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Analog Devices Inc./Maxim Integrated MAX6333UR23D3+T
- Part No.:
- MAX6333UR23D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR23D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
MAX6333UR23D3+T from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 1.8V–3.3V power rails with factory-trimmed 2.30V reset threshold (±1.8% at +25°C, ±3% over –40°C to +125°C), 100ms minimum reset timeout, and guaranteed operation down to 0.7V VCC. It ensures reliable power-on/brownout reset for embedded controllers and battery-powered instrumentation.
For engineers reviewing the MAX6333UR23D3+T datasheet, MAX6333UR23D3+T pinout, MAX6333UR23D3+T application, or MAX6333UR23D3+T equivalent, key selection criteria include ultra-low supply voltage support (0.7V), 3.3µA typical supply current at 1.8V, open-drain compatibility via internal push/pull drive, transient-immune reset comparator, and SOT23-3 footprint compatibility with MAX809/MAX6326 families.
Technical Context
The MAX6333UR23D3+T implements a precision bandgap-based reset comparator with factory-trimmed 2.30V threshold and hysteresis optimized for immunity to fast VCC transients (e.g., <24µs propagation delay on 10V/ms falling edge). Its push/pull output drives RESET low during undervoltage and holds it low for ≥100ms after VCC recovers above threshold.
It operates across –40°C to +125°C with full electrical specification, draws only 3.0–6.0µA at 1.8V, and maintains valid RESET assertion down to VCC = 0.7V - critical for low-voltage brownout detection in portable systems where supply collapse must trigger controlled shutdown before logic corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.30V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures accurate 2.3V rail monitoring without external calibration |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP initialization after power recovery |
| Supply Voltage Range | 0.7V to 5.5V - supports operation during deep brownout and enables use with 1.8V/2.5V/3.3V systems |
| Supply Current | 3.0µA (typ) at VCC = 1.8V - minimizes battery drain in always-on monitoring applications |
| Output Type | Active-low push/pull - eliminates need for external pull-up resistor and provides strong low-state drive (≤0.3V at 500µA sink) |
| VCC Propagation Delay | 24µs max (VCC falling at 10V/ms) - rejects short-duration supply glitches without false resets |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6333UR23D3+T is housed in a RoHS-compliant, lead-free 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and reflow soldering (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage; must be connected directly to system ground plane |
| 2 | RESET | Active-low push/pull output; sinks current when asserted (low), sources weakly when deasserted (high); no external pull-up required |
| 3 | VCC | Power supply input (0.7V–5.5V); powers internal comparator and output driver; decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low operating voltage | Functional down to 0.7V VCC - enables reset assertion during severe brownout before logic failure |
| Factory-trimmed precision threshold | 2.30V ±1.8% at +25°C - eliminates external resistor network and improves BOM simplicity |
| Transient-immune comparator | Rejects <24µs negative VCC glitches - prevents spurious resets in noisy power environments |
| Low quiescent current | 3.3µA typical at 2.5V - extends battery life in portable medical and sensor devices |
| SOT23-3 footprint compatibility | Pins match MAX809/MAX6326 series - allows drop-in replacement without layout change |
Applications
| Battery-Powered Instrumentation | Industrial Microcontroller Supervision |
|---|---|
Use Scenario: Portable gas detector with Li-ion battery that discharges from 4.2V to 2.8V; requires reliable reset if voltage drops below 2.3V during cold operation. IC Role / Device Role / Timing Role: Primary brownout detector asserting active-low RESET to ARM Cortex-M0 until VCC recovers above 2.30V and holds for ≥100ms. Use Value: Prevents firmware crash during partial discharge by guaranteeing reset validity down to 0.7V VCC and rejecting transient noise on battery line. |
Use Scenario: PLC I/O module powered by isolated 3.3V DC-DC converter subject to EMI-induced supply dips. IC Role / Device Role / Timing Role: Dedicated supervisor IC monitoring 3.3V rail; triggers hardware reset of STM32F4 MCU upon sustained undervoltage. Use Value: Ensures deterministic restart after power disturbance using 24µs glitch rejection and –40°C to +125°C guaranteed operation. |
| Automotive Body Control Module | Medical Wearable Sensor Hub |
Use Scenario: BCM microcontroller powered from vehicle battery (9V–16V) via 3.3V LDO; must survive cold-crank events where VCC dips to 1.8V. IC Role / Device Role / Timing Role: Reset generator asserting low during cranking-induced brownout and holding reset for 100ms post-recovery to stabilize MCU clock domain. Use Value: Maintains functional safety integrity by asserting valid RESET even as VCC falls to 0.7V - meeting ISO 16750-2 pulse 4 requirements. |
Use Scenario: ECG patch with coin-cell battery (1.5V nominal) and buck-boost regulator delivering 1.8V to ultra-low-power SoC. IC Role / Device Role / Timing Role: Power-good monitor ensuring SoC remains held in reset until regulated 1.8V rail stabilizes above 2.30V threshold. Use Value: Eliminates startup race conditions using 3.3µA supply current and precise 2.30V trip point - extending single-charge runtime by >12 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT23D3+T | Same SOT23-3 package, 2.30V threshold, 100ms timeout, but open-drain output requiring external pull-up | Limited to systems with bidirectional or open-drain-compatible reset inputs (e.g., legacy 68HC11) | Select when interfacing with microcontrollers requiring wired-OR reset topology or shared reset bus |
| TPS3123E18DBVR | 2.32V threshold (±0.5%), 200ms timeout, 1.8V–6V supply, but higher 8µA ICC and no sub-1V operation | Not suitable for deep-brownout detection below 1.0V; better for stable 3.3V systems needing tighter threshold tolerance | Choose when absolute threshold accuracy outweighs ultra-low-VCC operation and supply current |
Compared with MAX6333UR23D3+T, MAX6327UT23D3+T offers identical timing and threshold but requires external biasing, while TPS3123E18DBVR trades ultra-low-voltage capability for improved threshold precision and longer timeout - making MAX6333UR23D3+T optimal for battery-constrained, wide-input-range designs.
