My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX823SEUK+T
- Part No.:
- MAX823SEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823SEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,272
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX823SEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low reset, watchdog timer (1.6s timeout), and manual reset input, designed for +2.93V supply monitoring in industrial and automotive systems operating from -40°C to +125°C. It guarantees RESET validity down to VCC = 1V, features 140ms min power-on reset, and provides immunity to fast VCC transients.
For engineers reviewing the MAX823SEUK+T datasheet, MAX823SEUK+T pinout, MAX823SEUK+T application, or MAX823SEUK+T equivalent, key selection criteria include reset threshold accuracy (2.93V ±15mV), watchdog timeout stability over temperature, manual reset pulse handling (1µs minimum), internal MR pullup (52kΩ), and compatibility with bidirectional µP reset pins requiring ≤400µA sink current.
Technical Context
The MAX823SEUK+T integrates a precision voltage comparator, 140–280ms reset timeout timer, and 1.12–2.40s watchdog timer with edge-sensitive WDI detection (50ns pulse width support). Its reset generator asserts active-low RESET whenever VCC falls below 2.93V, during MR assertion, or upon watchdog timeout - with guaranteed low-state hold until VCC exceeds threshold plus timeout period.
It uses BiCMOS process technology (607 transistors) and features internal 52kΩ MR pullup, 5mV reset hysteresis, and 40ppm/°C temperature coefficient on reset threshold. The device operates with supply current as low as 3µA (SOT23) and supports VCC ranges from +3.0V to +3.6V for the 'S' variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±15mV at +25°C; ensures reliable brownout detection for +3.3V systems with margin |
| Reset Timeout Period | 140–280ms; holds µP in reset long enough for stable clock and supply settling |
| Watchdog Timeout | 1.12–2.40s; detects software hangs without requiring external timing components |
| Supply Current | 3µA (max) at +125°C; enables ultra-low-power operation in battery-backed systems |
| MR Pulse Width | 1.0µs minimum; supports fast digital logic or debounced switch inputs without external filtering |
| VCC Range | +3.0V to +3.6V; matches nominal +3.3V rail with 10% tolerance for robust operation |
| Operating Temp | -40°C to +125°C; qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX823SEUK+T is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Drives µP reset pin low for ≥200ms after VCC rise, MR release, or watchdog timeout; sinks 1.2mA @ VCC = 3.0V |
| 2 - GND | Ground reference | Common return path for all internal circuits; requires low-impedance PCB connection to minimize noise coupling |
| 3 - WDI | Watchdog input | Edge-triggered input; rising/falling edges clear 1.6s timer; left open disables watchdog function |
| 4 - MR | Manual reset input | Active-low input with internal 52kΩ pullup; asserts reset when pulled ≤0.9V (VCC = 3.0V); no external resistor needed |
| 5 - VCC | Power supply input | Accepts +3.0V to +3.6V; includes internal transient filtering; bypass capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET valid to VCC = 1V | Ensures fail-safe reset assertion even during deep brownout or backup-battery switchover |
| No external components required | Eliminates BOM cost and layout area for RC timing networks, pullups, or discrete comparators |
| Power-supply transient immunity | Rejects negative VCC glitches <100ns wide at 2.93V overdrive, preventing spurious resets |
| 140ms min power-on reset | Meets JEDEC JESD22-B103B reliability requirement for minimum reset assertion time |
| Watchdog with 1.6s timeout | Provides deterministic software hang detection without firmware timer overhead or calibration |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Real-time control of solenoids, sensors, and communication buses in factory automation cabinets exposed to EMI and thermal cycling. IC Role / Device Role / Timing Role: Supervises +3.3V main logic supply and triggers hardware reset if firmware locks up or supply dips during motor switching. Use Value: Prevents undetected state corruption by asserting reset within 200ms of VCC drop below 2.93V, with watchdog recovery independent of software execution. | Use Scenario: Centralized control unit managing door locks, lighting, and CAN gateway functions in passenger vehicles. IC Role / Device Role / Timing Role: Monitors battery-backed +3.3V domain and initiates safe shutdown/reset during cold-cranking voltage sag or ESD-induced MCU lockup. Use Value: Guarantees RESET remains asserted down to VCC = 1V, enabling controlled state save before power loss - critical for nonvolatile memory integrity. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-powered vital-sign recorder with low-power sleep modes and intermittent sensor sampling. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via tactile button while minimizing quiescent current draw (<3µA). Use Value: Enables >5-year battery life in standby; MR's internal 52kΩ pullup eliminates external component, reducing PCB size and leakage paths. | Use Scenario: DIN-rail mounted meter with isolated RS-485, metrology ASIC, and tamper-detection circuitry. IC Role / Device Role / Timing Role: Supervises isolated +3.3V auxiliary supply and validates firmware integrity via periodic WDI toggling during metrology processing cycles. Use Value: Detects stuck firmware loops within 2.4s (max watchdog timeout), ensuring accurate energy accumulation resumes after reset without data loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TEUK+T | Reset threshold 3.08V; 3µA supply current same; identical pinout and temp range | Suitable for +3.3V systems with tighter upper supply margin (e.g., LDO-regulated rails) | Select when system VCC nominal is 3.3V but may reach 3.4V; avoids premature reset assertion vs. 2.93V variant |
| TPS3808G33DBVR | 3.3V fixed threshold; 1.8µA typical IQ; 200ms reset timeout; no watchdog or MR input | Lacks watchdog and manual reset - limited to basic power-monitoring use cases | Choose only if watchdog and MR are unnecessary and lowest possible quiescent current is mandatory |
Compared with MAX823SEUK+T, MAX823TEUK+T offers higher reset threshold for improved noise margin on clean +3.3V rails, while TPS3808G33DBVR reduces supply current but sacrifices watchdog and manual reset functionality - making it unsuitable for safety-critical or field-serviceable designs.
