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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 SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,645
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Product details
Overview
MAX6333UR18D3-T from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit in SOT23-3 package, designed for 1.8V power supply monitoring with factory-trimmed 1.80V reset threshold (±1.8% at +25°C, ±3% over -40°C to +125°C), 100ms minimum reset timeout, and guaranteed operation down to VCC = 0.7V. It delivers ultra-low 3.0–6.0µA supply current at 1.8V and provides robust immunity to fast VCC transients.
For engineers reviewing the MAX6333UR18D3-T datasheet, MAX6333UR18D3-T pinout, MAX6333UR18D3-T application, or MAX6333UR18D3-T equivalent, this device serves as a precision, low-power, single-function reset supervisor for space-constrained embedded systems requiring stable brownout detection and reliable power-on reset timing.
Technical Context
The MAX6333UR18D3-T implements a dedicated voltage-monitoring comparator with hysteresis and an internal timer to generate a precise, temperature-stable reset pulse. Its reset assertion logic is strictly tied to VCC falling below 1.80V and remains active for ≥100ms after VCC rises above threshold.
It features a push/pull output stage capable of sourcing ≥200µA at 0.8×VCC and sinking ≥500µA at ≤0.3V, with full specification across -40°C to +125°C and absolute maximum VCC rating up to +6V. No external components are required for basic operation.
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 rail supervision without calibration |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power stabilization |
| Supply Current | 3.0–6.0µA at VCC = 1.8V - enables multi-year battery life in portable equipment |
| Operating VCC Range | 0.7V to 5.5V - supports valid reset assertion during deep brownout and full-system power-up |
| Output Type | Active-low push/pull - drives standard CMOS reset inputs directly without pull-up resistor |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Transient Immunity | Rejects <24µs negative glitches at 10V/ms - prevents false resets from switching noise or ESD coupling |
Pinout & Package
MAX6333UR18D3-T is housed in a 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 = GND, Pin 2 = RESET (active-low push/pull), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground for reset comparator and output driver; must be connected to system ground plane |
| 2 | RESET | Active-low push/pull output; asserts low during VCC undervoltage and for ≥100ms post-recovery |
| 3 | VCC | Power input (0.7V–5.5V); supplies internal regulator, comparator, and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.80V threshold | Eliminates need for external resistive divider or trimming; reduces BOM count and layout area |
| 100ms minimum reset timeout | Meets boot-time requirements of ARM Cortex-M0/M3 and RISC-V microcontrollers without external RC timing |
| 0.7V operating minimum | Ensures deterministic reset behavior during severe brownout conditions where most supervisors fail |
| 3.3µA typical supply current | Enables integration into always-on sensor nodes and energy-harvesting systems |
| SOT23-3 footprint | Provides industry-standard 3-pin supervisory IC packaging compatible with high-speed automated assembly |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Power sequencing and fault recovery in distributed I/O modules exposed to wide ambient temperature swings and noisy 24V DC bus. IC Role / Device Role / Timing Role: Monitors local 1.8V FPGA core supply and asserts hardware reset if voltage drops below 1.80V during load dump or cold-cranking events. Use Value: Prevents configuration corruption in Xilinx Spartan-7 FPGAs by guaranteeing ≥100ms reset hold time after 24V supply stabilizes. |
Use Scenario: Supervising 1.8V microcontroller supply in door module ECUs subject to battery voltage sag during starter engagement. IC Role / Device Role / Timing Role: Detects brownout on 1.8V rail derived from buck converter and holds MCU in reset until VCC recovers and remains stable for ≥100ms. Use Value: Eliminates spurious CAN frame transmission during engine cranking by ensuring clean MCU restart after battery recovery. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Battery-powered glucose monitor with ultra-low-power sleep mode and infrequent wake-up cycles. IC Role / Device Role / Timing Role: Watches primary 1.8V LDO output and forces system reset if coin-cell voltage sags below safe operating level during measurement burst. Use Value: Achieves >5-year shelf life by drawing only 3.3µA continuously while maintaining guaranteed reset validity down to 0.7V. |
