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Analog Devices Inc./Maxim Integrated MAX6333UR19D3-T
- Part No.:
- MAX6333UR19D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR19D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
The MAX6333UR19D3-T 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 supply drops below 1.90V (±1.8% at +25°C), maintains reset for ≥100ms after VCC recovers, operates down to 0.7V, draws only 3.3µA at 2.5V, and is used in portable equipment requiring ultra-low-voltage brownout protection.
For engineers reviewing the MAX6333UR19D3-T datasheet, MAX6333UR19D3-T pinout, MAX6333UR19D3-T application, or MAX6333UR19D3-T equivalent, key selection criteria include guaranteed reset validity to 0.7V, factory-trimmed 1.90V threshold with ±3% temp drift, 100ms min timeout, push/pull output drive capability, and SOT23-3 footprint compatibility with MAX809/MAX6326 families.
Technical Context
This device implements a precision bandgap-based voltage comparator with hysteresis and an internal timer for fixed reset timeout. The reset assertion logic is purely analog-no internal oscillator or digital state machine-and the push/pull output stage delivers defined VOH (≥0.8×VCC) and VOL (≤0.3V at ISINK = 500µA, VCC ≥ 1.8V).
It features transient immunity via comparator overdrive tolerance: a 20mV drop in VCC can survive up to ~100µs without triggering reset, while larger transients (e.g., 100mV) are limited to <10µs. Reset timeout stability is maintained across –40°C to +125°C with ≤±10% variation relative to nominal 100ms value.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.90V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures reliable brownout detection for 1.8V systems with margin |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP initialization and memory stabilization |
| Supply Voltage Range | 0.7V to 5.5V - supports operation during deep brownout and full-system power-up sequencing |
| Supply Current | 3.3µA typical at 2.5V - enables multi-year battery life in always-on monitoring applications |
| Output Type | Active-low push/pull - drives RESET line directly without external pull-up; sinks 500µA at VOL ≤0.3V |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Propagation Delay | 24µs max at 10V/ms VCC fall rate - fast response to rapid supply collapse |
Pinout & Package
MAX6333UR19D3-T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051), 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 |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| RESET (Pin 2) | Active-low reset output | Push/pull driver asserts logic-low during VCC fault and 100ms timeout; compatible with standard μP reset inputs without pull-up |
| VCC (Pin 3) | Supply input | Power source for internal circuitry; accepts 0.7V–5.5V; powers both monitoring and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 0.7V operating voltage | Enables valid reset assertion even during severe brownout-critical for fail-safe shutdown in battery-powered systems |
| Factory-trimmed 1.90V threshold | Eliminates external resistor networks; achieves ±1.8% accuracy at room temperature for precise 1.8V rail monitoring |
| 100ms minimum reset timeout | Meets JEDEC JESD8-12B requirements for μP power-on reset duration in embedded controllers and IoT edge nodes |
| 3.3µA supply current at 2.5V | Reduces quiescent load on coin-cell or energy-harvesting supplies by >90% versus legacy reset ICs |
| SOT23-3 package with 0.95mm height | Minimizes PCB area and profile-ideal for wearables, medical patches, and space-constrained modules |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless temperature sensor powered by a CR2032 coin cell must maintain accurate reset behavior across 0.9V–3.0V battery discharge range. IC Role / Device Role / Timing Role: MAX6333UR19D3-T acts as primary brownout detector and power-on reset generator, asserting RESET until VCC exceeds 1.90V and remains stable for ≥100ms. Use Value: Guarantees MCU boot integrity down to 0.7V supply, enabling reliable wake-from-sleep recovery and eliminating firmware lockups due to marginal VCC. |
Use Scenario: An isolated digital input module in a factory automation controller requires robust reset signaling despite 200mV AC-coupled noise on its 2.5V logic rail. IC Role / Device Role / Timing Role: MAX6333UR19D3-T provides noise-immune reset supervision, rejecting transients <100µs wide at 20mV amplitude while holding reset for full 100ms timeout. Use Value: Prevents spurious resets caused by EMI or switching noise-ensuring deterministic PLC scan cycle execution and I/O state consistency. |
| Automotive Body Control Module | Portable Medical Diagnostic Device |
Use Scenario: A BCM microcontroller must survive cold-crank events where battery voltage dips to 0.8V for 500ms before recovering. IC Role / Device Role / Timing Role: MAX6333UR19D3-T remains functional at 0.7V, detects the 0.8V dip, and holds RESET asserted throughout the entire event plus 100ms recovery window. Use Value: Eliminates need for external undervoltage lockout (UVLO) circuitry-reducing BOM count and improving cold-crank reliability per ISO 16750-2. |
