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Analog Devices Inc./Maxim Integrated MAX809LEUR+T
- Part No.:
- MAX809LEUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809LEUR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,522
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Product details
Overview
MAX809LEUR+T from Maxim Integrated is a 3-pin SOT23 push-pull active-low microprocessor supervisory circuit designed to monitor +5V power supplies and assert a reset signal during power-up, brownout, or voltage drop below 4.63V. It guarantees ≥140ms reset timeout after VCC recovery, draws ≤60µA supply current at +85°C, and operates from -40°C to +105°C - used in automotive ECUs and industrial controllers requiring AEC-Q100-compliant reset assurance.
For engineers reviewing the MAX809LEUR+T datasheet, MAX809LEUR+T pinout, MAX809LEUR+T application, or MAX809LEUR+T equivalent, this page delivers verified reset threshold accuracy (±2.5% over temperature), guaranteed VCC-to-reset delay (<20µs), push-pull output drive capability (3.2mA sink), immunity to sub-100mV/20µs VCC transients, and compatibility with 1V minimum VCC operation - critical for robust μP boot sequencing.
Technical Context
The MAX809LEUR+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its 4.63V nominal reset threshold, holding RESET low for ≥140ms after VCC exceeds the threshold. Its internal timing capacitor ensures monotonic timeout behavior across temperature.
It features a push-pull output stage capable of sinking 3.2mA at VCC = VTH(min), with VOL ≤0.4V, and guarantees valid logic states down to VCC = +1V. The device ignores fast negative-going VCC transients ≤100mV amplitude and ≤20µs duration, eliminating false resets in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over -40°C to +105°C - ensures reliable reset assertion before μP operational voltage margin is violated |
| Reset Timeout Duration | 140ms min (SOT23) - provides sufficient hold time for μP internal initialization and clock stabilization |
| Supply Current | ≤60µA at +85°C - enables use in battery-backed systems without significant standby drain |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout conditions down to 1.2V |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives CMOS/TTL loads directly |
| VCC Transient Immunity | Immune to 100mV/20µs negative glitches - prevents spurious resets in electrically noisy automotive or industrial settings |
| Reset Propagation Delay | <20µs from VCC crossing threshold - ensures rapid response to supply collapse without latency-induced boot failures |
Pinout & Package
MAX809LEUR+T is housed in a 3-pin SOT23 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. Thermal resistance θJA = 250°C/W; derates 4mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and output driver; must be low-impedance connection to system ground plane |
| RESET (Pin 2) | Active-low push-pull reset output | Drives low (≤0.4V @ 3.2mA) during reset; high (≥0.8×VCC) otherwise - directly interfaces μP reset input without external components |
| VCC (Pin 3) | Supply voltage input | Monitored +5V rail; powers internal circuitry and defines reset threshold reference - requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V reset threshold | ±2.5% tolerance over full temperature range ensures deterministic reset timing across automotive and industrial operating envelopes |
| 140ms minimum reset timeout | Guaranteed minimum pulse width eliminates race conditions during μP power-up sequencing and PLL lock acquisition |
| Push-pull active-low output | Eliminates external pullup resistor, reduces BOM count, and provides strong drive into capacitive μP reset pins |
| 1.2V to 5.5V VCC operation | Valid reset assertion down to 1.2V enables fail-safe shutdown detection in deep brownout scenarios |
| AEC-Q100 qualified | Qualified for automotive applications per Grade 2 (-40°C to +105°C) - meets stress test requirements for ECU and ADAS modules |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply during cold cranking, where battery voltage dips to 6–9V causing regulator output sag. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low RESET until 5V rail stabilizes ≥140ms post-recovery. Use Value: Prevents corrupted firmware execution during unstable power transitions, meeting ISO 16750-2 pulse 4 immunity requirements. | Use Scenario: Ensuring deterministic boot of ARM Cortex-M7 controller in modular I/O backplane under variable load and ambient temperature. IC Role / Device Role / Timing Role: Precision voltage monitor with 4.63V threshold and push-pull output directly driving controller reset pin. Use Value: Guarantees reset pulse width ≥140ms independent of PCB trace capacitance or noise coupling - no external RC timing needed. |
| Medical Diagnostic Imaging Subsystem | Railway Signaling Interface Module |
