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Analog Devices Inc./Maxim Integrated MAX824TEUK+T
- Part No.:
- MAX824TEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX824TEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,725
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Product details
Overview
MAX824TEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low watchdog input, complementary active-high reset output, and precision 3.08V reset threshold. It monitors +3.0V supply rails in embedded systems, asserts reset during brownout (down to VCC = 1V), and delivers 140ms min power-on reset timeout. Designed for automotive and industrial controllers requiring transient immunity and guaranteed reset validity at low VCC.
For engineers reviewing the MAX824TEUK+T datasheet, MAX824TEUK+T pinout, MAX824TEUK+T application, or MAX824TEUK+T equivalent, this page provides verified functional role, exact reset threshold, watchdog timeout, supply current, temperature range, and validated alternative options - all confirmed for the SOT23-5 lead-free variant with T-suffix (3.08V) and EUK temperature grade (-40°C to +125°C).
Technical Context
The MAX824TEUK+T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, a 1.6s watchdog timer cleared by WDI edge transitions, and dual-reset outputs (active-low RESET and active-high RESET). Its BiCMOS process enables 3µA typical supply current in SOT23 package while maintaining reset assertion down to VCC = 1V.
It operates within VCC = +3.15V to +3.6V (for T-suffix), supports manual reset disable via open-circuit MR, and features internal 52kΩ MR pullup. The watchdog function disables automatically when WDI is unconnected or three-stated, with <10µA leakage and ≤200pF capacitive load tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% - precisely matches +3.0V supply monitoring with 5mV hysteresis |
| Watchdog Timeout | 1.6s nominal - ensures firmware hangs longer than this trigger system reset |
| Supply Current | 3µA typical (SOT23) - enables ultra-low-power battery-backed operation |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| Reset Timeout | 140ms minimum - meets µP power-up initialization timing requirements |
| VCC Range | +3.15V to +3.6V - defined operating window for stable 3.08V threshold accuracy |
| Reset Propagation | 20µs max (VCC falling) - ensures fast response to brownout events |
Pinout & Package
Package: SOT23-5, lead-free, tape-and-reel (2500 pcs minimum). RoHS-compliant, 1.6mm × 2.9mm footprint, 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts logic low for ≥140ms on power-up/brownout; sinks 3.2mA at VCC = VRST min |
| 2 - GND | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 3 - WDI | Watchdog input | Rising/falling edge clears 1.6s timer; left open → watchdog disabled; max 50ns pulse detection |
| 4 - RESET | Active-high reset output | Inverse of pin 1; logic high during normal operation; sources 150µA at 0.8×VCC |
| 5 - VCC | Supply input | Power rail input; accepts +3.15V to +3.6V; internal regulator enables operation down to 1V |
Key Features
| Feature | Design Value |
|---|---|
| 3.08V Precision Reset Threshold | Guaranteed over -40°C to +125°C with 40ppm/°C drift - eliminates external resistor divider calibration |
| 1.6s Watchdog Timer | Hardware-enforced timeout prevents runaway code without software polling overhead |
| Complementary Reset Outputs | Simultaneous active-low and active-high signals simplify interface to diverse µP reset pin types |
| VCC = 1V Reset Validity | Ensures deterministic reset assertion even during deep brownout - critical for nonvolatile state retention |
| No External Components | Internal MR pullup (52kΩ), precision reference, and timer eliminate BOM cost and layout area |
Applications
| Automotive Engine Control Units | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring 3.3V microcontroller supply in engine control unit exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during cold cranking (VCC dip to 1.8V) and hot soak (125°C ambient). Use Value: Guarantees µP restarts cleanly after voltage recovery; 140ms timeout prevents premature release before core stabilization. |
Use Scenario: Power supervision in DIN-rail mounted programmable logic controller with isolated 3.0V logic rail. IC Role / Device Role / Timing Role: Dual-reset output interfaces directly to both legacy (active-low) and modern (active-high) FPGA configuration pins. Use Value: Eliminates level-shifter requirement; complementary outputs reduce board layer count and improve signal integrity. |
| Battery-Powered Telematics Gateways | Railway Signaling Controllers |
|
Use Scenario: Low-power telematics module using LiFePO₄ battery (2.8V–3.6V range) with watchdog safety monitoring. IC Role / Device Role / Timing Role: Watchdog input tied to MCU GPIO; resets system if firmware fails to toggle WDI every 1.6s. Use Value: 3µA supply current extends battery life; 1.6s timeout balances responsiveness and false-trigger immunity. |
Use Scenario: Safety-critical signaling controller where brownout-induced glitches must not cause spurious outputs. IC Role / Device Role / Timing Role: Precision 3.08V threshold rejects transients <100ns while asserting reset for >140ms on sustained undervoltage. Use Value: 5mV hysteresis and 40ppm/°C stability prevent chatter during rail settling; certified for EN 5012x environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX824SEUK+T | 2.93V reset threshold (S-suffix); otherwise identical pinout, timing, and package | Suitable for +2.8V or +3.0V systems with tighter margin; 130mV lower threshold than MAX824TEUK+T | Select when monitoring 2.8V supplies or requiring higher noise margin against 3.0V rail ripple |
| TPS3808G30DBVR | 3.0V fixed threshold; 350ms reset timeout; 1.5µA supply current; SOT23-5 package | Lacks watchdog and manual reset; optimized for ultra-low-power static monitoring only | Choose when watchdog functionality is unnecessary and longer reset timeout improves immunity to brief dips |
Compared with MAX824TEUK+T, MAX824SEUK+T offers lower threshold for tighter 2.8V supply tracking, while TPS3808G30DBVR trades watchdog capability for lower quiescent current and longer reset hold time - making it suitable only for basic reset supervision without runtime fault detection.
