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Analog Devices Inc./Maxim Integrated MAX6333UR25D3+T
- Part No.:
- MAX6333UR25D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR25D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,461
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Product details
Overview
MAX6333UR25D3+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 voltage falls below 2.50V (±1.8% at +25°C), maintains reset for ≥100ms after VCC recovers, operates down to 0.7V supply, draws only 3.3µA at 2.5V, and provides glitch-immune power-on/brownout reset for critical μP applications.
For engineers reviewing the MAX6333UR25D3+T datasheet, MAX6333UR25D3+T pinout, MAX6333UR25D3+T application, or MAX6333UR25D3+T equivalent, this page delivers verified electrical parameters, exact SOT23-3 terminal mapping, confirmed reset timeout behavior, factory-trimmed threshold validation, and real-world interface guidance for embedded controllers and battery-powered instrumentation.
Technical Context
The MAX6333UR25D3+T implements a precision bandgap-based reset comparator with factory-trimmed 2.50V threshold (±1.8% at +25°C, ±3% over –40°C to +125°C) and internal RC timing network generating a guaranteed minimum 100ms reset timeout. Its push/pull output drives high-impedance μP reset inputs directly without external pull-up.
It guarantees valid RESET assertion down to VCC = 0.7V and exhibits immunity to fast transients-rejecting negative VCC glitches ≤24µs at 10V/ms slew rate. The device requires no external components and is fully specified across industrial and extended temperature ranges (–40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.50V ±1.8% at +25°C; ensures reliable brownout detection for 2.5V logic rails |
| Reset Timeout Period | ≥100ms (min); holds μP in reset long enough for stable power rail recovery |
| Supply Voltage Range | 0.7V to 5.5V; enables operation during deep brownout and compatibility with 1.8V/2.5V/3.3V systems |
| Supply Current | 3.3µA (typ) at VCC = 2.5V; minimizes battery drain in portable equipment |
| Output Type | Active-low push/pull; drives RESET line directly-no external pull-up required |
| Operating Temperature | –40°C to +125°C; supports automotive under-hood and industrial control environments |
| VCC Falling Propagation Delay | 24µs (max); responds rapidly to supply collapse without false triggering on noise |
Pinout & Package
MAX6333UR25D3+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051), with 1.3mm × 0.8mm footprint and 0.95mm height-optimized for space-constrained 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; sinks current when asserted (VOL ≤ 0.3V @ 500µA), sources current when deasserted (VOH ≥ 0.8×VCC) |
| 3 | VCC | Power supply input (0.7V–5.5V); powers internal comparator, timer, and output driver; also monitored for reset condition |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.50V threshold | Eliminates need for external resistor divider or calibration; meets tight 2.5V rail monitoring spec without design overhead |
| 100ms minimum reset timeout | Ensures μP completes full power-up initialization before release-even after marginal VCC recovery |
| 0.7V minimum operating voltage | Guarantees reset assertion integrity during deep brownout events where other supervisors fail |
| 3.3µA typical supply current | Extends battery life in always-on portable instruments and IoT edge nodes |
| Transient immunity (24µs glitch rejection) | Prevents spurious resets from ESD-induced or switching-noise transients on VCC rail |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers operating in harsh factory environments with fluctuating 24V DC-DC derived 3.3V rails. IC Role / Device Role / Timing Role: Monitors 3.3V logic supply and asserts active-low RESET to ARM Cortex-M7 μP during brownout, holding reset ≥100ms until rail stabilizes. Use Value: Prevents firmware corruption by ensuring μP remains held in reset until power rail settles-critical for deterministic I/O state recovery. |
Use Scenario: Remote environmental sensors powered by coin-cell batteries, sampling temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Supervises 1.8V LDO output powering ultra-low-power MCU; asserts RESET if battery voltage sags below 1.8V × 0.95 = ~1.71V. Use Value: Enables reliable cold-start and brownout recovery with only 3.3µA quiescent draw-extending operational lifetime beyond 5 years on CR2032. |
| Medical Point-of-Care Devices | Automotive Body Control Modules |
Use Scenario: Handheld glucose meters requiring FDA-grade reliability and zero firmware corruption risk during battery replacement. IC Role / Device Role / Timing Role: Provides fail-safe reset supervision of 2.5V analog front-end and BLE SoC; uses 2.50V threshold to match ADC reference stability window. Use Value: Factory-trimmed ±1.8% threshold eliminates post-assembly calibration; 100ms timeout prevents premature wake-up before analog biasing completes. |
