MAX825ZEXK+T Analog Devices Integrated Circuit (SOT23 (5-Pin)) In Stock
Analog Devices MAX825ZEXK+T is a single-channel microprocessor supervisory circuit in a 5-pin SC-70 package that provides voltage monitoring with manual reset and a watchdog timer function for embedded system reliability. It monitors supply rails with a fixed threshold and asserts reset to ensure correct processor startup and fault recovery. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- SOT23 (5-Pin)
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- MAX825ZEXK+T Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated watchdog timer with manual reset input in a single 5-pin SC-70 package replaces multiple discrete supervisor components in microcontroller power management circuits
- Fixed supply voltage threshold monitoring with no external components required eliminates BOM complexity for standard 3.3 V and 5 V microprocessor reset circuits
- 5-pin SC-70 ultra-compact package measures approximately 2 mm x 1.25 mm, enabling supervisor placement adjacent to the MCU on space-constrained embedded boards
- REACH compliant construction with RoHS-compatible materials supports use in consumer, industrial, and medical embedded systems with current environmental regulations
Applications
The MAX825ZEXK+T is designed to supervise power supply rails and provide reliable reset control for microcontrollers and microprocessors in embedded systems including industrial automation controllers, point-of-sale terminals, and medical monitoring devices. Its integrated watchdog timer detects software lockups and forces a processor reset, improving system robustness in unattended or safety-critical applications. The manual reset input and compact SC-70 footprint make it well-suited for designs requiring a push-button reset alongside automated voltage supervisor functionality on tightly constrained embedded PCBs.
Specifications
| Manufacturer Package Code | 5-SC70-N/A |
| Reach Compliance Code | Compliant |
| Date Of Intro | 1996-03-07 |
| YTEOL | 0 |
| Additional Feature | BAT BUP SW:N;MNL RST:Y;OV DET:N;PW FL IP:N;PW FL IO:N;PW FL OP:N;PRG RST DLY:N;UV DET:N;WD:Y;WWD:N |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-G5 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP5/6,.08 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 0.006mA |
| Supply Voltage-Max (Vsup) | 2.75V |
| Supply Voltage-Min (Vsup) | 2.38V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | YES |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +2.32V |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | SOT23 (5-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Japan, Mainland China, Malaysia, Philippines, Singapore, South Korea, Taiwan, Thailand, USA |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What supervisor functions does the MAX825ZEXK+T integrate and what does the Z suffix signify about its threshold?
The MAX825ZEXK+T integrates voltage monitoring, a watchdog timer (WD: Y), and a manual reset input (MNL RST: Y) in a single 5-pin device. The Z suffix denotes a fixed reset threshold voltage, which sets the supply undervoltage trip point at a factory-programmed level, such as 4.65 V for 5 V systems, eliminating external threshold-setting resistors.
How does the watchdog timer in the MAX825ZEXK+T protect microcontroller-based systems from software lockups?
The MAX825ZEXK+T watchdog timer requires the host microcontroller to toggle the WDI input within a specified timeout window, typically 1.6 seconds. If the WDI pin is not toggled within the window—indicating the processor has stalled or crashed—the watchdog asserts the reset output, restarting the MCU and restoring normal program execution without requiring manual intervention.
What is the package of the MAX825ZEXK+T and how small is its PCB footprint?
The MAX825ZEXK+T is housed in a 5-pin SC-70 package measuring approximately 2.0 mm x 1.25 mm, making it one of the smallest available supervisory IC packages. This compact footprint allows placement within 2 mm to 3 mm of the monitored microcontroller power pins, minimizing trace inductance in the reset line for reliable startup sequencing on dense embedded PCBs.
When is the MAX825ZEXK+T preferred over a more complex supervisor IC with programmable threshold and multiple outputs?
The MAX825ZEXK+T is preferred in single-rail microcontroller designs running at a fixed 3.3 V or 5 V supply where the threshold is known at design time and watchdog plus manual reset are the only required supervisor functions. Adding a programmable threshold supervisor would increase BOM cost by the price of 2 external resistors and require threshold calculation, adding design time without measurable benefit when the supply voltage never changes.
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Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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