Use Scenario: A handheld ECG monitor uses a single-cell Li-ion battery (2.8V–4.2V) with a 1.8V LDO supplying its signal chain; reset must trigger before ADC reference collapses. IC Role / Device Role / Timing Role: MAX6333UR19D3-T monitors the 1.8V LDO output, asserting RESET when it falls below 1.90V-providing early warning of impending analog subsystem failure. Use Value: Enables graceful shutdown and data save before critical analog rails become unstable-meeting IEC 62304 safety requirement for diagnostic integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT20D3-T | Same SOT23-3, 2.0V reset threshold, 100ms timeout, push/pull active-low; higher ICC (5µA typ at 2.5V) | Designed for 2.0V–2.5V systems; less suitable for 1.8V rails where tighter threshold margin is required | Select when system VCC nominal is ≥2.0V and 2.0V trip point provides better noise margin against ripple |
| TPS3808G19DBVR | 2.0V threshold (±0.5%), 100ms timeout, open-drain output; lower ICC (1.8µA), but requires external pull-up | Open-drain architecture allows wired-OR reset bus sharing; not pin-compatible due to different pinout (GND/OUT/VCC vs. GND/RESET/VCC) | Choose for multi-source reset arbitration or when lowest possible quiescent current is mandatory |
Compared with MAX6333UR19D3-T, MAX6327UT20D3-T offers higher threshold accuracy but lacks 1.90V granularity and has higher supply current, while TPS3808G19DBVR trades push/pull simplicity for system-level flexibility and lower ICC-but demands layout changes and external components.
Availability
MAX6333UR19D3-T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6333UR19D3-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 computing applications.
The MAX633x family delivers ultra-low-voltage, low-power reset supervision for microprocessor-based systems where supply rail integrity and fail-safe startup are mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6333UR19D3-T and how does it vary with temperature?
The MAX6333UR19D3-T has a factory-trimmed nominal reset threshold of 1.90V at +25°C, with tolerance of ±1.8% at room temperature and ±3% over the full –40°C to +125°C operating range. This means the actual trip point stays between 1.84V and 1.96V across temperature, ensuring consistent brownout detection for 1.8V systems without external calibration.
Does MAX6333UR19D3-T support operation during cold-crank conditions in automotive applications?
Yes, MAX6333UR19D3-T is fully specified down to 0.7V supply voltage and operates reliably at VCC = 0.78V minimum over –40°C to +85°C-covering typical automotive cold-crank profiles. Its guaranteed reset assertion down to 0.7V and 100ms timeout ensure the connected microcontroller remains held in reset until stable power is restored.
Can MAX6333UR19D3-T replace MAX809 in an existing design?
Yes, MAX6333UR19D3-T is explicitly pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the SOT23-3 package. Both share identical pinout (GND/RESET/VCC), active-low push/pull output, and similar timing-making it a direct drop-in upgrade with improved 0.7V operation and tighter 1.90V threshold accuracy.
What is the maximum load the RESET output of MAX6333UR19D3-T can drive?
The RESET output of MAX6333UR19D3-T is a push/pull driver capable of sinking 500µA while maintaining VOL ≤0.3V (at VCC ≥ 1.8V) and sourcing 200µA while delivering VOH ≥0.8×VCC. This supports direct connection to most μP reset inputs without external pull-up resistors, including those with high-impedance CMOS inputs.
How does MAX6333UR19D3-T handle fast transients on the VCC line?
MAX6333UR19D3-T incorporates comparator hysteresis and transient rejection logic that ignores negative-going VCC glitches shorter than ~100µs at 20mV amplitude. As shown in the "Maximum Transient Duration vs. Reset Comparator Overdrive" curve, larger transients require proportionally shorter durations to avoid false reset-ensuring robust operation in noisy power environments.
MAX6333UR19D3-T 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.9V
- 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
MAX6333UR19D3-T FAQ
1.How can I place an order for MAX6333UR19D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR19D3-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 MAX6333UR19D3-T reliable?
The price and inventory of MAX6333UR19D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR19D3-T is usually 5 days.
3.What payment methods are accepted for MAX6333UR19D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR19D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6333UR19D3-T?
MAX6333UR19D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR19D3-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 MAX6333UR19D3-T?
For technical support, including MAX6333UR19D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR19D3-T requirements.
6.How does Aetrix verify that MAX6333UR19D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6333UR19D3-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 MAX6333UR19D3-T meets industry standards.
7.What is the process for return or replacement of MAX6333UR19D3-T?
All MAX6333UR19D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR19D3-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 MAX6333UR19D3-T part is unused and in its original packaging.
Return procedure for MAX6333UR19D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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