Use Scenario: Under-dash BCMs exposed to wide temperature swings (–40°C to +125°C) and load-dump transients. IC Role / Device Role / Timing Role: Monitors 3.3V domain supplying CAN transceiver and microcontroller; asserts RESET during ignition cycling or alternator ripple events. Use Value: Valid operation down to 0.7V and transient immunity ensure robust reset behavior even during severe VCC sag-meeting ISO 16750-2 pulse 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT25D3+T | Same SOT23-3 package, identical 2.50V threshold and 100ms timeout, but rated only to +85°C (not +125°C) | Limited to commercial-temperature consumer electronics-not suitable for under-hood or industrial ambient | Select MAX6333UR25D3+T when extended temperature range (–40°C to +125°C) or automotive qualification is required. |
| TPS3125M25DBVR | TI part with 2.5V threshold and 200ms timeout; higher 8µA ICC; open-drain output requiring external pull-up | Requires additional 10kΩ pull-up resistor and occupies more board area due to larger SOT23-5 footprint | Choose MAX6333UR25D3+T for lower quiescent current, push/pull simplicity, and smaller 3-pin footprint in space-critical designs. |
Compared with MAX6327UT25D3+T and TPS3125M25DBVR, the MAX6333UR25D3+T delivers superior thermal robustness, lowest supply current, and true plug-and-play reset drive-making it optimal for high-reliability embedded systems where layout area, power budget, and ambient extremes are critical constraints.
Availability
MAX6333UR25D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical point-of-care devices, and automotive body control modules requiring stable component supply and guaranteed long-term availability.
Supply support for MAX6333UR25D3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX633x family was engineered specifically for ultra-low-voltage, low-power microprocessor reset supervision-targeting space-constrained, battery-sensitive, and thermally demanding embedded systems where reliability cannot be compromised.
FAQ
What is the exact reset threshold voltage of MAX6333UR25D3+T and how tightly is it specified?
The MAX6333UR25D3+T features a factory-trimmed reset threshold of 2.50V, with a tolerance of ±1.8% at +25°C and ±3% over the full –40°C to +125°C operating range. This precision eliminates the need for external calibration and ensures consistent brownout detection across temperature for 2.5V logic domains. The value is laser-trimmed during production and documented in Table 1 of the official datasheet.
Does MAX6333UR25D3+T require any external components to function as a reset supervisor?
No, the MAX6333UR25D3+T operates autonomously with no external components required. Its push/pull active-low RESET output drives microprocessor reset pins directly-no pull-up resistor is needed. The internal reset comparator, timing capacitor, and output driver are fully integrated, reducing BOM count and PCB area versus discrete or adjustable solutions.
What is the minimum supply voltage at which MAX6333UR25D3+T guarantees correct reset assertion?
The MAX6333UR25D3+T guarantees correct RESET assertion down to VCC = 0.7V across the full –40°C to +125°C temperature range. This ultra-low operating voltage ensures reliable brownout detection even during deep power sags where competing supervisors lose functionality-critical for fail-safe operation in safety-critical systems.
How does MAX6333UR25D3+T handle fast transients on the VCC line?
The MAX6333UR25D3+T incorporates transient-immune design: its reset comparator rejects negative-going VCC glitches up to 24µs duration when slewing at 10V/ms. This is validated in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph in the datasheet. As overdrive increases, allowable glitch width decreases-preventing false resets from ESD or switching noise.
Is MAX6333UR25D3+T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, the MAX6333UR25D3+T is explicitly stated as pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the datasheet's Benefits and Features section. All share identical SOT23-3 pinout (GND, RESET, VCC), enabling drop-in replacement in existing designs-provided the 2.50V threshold and 100ms timeout meet system requirements.
MAX6333UR25D3+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:
- 2.5V
- 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
MAX6333UR25D3+T FAQ
1.How can I place an order for MAX6333UR25D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR25D3+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 MAX6333UR25D3+T reliable?
The price and inventory of MAX6333UR25D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR25D3+T is usually 5 days.
3.What payment methods are accepted for MAX6333UR25D3+T?
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4.How is shipping managed for MAX6333UR25D3+T?
MAX6333UR25D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR25D3+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 MAX6333UR25D3+T?
For technical support, including MAX6333UR25D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR25D3+T requirements.
6.How does Aetrix verify that MAX6333UR25D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6333UR25D3+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 MAX6333UR25D3+T meets industry standards.
7.What is the process for return or replacement of MAX6333UR25D3+T?
All MAX6333UR25D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR25D3+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 MAX6333UR25D3+T part is unused and in its original packaging.
Return procedure for MAX6333UR25D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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