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Analog Devices Inc./Maxim Integrated MAX6333UR20D3
- Part No.:
- MAX6333UR20D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR20D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
MAX6333UR20D3 from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 1.8V–3.3V power supplies with factory-trimmed 2.00V reset threshold (±1.8% at +25°C, ±3% over -40°C to +125°C), 100ms minimum reset timeout, and guaranteed RESET validity down to VCC = 0.7V. It ensures reliable power-on/brownout reset for embedded controllers and battery-powered instrumentation.
For engineers reviewing the MAX6333UR20D3 datasheet, MAX6333UR20D3 pinout, MAX6333UR20D3 application, or MAX6333UR20D3 equivalent, key selection criteria include its ultra-low 3.3μA supply current at 1.8V, 0.4V max RESET output low voltage at 50µA sink, immunity to sub-24µs VCC transients, and compatibility with space-constrained 3-pin SOT23 layouts.
Technical Context
The MAX6333UR20D3 implements a precision bandgap-based reset comparator with factory-trimmed 2.00V threshold and hysteresis optimized for stable operation across -40°C to +125°C. Its internal timer generates a fixed 100ms minimum active-low reset pulse after VCC rises above threshold.
Designed as a single-function supervisory IC, it requires no external components and features push/pull output drive capable of sourcing ≥200µA and sinking ≥500µA while maintaining VOH ≥0.8×VCC and VOL ≤0.4V - enabling direct interface with CMOS inputs without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.00V ±1.8% at +25°C; ±3% over full temperature range - ensures accurate brownout detection for 2.0V nominal rails |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power stabilization |
| Supply Current | 3.3µA typical at VCC = 1.8V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 0.7V to 5.5V - supports valid reset assertion during deep brownout down to near-zero VCC |
| RESET Output Type | Active-low push/pull - eliminates need for external pull-up resistor and reduces BOM count |
| VCC Transient Immunity | Rejects negative glitches <24µs at 10V/ms - prevents false resets from switching noise or ESD events |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
SOT23-3 package: 1.45mm × 1.45mm × 1.1mm body, 0.95mm pitch, gull-wing leads. RoHS-compliant, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output driver - must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push/pull output - asserts logic-low during reset condition and drives high when VCC is stable above 2.00V |
| 3 | VCC | Power supply input - powers internal circuitry and defines reset threshold reference; accepts 0.7V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low operating supply voltage | Guaranteed functional reset assertion down to VCC = 0.7V - critical for Li-ion battery discharge monitoring |
| Precision factory-trimmed threshold | 2.00V ±1.8% at room temperature - eliminates calibration overhead in production test |
| No external components required | Self-contained reset generation with integrated timer and comparator - reduces PCB area by >2mm² vs discrete solutions |
| Three standard timeout options | 100ms minimum pulse width - matches boot-time requirements of ARM Cortex-M and RISC-V microcontrollers |
| High noise immunity | Rejects VCC transients <24µs duration - avoids spurious resets in electrically noisy motor-control or power-conversion systems |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Microcontroller-based programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 3.3V rails. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset during undervoltage conditions on the 3.3V supply rail. Use Value: Prevents erratic firmware execution during brownout by guaranteeing 100ms reset hold time and validating RESET down to 0.7V VCC. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring multi-year operation on coin-cell or Li-Po batteries. IC Role / Device Role / Timing Role: Power-on reset generator and low-voltage detector for ARM Cortex-M0+ host MCU. Use Value: Enables reliable startup and graceful shutdown using only 3.3µA quiescent current and 2.00V precise threshold aligned with battery discharge curve. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Under-hood BCMs exposed to wide temperature swings (-40°C to +125°C) and load-dump transients. IC Role / Device Role / Timing Role: Reset supervisor ensuring MCU reset integrity during cold-crank and ignition cycling. Use Value: Maintains ±3% threshold accuracy across full automotive temperature range and rejects sub-24µs VCC glitches from alternator ripple. |
Use Scenario: DIN-rail mounted electricity meters with isolated 3.3V logic supply derived from mains via flyback converter. IC Role / Device Role / Timing Role: Brownout detector for metering SoC during grid voltage sags below 190VAC. Use Value: Provides deterministic 100ms reset pulse synchronized to 2.00V rail collapse, preventing corrupted flash writes during power interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR20D3-T | Same 2.00V threshold and 100ms timeout, but specified only to +85°C ambient; lower max operating temperature | Not qualified for automotive or extended industrial use above +85°C | Select MAX6333UR20D3-T when full -40°C to +125°C operation is required |
| TPS3808G18DBVR | 2.0V threshold with ±0.5% initial accuracy, 200ms default timeout (adjustable), higher 8µA ICC at 1.8V | Requires external capacitor for timeout adjustment; tighter threshold tolerance but higher quiescent current | Choose TPS3808G18DBVR only if ±0.5% threshold accuracy outweighs 2.4× higher supply current |
Compared with MAX6326UR20D3-T and TPS3808G18DBVR, the MAX6333UR20D3 offers superior temperature range coverage, lowest quiescent current, and zero-component integration - making it optimal for space- and power-constrained designs where 100ms fixed timeout suffices.
