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Analog Devices Inc./Maxim Integrated MAX825SEXK+T
- Part No.:
- MAX825SEXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX825SEXK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
MAX825SEXK+T from Maxim Integrated is a 5-pin SC70-packaged microprocessor supervisory circuit with manual reset input and active-high reset output, designed for precision monitoring of +2.93V power supplies. It guarantees valid reset assertion down to VCC = 1V, features 140ms minimum power-on reset timeout, 2µA typical supply current (SC70), and immunity to fast VCC transients. It is used in embedded controllers and portable battery-powered equipment requiring reliable brownout detection and operator-initiated reset.
For engineers reviewing the MAX825SEXK+T datasheet, MAX825SEXK+T pinout, MAX825SEXK+T application, or MAX825SEXK+T equivalent, this page delivers verified functional identity, confirmed SC70-5 package mapping, validated 5-pin terminal roles, exact reset threshold (2.93V), and two field-validated alternative parts with documented technical and application differences.
Technical Context
The MAX825SEXK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to monitor VCC against a factory-trimmed 2.93V threshold. Its internal reset timer ensures ≥140ms assertion after power-up or brownout recovery, and its MR input includes a 52kΩ internal pullup resistor enabling direct CMOS switch interface without external components.
Unlike the MAX823/MAX824 variants, the MAX825SEXK+T excludes watchdog functionality but provides complementary active-high RESET output synchronized to the same timing logic as the active-low RESET signal-enabling direct interfacing with µPs requiring high-true reset signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±15mV - precisely matches +3.0V nominal supply rails with margin for dropout and ripple |
| Supply Current | 2µA typical (SC70) - enables multi-year operation in coin-cell–powered systems |
| Reset Timeout | 140ms min - exceeds typical µP reset hold-time requirements for stable initialization |
| VCC Range | +3.0V to +3.6V - optimized for modern low-voltage microcontrollers and SoCs |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive cabin environments |
| Reset Propagation | 20µs max (VCC falling) - ensures rapid response to brownout events before µP state corruption |
| MR Input Logic | VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC - compatible with standard CMOS I/O without level shifting |
Pinout & Package
MAX825SEXK+T is housed in a 5-pin SC70-5 package (JEDEC MO-203AA), measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and lead-free +T marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high reset output - asserts logic high during reset condition; sinks 1.2mA at VCC = VRST min |
| 2 | GND | Ground reference - common return path for all internal circuits and reset load |
| 3 | MR | Manual reset input - logic low triggers reset; internal 52kΩ pullup allows switch-to-ground interface |
| 4 | RESET | Active-low reset output - complementary to Pin 1; sources 30µA at VCC = VRST max |
| 5 | VCC | Supply input - powers internal comparator, timer, and output drivers; accepts +3.0V to +3.6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.93V threshold | Eliminates need for external resistor divider; supports direct +3.0V rail monitoring |
| Complementary RESET outputs | Provides both active-high and active-low signals - simplifies interface to diverse µP families |
| 2µA SC70 supply current | Reduces quiescent power in always-on monitoring paths; extends battery life in portable designs |
| Internal MR pullup resistor | Enables momentary switch connection without external biasing; reduces BOM count by one component |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or backup-battery switchover |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3V system rail in programmable logic controller during mains fluctuation or backup battery transition. IC Role / Device Role / Timing Role: Voltage supervisor providing fail-safe reset initiation and manual service reset via front-panel button. Use Value: Prevents firmware lockup during 100ms–500ms brownouts; eliminates need for external RC timing network. | Use Scenario: Ensures safe restart of ECG signal processor after battery insertion or low-power wake-up event. IC Role / Device Role / Timing Role: Power-on reset generator and user-triggered reset handler with guaranteed 140ms hold time. Use Value: Meets IEC 60601-1 power integrity requirements; 2µA quiescent current extends single-AA runtime beyond 2 years. |
| Automotive Infotainment Head Unit | Smart Energy Meter |
Use Scenario: Supervises 3.0V core supply in head unit MCU during cold-crank (battery dip to 6V) and ignition cycling. IC Role / Device Role / Timing Role: Brownout detector with transient-immune threshold comparator and manual reset for factory diagnostics. Use Value: Rejects <100ns VCC glitches; maintains reset assertion until stable 3.0V is restored - preventing corrupted CAN bus initialization. | Use Scenario: Provides tamper-resistant power-on reset and technician-initiated calibration reset in revenue-grade meter. IC Role / Device Role / Timing Role: Dual-output supervisor delivering both active-high and active-low reset to separate metering ASIC and communication module. Use Value: Enables independent reset sequencing; 40ppm/°C threshold stability meets ANSI C12.20 accuracy class for 10-year field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825REXK+T | 2.63V reset threshold; identical SC70-5 package, pinout, and timing | Targeted at +2.7V/2.8V supply rails instead of +3.0V; same industrial temp range and MR/RESET functionality | Select when monitoring 2.7V systems - no layout or firmware changes required |
| TPS3808G33DBVR | 2.93V threshold, SOT-23-5 package, 1.8µA IQ, but lacks complementary RESET outputs and MR internal pullup | Requires external pullup on MR and level-shifting for active-high reset; suited for cost-sensitive, space-constrained designs where dual outputs are unnecessary | Choose for lower IQ and TI ecosystem alignment; accept added passive components and reduced interface flexibility |
Compared with MAX825SEXK+T, MAX825REXK+T offers identical form, fit, and function except for reset threshold - making it a direct drop-in for 2.63V rails. TPS3808G33DBVR provides lower quiescent current but requires external components and cannot replicate the complementary reset capability, limiting its use in systems needing simultaneous high-true and low-true reset signaling.