Use Scenario: Two-way communication meter with isolated RS-485 interface and tamper-detection circuitry. IC Role / Device Role / Timing Role: Supervises 1.8V supply to metrology ADC and secure element, asserting reset during AC line dropout or surge-induced rail collapse. Use Value: Prevents EEPROM write corruption during power interruption by enforcing 100ms minimum reset assertion before firmware resumes data logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR18D3-T | Same 1.80V threshold and 100ms timeout, but rated only to +85°C; lower ICC (2.5µA typ) | Not qualified for automotive or extended industrial temperature range (-40°C to +125°C) | Select when cost sensitivity outweighs extended temperature requirement and board space allows larger SO-8 package |
| TPS3123E18DBVR | 1.80V threshold, 200ms timeout, 3.5µA ICC, SOT23-3, but requires external capacitor for timeout adjustment | Lacks factory-programmed fixed timeout; introduces tolerance stack-up and PCB area penalty | Choose only if adjustable timeout is needed and design can accommodate external component |
Compared with MAX6333UR18D3-T, MAX6326UR18D3-T sacrifices temperature range for lower quiescent current and higher cost, while TPS3123E18DBVR trades factory-set timing accuracy for configurability-neither offers drop-in replacement capability due to differing temperature specs and timeout architecture.
Availability
MAX6333UR18D3-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and portable medical sensors requiring stable component supply with guaranteed long-term availability and RoHS-compliant lead-free packaging.
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 demanding industrial, automotive, and communications applications.
The MAX6333 series belongs to Maxim's ultra-low-voltage supervisory product line, engineered specifically for reliable reset generation in battery-powered and energy-sensitive systems operating at 1.8V–3.3V rails.
FAQ
What is the exact reset threshold voltage of MAX6333UR18D3-T and how tightly is it specified?
The MAX6333UR18D3-T has a factory-trimmed nominal reset threshold of 1.80V, with a tolerance of ±1.8% at +25°C and ±3% over the full operating temperature range of -40°C to +125°C. This specification is guaranteed per the Electrical Characteristics table in the official datasheet and ensures precise 1.8V rail supervision without external calibration. The MAX6333UR18D3-T achieves this via laser trimming during wafer sort.
Does MAX6333UR18D3-T require any external components to function as a reset supervisor?
No, the MAX6333UR18D3-T operates as a fully self-contained reset supervisor with no external components required. Its internal voltage reference, comparator, and timer are integrated, and the push/pull RESET output drives standard CMOS inputs directly. Unlike open-drain alternatives, MAX6333UR18D3-T eliminates the need for an external pull-up resistor, reducing BOM count and PCB area.
What is the minimum supply voltage at which MAX6333UR18D3-T guarantees correct reset output state?
The MAX6333UR18D3-T guarantees correct RESET output state down to VCC = 0.7V across the full temperature range. This is explicitly stated in the datasheet's Absolute Maximum Ratings and Electrical Characteristics sections. Below 0.7V, the device may not assert or deassert RESET reliably-so MAX6333UR18D3-T is uniquely suited for deep-brownout detection where other supervisors fail.
How does MAX6333UR18D3-T handle fast transients on the VCC supply line?
The MAX6333UR18D3-T incorporates transient-immune comparator design that rejects negative-going VCC glitches shorter than 24µs when slew rate is 10V/ms. This is verified in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph in the datasheet. As a result, MAX6333UR18D3-T avoids false resets caused by switching noise, ESD coupling, or load-step artifacts commonly seen in DC/DC converter outputs.
Is MAX6333UR18D3-T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, MAX6333UR18D3-T is pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the SOT23-3 package. Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC matches exactly. However, MAX6333UR18D3-T offers tighter threshold accuracy (±1.8% vs. ±2.5%), lower ICC (3.3µA vs. 12µA), and guaranteed operation down to 0.7V-making it a functional upgrade without PCB changes.
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:
- Obsolete
- 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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