Availability
MAX823SEUK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823SEUK+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX823 family was designed specifically for robust microprocessor supervision in harsh environments, integrating reset, watchdog, and manual reset in minimal footprint to replace discrete solutions and improve system-level reliability.
FAQ
What is the exact reset threshold voltage of MAX823SEUK+T and how tightly is it specified?
The MAX823SEUK+T has a nominal reset threshold of 2.93V, with a guaranteed tolerance of ±15mV at +25°C and full specification over temperature (-40°C to +125°C). This corresponds to the 'S' suffix in the ordering code and is validated per the Reset Threshold Table in the official datasheet. The device maintains this accuracy with 40ppm/°C temperature coefficient, ensuring predictable brownout behavior across its entire operating range. MAX823SEUK+T is therefore suited for precise +3.3V supply monitoring where 2.93V provides optimal margin above typical LDO dropout.
Does MAX823SEUK+T include both watchdog and manual reset functionality?
Yes, MAX823SEUK+T integrates both watchdog timer and manual reset input as core features. It provides a 1.12–2.40s watchdog timeout with edge-sensitive WDI pin (50ns minimum pulse width), and an active-low MR input with internal 52kΩ pullup resistor. These functions operate independently: MR assertion forces immediate reset, while watchdog timeout triggers reset if software fails to toggle WDI. MAX823SEUK+T is one of only two variants in the MAX823/MAX824/MAX825 family offering both features - the other being MAX823 with different suffixes.
What is the maximum supply current consumption of MAX823SEUK+T across temperature?
The MAX823SEUK+T specifies a maximum supply current of 3µA at +125°C and 8µA at +25°C (SOT23 package), per the Electrical Characteristics table. This ultra-low quiescent current enables multi-year battery operation in portable equipment. The value is measured with MR and WDI unconnected, and applies to the 'S' threshold variant in SOT23-5 packaging. MAX823SEUK+T achieves this while maintaining full functionality - including guaranteed RESET assertion down to VCC = 1V and 140ms minimum reset timeout - unlike lower-IQ alternatives that omit watchdog or MR.
Can MAX823SEUK+T drive a microcontroller with a bidirectional reset pin?
Yes, MAX823SEUK+T can interface directly with µPs having bidirectional reset pins (e.g., 68HC11), thanks to its RESET output's ability to both source and sink current. Specifically, it sources up to 150µA (VOH ≥ 0.8×VCC) and sinks up to 1.2mA (VOL ≤ 0.3V at VCC = 3.0V). This allows the µP to override the supervisor's reset signal when needed - for example, to force a reset during debug or recovery sequences. MAX823SEUK+T's 400µA max short-circuit current rating ensures safe operation when the µP pulls RESET low against the supervisor's pullup.
Is MAX823SEUK+T compatible with +3.3V systems that experience fast VCC transients?
Yes, MAX823SEUK+T is explicitly designed for immunity to fast VCC transients. Its internal architecture ignores negative-going glitches shorter than ~100ns when the overdrive (VRST – VCC) is ≥100mV, as shown in the Typical Operating Characteristics graph "Maximum VCC Transient Duration vs. Reset Threshold Overdrive". This makes MAX823SEUK+T suitable for noisy environments like motor drives or automotive loads, where brief supply dips would otherwise cause spurious resets. Adding a 0.1µF ceramic capacitor close to the VCC pin further enhances this immunity.
MAX823SEUK+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:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- 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
MAX823SEUK+T FAQ
1.How can I place an order for MAX823SEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823SEUK+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 MAX823SEUK+T reliable?
The price and inventory of MAX823SEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823SEUK+T is usually 5 days.
3.What payment methods are accepted for MAX823SEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823SEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823SEUK+T?
MAX823SEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823SEUK+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 MAX823SEUK+T?
For technical support, including MAX823SEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823SEUK+T requirements.
6.How does Aetrix verify that MAX823SEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX823SEUK+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 MAX823SEUK+T meets industry standards.
7.What is the process for return or replacement of MAX823SEUK+T?
All MAX823SEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX823SEUK+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 MAX823SEUK+T part is unused and in its original packaging.
Return procedure for MAX823SEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX823SEUK+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