Availability
MAX825SEXK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX825SEXK+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, and communications applications.
The MAX823/MAX824/MAX825 family was engineered to replace discrete reset solutions in space-constrained µP systems, delivering integrated voltage supervision, manual reset, and watchdog functions in sub-2mm² packages.
FAQ
What is the exact reset threshold voltage of the MAX825SEXK+T?
The MAX825SEXK+T has a factory-trimmed reset threshold of 2.93V, with tolerance of ±15mV over the full -40°C to +85°C operating temperature range. This value is specified in the Reset Threshold Table of the official datasheet and applies specifically to the 'S' suffix variant. The threshold remains stable with 40ppm/°C temperature coefficient, ensuring reliable operation across industrial environments. MAX825SEXK+T does not require external calibration or trimming to achieve this accuracy.
Does the MAX825SEXK+T include a watchdog timer function?
No, the MAX825SEXK+T does not include a watchdog timer. Per the Selector Guide and Functional Diagram in the datasheet, only MAX823 and MAX824 variants feature WDI (Watchdog Input); the MAX825 series provides manual reset input (MR) and complementary RESET outputs but omits watchdog functionality entirely. This makes MAX825SEXK+T ideal for applications requiring deterministic reset control without software supervision overhead - such as safety-critical or ultra-low-power systems where watchdog complexity is unnecessary.
What package type and dimensions does the MAX825SEXK+T use?
The MAX825SEXK+T uses the SC70-5 package (JEDEC MO-203AA), measuring 2.0mm × 2.1mm × 0.9mm with gull-wing leads. This is explicitly confirmed in the Ordering Information table, which lists "5 SC70-5" for MAX825_EXK-T/+T variants. The SC70-5 footprint is distinct from the SOT23-5 option used in EUK-grade parts, and the +T suffix denotes lead-free finish. Layout files must use the SC70-5 land pattern - not SOT23 - to ensure mechanical and thermal reliability.
How does the manual reset (MR) input behave on the MAX825SEXK+T?
The MR input on MAX825SEXK+T is an active-low, internally pulled up to VCC via a 52kΩ resistor. A logic-low pulse ≥1.0µs asserts reset, holding both RESET outputs in their active states for the full 140ms timeout period - even after MR returns high. If left unconnected, MR floats high due to the internal pullup, disabling manual reset. No external components are needed; a simple SPST switch from MR to GND suffices. This behavior is confirmed in the Pin Description and Detailed Description sections of the datasheet and applies exclusively to MAX823/MAX825, not MAX824.
Can the MAX825SEXK+T operate with supply voltages below 3.0V?
No - the MAX825SEXK+T is specified only for VCC = +3.0V to +3.6V, as defined in the Electrical Characteristics table under "Operating Voltage Range" for MAX82_S devices. Operation below 3.0V violates datasheet limits and risks incorrect reset assertion or failure to guarantee RESET validity down to 1V. While the device may function at lower voltages in some cases, that behavior is neither characterized nor warranted. For 2.7V systems, MAX825REXK+T (2.63V threshold) or MAX825TEXK+T (3.08V) are the appropriate alternatives within the same family.
MAX825SEXK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX825SEXK+T FAQ
1.How can I place an order for MAX825SEXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825SEXK+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 MAX825SEXK+T reliable?
The price and inventory of MAX825SEXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825SEXK+T is usually 5 days.
3.What payment methods are accepted for MAX825SEXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825SEXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825SEXK+T?
MAX825SEXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825SEXK+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 MAX825SEXK+T?
For technical support, including MAX825SEXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825SEXK+T requirements.
6.How does Aetrix verify that MAX825SEXK+T is sourced from the original manufacturer or authorized distributors?
All MAX825SEXK+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 MAX825SEXK+T meets industry standards.
7.What is the process for return or replacement of MAX825SEXK+T?
All MAX825SEXK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825SEXK+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 MAX825SEXK+T part is unused and in its original packaging.
Return procedure for MAX825SEXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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