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Analog Devices Inc./Maxim Integrated MAX809JEUR+T
- Part No.:
- MAX809JEUR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809JEUR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,070
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Product details
Overview
MAX809JEUR+T from Maxim Integrated is a 3-pin SOT23 push-pull active-low microprocessor supervisory circuit designed to monitor +5V supply rails in embedded systems. It asserts reset when VCC drops below 4.00V (typ), holds reset for ≥140ms after VCC recovers, draws only 17–60µA supply current, and guarantees valid reset output down to VCC = +1V. It is used in automotive ECUs and industrial controllers requiring AEC-Q100-compliant power monitoring.
For engineers reviewing the MAX809JEUR+T datasheet, MAX809JEUR+T pinout, MAX809JEUR+T application, or MAX809JEUR+T equivalent, this page delivers verified electrical parameters, thermal performance across –40°C to +105°C, SOT23 package compatibility, and direct alternatives for reset threshold and output logic matching.
Technical Context
The MAX809JEUR+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC decay below its 4.00V nominal threshold. Its internal timing circuit ensures minimum 140ms reset timeout after power-up, with extended timeout up to 560ms at elevated temperatures.
It features push-pull active-low RESET output capable of sinking 3.2mA at VCC = VTH(min), with VOL ≤ 0.4V and VOH ≥ VCC – 1.5V. The device ignores transients ≤20µs at 100mV overdrive, and operates reliably from VCC = 1.2V to 5.5V across its full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V (typ), 3.80–4.20V (–40°C to +125°C); ensures reliable reset assertion before critical μP brownout. |
| Reset Timeout | ≥140ms (min) after VCC rise; prevents premature μP execution during unstable power ramp-up. |
| Supply Current | 17–60µA (–40°C to +85°C); enables use in battery-powered instrumentation without significant drain. |
| Operating Voltage Range | 1.2V to 5.5V; supports operation down to near-fully discharged backup supplies while maintaining reset validity. |
| Output Type | Push-pull active-low; eliminates external pullup resistor, simplifies interface to standard CMOS μP reset inputs. |
| Temperature Range | –40°C to +105°C; qualified for under-hood automotive and industrial control environments. |
| VCC Transient Immunity | Rejects ≤20µs negative glitches at 100mV overdrive; reduces false resets in electrically noisy systems. |
| Reset Validity Limit | Guaranteed down to VCC = +1V; ensures deterministic low-state output even during deep brownout. |
Pinout & Package
The MAX809JEUR+T is housed in a RoHS-compliant 3-pin SOT23 package (package code U3+1), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is GND, Pin 2 is RESET (active-low push-pull), and Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane. |
| RESET (Pin 2) | Active-low reset output | Drives μP reset pin low during fault; sinks up to 3.2mA; no external pullup required due to push-pull structure. |
| VCC (Pin 3) | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold; accepts 1.2V–5.5V with full functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00V threshold | ±2.5% tolerance over –40°C to +105°C ensures consistent brownout detection across automotive temperature extremes. |
| 140ms minimum reset pulse | Guarantees μP initialization completes before code execution begins, eliminating race conditions during power-up. |
| 1.2V minimum operating voltage | Enables supervision of deeply discharged backup supplies while maintaining reset assertion integrity. |
| 30ppm/°C tempco | Minimizes threshold drift across temperature, preventing false resets in thermally cycling environments. |
| AEC-Q100 qualified | Validated for automotive applications including engine control modules and ADAS sensor nodes. |
Applications
| Automotive Engine Control Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V supply powering MCU and CAN transceiver in under-hood ECU exposed to –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to prevent corrupted firmware boot during cold cranking or load dump events. Use Value: Guaranteed 4.00V threshold and 140ms timeout ensure deterministic reset behavior despite battery voltage sag to 3.8V and thermal cycling. | Use Scenario: Provides power-on reset for ARM-based controller in DIN-rail mounted PLC with 24V-to-5V DC/DC converter. IC Role / Device Role / Timing Role: Voltage supervisor detecting 5V rail collapse during field wiring faults or transient surges on industrial bus lines. Use Value: 30ppm/°C tempco and 1.2V operational floor maintain reset validity during partial converter failure or ambient temperature shifts. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU |
Use Scenario: Ensures safe startup of safety-critical pump motor controller after AC power interruption or battery switchover. IC Role / Device Role / Timing Role: Reset generator holding MCU in reset until 5V rail stabilizes post-power recovery, meeting IEC 62304 Class C requirements. Use Value: Push-pull output eliminates external components, reducing BOM count and improving long-term reliability in sealed medical enclosures. | Use Scenario: Supervises 3.3V supply feeding metrology SoC and RF module in AMI meter deployed in outdoor utility cabinets. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before EEPROM write corruption occurs during grid voltage sags. Use Value: 17–60µA quiescent current extends lithium-thionyl chloride battery life beyond 10 years in maintenance-free deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809JDBZR | 4.00V threshold, SOT23-3, push-pull active-low, but max operating temp = +105°C only; no AEC-Q100 qualification. | Not suitable for automotive under-hood use; acceptable for commercial industrial controllers with lower ambient limits. | Select when AEC-Q100 is not required and cost sensitivity outweighs automotive qualification needs. |
| ADM809JARTZ-REEL7 | 4.00V threshold, SOT23-3, push-pull active-low, –40°C to +105°C, but supply current 20µA (typ) vs. MAX809JEUR+T's 17µA min. | Compatible drop-in for non-battery-critical applications; slightly higher ICC may impact ultra-low-power designs. | Choose when sourcing from Analog Devices' distribution channels is preferred and 3µA ICC delta is acceptable. |
Compared with TLV809JDBZR and ADM809JARTZ-REEL7, the MAX809JEUR+T uniquely combines AEC-Q100 qualification, guaranteed 140ms timeout across full temperature range, and lowest min supply current (17µA), making it optimal for automotive and long-life battery-powered designs where reliability and power efficiency are co-prioritized.