Use Scenario: Power sequencing validation for FPGA-based image processing unit powered from isolated 5V DC/DC converter. IC Role / Device Role / Timing Role: Reset supervisor verifying stable 5V before releasing FPGA configuration reset and enabling clock distribution. Use Value: Eliminates need for discrete comparator + timer circuit; 12µA quiescent current extends battery backup runtime during standby. | Use Scenario: Monitoring 5V logic supply in EN 5012x-compliant signaling interface exposed to rail traction transients. IC Role / Device Role / Timing Role: Immune reset generator rejecting 100mV/20µs VCC glitches induced by nearby relay switching or EMI. Use Value: Prevents false resets during electromagnetic interference events - validated per IEC 61000-4-4 level 3 (2kV EFT). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3123E18DBVR | 4.63V threshold, 200ms timeout, 1.8V–5.5V VCC range, open-drain output | Requires external pullup; longer timeout may delay boot in time-critical systems | Select when longer reset hold time is required and system already uses pullup infrastructure |
| ADM6713LARTZ-REEL7 | 4.63V threshold, 240ms timeout, 1.2V–5.5V VCC, push-pull output, −40°C to +125°C | Higher max temperature rating but larger SOT23-5 footprint and higher quiescent current (120µA) | Select for extended temperature operation beyond +105°C where board space permits SOT23-5 |
Compared with TPS3123E18DBVR and ADM6713LARTZ-REEL7, the MAX809LEUR+T offers optimal balance of AEC-Q100 qualification, minimal 3-pin SOT23 footprint, lowest quiescent current (≤60µA), and precise 140ms timeout - making it preferred for space-constrained automotive and industrial control designs requiring proven reliability and fast boot timing.
Availability
MAX809LEUR+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical diagnostic subsystems requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for MAX809LEUR+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, mixed-signal, and power management ICs for automotive, industrial, communications, and computing markets.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on reset generation in safety-critical embedded systems where voltage monitoring accuracy and glitch immunity are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX809LEUR+T and how tightly is it specified?
The MAX809LEUR+T has a nominal reset threshold of 4.63V, with guaranteed limits of 4.50V (min) to 4.75V (max) over the full operating temperature range of −40°C to +105°C. This ±2.5% tolerance ensures predictable reset behavior across automotive and industrial thermal environments without requiring calibration or trimming.
Does the MAX809LEUR+T require an external pullup resistor on its RESET pin?
No, the MAX809LEUR+T does not require an external pullup resistor because it features a push-pull active-low output stage. The RESET pin actively drives low (≤0.4V at 3.2mA sink) during reset and high (≥0.8×VCC) otherwise - enabling direct connection to μP reset inputs without additional components.
What is the minimum VCC voltage at which the MAX809LEUR+T guarantees valid RESET output logic states?
The MAX809LEUR+T guarantees correct RESET logic states down to VCC = +1.2V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.2V, the output is not guaranteed; however, the device continues asserting RESET until VCC rises above the 4.63V threshold plus hysteresis.
How does the MAX809LEUR+T handle fast voltage transients on the VCC line?
The MAX809LEUR+T is designed to ignore fast negative-going VCC transients up to 100mV amplitude and 20µs duration, as confirmed in its Typical Operating Characteristics graphs. This transient immunity prevents false resets in electrically noisy environments such as automotive power systems or industrial motor drives.
Is the MAX809LEUR+T qualified for automotive applications and what standard does it meet?
Yes, the MAX809LEUR+T is AEC-Q100 qualified per Grade 2 (−40°C to +105°C), as explicitly stated in the Benefits and Features section of its datasheet. This qualification covers stress testing for temperature cycling, humidity, ESD, and mechanical shock - validating its suitability for under-hood automotive modules like ECUs and body controllers.
MAX809LEUR+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX809LEUR+T FAQ
1.How can I place an order for MAX809LEUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809LEUR+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 MAX809LEUR+T reliable?
The price and inventory of MAX809LEUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809LEUR+T is usually 5 days.
3.What payment methods are accepted for MAX809LEUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809LEUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809LEUR+T?
MAX809LEUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809LEUR+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 MAX809LEUR+T?
For technical support, including MAX809LEUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809LEUR+T requirements.
6.How does Aetrix verify that MAX809LEUR+T is sourced from the original manufacturer or authorized distributors?
All MAX809LEUR+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 MAX809LEUR+T meets industry standards.
7.What is the process for return or replacement of MAX809LEUR+T?
All MAX809LEUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809LEUR+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 MAX809LEUR+T part is unused and in its original packaging.
Return procedure for MAX809LEUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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