Availability
MAX6333UR23D3+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial microcontroller supervision, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6333UR23D3+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 and mixed-signal ICs for power, sensing, and interface applications - emphasizing reliability, integration, and performance in harsh environments.
The MAX633x family delivers ultra-low-voltage microprocessor supervisory circuits targeting space-constrained, battery-operated, and automotive-grade systems where robust brownout detection and minimal quiescent power are essential.
FAQ
What is the exact reset threshold voltage for MAX6333UR23D3+T and how does it vary with temperature?
The MAX6333UR23D3+T has a factory-trimmed nominal reset threshold of 2.30V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This means the actual trip point stays within 2.23V–2.37V across temperature, ensuring consistent 2.3V rail monitoring without recalibration. The MAX6333UR23D3+T achieves this using laser-trimmed internal resistors and a stable bandgap reference.
Does MAX6333UR23D3+T require an external pull-up resistor on the RESET pin?
No, MAX6333UR23D3+T uses a push/pull output structure, so it actively drives RESET low during reset and high when deasserted - eliminating the need for an external pull-up resistor. This reduces BOM count and avoids weak pull-up issues at low VCC. The MAX6333UR23D3+T can source up to 200µA at 0.8×VCC and sink 500µA to 0.3V, ensuring robust interface with standard CMOS inputs.
Can MAX6333UR23D3+T operate reliably when VCC drops below 1.0V?
Yes, MAX6333UR23D3+T is guaranteed to maintain correct reset state down to VCC = 0.7V - unlike many supervisors that fail below 1.0V. This enables early brownout detection in Li-ion or coin-cell systems where voltage collapse occurs gradually. The MAX6333UR23D3+T continues asserting RESET until VCC rises above 2.30V and sustains the timeout period, even if VCC briefly recovers to 0.8V.
What is the minimum reset timeout period specified for MAX6333UR23D3+T?
The MAX6333UR23D3+T provides a minimum reset timeout period of 100ms, with typical and maximum values of 150ms and 200ms respectively. This ensures sufficient hold time for modern microcontrollers to complete internal PLL lock, memory initialization, and peripheral configuration after power recovery. The timeout is internally generated and fully specified over –40°C to +125°C.
Is MAX6333UR23D3+T pin-compatible with industry-standard reset ICs like MAX809?
Yes, MAX6333UR23D3+T uses the same SOT23-3 pinout (GND–RESET–VCC) and is explicitly stated as pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 families. This allows direct substitution in existing designs without PCB modification, provided the reset threshold (2.30V) and timeout (100ms) meet system requirements. The MAX6333UR23D3+T retains identical mechanical and thermal footprint.
MAX6333UR23D3+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:
- 2.3V
- 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
MAX6333UR23D3+T FAQ
1.How can I place an order for MAX6333UR23D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR23D3+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 MAX6333UR23D3+T reliable?
The price and inventory of MAX6333UR23D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR23D3+T is usually 5 days.
3.What payment methods are accepted for MAX6333UR23D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR23D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6333UR23D3+T?
MAX6333UR23D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR23D3+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 MAX6333UR23D3+T?
For technical support, including MAX6333UR23D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR23D3+T requirements.
6.How does Aetrix verify that MAX6333UR23D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6333UR23D3+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 MAX6333UR23D3+T meets industry standards.
7.What is the process for return or replacement of MAX6333UR23D3+T?
All MAX6333UR23D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR23D3+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 MAX6333UR23D3+T part is unused and in its original packaging.
Return procedure for MAX6333UR23D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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