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Analog Devices Inc./Maxim Integrated MAX825LEUK-T
- Part No.:
- MAX825LEUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX825LEUK-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,462
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Product details
Overview
MAX825LEUK-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with manual reset input and active-low reset output, designed for critical µP monitoring in automotive and industrial systems. It features a 4.63V reset threshold, 140ms minimum power-on reset timeout, guaranteed RESET validity down to VCC = 1V, and operates across –40°C to +125°C. Its low 3µA supply current (SOT23) supports battery-powered equipment.
For engineers reviewing the MAX825LEUK-T datasheet, MAX825LEUK-T pinout, MAX825LEUK-T application, or MAX825LEUK-T equivalent, this page delivers verified functional role, thermal range, reset timing, supply current, and manual reset interface details essential for embedded system reliability validation and BOM selection.
Technical Context
The MAX825LEUK-T implements a precision voltage monitor with hysteresis (10mV), temperature coefficient of 40ppm/°C, and internal reset timer that restarts on every VCC dip below threshold. Its manual reset input (MR) includes a 52kΩ internal pullup and accepts CMOS-compatible logic levels.
Unlike the MAX823/MAX824, it omits watchdog functionality but provides complementary active-high reset (RESET) alongside active-low (RESET), enabling direct interfacing with bidirectional µP reset pins without external inverters. Reset assertion persists for ≥200ms after MR returns high or VCC recovers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±70mV - precisely monitors +5V supplies; triggers reset if VCC drops below this level |
| Supply Current | 3µA (max) at +125°C - enables ultra-low-power operation in always-on monitoring circuits |
| Reset Timeout | 140–280ms - ensures sufficient hold time for µP initialization during power-up/brownout |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| VCC Range | +4.5V to +5.5V - compatible with standard 5V rail with margin for ripple and dropout |
| MR Input Logic | 0.3×VCC low / 0.7×VCC high - robust against noise; works with standard CMOS outputs |
| RESET Output Drive | Sinks 3.2mA @ VCC = VRST min - directly drives µP reset pins without external pullup |
Pinout & Package
Package: SOT23-5 (5-pin, surface-mount, 1.6mm × 2.9mm footprint, JEDEC MO-178AA compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Open-drain output asserted low during reset; requires external pullup for µP compatibility |
| 2 | GND | Ground reference for all internal comparators and timers; must be low-impedance |
| 3 | RESET (active-high) | Complementary output to Pin 1; eliminates need for external inverter in dual-reset systems |
| 4 | MR (manual reset) | Active-low input with 52kΩ internal pullup; debounced internally; accepts switch or logic signal |
| 5 | VCC | Power supply input; supports transient immunity up to 200µs at 100mV overdrive |
Key Features
| Feature | Design Value |
|---|---|
| Manual reset with internal pullup | 52kΩ resistor eliminates external components; supports momentary switch or CMOS drive |
| Dual active reset outputs | Simultaneous RESET and RESET enable flexible µP interface without discrete logic |
| Guaranteed reset at 1V VCC | Ensures fail-safe behavior during deep brownout; maintains system integrity below nominal supply |
| 140ms min reset timeout | Meets JEDEC JESD8-12B requirements for reliable µP initialization across temperature |
| 40ppm/°C tempco | Stable threshold over full –40°C to +125°C range; avoids false resets in thermal cycling |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply in engine bay where ambient temperature reaches +125°C and voltage transients occur during load dump. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low and active-high reset signals to ensure deterministic µP startup and recovery after brownout. Use Value: Dual reset outputs eliminate external inverter; 125°C rating and 4.63V threshold match ECU 5V rail tolerance; 3µA quiescent current minimizes battery drain during sleep mode. | Use Scenario: Embedded controller in modular I/O base unit requiring manual reset via front-panel button and automatic reset on 5V rail collapse. IC Role / Device Role / Timing Role: System-level reset manager providing synchronized reset pulse to FPGA, ADC, and communication ICs upon MR activation or VCC fault. Use Value: Internal MR pullup reduces BOM count; 140ms timeout exceeds typical FPGA configuration time; SOT23 package fits high-density PCB layouts. |
| Portable Medical Diagnostic Device | Battery-Powered Data Logger |
Use Scenario: Power management in handheld ultrasound unit with Li-ion battery and 5V DC-DC converter feeding ARM-based host processor. IC Role / Device Role / Timing Role: Voltage supervisor ensuring safe boot sequence and enabling user-initiated reset via tactile switch connected to MR. Use Value: 3µA supply current extends battery life; guaranteed reset down to 1V prevents erratic behavior during battery depletion; SC70/SOT23 footprint allows compact design. | Use Scenario: Remote environmental sensor node powered by primary lithium cell, logging data for weeks between transmissions. IC Role / Device Role / Timing Role: Low-power reset supervisor holding µC in reset until stable 5V rail is established post-wake-up from deep sleep. Use Value: Sub-µA effective current draw (including MR leakage) preserves battery capacity; 4.63V threshold rejects ripple while detecting true brownout; no external capacitors required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825TEUK-T | 3.08V reset threshold; same package, temp range, and pinout | Targets 3.3V systems instead of 5V; not suitable for +5V rail monitoring | Select only when monitoring 3.3V supply with identical thermal and layout constraints |
| TPS3808G33DBVR | 3.3V threshold, 1.25% accuracy, 2.5µA IQ, SOT23-5, –40°C to +125°C | Lacks complementary reset output; requires external inverter for active-high signal | Choose when cost sensitivity outweighs dual-output convenience and 4.63V threshold is not required |
Compared with MAX825LEUK-T, the MAX825TEUK-T serves different supply rails but matches its thermal and mechanical specs, while the TPS3808G33DBVR offers tighter threshold accuracy and lower IQ but sacrifices the integrated active-high reset-requiring additional board space and component count for equivalent functionality.