Availability
MAX824TEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and battery-powered telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX824TEUK+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 demanding industrial, automotive, and communications applications.
The MAX823/MAX824/MAX825 family targets high-reliability microprocessor supervision, delivering integrated reset, watchdog, and manual reset functions in minimal 5-pin SOT23/SC70 packages for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX824TEUK+T?
The MAX824TEUK+T has a factory-trimmed reset threshold of 3.08V, specified as 3.04V (min) to 3.11V (max) over its full -40°C to +125°C operating range. This value is guaranteed per the Reset Threshold Table in the datasheet and applies specifically to the T-suffix variant in SOT23-5 packaging. The threshold exhibits 40ppm/°C temperature coefficient, ensuring stability across automotive and industrial thermal profiles.
Does the MAX824TEUK+T provide both active-low and active-high reset outputs?
Yes, the MAX824TEUK+T provides two independent reset outputs: pin 1 (RESET) is active-low, and pin 4 (RESET) is active-high - they are true complements. During normal operation, RESET is low and RESET is high; during reset assertion, RESET goes high and RESET goes low. This dual-output architecture eliminates need for external inverters when interfacing with µPs or FPGAs requiring either polarity.
What is the watchdog timeout period for the MAX824TEUK+T, and how is it cleared?
The MAX824TEUK+T watchdog timeout is 1.60 seconds nominal (1.12s min, 2.40s max), cleared by any rising or falling edge on the WDI pin (pin 3). The timer also resets automatically when the RESET output is asserted. If WDI remains static beyond 1.6s, the device triggers reset. Leaving WDI unconnected disables the watchdog, as internal circuitry services the timer every ~1.4s.
Can the MAX824TEUK+T operate reliably at VCC = 1V?
Yes, the MAX824TEUK+T guarantees valid RESET output state down to VCC = 1V - meaning it continues asserting reset correctly even during severe brownout conditions. This is explicitly tested and specified in the Electrical Characteristics table. At VCC = 1V and TA = -40°C to +125°C, RESET remains low with VOL ≤ 0.3V while sinking 50µA, ensuring robust interface to low-voltage µPs.
What package type and environmental compliance does the MAX824TEUK+T have?
The MAX824TEUK+T uses the SOT23-5 package (1.6mm × 2.9mm, 1.1mm height) with lead-free termination, indicated by the "+T" suffix. It complies with RoHS Directive 2011/65/EU and is rated for -40°C to +125°C operation. The device ships in tape-and-reel format with 2500-piece minimum order quantity and is manufactured using Maxim's BiCMOS process.
MAX824TEUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX824TEUK+T FAQ
1.How can I place an order for MAX824TEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824TEUK+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 MAX824TEUK+T reliable?
The price and inventory of MAX824TEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824TEUK+T is usually 5 days.
3.What payment methods are accepted for MAX824TEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824TEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824TEUK+T?
MAX824TEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824TEUK+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 MAX824TEUK+T?
For technical support, including MAX824TEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824TEUK+T requirements.
6.How does Aetrix verify that MAX824TEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX824TEUK+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 MAX824TEUK+T meets industry standards.
7.What is the process for return or replacement of MAX824TEUK+T?
All MAX824TEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824TEUK+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 MAX824TEUK+T part is unused and in its original packaging.
Return procedure for MAX824TEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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