6.How does Aetrix verify that MAX6333UR18D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6333UR18D3+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 MAX6333UR18D3+T meets industry standards.
7.What is the process for return or replacement of MAX6333UR18D3+T?
All MAX6333UR18D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR18D3+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 MAX6333UR18D3+T part is unused and in its original packaging.
Return procedure for MAX6333UR18D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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