Availability
MAX6333UR20D3 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6333UR20D3 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, communications, and computing markets.
The MAX6333 series belongs to Maxim's ultra-low-voltage supervisory product line, engineered specifically for reliable reset generation in battery-powered and thermally demanding embedded systems with minimal external components.
FAQ
What is the exact reset threshold voltage of MAX6333UR20D3 and how tightly is it specified?
The MAX6333UR20D3 has a factory-trimmed nominal reset threshold of 2.00V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This specification ensures consistent brownout detection across temperature extremes without requiring external calibration, and is verified per Maxim's production test flow for every unit shipped as MAX6333UR20D3.
Does MAX6333UR20D3 require any external components to function as a reset supervisor?
No, the MAX6333UR20D3 operates as a fully self-contained reset supervisor with no external components required. Its internal precision comparator, voltage reference, and 100ms timeout timer eliminate the need for external resistors, capacitors, or diodes - reducing bill-of-materials cost and PCB footprint versus discrete reset solutions.
What is the minimum supply voltage at which MAX6333UR20D3 guarantees valid RESET output behavior?
The MAX6333UR20D3 guarantees correct RESET output state down to VCC = 0.7V across the full -40°C to +125°C temperature range. Below this voltage, the device may not assert or deassert RESET reliably; however, most target microcontrollers cease operation well above 0.7V, making this specification sufficient for safe brownout response.
How does the push/pull output of MAX6333UR20D3 differ from open-drain alternatives like MAX6334UR20D3?
The MAX6333UR20D3 features an active-low push/pull RESET output that actively drives both high and low states, eliminating the need for an external pull-up resistor. In contrast, the MAX6334UR20D3 uses an open-drain output requiring a pull-up to define the high state - making MAX6333UR20D3 preferable for designs minimizing external components and reducing standby current.
Is MAX6333UR20D3 compatible with common 3-pin SOT23 footprints used for reset supervisors?
Yes, the MAX6333UR20D3 uses the standard SOT23-3 package (outline 21-0051) with 0.95mm lead pitch and 1.45mm × 1.45mm body size. It is pin-compatible with industry-standard reset ICs including MAX809/MAX810 and MAX6326/MAX6327/MAX6328, enabling drop-in replacement in existing layouts without PCB revision.
MAX6333UR20D3 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:
- 2V
- 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
MAX6333UR20D3 FAQ
1.How can I place an order for MAX6333UR20D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR20D3 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 MAX6333UR20D3 reliable?
The price and inventory of MAX6333UR20D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR20D3 is usually 5 days.
3.What payment methods are accepted for MAX6333UR20D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR20D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6333UR20D3?
MAX6333UR20D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR20D3 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 MAX6333UR20D3?
For technical support, including MAX6333UR20D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR20D3 requirements.
6.How does Aetrix verify that MAX6333UR20D3 is sourced from the original manufacturer or authorized distributors?
All MAX6333UR20D3 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 MAX6333UR20D3 meets industry standards.
7.What is the process for return or replacement of MAX6333UR20D3?
All MAX6333UR20D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR20D3, 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 MAX6333UR20D3 part is unused and in its original packaging.
Return procedure for MAX6333UR20D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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