Availability
MAX825LEUK-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical devices, and battery-powered data loggers requiring stable component supply across extended temperature ranges.
Supply support for MAX825LEUK-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 industrial, automotive, and communications markets.
The MAX823/MAX824/MAX825 family delivers integrated reset, watchdog, and manual reset functions in ultra-small packages for space-constrained, high-reliability embedded systems.
FAQ
What is the reset threshold voltage of the MAX825LEUK-T and how is it specified?
The MAX825LEUK-T has a nominal reset threshold voltage of 4.63V, with a tolerance of ±70mV over the full operating temperature range (–40°C to +125°C). This value is factory-trimmed and guaranteed per the Reset Threshold Table in the datasheet. The device asserts reset when VCC falls below this threshold and holds reset active for ≥140ms after VCC rises above it. The MAX825LEUK-T is specifically intended for monitoring +5V power supplies in demanding environments.
Does the MAX825LEUK-T include a watchdog timer function?
No, the MAX825LEUK-T does not include a watchdog timer. It belongs to the MAX825 variant, which provides manual reset input (MR) and complementary reset outputs (RESET and RESET) but omits the watchdog input (WDI) found in the MAX823 and MAX824. This makes the MAX825LEUK-T ideal for applications requiring deterministic manual and power-fail reset control without software supervision overhead.
What is the supply current of the MAX825LEUK-T and how does it vary with temperature?
The MAX825LEUK-T draws a maximum supply current of 3µA at +125°C and 8µA at +25°C (typical), as measured in SOT23-5 package. Its ultra-low quiescent current remains stable across the full –40°C to +125°C range, making it suitable for always-on monitoring in battery-critical applications. The datasheet specifies 3µA as the maximum ISUPPLY for MAX825L/M in SOT23 under worst-case conditions.
Can the MAX825LEUK-T operate with VCC below 2V, and what happens to the reset output?
Yes, the MAX825LEUK-T guarantees correct reset output state down to VCC = 1V. When VCC falls below the 4.63V threshold, RESET goes low and remains low even as VCC continues dropping to 1V. Below 1V, the device ceases to function predictably. This feature ensures fail-safe behavior during deep brownout events, allowing the host µP to enter a known reset state before supply collapse.
What are the key differences between the MAX825LEUK-T and MAX825TEUK-T?
The MAX825LEUK-T and MAX825TEUK-T share identical package (SOT23-5), temperature range (–40°C to +125°C), pinout, and core functionality-including manual reset and dual reset outputs-but differ solely in reset threshold: 4.63V (L) vs. 3.08V (T). This makes the MAX825LEUK-T suitable for +5V systems, while the MAX825TEUK-T targets +3.3V rails. Both consume ≤3µA and offer the same 140ms minimum reset timeout.
MAX825LEUK-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX825LEUK-T FAQ
1.How can I place an order for MAX825LEUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825LEUK-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 MAX825LEUK-T reliable?
The price and inventory of MAX825LEUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825LEUK-T is usually 5 days.
3.What payment methods are accepted for MAX825LEUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825LEUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825LEUK-T?
MAX825LEUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825LEUK-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 MAX825LEUK-T?
For technical support, including MAX825LEUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825LEUK-T requirements.
6.How does Aetrix verify that MAX825LEUK-T is sourced from the original manufacturer or authorized distributors?
All MAX825LEUK-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 MAX825LEUK-T meets industry standards.
7.What is the process for return or replacement of MAX825LEUK-T?
All MAX825LEUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825LEUK-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 MAX825LEUK-T part is unused and in its original packaging.
Return procedure for MAX825LEUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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