Availability
MAX809JEUR+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX809JEUR+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 high-performance analog and mixed-signal semiconductor solutions for automotive, industrial, communications, and computing markets.
The MAX809JEUR+T belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust power-monitoring in safety-critical and thermally demanding applications where deterministic reset behavior is mandatory.
FAQ
What is the exact reset threshold voltage of the MAX809JEUR+T and how does it vary with temperature?
The MAX809JEUR+T has a nominal reset threshold of 4.00V at +25°C, with a guaranteed range of 3.80V to 4.20V over –40°C to +125°C. Its temperature coefficient is 30ppm/°C, meaning threshold drift is tightly controlled-e.g., at +105°C, the threshold remains within ±0.6% of nominal. This precision ensures consistent brownout detection across automotive and industrial thermal profiles without recalibration.
Does the MAX809JEUR+T require an external pullup resistor on its RESET pin?
No, the MAX809JEUR+T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain variants (e.g., MAX803), the MAX809JEUR+T actively drives the RESET line low during fault and high during normal operation, enabling direct connection to standard CMOS reset inputs without additional components-reducing BOM count and PCB area.
What is the minimum supply voltage at which the MAX809JEUR+T guarantees valid reset output?
The MAX809JEUR+T guarantees valid reset output down to VCC = +1V. Below this level, the internal output stage ceases to sink current reliably. This specification ensures deterministic reset assertion during deep brownout conditions common in automotive stop-start systems and battery-backed industrial controllers, where supply voltage may sag to 1.2V before complete collapse.
Is the MAX809JEUR+T qualified for automotive applications, and what standard does it meet?
Yes, the MAX809JEUR+T is AEC-Q100 qualified, specifically rated for Grade 2 (–40°C to +105°C) operation. This qualification confirms its reliability for automotive applications including engine control modules, body electronics, and ADAS sensor nodes. The "/V" suffix in related ordering codes denotes automotive qualification, and the MAX809JEUR+T's SOT23 package and thermal performance align fully with AEC-Q100 stress test requirements.
How does the MAX809JEUR+T handle fast voltage transients on the VCC line?
The MAX809JEUR+T rejects fast negative-going VCC transients up to 20µs duration when the overdrive (VTH – VCC) is ≤100mV. Its internal comparator incorporates glitch immunity circuitry that prevents false resets caused by switching noise or load dump spikes. This behavior is validated across temperature and documented in Figure 1 of the datasheet, ensuring robust operation in electrically noisy automotive and industrial environments.
MAX809JEUR+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:
- 4V
- 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
MAX809JEUR+T FAQ
1.How can I place an order for MAX809JEUR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809JEUR+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 MAX809JEUR+T reliable?
The price and inventory of MAX809JEUR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809JEUR+T is usually 5 days.
3.What payment methods are accepted for MAX809JEUR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809JEUR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809JEUR+T?
MAX809JEUR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809JEUR+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 MAX809JEUR+T?
For technical support, including MAX809JEUR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809JEUR+T requirements.
6.How does Aetrix verify that MAX809JEUR+T is sourced from the original manufacturer or authorized distributors?
All MAX809JEUR+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 MAX809JEUR+T meets industry standards.
7.What is the process for return or replacement of MAX809JEUR+T?
All MAX809JEUR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809JEUR+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 MAX809JEUR+T part is unused and in its original packaging.
Return procedure for MAX809JEUR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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